using System.Security.Cryptography;
using System.Text;
using System.Text.RegularExpressions;
using JobsMedical.Web.Data;
using JobsMedical.Web.Models;
using Microsoft.EntityFrameworkCore;

namespace JobsMedical.Web.Services.Scraping;

public record SourceResult(string Source, int Fetched, int Queued, int Published, int Flagged, int Spam, int Duplicates);

public record IngestionSummary(List<SourceResult> Sources)
{
    public int TotalFetched => Sources.Sum(s => s.Fetched);
    public int TotalQueued => Sources.Sum(s => s.Queued);
    public int TotalPublished => Sources.Sum(s => s.Published);
    public int TotalFlagged => Sources.Sum(s => s.Flagged);
    public int TotalSpam => Sources.Sum(s => s.Spam);
    public int TotalDuplicates => Sources.Sum(s => s.Duplicates);
}

/// <summary>
/// The scrape engine. For every enabled source: dedupe by content hash → parse → rule-validate →
/// (optional) AI audit → decide. Decision depends on admin settings:
///   • spam → Discarded
///   • AI on: AI verdict drives approve/reject/review; approve + Automatic + AiAutoApprove → publish
///   • AI off: Automatic + confidence ≥ threshold → publish; else queue/flag
/// "Publish" resolves-or-creates an (unverified) facility and creates the Shift/JobOpening.
/// </summary>
public class IngestionService
{
    /// <summary>Applicant posts older than this (by the source's date, or a Persian "time ago"
    /// phrase in the text) are skipped at ingest — availability goes stale fast.</summary>
    private const int TalentMaxAgeDays = 7;

    private readonly AppDbContext _db;
    private readonly IEnumerable<IListingSource> _sources;
    private readonly IListingParser _parser;
    private readonly ListingValidator _validator;
    private readonly IAiAuditor _ai;
    private readonly SettingsService _settings;
    private readonly ILogger<IngestionService> _log;

    public IngestionService(AppDbContext db, IEnumerable<IListingSource> sources, IListingParser parser,
        ListingValidator validator, IAiAuditor ai, SettingsService settings, ILogger<IngestionService> log)
    {
        _db = db; _sources = sources; _parser = parser; _validator = validator;
        _ai = ai; _settings = settings; _log = log;
    }

    public IReadOnlyList<string> SourceNames => _sources.Select(s => s.Name).ToList();

    /// <summary>Shared placeholder facility name for unnamed ads — kept identical to
    /// Review.ResolveFacilityIdAsync so the auto-publish and manual-review flows reuse ONE record.</summary>
    private const string UnknownFacilityName = "نامشخص / ثبت نشده";

    public async Task<IngestionSummary> RunAsync(CancellationToken ct = default)
    {
        var settings = await _settings.GetAsync();
        var roles = await _db.Roles.ToListAsync(ct);
        var cities = await _db.Cities.ToListAsync(ct);
        var districts = await _db.Districts.ToListAsync(ct);
        var facilities = await _db.Facilities.ToListAsync(ct);   // fuzzy-matched + grown as we create
        var roleNames = roles.Select(r => r.Name).ToList();
        var cityNames = cities.Select(c => c.Name).ToList();
        var districtNames = districts.Select(d => d.Name).ToList();

        var results = new List<SourceResult>();

        foreach (var source in _sources)
        {
            int fetched = 0, queued = 0, published = 0, flagged = 0, spam = 0, dupes = 0;
            IReadOnlyList<ScrapedItem> items;
            try { items = await source.FetchAsync(settings, ct); }
            catch (Exception ex) { _log.LogError(ex, "Source {Source} failed", source.Name); continue; }
            if (items.Count == 0) continue;   // disabled/unconfigured source

            foreach (var item in items)
            {
                fetched++;
                var hash = Hash(item.RawText);
                var existing = await _db.RawListings.FirstOrDefaultAsync(r => r.ContentHash == hash, ct);
                if (existing is not null)
                {
                    // Best-effort geo retry: coords are normally captured only on first ingest, but a
                    // re-fetch may now expose a map center the first fetch lacked (Divar can fail-soft to
                    // null on a bad response / out-of-bbox). Backfill the cached row when this fetch has
                    // coords and the row has none, so an item still sitting in the queue can be placed on
                    // the map when an admin publishes it. (A full refresh is the purge-and-reingest flow.)
                    if (existing.Lat is null && item.Lat is not null) { existing.Lat = item.Lat; existing.Lng = item.Lng; }
                    dupes++; continue;
                }

                var parsed = _parser.Parse(item.RawText, roleNames, cityNames, districtNames);
                var val = _validator.Validate(item.RawText, parsed);

                // Drop STALE applicant («آماده به کار») posts — a person's availability goes cold fast.
                // Age = the source's real timestamp, else a Persian "time ago" phrase in the text
                // (Divar embeds «۲ هفته پیش»…). Recorded as Discarded (keeps the dedupe hash + audit
                // trail; no AI spend). Shifts/jobs are NOT aged out — their dates are in the future.
                if (parsed.Kind == ListingKind.Talent && PostAgeDays(item) is int age && age > TalentMaxAgeDays)
                {
                    _db.RawListings.Add(new RawListing
                    {
                        SourceChannel = item.Source, SourceUrl = item.SourceUrl, RawText = item.RawText.Trim(),
                        ContentHash = hash, Confidence = 0, Status = RawListingStatus.Discarded,
                        ValidationNotes = $"آماده‌به‌کارِ قدیمی ({age} روز) — نادیده گرفته شد",
                        Lat = item.Lat, Lng = item.Lng,
                    });
                    spam++; continue;
                }

                AiAuditResult? ai = null;
                if (settings.AiEnabled && !val.IsSpam)
                    ai = await _ai.AuditAsync(item.RawText, settings, ct);

                var (status, reason, confidence) = Decide(settings, val, ai);

                var raw = new RawListing
                {
                    SourceChannel = item.Source,
                    SourceUrl = item.SourceUrl,
                    RawText = item.RawText.Trim(),
                    ContentHash = hash,
                    Confidence = confidence,
                    ValidationNotes = reason,
                    Status = status,
                    Lat = item.Lat, Lng = item.Lng,   // approx. map coords (Divar) → facility on publish
                };
                _db.RawListings.Add(raw);

                if (status == RawListingStatus.Normalized)
                {
                    try { Publish(parsed, ai, raw, roles, cities, districts, facilities); published++; }
                    catch (Exception ex) { _log.LogWarning(ex, "Auto-publish failed; queueing instead"); raw.Status = RawListingStatus.New; queued++; }
                }
                else if (status == RawListingStatus.New) queued++;
                else if (status == RawListingStatus.Flagged) flagged++;
                else spam++;
            }

            await _db.SaveChangesAsync(ct);
            results.Add(new SourceResult(source.Name, fetched, queued, published, flagged, spam, dupes));
            _log.LogInformation("Ingest {S}: fetched={F} queued={Q} published={P} flagged={Fl} spam={Sp} dupes={D}",
                source.Name, fetched, queued, published, flagged, spam, dupes);
        }

        var summary = new IngestionSummary(results);

        await DedupeTalentAsync(ct);   // collapse same-ad reposts the exact-hash dedup can't catch

        // Self-clean after every crawl so the board stays tidy with no manual admin clicks: archive
        // out-of-scope/duplicate listings, merge duplicate + fold junk facilities, backfill coords.
        var cleanup = results.Count > 0 ? await RunPostIngestCleanupAsync(ct) : default;

        // Persist a run-log row so admins get a crawl history (with a per-source breakdown).
        if (results.Count > 0)
        {
            var detail = string.Join("؛ ", results.Select(r =>
                $"{r.Source}: یافت {r.Fetched}، صف {r.Queued}، منتشر {r.Published}، پرچم {r.Flagged}، اسپم {r.Spam}، تکراری {r.Duplicates}"))
                + $" || پاک‌سازیِ خودکار: {cleanup.archived} بایگانی، {cleanup.dedupedJobs} استخدامِ تکراری، {cleanup.mergedFac} مرکزِ ادغام، {cleanup.cleanedFac} مرکزِ حذف، {cleanup.coords} مختصات";
            _db.IngestionRuns.Add(new IngestionRun
            {
                Fetched = summary.TotalFetched,
                Queued = summary.TotalQueued,
                Published = summary.TotalPublished,
                Flagged = summary.TotalFlagged,
                Spam = summary.TotalSpam,
                Duplicates = summary.TotalDuplicates,
                Detail = detail.Length > 2000 ? detail[..2000] : detail,
            });
            await _db.SaveChangesAsync(ct);
        }

        return summary;
    }

    /// <summary>
    /// Re-run the CURRENT parser/AI/publish pipeline over every already-crawled RawListing, WITHOUT
    /// re-fetching from sources. Use this after improving the pipeline to clean up existing aggregated
    /// content (de-dupe, fix roles/categories/tags) — unlike <see cref="RunAsync"/> + the purge-cache
    /// flow, it keeps every raw text, so nothing is lost to sources only exposing recent posts.
    /// Deletes the old aggregated posts, then republishes from the stored raw text. Long-running
    /// (one AI call per item) — call it on a background scope, not inside a request.
    /// </summary>
    /// <param name="talentOnly">SEO-safe default: only «آماده به کار» (which is NoIndex/Disallow) is
    /// deleted &amp; rebuilt, so no INDEXED url changes. Shift/Job detail pages are indexed + in the
    /// sitemap, so churning their IDs would 404 ranked pages — instead they self-clean via turnover.
    /// Pass false only when you accept that SEO hit.</param>
    public async Task<IngestionSummary> ReprocessAsync(bool talentOnly = true, CancellationToken ct = default)
    {
        var settings = await _settings.GetAsync();
        var roles = await _db.Roles.ToListAsync(ct);
        var cities = await _db.Cities.ToListAsync(ct);
        var districts = await _db.Districts.ToListAsync(ct);
        var facilities = await _db.Facilities.ToListAsync(ct);   // reused (not deleted) → no facility churn
        var roleNames = roles.Select(r => r.Name).ToList();
        var cityNames = cities.Select(c => c.Name).ToList();
        var districtNames = districts.Select(d => d.Name).ToList();

        // Drop previously-published aggregated content; it's regenerated below from the raw text.
        // DB cascade clears their ContactMethods/Applications/InterestEvents; RawListing back-refs SetNull.
        await _db.TalentListings.Where(t => t.Source == ShiftSource.Aggregated).ExecuteDeleteAsync(ct);
        if (!talentOnly)
        {
            await _db.Shifts.Where(s => s.Source == ShiftSource.Aggregated).ExecuteDeleteAsync(ct);
            await _db.JobOpenings.Where(j => j.Source == ShiftSource.Aggregated).ExecuteDeleteAsync(ct);
        }

        int fetched = 0, queued = 0, published = 0, flagged = 0, spam = 0;
        var raws = await _db.RawListings.OrderBy(r => r.Id).ToListAsync(ct);
        foreach (var raw in raws)
        {
            ct.ThrowIfCancellationRequested();
            var parsed = _parser.Parse(raw.RawText, roleNames, cityNames, districtNames);

            // SEO-safe scope: in talent-only mode, leave indexed shift/job listings (and their
            // RawListing links/status) completely untouched — only applicants are rebuilt.
            if (talentOnly && parsed.Kind != ListingKind.Talent) continue;

            fetched++;
            raw.LinkedTalentId = null;                      // talent rows were just deleted
            if (!talentOnly) raw.LinkedShiftId = null;

            var val = _validator.Validate(raw.RawText, parsed);

            // Stale-applicant filter — age from the Persian "time ago" phrase in the text (Divar).
            if (parsed.Kind == ListingKind.Talent
                && HtmlUtil.AgeDaysFromPersianText(raw.RawText) is int age && age > TalentMaxAgeDays)
            {
                raw.Status = RawListingStatus.Discarded; raw.Confidence = 0;
                raw.ValidationNotes = $"آماده‌به‌کارِ قدیمی ({age} روز) — نادیده گرفته شد";
                spam++; continue;
            }

            AiAuditResult? ai = null;
            if (settings.AiEnabled && !val.IsSpam)
                ai = await _ai.AuditAsync(raw.RawText, settings, ct);

            var (status, reason, confidence) = Decide(settings, val, ai);
            raw.Status = status; raw.ValidationNotes = reason; raw.Confidence = confidence;

            if (status == RawListingStatus.Normalized)
            {
                try { Publish(parsed, ai, raw, roles, cities, districts, facilities); published++; }
                catch (Exception ex) { _log.LogWarning(ex, "Reprocess publish failed; queueing"); raw.Status = RawListingStatus.New; queued++; }
            }
            else if (status == RawListingStatus.New) queued++;
            else if (status == RawListingStatus.Flagged) flagged++;
            else spam++;

            if (fetched % 50 == 0) await _db.SaveChangesAsync(ct);   // incremental progress on long runs
        }
        await _db.SaveChangesAsync(ct);

        var deduped = await DedupeTalentAsync(ct);   // collapse reposts the exact-hash dedup missed

        _db.IngestionRuns.Add(new IngestionRun
        {
            Fetched = fetched, Queued = queued, Published = published, Flagged = flagged, Spam = spam, Duplicates = deduped,
            Detail = $"پردازش مجدد آیتم‌های ذخیره‌شده — {fetched} آیتم: {published} منتشر، {queued} صف، {flagged} پرچم، {spam} ردشده/قدیمی، {deduped} تکراریِ حذف‌شده",
        });
        await _db.SaveChangesAsync(ct);
        _log.LogInformation("Reprocess done: items={F} published={P} queued={Q} flagged={Fl} discarded={S} deduped={D}",
            fetched, published, queued, flagged, spam, deduped);

        return new IngestionSummary(new List<SourceResult>
            { new("پردازش مجدد", fetched, queued, published, flagged, spam, deduped) });
    }

    /// <summary>
    /// Collapse near-duplicate aggregated APPLICANTS left when a source reposts the same ad (different
    /// text → different ContentHash, so exact dedup missed them). Two high-precision signals: an
    /// identical phone, or identical (role, city, normalized description core with digits/«… پیش»
    /// time-phrases removed). Keeps the NEWEST of each group, deletes the rest. Returns the count removed.
    /// </summary>
    public async Task<int> DedupeTalentAsync(CancellationToken ct = default)
    {
        var rows = await _db.TalentListings
            .Where(t => t.Status == ShiftStatus.Open && t.Source == ShiftSource.Aggregated)
            .Select(t => new { t.Id, t.Phone, t.RoleId, t.CityId, t.Description, t.CreatedAt })
            .ToListAsync(ct);

        string? Sig(string? phone, int roleId, int cityId, string? desc)
        {
            var p = DigitsOnly(phone ?? "");
            if (p.Length >= 7) return "p:" + p;                              // same number = same person/repost
            var core = NormalizeFa(Regex.Replace(desc ?? "",
                @"[0-9۰-۹]+|روز پیش|ساعت پیش|هفته پیش|دقیقه پیش|دیروز|پریروز", " ")).Trim();
            if (core.Length < 15) return null;                              // too little to call it a dup safely
            return $"t:{roleId}:{cityId}:{(core.Length > 100 ? core[..100] : core)}";
        }

        var toRemove = rows
            .Select(r => new { r.Id, r.CreatedAt, Key = Sig(r.Phone, r.RoleId, r.CityId, r.Description) })
            .Where(x => x.Key is not null)
            .GroupBy(x => x.Key)
            .SelectMany(g => g.OrderByDescending(x => x.CreatedAt).Skip(1).Select(x => x.Id))
            .ToList();

        if (toRemove.Count == 0) return 0;
        var removed = await _db.TalentListings.Where(t => toRemove.Contains(t.Id)).ExecuteDeleteAsync(ct);
        _log.LogInformation("Deduped {N} near-duplicate applicants.", removed);
        return removed;
    }

    /// <summary>
    /// In-place geocoding backfill: for existing AGGREGATED listings in Tehran that still have no map
    /// coords, derive an APPROXIMATE neighbourhood center from the stored ad text (TehranGeo) and fill
    /// Lat/Lng. Unlike <see cref="ReprocessAsync"/> it never deletes or recreates rows, so listing IDs —
    /// and the indexed shift/job URLs in the sitemap — are untouched; safe to run on the live board.
    /// Only ever FILLS a null coordinate; a real point (Divar/employer/AI) is never overwritten.
    /// Returns how many listings were newly placed on the map.
    /// </summary>
    public async Task<int> BackfillCoordsAsync(CancellationToken ct = default)
    {
        var tehran = await _db.Cities.FirstOrDefaultAsync(c => c.Name == "تهران", ct);
        if (tehran is null) return 0;
        int filled = 0;

        var jobs = await _db.JobOpenings
            .Where(j => j.Status == ShiftStatus.Open && j.Lat == null && j.Source == ShiftSource.Aggregated && j.Facility.CityId == tehran.Id)
            .ToListAsync(ct);
        foreach (var j in jobs)
            if (TehranGeo.Locate(j.Description) is { } g) { j.Lat = g.lat; j.Lng = g.lng; filled++; }

        var shifts = await _db.Shifts
            .Where(s => s.Status == ShiftStatus.Open && s.Lat == null && s.Source == ShiftSource.Aggregated && s.Facility.CityId == tehran.Id)
            .ToListAsync(ct);
        foreach (var s in shifts)
            if (TehranGeo.Locate(s.Description) is { } g) { s.Lat = g.lat; s.Lng = g.lng; filled++; }

        var talent = await _db.TalentListings
            .Where(t => t.Status == ShiftStatus.Open && t.Lat == null && t.Source == ShiftSource.Aggregated && t.CityId == tehran.Id)
            .ToListAsync(ct);
        foreach (var t in talent)
            if (TehranGeo.Locate(t.AreaNote, t.Description) is { } g) { t.Lat = g.lat; t.Lng = g.lng; filled++; }

        if (filled > 0) await _db.SaveChangesAsync(ct);
        _log.LogInformation("Coordinate backfill placed {N} aggregated listings on the map.", filled);
        return filled;
    }

    /// <summary>
    /// The self-cleaning pass run automatically at the end of every crawl (and available on demand):
    /// archive out-of-scope/duplicate listings, merge duplicate + fold junk facilities, and backfill
    /// missing Tehran map coords. All in-place — reversible (archive, not delete) for listings, guarded
    /// (never touches employer/verified facilities) — and pure DB + CPU (no AI, no network), so it's
    /// cheap to run on every ingest. Keeps the board tidy without the admin clicking the cleanup buttons.
    /// </summary>
    public async Task<(int archived, int dedupedJobs, int mergedFac, int cleanedFac, int coords)>
        RunPostIngestCleanupAsync(CancellationToken ct = default)
    {
        var (archived, dedupedJobs) = await PurgeInvalidAggregatedAsync(ct);
        var (mergedFac, cleanedFac) = await MergeAndCleanFacilitiesAsync(ct);
        var coords = await BackfillCoordsAsync(ct);
        _log.LogInformation("Post-ingest cleanup: archived={A} dedupedJobs={DJ} mergedFac={MF} cleanedFac={CF} coords={C}",
            archived, dedupedJobs, mergedFac, cleanedFac, coords);
        return (archived, dedupedJobs, mergedFac, cleanedFac, coords);
    }

    /// <summary>
    /// SEO-safe in-place cleanup of the existing AGGREGATED job/shift board: re-screen each Open
    /// listing's stored text through the CURRENT validator and ARCHIVE (Status → Archived, not delete)
    /// only the ones that are now clearly out-of-scope — domestic-helper («امور منزل»),
    /// promotional/training, or spam (i.e. <see cref="ValidationResult.IsSpam"/>). Merely-incomplete-
    /// but-legit ads are KEPT. Then collapse near-duplicate job reposts the same way. Archiving (vs
    /// hard delete) is the project convention: the row is retained for analysis and the change is
    /// reversible, the listing drops out of every public screen + the sitemap (which filter Status ==
    /// Open), and its detail page returns 410 Gone (the standard "permanently removed" signal Google
    /// uses to deindex). Valid listings are never touched, so their IDs/URLs stay stable.
    /// Returns (archived, deduped).
    /// </summary>
    public async Task<(int archived, int deduped)> PurgeInvalidAggregatedAsync(CancellationToken ct = default)
    {
        var roleNames = await _db.Roles.Select(r => r.Name).ToListAsync(ct);
        var cityNames = await _db.Cities.Select(c => c.Name).ToListAsync(ct);
        var districtNames = await _db.Districts.Select(d => d.Name).ToListAsync(ct);

        bool IsOutOfScope(string? text)
        {
            var t = text ?? "";
            var parsed = _parser.Parse(t, roleNames, cityNames, districtNames);
            return _validator.Validate(t, parsed).IsSpam;   // spam | promo | domestic-helper
        }

        int archived = 0;

        var jobIds = (await _db.JobOpenings.Where(j => j.Status == ShiftStatus.Open && j.Source == ShiftSource.Aggregated)
                .Select(j => new { j.Id, j.Description }).ToListAsync(ct))
            .Where(j => IsOutOfScope(j.Description)).Select(j => j.Id).ToList();
        if (jobIds.Count > 0)
            archived += await _db.JobOpenings.Where(j => jobIds.Contains(j.Id))
                .ExecuteUpdateAsync(u => u.SetProperty(j => j.Status, ShiftStatus.Archived), ct);

        var shiftIds = (await _db.Shifts.Where(s => s.Status == ShiftStatus.Open && s.Source == ShiftSource.Aggregated)
                .Select(s => new { s.Id, s.Description }).ToListAsync(ct))
            .Where(s => IsOutOfScope(s.Description)).Select(s => s.Id).ToList();
        if (shiftIds.Count > 0)
            archived += await _db.Shifts.Where(s => shiftIds.Contains(s.Id))
                .ExecuteUpdateAsync(u => u.SetProperty(s => s.Status, ShiftStatus.Archived), ct);

        var deduped = await DedupeJobsAsync(ct);
        _log.LogInformation("Purge archived {R} out-of-scope aggregated listings; deduped {D} jobs.", archived, deduped);
        return (archived, deduped);
    }

    /// <summary>
    /// Collapse near-duplicate aggregated JOB reposts the exact-hash dedupe missed (same ad re-crawled
    /// with slightly different surrounding text → different ContentHash). Signature = role + facility +
    /// normalized description core with digits/«… پیش» time-phrases stripped. Keeps the NEWEST of each
    /// group and ARCHIVES the rest (Status → Archived, reversible — same rationale as the purge).
    /// Per-role fan-out of one ad is preserved (different RoleId → different signature).
    /// </summary>
    public async Task<int> DedupeJobsAsync(CancellationToken ct = default)
    {
        var gpId = await _db.Roles.Where(r => r.Name == "پزشک عمومی").Select(r => (int?)r.Id).FirstOrDefaultAsync(ct);
        var rows = await _db.JobOpenings
            .Where(j => j.Status == ShiftStatus.Open && j.Source == ShiftSource.Aggregated)
            .Select(j => new { j.Id, j.RoleId, j.FacilityId, j.Description, j.CreatedAt })
            .ToListAsync(ct);

        // Signature = facility + normalized description core (digits/«… پیش» stripped). RoleId is
        // deliberately NOT in the key, so the old role fan-out — the SAME ad published once per
        // extracted/typo role (پزشک عمومی، پرستار، بهیار، «بیهیار»…) — collapses into one.
        string? Sig(int facId, string? desc)
        {
            var core = NormalizeFa(Regex.Replace(desc ?? "",
                @"[0-9۰-۹]+|روز پیش|ساعت پیش|هفته پیش|دقیقه پیش|دیروز|پریروز", " ")).Trim();
            if (core.Length < 15) return null;                      // too little to call it a dup safely
            return $"j:{facId}:{(core.Length > 120 ? core[..120] : core)}";
        }

        // Keep one per group — prefer a non-«پزشک عمومی» role (the fan-out's GP copy is the usual
        // mislabel), then the newest.
        var toArchive = rows
            .Select(r => new { r.Id, r.RoleId, r.CreatedAt, Key = Sig(r.FacilityId, r.Description) })
            .Where(x => x.Key is not null)
            .GroupBy(x => x.Key)
            .SelectMany(g => g.OrderBy(x => x.RoleId == gpId ? 1 : 0).ThenByDescending(x => x.CreatedAt)
                              .Skip(1).Select(x => x.Id))
            .ToList();

        if (toArchive.Count == 0) return 0;
        var archived = await _db.JobOpenings.Where(j => toArchive.Contains(j.Id))
            .ExecuteUpdateAsync(u => u.SetProperty(j => j.Status, ShiftStatus.Archived), ct);
        _log.LogInformation("Archived {N} near-duplicate aggregated jobs.", archived);
        return archived;
    }

    /// <summary>
    /// Clean up the crawl-generated facility table: (1) fold listings of junk-named facilities
    /// («بیمارستان هستم», «... از مدجابز», bare «کلینیک») into the shared placeholder and delete the
    /// junk record; (2) merge Persian-fuzzy duplicates («سازمان برنامه جنوبی» ×3) into one keeper,
    /// repointing their shifts/jobs. HARD GUARD: only ever removes facilities that are purely
    /// crawl-generated (no owner, not verified, Unverified) and never the placeholder — employer- and
    /// admin-managed facilities are untouched. Listings are always repointed first, so no ad is lost.
    /// Returns (merged, cleaned).
    /// </summary>
    public async Task<(int merged, int cleaned)> MergeAndCleanFacilitiesAsync(CancellationToken ct = default)
    {
        var facilities = await _db.Facilities.ToListAsync(ct);

        var jobCounts = await _db.JobOpenings.GroupBy(j => j.FacilityId)
            .Select(g => new { g.Key, C = g.Count() }).ToDictionaryAsync(x => x.Key, x => x.C, ct);
        var shiftCounts = await _db.Shifts.GroupBy(s => s.FacilityId)
            .Select(g => new { g.Key, C = g.Count() }).ToDictionaryAsync(x => x.Key, x => x.C, ct);
        int Listings(int id) => jobCounts.GetValueOrDefault(id) + shiftCounts.GetValueOrDefault(id);

        // The shared "unknown" placeholder is worded differently in older data
        // («مرکز درمانی (نامشخص)») than the current constant, so an exact-name lookup found nothing and
        // the junk-fold step silently no-op'd. Match by the «نامشخص» marker and pick the bucket actually
        // used by the most listings — that's the real placeholder junk should fold into.
        var placeholder = facilities
            .Where(f => f.Name == UnknownFacilityName || FacilityMatcher.Normalize(f.Name).Contains("نامشخص"))
            .OrderByDescending(f => Listings(f.Id)).FirstOrDefault();
        var placeholderId = placeholder?.Id ?? -1;

        // Removable = purely crawl-generated and unmanaged. Never the placeholder, an owned, or a
        // verified facility (those carry real employer data / verification).
        bool Removable(Facility f) => f.OwnerUserId is null && !f.IsVerified
            && f.Verification == VerificationStatus.Unverified
            && (placeholder is null || f.Id != placeholder.Id);

        async Task AbsorbAsync(int fromId, int toId)
        {
            await _db.Shifts.Where(s => s.FacilityId == fromId)
                .ExecuteUpdateAsync(u => u.SetProperty(s => s.FacilityId, toId), ct);
            await _db.JobOpenings.Where(j => j.FacilityId == fromId)
                .ExecuteUpdateAsync(u => u.SetProperty(j => j.FacilityId, toId), ct);
            await _db.Facilities.Where(f => f.Id == fromId).ExecuteDeleteAsync(ct);   // cascades stray docs/reviews
        }

        int merged = 0, cleaned = 0;

        // 1) Junk-named crawl facilities → fold into the shared placeholder.
        if (placeholder is not null)
            foreach (var f in facilities.Where(f => Removable(f) && FacilityMatcher.IsJunkName(f.Name)).ToList())
            {
                await AbsorbAsync(f.Id, placeholder.Id);
                cleaned++;
            }

        // 2) Merge same-city Persian-fuzzy duplicates into the best keeper (never the placeholder).
        var remaining = (await _db.Facilities.ToListAsync(ct)).Where(f => f.Id != placeholderId).ToList();
        var done = new HashSet<int>();
        foreach (var f in remaining)
        {
            if (done.Contains(f.Id)) continue;
            done.Add(f.Id);
            var cluster = remaining.Where(o => o.Id != f.Id && !done.Contains(o.Id)
                && o.CityId == f.CityId && FacilityMatcher.IsSame(o.Name, f.Name)).ToList();
            if (cluster.Count == 0) continue;
            cluster.Add(f);
            // keeper: verified > owned > most listings > lowest id (oldest).
            var keeper = cluster.OrderByDescending(x => x.IsVerified)
                .ThenByDescending(x => x.OwnerUserId.HasValue)
                .ThenByDescending(x => Listings(x.Id)).ThenBy(x => x.Id).First();
            foreach (var dup in cluster.Where(x => x.Id != keeper.Id))
            {
                done.Add(dup.Id);
                if (!Removable(dup)) continue;   // never delete an employer/verified facility
                await AbsorbAsync(dup.Id, keeper.Id);
                merged++;
            }
        }

        _log.LogInformation("Facility cleanup: merged {M} duplicates, removed {C} junk facilities.", merged, cleaned);
        return (merged, cleaned);
    }

    /// <summary>
    /// In-place fix for EXISTING aggregated listings the AI mislabeled «پزشک عمومی» when the ad text
    /// actually names a more specific role (dentist, endocrinologist/«متخصص», lab, …). Re-runs the
    /// keyword parser + the same doctor-role guard over the stored text and updates RoleId (and the
    /// generic «استخدام پزشک عمومی» title) IN PLACE — no AI call, no delete/recreate, so IDs and
    /// indexed URLs are untouched. Only ever changes rows currently labeled «پزشک عمومی». Returns the
    /// number corrected.
    /// </summary>
    public async Task<int> RecorrectDoctorRolesAsync(CancellationToken ct = default)
    {
        var roles = await _db.Roles.ToListAsync(ct);
        var roleNames = roles.Select(r => r.Name).ToList();
        var cityNames = await _db.Cities.Select(c => c.Name).ToListAsync(ct);
        var districtNames = await _db.Districts.Select(d => d.Name).ToListAsync(ct);
        var gp = roles.FirstOrDefault(r => r.Name == "پزشک عمومی");
        if (gp is null) return 0;

        Role? Corrected(string? text)
        {
            var parsed = _parser.Parse(text ?? "", roleNames, cityNames, districtNames);
            var specific = parsed.RoleNames.FirstOrDefault(n => NormalizeFa(n) != NormalizeFa("پزشک عمومی"));
            if (specific is not null) return ResolveOrCreateRole(roles, specific, null);
            if (LooksSpecialist(text)) return ResolveOrCreateRole(roles, "پزشک متخصص", "پزشک");
            return null;
        }

        int fixedCount = 0;

        var jobs = await _db.JobOpenings
            .Where(j => j.Status == ShiftStatus.Open && j.Source == ShiftSource.Aggregated && j.RoleId == gp.Id)
            .ToListAsync(ct);
        foreach (var j in jobs)
        {
            if (Corrected(j.Description) is { } nr && nr.Id != j.RoleId)
            {
                if (string.IsNullOrWhiteSpace(j.Title) || j.Title == "استخدام پزشک عمومی") j.Title = $"استخدام {nr.Name}";
                j.RoleId = nr.Id; fixedCount++;
            }
        }

        var talent = await _db.TalentListings
            .Where(t => t.Status == ShiftStatus.Open && t.Source == ShiftSource.Aggregated && t.RoleId == gp.Id)
            .ToListAsync(ct);
        foreach (var t in talent)
            if (Corrected(t.Description) is { } nr && nr.Id != t.RoleId) { t.RoleId = nr.Id; fixedCount++; }

        if (fixedCount > 0) await _db.SaveChangesAsync(ct);
        _log.LogInformation("Recorrected {N} «پزشک عمومی»-mislabeled aggregated listings.", fixedCount);
        return fixedCount;
    }

    /// <summary>
    /// Collapse the role taxonomy that the dynamic ingestion let sprawl: exact duplicates («پرستار
    /// کودک» ×3), multi-role compounds («پرستار و بهیار»، «ماما / پرستار»), and typos («بیهیار»→بهیار).
    /// Each role is mapped to a canonical form (strip modifiers → collapse compound to first base role →
    /// alias) and same-canonical roles merge into one keeper, repointing every shift/job/talent/
    /// preference/alert/profile first (mirrors the manual /Admin/Roles merge). Returns roles removed.
    /// </summary>
    public async Task<int> MergeDuplicateRolesAsync(CancellationToken ct = default)
    {
        var roles = await _db.Roles.ToListAsync(ct);

        string Canon(string rawName)
        {
            var name = StripRoleModifiers(rawName);
            if (CollapseCompound(roles, name) is { } b) name = b;
            var norm = NormalizeFa(name);
            return RoleAliases.TryGetValue(norm, out var c) ? NormalizeFa(c) : norm;
        }

        int merged = 0;
        foreach (var g in roles.GroupBy(r => Canon(r.Name)).Where(g => g.Count() > 1))
        {
            // Keeper: a role whose own name IS the canonical (a clean base role), then the lowest Id.
            var keeper = g.OrderBy(r => NormalizeFa(r.Name) == g.Key ? 0 : 1).ThenBy(r => r.Id).First();
            foreach (var dup in g.Where(r => r.Id != keeper.Id))
            {
                await _db.Shifts.Where(x => x.RoleId == dup.Id).ExecuteUpdateAsync(u => u.SetProperty(x => x.RoleId, keeper.Id), ct);
                await _db.JobOpenings.Where(x => x.RoleId == dup.Id).ExecuteUpdateAsync(u => u.SetProperty(x => x.RoleId, keeper.Id), ct);
                await _db.TalentListings.Where(x => x.RoleId == dup.Id).ExecuteUpdateAsync(u => u.SetProperty(x => x.RoleId, keeper.Id), ct);
                await _db.UserPreferences.Where(x => x.RoleId == dup.Id).ExecuteUpdateAsync(u => u.SetProperty(x => x.RoleId, (int?)keeper.Id), ct);
                await _db.JobAlerts.Where(x => x.RoleId == dup.Id).ExecuteUpdateAsync(u => u.SetProperty(x => x.RoleId, (int?)keeper.Id), ct);
                await _db.DoctorProfiles.Where(x => x.RoleId == dup.Id).ExecuteUpdateAsync(u => u.SetProperty(x => x.RoleId, (int?)keeper.Id), ct);
                await _db.Roles.Where(r => r.Id == dup.Id).ExecuteDeleteAsync(ct);
                merged++;
            }
        }
        _log.LogInformation("Merged {N} duplicate/compound/typo roles.", merged);
        return merged;
    }

    private static string DigitsOnly(string s) => new(HtmlUtil.ToLatinDigits(s).Where(char.IsDigit).ToArray());

    private static (RawListingStatus status, string? reason, int confidence) Decide(
        AppSetting s, ValidationResult val, AiAuditResult? ai)
    {
        var notes = val.Issues.Count > 0 ? string.Join("؛ ", val.Issues) : null;

        if (val.IsSpam)
            return (RawListingStatus.Discarded, Join("اسپم", notes), val.Confidence);

        if (ai is not null)
        {
            var aiNote = Join($"AI: {ai.Decision} ({ai.Confidence}٪)" + (ai.Reason is null ? "" : $" — {ai.Reason}"), notes);
            if (ai.Reject) return (RawListingStatus.Discarded, aiNote, ai.Confidence);
            if (ai.Approve)
            {
                // MEDICAL GATE: the rule-validator's medical signal vetoes an AI approval. The AI can
                // hallucinate (e.g. approved a GeekVape product ad 95% as a «پرستار» job) — when our
                // own keyword/role check sees nothing clinical, never auto-publish; send to review.
                if (!val.LooksMedical)
                    return (RawListingStatus.Flagged, Join("هوش مصنوعی تأیید کرد ولی نشانهٔ کادر درمان یافت نشد — بررسی دستی", aiNote), ai.Confidence);
                return (s.Mode == IngestionMode.Automatic && s.AiAutoApprove
                    ? RawListingStatus.Normalized : RawListingStatus.New, aiNote, ai.Confidence);
            }
            return (RawListingStatus.Flagged, aiNote, ai.Confidence);  // review
        }

        if (!val.IsValid) return (RawListingStatus.Flagged, notes, val.Confidence);
        if (s.Mode == IngestionMode.Automatic && val.Confidence >= s.AutoPublishMinConfidence)
            return (RawListingStatus.Normalized, notes, val.Confidence);
        return (RawListingStatus.New, notes, val.Confidence);
    }

    private void Publish(ParsedListing parsed, AiAuditResult? ai, RawListing raw,
        List<Role> roles, List<City> cities, List<District> districts, List<Facility> facilities)
    {
        var d = ai?.Data;
        var cityName = d?.City ?? parsed.CityName;
        var districtName = d?.District ?? parsed.DistrictName;

        // One ad can name several roles («پرستار سالمند و کودک و همراه بیمار») — resolve them all
        // and publish one listing per role so each is browsable/filterable. Capped to avoid spam.
        // The AI's role (+ its category) is the trusted, possibly-new one; parser names are already
        // canonical matches. Unknown roles are CREATED (dynamic taxonomy), not dropped.
        var candidates = new List<(string name, string? category)>();
        if (!string.IsNullOrWhiteSpace(d?.Role)) candidates.Add((d!.Role!.Trim(), d.Category));
        foreach (var n in parsed.RoleNames) candidates.Add((n, null));
        if (parsed.RoleName is not null) candidates.Add((parsed.RoleName, null));

        var pubRoles = new List<Role>();
        foreach (var (name, category) in candidates)
        {
            if (string.IsNullOrWhiteSpace(name)) continue;
            var role = ResolveOrCreateRole(roles, name, category);
            if (!pubRoles.Contains(role)) pubRoles.Add(role);
            if (pubRoles.Count >= 4) break;
        }
        if (pubRoles.Count == 0) pubRoles.Add(roles.First());

        // Doctor-role guard. «پزشک عمومی» is the AI's fallback when it's unsure, so it mislabels
        // clearly-specific doctor ads — a dentist ad («دعوت به همکاری دندانپزشک») or an ENT/specialist
        // one published as «استخدام پزشک عمومی». Rather than patch role-by-role, trust the keyword
        // parser: if IT already found a more specific role in the same text, use that; otherwise fall
        // back to «پزشک متخصص» when the text says specialist. Only ever overrides the weak GP default.
        if (pubRoles[0].Name == "پزشک عمومی")
        {
            var specific = parsed.RoleNames.FirstOrDefault(n => NormalizeFa(n) != NormalizeFa("پزشک عمومی"));
            if (specific is not null)
                pubRoles[0] = ResolveOrCreateRole(roles, specific, null);
            else if (LooksSpecialist(raw.RawText))
                pubRoles[0] = ResolveOrCreateRole(roles, "پزشک متخصص", "پزشک");
        }

        var city = cities.FirstOrDefault(c => c.Name == cityName)
                   ?? cities.FirstOrDefault(c => c.IsActive) ?? cities.First();
        var district = districts.FirstOrDefault(x => x.Name == districtName && x.CityId == city.Id);

        // Approx. coords for the map: the source ad's point (Divar) when present; otherwise, for a
        // Tehran ad that only NAMES a neighborhood (Medjobs/Telegram), geocode that name to a rough
        // center. Shown as a «محدودهٔ تقریبی» circle, never a precise pin.
        double? appLat = raw.Lat, appLng = raw.Lng;
        // Geocode from the structured location fields first, then fall back to scanning the ad body
        // itself — many Tehran ads name the neighbourhood only in free text («… نیم ساعت پیش در سهروردی»)
        // and never populate a district/area field, which is why most aggregated listings had no map.
        if (appLat is null && city.Name == "تهران"
            && TehranGeo.Locate(district?.Name, districtName, parsed.AreaNote, raw.RawText) is { } g)
        { appLat = g.lat; appLng = g.lng; }
        // Last resort — the AI model's inferred coords, but ONLY when they fall inside greater Tehran
        // (rejects a hallucinated point elsewhere). Uses the registered model where the rules can't decide.
        if (appLat is null && d?.Lat is double aLat && d?.Lng is double aLng && InTehran(aLat, aLng))
        { appLat = aLat; appLng = aLng; }

        var kindStr = (d?.Kind ?? parsed.Kind.ToString()).ToLowerInvariant();

        // «آماده به کار» — a worker offering themselves. No facility involved.
        if (parsed.Kind == ListingKind.Talent || kindStr.Contains("talent") || kindStr.Contains("آماده"))
        {
            // Skip uncontactable applicants: no phone, no other contact channel, AND no source link to
            // click through to — such a card is useless to an employer. (A source URL is enough, since
            // the detail page now offers a «مشاهده آگهی در منبع» link for any source.)
            var reachable = !string.IsNullOrWhiteSpace(d?.Phone) || !string.IsNullOrWhiteSpace(parsed.Phone)
                || parsed.Contacts.Count > 0 || !string.IsNullOrWhiteSpace(raw.SourceUrl);
            if (!reachable) { raw.Status = RawListingStatus.Discarded; return; }

            // ONE person = ONE listing. Do NOT fan out across roles: an applicant has a single
            // profession, and «پرستار» + «پرستار کودک» from the same ad were producing duplicate
            // cards. Use the primary (AI) role; any secondary role names become searchable tags.
            var role = pubRoles[0];
            var extraRoleTags = pubRoles.Skip(1).Select(r => r.Name);
            var tPay = d?.PayAmount ?? parsed.PayAmount;
            var tShare = d?.SharePercent ?? parsed.SharePercent;
            _db.TalentListings.Add(new TalentListing
            {
                Role = role, City = city, DistrictId = district?.Id,
                PersonName = !string.IsNullOrWhiteSpace(d?.PersonName) ? d!.PersonName!.Trim() : parsed.PersonName,
                YearsExperience = d?.YearsExperience ?? parsed.YearsExperience,
                IsLicensed = d?.IsLicensed ?? parsed.IsLicensed,
                AreaNote = parsed.AreaNote,
                Availability = MapEmployment(d?.EmploymentType, parsed.EmploymentType),
                Gender = parsed.Gender,
                PayType = tShare is not null && tPay is null ? PayType.Percentage
                          : tPay is null ? PayType.Negotiable : PayType.PerShift,
                PayAmount = tPay, SharePercent = tShare,
                Phone = !string.IsNullOrWhiteSpace(d?.Phone) ? d!.Phone!.Trim() : parsed.Phone,
                Description = raw.RawText,
                Status = ShiftStatus.Open, Source = ShiftSource.Aggregated, SourceUrl = raw.SourceUrl,
                Lat = appLat, Lng = appLng,   // source point (Divar) or geocoded neighborhood center
                Contacts = BuildContacts(d, parsed),
                Tags = BuildTags(parsed, d, role, city, extraRoleTags),
            });
            raw.Status = RawListingStatus.Normalized;
            return;
        }

        // Never surface the crawl source (e.g. «مدجابز») in a public facility name. An unnamed ad
        // falls back to ONE shared placeholder (same string as the manual-review flow, so both
        // pipelines reuse a single record). That placeholder is shared by every unnamed ad in a
        // city, so it must NEVER receive a single ad's fuzzy coords — that would mis-place dozens of
        // unrelated listings on the map and in «near me». Mirrors Review.ResolveFacilityIdAsync.
        bool unnamed = string.IsNullOrWhiteSpace(d?.FacilityName) && string.IsNullOrWhiteSpace(parsed.FacilityName);
        var facilityName = !string.IsNullOrWhiteSpace(d?.FacilityName) ? d!.FacilityName!.Trim()
            : !string.IsNullOrWhiteSpace(parsed.FacilityName) ? parsed.FacilityName!.Trim()
            : UnknownFacilityName;
        // Reuse an existing facility (exact or Persian-aware fuzzy match) before creating a new one.
        var facility = FacilityMatcher.FindBest(facilities, facilityName, city.Id);
        if (facility is null)
        {
            facility = new Facility
            {
                Name = facilityName, Type = FacilityType.Clinic, City = city, DistrictId = district?.Id,
                Phone = !string.IsNullOrWhiteSpace(d?.Phone) ? d!.Phone!.Trim() : parsed.Phone, IsVerified = false,
                Lat = unnamed ? null : raw.Lat, Lng = unnamed ? null : raw.Lng,   // approx. Divar map center
            };
            _db.Facilities.Add(facility);
            facilities.Add(facility);   // so later listings in this run match it too
        }
        else if (!unnamed && facility.Lat is null && facility.Lng is null && raw.Lat is not null)
        {
            // Backfill coords only when the matched (real, named) facility has none — never overwrite a
            // real (employer-set or verified) location with Divar's fuzzy point.
            facility.Lat = raw.Lat; facility.Lng = raw.Lng;
        }

        // ONE ad = ONE listing. Do NOT fan out across roles. A single ad naming a few role-ish words
        // («استخدام بهیار جهت دستیار پزشک و تزریقات») was exploding into 5 near-duplicate listings —
        // one per extracted/typo role (پزشک عمومی، پرستار، دستیار پزشک، بهیار، «بیهیار»). Publish only
        // the primary (guard-corrected) role; the rest stay findable via the full description text.
        var primaryRole = pubRoles[0];
        if (kindStr.Contains("job") || kindStr.Contains("استخدام"))
        {
            _db.JobOpenings.Add(new JobOpening
            {
                Facility = facility, Role = primaryRole,
                Title = $"استخدام {primaryRole.Name}",
                EmploymentType = MapEmployment(d?.EmploymentType, parsed.EmploymentType),
                // Prefer the AI-extracted salary, falling back to the parser's (matching the talent path).
                SalaryMin = d?.PayAmount ?? parsed.PayAmount,
                Description = raw.RawText, Status = ShiftStatus.Open, Source = ShiftSource.Aggregated,
                SourceUrl = raw.SourceUrl,
                Lat = appLat, Lng = appLng,   // source point (Divar) or geocoded neighborhood center
                Contacts = BuildContacts(d, parsed),   // the ad's OWN number(s)
            });
        }
        else
        {
            var st = MapShiftType(d?.ShiftType, parsed.ShiftType);
            var (start, end) = DefaultTimes(st);
            _db.Shifts.Add(new Shift
            {
                Facility = facility, Role = primaryRole,
                Date = DateOnly.FromDateTime(DateTime.UtcNow).AddDays(1),
                StartTime = start, EndTime = end, ShiftType = st,
                SpecialtyRequired = primaryRole.Name, Description = raw.RawText,
                PayType = parsed.SharePercent is not null && parsed.PayAmount is null ? PayType.Percentage
                          : parsed.PayAmount is null ? PayType.Negotiable : PayType.PerShift,
                PayAmount = parsed.PayAmount, SharePercent = parsed.SharePercent,
                Status = ShiftStatus.Open, Source = ShiftSource.Aggregated, SourceUrl = raw.SourceUrl,
                Lat = appLat, Lng = appLng,   // source point (Divar) or geocoded neighborhood center
                Contacts = BuildContacts(d, parsed),   // the ad's OWN number(s)
            });
        }
        raw.Status = RawListingStatus.Normalized;
    }

    /// <summary>Space-separated searchable tags: parsed cert/skill tags + AI-detected skills/requirements
    /// + secondary role names + this listing's role/category + city. Pay/contact/location noise and
    /// sentence fragments are filtered out so chips stay clinical. Drives deep search + tag chips.</summary>
    private static string BuildTags(ParsedListing parsed, AiStructured? d, Role role, City city,
        IEnumerable<string>? extraRoles = null)
    {
        var tags = new List<string>(parsed.Tags) { role.Name, role.Category, city.Name };
        if (extraRoles is not null) tags.AddRange(extraRoles);
        if (d?.Tags is not null)
            tags.AddRange(d.Tags.Where(t => !string.IsNullOrWhiteSpace(t)).Select(t => t.Trim()));
        return string.Join(" ", tags
            .Where(t => !string.IsNullOrWhiteSpace(t) && !IsNoiseTag(t))
            .Select(t => t.Trim())
            .Distinct());
    }

    // Words/phrases that are NOT clinical skills — pay, contact, generic verbs, sentence fragments —
    // that were polluting the tag chips («پرداخت توافقی»، «مراقبت از»…).
    private static readonly string[] TagStopWords =
    {
        "توافقی", "پرداخت", "پرداخت توافقی", "حقوق", "دستمزد", "تماس", "شماره", "شماره تماس",
        "مراقبت از", "مراقبت", "همکاری", "آماده", "آماده به کار", "نیرو", "استخدام", "جذب",
        // personality / filler — not clinical skills
        "خوش‌اخلاق", "خوش اخلاق", "خوشاخلاق", "دلسوز", "منظم", "مسئولیت‌پذیر", "مسئولیت پذیر", "باتجربه", "مجرب",
    };

    private static bool IsNoiseTag(string tag)
    {
        var t = NormalizeFa(tag);
        if (t.Length < 2 || t.EndsWith(" از") || t.EndsWith("-از")) return true;   // dangling «… از»
        return TagStopWords.Any(w => NormalizeFa(w) == t);
    }

    /// <summary>Resolve a role name to an existing Role; if it's genuinely new, create it (dynamic
    /// taxonomy). Matching is layered so a differently-worded-but-same-meaning role maps to the
    /// canonical one instead of forking: (1) exact normalized name, (2) synonym/abbreviation alias
    /// → canonical (دکتر→پزشک عمومی، نرس→پرستار…), (3) create. Only TRUE synonyms collapse — real
    /// sub-specialties («پرستار ICU») stay distinct on purpose.</summary>
    // Separators that join SEVERAL roles in one ad («پرستار و بهیار»، «ماما / پرستار»، «پزشک و پرستار
    // و بهیار»). A specialty name that legitimately contains «و» (قلب و عروق، پوست و مو) is NOT split,
    // because its first segment isn't itself a known role.
    private static readonly Regex RoleSeparators =
        new(@"\s*/\s*|\s*،\s*|\s*,\s*|\s+یا\s+|\s+و\s+|\s*\+\s*", RegexOptions.Compiled);

    /// <summary>If <paramref name="name"/> is a multi-role compound whose FIRST segment is (or aliases
    /// to) an existing role, return that base role's name; otherwise null. So «پرستار و بهیار» → «پرستار»
    /// but «قلب و عروق» / «پوست و مو» are left whole.</summary>
    private static string? CollapseCompound(List<Role> roles, string name)
    {
        var segs = RoleSeparators.Split(name).Select(s => s.Trim()).Where(s => s.Length > 1).ToList();
        if (segs.Count < 2) return null;
        var fnorm = NormalizeFa(segs[0]);
        if (roles.Any(r => NormalizeFa(r.Name) == fnorm)) return segs[0];
        if (RoleAliases.TryGetValue(fnorm, out var canon) && roles.Any(r => NormalizeFa(r.Name) == NormalizeFa(canon)))
            return canon;
        return null;
    }

    private Role ResolveOrCreateRole(List<Role> roles, string name, string? category)
    {
        // Drop gender/seniority modifiers baked into the role («پرستار آقا»→«پرستار»,
        // «کارآموز تکنسین داروخانه»→«تکنسین داروخانه»). None of the real roles contain these tokens,
        // so it only collapses sprawl — the modifier still lives on as a tag / the Gender field.
        name = StripRoleModifiers(name);
        // Collapse a multi-role compound to its first base role so we don't mint «پرستار و بهیار».
        if (CollapseCompound(roles, name) is { } baseName) name = baseName;
        var norm = NormalizeFa(name);

        // (1) Already a known role (same word or spelling variant).
        var match = roles.FirstOrDefault(r => NormalizeFa(r.Name) == norm);
        if (match is not null) return match;

        // (2) A synonym of a canonical role → use that role; don't create a duplicate.
        if (RoleAliases.TryGetValue(norm, out var canonical))
        {
            var canonNorm = NormalizeFa(canonical);
            var aliased = roles.FirstOrDefault(r => NormalizeFa(r.Name) == canonNorm);
            if (aliased is not null) return aliased;
            name = canonical; norm = canonNorm;   // canonical not seeded yet → create under its proper name
        }

        // (3) Genuinely new role — create it under a canonical-resolved category.
        var created = new Role
        {
            Name = Clamp(name.Trim(), 100),                  // respect Role.Name MaxLength(100)
            Category = Clamp(ResolveCategory(category), 50),  // closed set → respect MaxLength(50)
            IsActive = true,
            SortOrder = (roles.Count == 0 ? 0 : roles.Max(r => r.SortOrder)) + 1,
        };
        _db.Roles.Add(created);
        roles.Add(created);   // reuse within this run (saved with the batch at end of source)
        _log.LogInformation("Ingestion introduced new role «{Role}» (category «{Category}») from AI.",
            created.Name, created.Category);
        return created;
    }

    /// <summary>Map an AI-suggested category to one of the FIXED groups (پزشک/پرستار/ماما/تکنسین/
    /// دندانپزشک). Categories are a closed taxonomy — they drive the filter chips — so unlike roles
    /// they are NEVER invented: a synonym resolves to its canonical group, anything else → «سایر».
    /// (CategoryAliases maps each canonical group to itself, so exact matches resolve here too.)</summary>
    private static string ResolveCategory(string? category)
        => CategoryAliases.TryGetValue(NormalizeFa(category), out var canonical) ? canonical : "سایر";

    // Synonyms/abbreviations → canonical ROLE name, so the AI naming a role differently maps onto an
    // existing role instead of forking the taxonomy. Keys are matched after NormalizeFa. Add freely.
    private static readonly Dictionary<string, string> RoleAliases = BuildAliasMap(new()
    {
        ["پزشک عمومی"]             = new[] { "دکتر", "طبیب", "پزشک", "جی پی", "gp", "general practitioner" },
        ["پزشک متخصص"]            = new[] { "متخصص", "فوق تخصص", "اسپشالیست", "specialist" },
        ["پرستار"]                 = new[] { "نرس", "nurse", "پرستاری", "کارشناس پرستاری" },
        ["پرستار سالمندان"]        = new[] { "مراقب سالمند", "مراقب سالمندان", "پرستار سالمند", "نگهدار سالمند", "مراقبت سالمند" },
        ["ماما"]                   = new[] { "مامایی", "کارشناس مامایی", "midwife" },
        ["تکنسین اتاق عمل"]        = new[] { "اتاق عمل", "اسکراب", "scrub", "تکنولوژیست اتاق عمل" },
        ["تکنسین فوریت‌های پزشکی"]  = new[] { "فوریت پزشکی", "تکنسین اورژانس", "پارامدیک", "paramedic", "emt", "اورژانس ۱۱۵" },
        ["کارشناس آزمایشگاه"]      = new[] { "علوم آزمایشگاهی", "تکنسین آزمایشگاه", "آزمایشگاهی", "لابراتوار", "lab", "laboratory" },
        ["دندانپزشک"]             = new[] { "دندان پزشک", "دندون پزشک", "dentist" },
        ["کمک بهیار"]             = new[] { "کمک‌یار", "کمکیار", "کمک یار", "کمک‌بهیار", "کمک بیمار" },
        ["بهیار"]                  = new[] { "بیهیار", "بیار", "بیهی", "بهییار", "بهیار پرستار" },
        ["پرستار کودک"]            = new[] { "پرستار بچه", "مراقب کودک", "پرستار مراقب کودک", "کودکیار", "مادر یار کودک", "پرستار اطفال" },
        ["فیزیوتراپیست"]           = new[] { "فیزیوتراپ", "فیزیوتراپی" },
        ["تکنسین داروخانه"]        = new[] { "نسخه پیچ", "تکنسین نسخه پیچ" },
    });

    // Synonyms → canonical CATEGORY (the role-group used for filters/chips).
    private static readonly Dictionary<string, string> CategoryAliases = BuildAliasMap(new()
    {
        ["پزشک"]      = new[] { "دکتر", "طبیب", "doctor", "پزشکی" },
        ["پرستار"]    = new[] { "پرستاری", "nurse", "nursing" },
        ["ماما"]      = new[] { "مامایی", "midwifery" },
        ["تکنسین"]    = new[] { "تکنیسین", "تکنولوژیست", "technician", "کاردان فنی" },
        ["دندانپزشک"] = new[] { "دندان پزشک", "دندانپزشکی", "dental" },
    });

    /// <summary>Flatten {canonical → [synonyms]} into a {normalized synonym → canonical} lookup,
    /// also mapping each canonical's own normalized form to itself.</summary>
    private static Dictionary<string, string> BuildAliasMap(Dictionary<string, string[]> src)
    {
        var map = new Dictionary<string, string>();
        foreach (var (canonical, aliases) in src)
        {
            map[NormalizeFa(canonical)] = canonical;
            foreach (var a in aliases) map[NormalizeFa(a)] = canonical;
        }
        return map;
    }

    /// <summary>Normalize a Persian string for dedupe: unify Arabic/Persian ي→ی and ك→ک, drop ZWNJ,
    /// collapse whitespace, trim, lowercase (so Latin tags like "ICU"/"icu" also match).</summary>
    private static string NormalizeFa(string? s) => Regex.Replace(
        (s ?? "").Replace('ي', 'ی').Replace('ك', 'ک').Replace('‌', ' ').Trim(),
        @"\s+", " ").ToLowerInvariant();

    private static string Clamp(string s, int max) => s.Length <= max ? s : s[..max].Trim();

    /// <summary>Greater-Tehran bounding box — rejects out-of-area (hallucinated) AI coordinates.</summary>
    private static bool InTehran(double lat, double lng) => lat is >= 35.4 and <= 35.95 && lng is >= 51.0 and <= 51.8;

    // Markers that mean a doctor role is a SPECIALIST, not a GP — used to correct a «پزشک عمومی»
    // mislabel on a clearly-specialist ad (e.g. an ENT post showing as «استخدام پزشک عمومی»).
    private static readonly string[] SpecialistMarkers =
        { "متخصص", "فوق تخصص", "فوقتخصص", "فلوشیپ", "فلوشیب", "بورد تخصصی", "ساب اسپشالیتی", "ent" };

    private static bool LooksSpecialist(string? rawText)
    {
        var t = NormalizeFa(rawText);
        return SpecialistMarkers.Any(m => t.Contains(NormalizeFa(m)));
    }

    // Gender/seniority tokens that don't belong in a role name (they go to tags / the Gender field).
    private static readonly string[] RoleModifierWords =
        { "آقا", "خانم", "خانوم", "بانو", "مرد", "زن", "کارآموز", "کارورز", "ارشد", "مبتدی" };

    // Availability phrases that the model sometimes glues onto the role («کمک بهیار آماده به کار»);
    // removed as whole substrings before token-stripping (so «به»/«کار» tokens stay safe elsewhere).
    private static readonly string[] RolePhraseNoise =
        { "آماده به کار", "آماده همکاری", "آماده بکار", "آماده به همکاری", "جویای کار", "دنبال کار", "جهت همکاری" };

    /// <summary>Remove availability phrases + gender/seniority tokens from a role name, keeping the
    /// base profession. Never strips to empty (falls back to the original).</summary>
    private static string StripRoleModifiers(string name)
    {
        var n = NormalizeFa(name);
        foreach (var p in RolePhraseNoise) n = n.Replace(NormalizeFa(p), " ");
        var kept = n.Split(' ', StringSplitOptions.RemoveEmptyEntries)
            .Where(t => !RoleModifierWords.Any(m => NormalizeFa(m) == t)).ToList();
        return kept.Count > 0 ? string.Join(" ", kept) : name.Trim();
    }

    /// <summary>Fresh ContactMethod rows for one talent listing (parser contacts + AI phone).</summary>
    private static List<ContactMethod> BuildContacts(AiStructured? d, ParsedListing parsed)
    {
        var contacts = parsed.Contacts
            .Select((c, i) => new ContactMethod { Type = c.Type, Value = c.Value, SortOrder = i })
            .ToList();
        if (!string.IsNullOrWhiteSpace(d?.Phone)
            && !contacts.Any(c => c.Type is ContactType.Mobile or ContactType.Phone))
            contacts.Insert(0, new ContactMethod { Type = ContactType.Mobile, Value = d!.Phone!.Trim(), SortOrder = -1 });
        return contacts;
    }

    private static ShiftType MapShiftType(string? ai, ShiftType? parsed) => (ai?.ToLowerInvariant()) switch
    {
        "day" => ShiftType.Day, "evening" => ShiftType.Evening, "night" => ShiftType.Night, "oncall" => ShiftType.OnCall,
        _ => parsed ?? ShiftType.Day,
    };

    private static EmploymentType MapEmployment(string? ai, EmploymentType? parsed) => (ai?.ToLowerInvariant()) switch
    {
        "parttime" => EmploymentType.PartTime, "contract" => EmploymentType.Contract,
        "plan" => EmploymentType.Plan, "fulltime" => EmploymentType.FullTime,
        _ => parsed ?? EmploymentType.FullTime,
    };

    private static (TimeOnly, TimeOnly) DefaultTimes(ShiftType t) => t switch
    {
        ShiftType.Day => (new TimeOnly(8, 0), new TimeOnly(14, 0)),
        ShiftType.Evening => (new TimeOnly(14, 0), new TimeOnly(20, 0)),
        ShiftType.Night => (new TimeOnly(20, 0), new TimeOnly(8, 0)),
        _ => (new TimeOnly(8, 0), new TimeOnly(8, 0)),
    };

    private static string? Join(string a, string? b) => string.IsNullOrEmpty(b) ? a : $"{a} | {b}";

    private static string Hash(string text)
    {
        var normalized = Regex.Replace((text ?? "").Trim(), @"\s+", " ");
        return Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(normalized))).ToLowerInvariant();
    }

    /// <summary>Age of a post in whole days — from the source's real timestamp when present, else a
    /// Persian "time ago" phrase in the text (Divar). Null when neither is available (= unknown age,
    /// so it's NOT filtered out).</summary>
    private static int? PostAgeDays(ScrapedItem item)
    {
        if (item.PostedAt is DateTime posted)
            return Math.Max(0, (int)Math.Floor((DateTime.UtcNow - posted).TotalDays));
        return HtmlUtil.AgeDaysFromPersianText(item.RawText);
    }
}