using System.Security.Cryptography;
using System.Text;
using Microsoft.EntityFrameworkCore;
using TeamUp.Modules.OrgBoard.Domain;
using TeamUp.Modules.OrgBoard.Persistence;

namespace TeamUp.Modules.OrgBoard.Profiles;

/// <summary>Upserts a product profile by (org, key, version) — the one place product profiles are written.</summary>
internal sealed class ProductProfileWriter(OrgBoardDbContext db, TimeProvider clock)
{
    /// <param name="insertOnly">
    /// When true the row must not already exist: a colliding (org, key, version) trips the unique
    /// index (DbUpdateException) instead of overwriting — the install path uses this so a race can't
    /// clobber an existing profile.
    /// </param>
    public async Task<ProductProfile> UpsertAsync(
        ProductProfileManifest manifest,
        string body,
        Guid? organizationId,
        ProfileOrigin origin,
        Guid? authoredByMemberId,
        bool insertOnly = false,
        CancellationToken cancellationToken = default)
    {
        var now = clock.GetUtcNow();
        var canonical = $"{manifest.Id}\n{manifest.Version}\n{manifest.Name}\n{manifest.Summary}\n{body}";
        var contentHash = Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(canonical)));

        var profile = insertOnly
            ? null
            : await db.ProductProfiles.FirstOrDefaultAsync(
                p => p.OrganizationId == organizationId && p.ProfileKey == manifest.Id && p.Version == manifest.Version,
                cancellationToken);

        var isNew = profile is null;
        profile ??= ProductProfile.Create(manifest.Id, manifest.Version, organizationId, now);
        profile.Apply(manifest, body, contentHash, origin, authoredByMemberId, now);

        if (isNew)
        {
            db.ProductProfiles.Add(profile);
        }

        await db.SaveChangesAsync(cancellationToken);
        return profile;
    }
}