using Pgvector;
using TeamUp.SharedKernel.Domain;

namespace TeamUp.Modules.Skills.Domain;

/// <summary>
/// An indexed skill atom: the projection of a SKILL.md (Git is the source of truth) into a
/// queryable Postgres + pgvector row. Identified by (SkillKey, Version).
/// </summary>
internal sealed class Skill : Entity
{
    public string SkillKey { get; private set; } = null!;
    public string Name { get; private set; } = null!;
    public string Version { get; private set; } = null!;
    public string? Summary { get; private set; }
    public List<string> Roles { get; private set; } = [];
    public string? Inputs { get; private set; }
    public string? Outputs { get; private set; }
    public List<SkillAction> Actions { get; private set; } = [];
    public List<string> Tools { get; private set; } = [];
    public List<string> Context { get; private set; } = [];
    public List<GoldenExample> GoldenTests { get; private set; } = [];
    public SkillVisibility Visibility { get; private set; }
    public SkillTier MinTier { get; private set; }
    public SkillStatus Status { get; private set; }
    public string Body { get; private set; } = null!;
    public string ContentHash { get; private set; } = null!;
    public string? SourceRepo { get; private set; }
    public string? SourcePath { get; private set; }
    public string? SourceCommit { get; private set; }
    public Vector? Embedding { get; private set; }
    public DateTimeOffset IndexedAtUtc { get; private set; }
    public DateTimeOffset UpdatedAtUtc { get; private set; }

    private Skill()
    {
    }

    public static Skill Create(string skillKey, string version, DateTimeOffset nowUtc) =>
        new() { SkillKey = skillKey, Version = version, IndexedAtUtc = nowUtc };

    /// <summary>(Re)projects a parsed manifest + body onto this row. Used for both insert and update.</summary>
    public void Index(
        SkillManifest manifest,
        string body,
        string contentHash,
        string? sourceRepo,
        string? sourcePath,
        string? sourceCommit,
        Vector? embedding,
        SkillStatus status,
        DateTimeOffset nowUtc)
    {
        Name = string.IsNullOrWhiteSpace(manifest.Name) ? manifest.Id : manifest.Name;
        Version = manifest.Version;
        Summary = manifest.Summary;
        Roles = manifest.Roles;
        Inputs = manifest.Inputs;
        Outputs = manifest.Outputs;
        Actions = manifest.Actions
            .Select(a => new SkillAction { Name = a.Name, Risk = ParseRisk(a.Risk), Description = a.Description })
            .ToList();
        Tools = manifest.Tools;
        Context = manifest.Context;
        GoldenTests = manifest.GoldenTests;
        Visibility = ParseVisibility(manifest.Visibility);
        MinTier = ParseTier(manifest.MinTier);
        Status = status;
        Body = body;
        ContentHash = contentHash;
        SourceRepo = sourceRepo;
        SourcePath = sourcePath;
        SourceCommit = sourceCommit;
        Embedding = embedding;
        UpdatedAtUtc = nowUtc;
    }

    private static string Normalize(string value) => value.Trim().Replace("-", string.Empty).Replace("_", string.Empty);

    private static ActionRisk ParseRisk(string value) => Normalize(value).ToLowerInvariant() switch
    {
        "draft" => ActionRisk.Draft,
        "publish" => ActionRisk.Publish,
        "destructive" => ActionRisk.Destructive,
        _ => ActionRisk.Read,
    };

    private static SkillVisibility ParseVisibility(string value) =>
        Normalize(value).ToLowerInvariant() is "privatetoorg" or "private" ? SkillVisibility.PrivateToOrg : SkillVisibility.Public;

    private static SkillTier ParseTier(string value) => Normalize(value).ToLowerInvariant() switch
    {
        "team" => SkillTier.Team,
        "scale" => SkillTier.Scale,
        "enterprise" => SkillTier.Enterprise,
        _ => SkillTier.Free,
    };
}