using BlueLaminate.EFCore.Entities;
using Microsoft.EntityFrameworkCore;

namespace BlueLaminate.EFCore.Data;

/// <summary>
/// Write helpers for the per-site sweep checkpoints (<see cref="SkinSweep"/> /
/// <see cref="SkinConditionSweep"/>). Each marketplace sweeper stamps its own row
/// keyed by <c>(entity, source)</c>, so a band swept on one site is still "never
/// swept" on another. Adding a new site means a new <see cref="SweepSource"/>
/// constant — no schema changes.
/// <para>
/// Reads stay inline in the sweep queries (a correlated subquery over the navigation
/// for the relevant <c>Source</c>) so EF can translate and order by them server-side.
/// </para>
/// </summary>
public static class SweepCheckpoints
{
    /// <summary>
    /// Record that <paramref name="source"/> just swept this wear band. Upserts the
    /// single (condition, source) row via the change tracker; the caller persists with
    /// <see cref="DbContext.SaveChangesAsync"/>.
    /// </summary>
    public static async Task StampConditionAsync(
        SkinTrackerDbContext db, int conditionId, string source, DateTimeOffset sweptAt, CancellationToken ct)
    {
        var existing = await db.SkinConditionSweeps
            .FirstOrDefaultAsync(s => s.SkinConditionId == conditionId && s.Source == source, ct);
        if (existing is null)
        {
            db.SkinConditionSweeps.Add(new SkinConditionSweep
            {
                SkinConditionId = conditionId,
                Source = source,
                SweptAt = sweptAt,
            });
        }
        else
        {
            existing.SweptAt = sweptAt;
        }
    }

    /// <summary>As <see cref="StampConditionAsync"/>, for a whole-skin unit (no wear bands).</summary>
    public static async Task StampSkinAsync(
        SkinTrackerDbContext db, int skinId, string source, DateTimeOffset sweptAt, CancellationToken ct)
    {
        var existing = await db.SkinSweeps
            .FirstOrDefaultAsync(s => s.SkinId == skinId && s.Source == source, ct);
        if (existing is null)
        {
            db.SkinSweeps.Add(new SkinSweep
            {
                SkinId = skinId,
                Source = source,
                SweptAt = sweptAt,
            });
        }
        else
        {
            existing.SweptAt = sweptAt;
        }
    }
}