using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using SVSim.Database;
using SVSim.EmulatedEntrypoint.Models.Dtos.Requests.LeaderSkin;
using SVSim.EmulatedEntrypoint.Models.Dtos.Responses.LeaderSkin;

namespace SVSim.EmulatedEntrypoint.Controllers;

/// <summary>
/// /leader_skin/* — per-class "active leader skin" preference. The per-CLASS setting is the
/// fallback used when a deck has <c>leader_skin_id == 0</c>; per-deck overrides go through
/// /deck/update_leader_skin instead.
/// </summary>
[Route("leader_skin")]
public class LeaderSkinController : SVSimController
{
    private readonly SVSimDbContext _db;

    public LeaderSkinController(SVSimDbContext db)
    {
        _db = db;
    }

    [HttpPost("set")]
    public async Task<ActionResult<LeaderSkinSetResponse>> Set(LeaderSkinSetRequest request)
    {
        if (!TryGetViewerId(out long viewerId)) return Unauthorized();

        if (request.IsRandomLeaderSkin)
        {
            // Random-skin mode needs a per-viewer per-class shuffle pool, which we don't
            // persist yet (ViewerClassData has no list field for it). Punt for now.
            return StatusCode(StatusCodes.Status501NotImplemented,
                new { error = "random_leader_skin_not_implemented" });
        }

        var viewer = await _db.Viewers
            .Include(v => v.Classes).ThenInclude(c => c.Class)
            .Include(v => v.Classes).ThenInclude(c => c.LeaderSkin)
            .Include(v => v.LeaderSkins)
            .FirstOrDefaultAsync(v => v.Id == viewerId);
        if (viewer is null) return Unauthorized();

        var classData = viewer.Classes.FirstOrDefault(c => c.Class.Id == request.ClassId);
        if (classData is null) return BadRequest(new { error = "unknown_class" });

        // Skin must (a) exist in the catalog, (b) match the target class, (c) be owned by the viewer.
        var skin = await _db.LeaderSkins.FindAsync(request.LeaderSkinId);
        if (skin is null) return BadRequest(new { error = "unknown_skin" });
        if (skin.ClassId != request.ClassId) return BadRequest(new { error = "skin_class_mismatch" });
        if (viewer.LeaderSkins.All(s => s.Id != skin.Id))
            return BadRequest(new { error = "skin_not_owned" });

        classData.LeaderSkin = skin;
        await _db.SaveChangesAsync();

        return new LeaderSkinSetResponse
        {
            IsRandomLeaderSkin = false,
            LeaderSkinId = skin.Id,
            LeaderSkinIdList = new(),
        };
    }
}