using DeluxeBackend.Models;
using DeluxeBackend.Services;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using static DeluxeBackend.Enums;

namespace DeluxeBackend.Controllers.Matchmaking
{
    [Route("Matchmaking/room")]
    [ApiController]
    [Authorize(Roles = "gameClient")]
    public class RoomController(IJwtService jwt, ILiteDbService db, DiscordBotService discord) : ControllerBase
    {
        [HttpGet("{roomId}/instances")]
        public async Task<IActionResult> Instances(long roomId)
        {
            var account = await jwt.GetLogin(User);
            if (account == null)
            {
                return Unauthorized();
            }

            var room = db.Rooms.FindById(roomId);
            if (room == null)
            {
                return NotFound();
            }

            bool isMod = await account.HasRoleAsync(discord, "moderator") || await account.HasRoleAsync(discord, "developer");
            if (!isMod && !room.HasRole(account.Id, RoomRoleType.Moderator))
            {
                return StatusCode(StatusCodes.Status403Forbidden, "Permission Denied");
            }

            var query = db.RoomInstances.Query()
                .Include(x => x.SubRoom)
                .Include(x => x.SubRoom!.Room)
                .Where(x => x.SubRoom.Room.Id == roomId);

            if (!isMod)
            {
                query = query.Where(x => x.InstanceType == RoomInstanceType.Public);
            }

            var instances = query.ToList();
            if (instances.Count == 0)
            {
                return Ok(Array.Empty<object>());
            }

            var instanceIds = instances.Select(x => x.Id).ToList();

            var presences = db.Presences.Query()
                .Include(x => x.Account)
                .Include(x => x.Instance)
                .Where(x => x.Instance != null && instanceIds.Contains(x.Instance.Id))
                .ToList();

            var playersByInstance = presences
                .Where(x => x.Instance != null && x.Account != null)
                .GroupBy(x => x.Instance!.Id)
                .ToDictionary(
                    g => g.Key,
                    g => g.Select(p => p.Account.Id).ToList()
                );

            var result = instances
            .OrderByDescending(x =>
                playersByInstance.TryGetValue(x.Id, out var ids) ? ids.Count : 0)
            .Select(x =>
            {
                var playerIds = playersByInstance.TryGetValue(x.Id, out var ids) ? ids : [];
                return MapToDictionary(x, playerIds);
            });



            return Ok(result);
        }

        #region Helpers

        private static Dictionary<string, object> MapToDictionary(RoomInstance roomInstance, List<long> playerIds)
        {
            return new Dictionary<string, object>
            {
                ["RoomInstanceId"] = roomInstance.Id,
                ["RoomId"] = roomInstance.SubRoom?.Room?.Id ?? 0,
                ["SubRoomId"] = roomInstance.SubRoom?.Id ?? 0,
                ["IsFull"] = false,
                ["CreatedAt"] = roomInstance.CreatedAt.ToString("O"),
                ["PlayerIds"] = playerIds
            };
        }

        #endregion
    }
}