using Koogle.Application.DTOs;
using Koogle.Application.Interfaces;
using Koogle.Domain.Entities;
using Koogle.Domain.Enums;
using KoogleApp.Data;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;

namespace Koogle.Application.Services;

/// <summary>
/// Service for persisting and recovering game state.
/// </summary>
public class GamePersistenceService : IGamePersistenceService
{
    private readonly IDbContextFactory<AppDbContext> _contextFactory;
    private readonly ILogger<GamePersistenceService> _logger;

    /// <summary>
    /// Initializes a new instance of the GamePersistenceService class.
    /// </summary>
    public GamePersistenceService(
        IDbContextFactory<AppDbContext> contextFactory,
        ILogger<GamePersistenceService> logger)
    {
        _contextFactory = contextFactory;
        _logger = logger;
    }

    /// <inheritdoc />
    public async Task<Guid> CreateGameAsync(CreateGameDto dto)
    {
        await using var context = await _contextFactory.CreateDbContextAsync();

        var game = new Game
        {
            Id = Guid.NewGuid(),
            DayId = dto.DayId,
            ClubId = dto.ClubId,
            GameType = dto.GameType,
            GameData = dto.InitialGameStateJson,
            Status = GameStatus.Active,
            StartedAt = DateTime.UtcNow,
            CreatedAt = DateTime.UtcNow
        };

        // Add game participants
        foreach (var playerId in dto.PlayerIds)
        {
            game.GamePersons.Add(new GamePerson
            {
                GameId = game.Id,
                PersonId = playerId,
                ClubId = dto.ClubId
            });
        }

        context.Games.Add(game);
        await context.SaveChangesAsync();

        _logger.LogInformation(
            "Game created: {GameId}, Type: {GameType}, Day: {DayId}, Players: {PlayerCount}",
            game.Id, dto.GameType, dto.DayId, dto.PlayerIds.Length);

        return game.Id;
    }

    /// <inheritdoc />
    public async Task<bool> SaveGameStateAsync(Guid gameId, string gameStateJson)
    {
        await using var context = await _contextFactory.CreateDbContextAsync();

        var game = await context.Games.FindAsync(gameId);
        if (game == null)
        {
            _logger.LogWarning("Game not found: {GameId}", gameId);
            return false;
        }

        game.GameData = gameStateJson;
        game.ModifiedAt = DateTime.UtcNow;

        try
        {
            await context.SaveChangesAsync();
            _logger.LogDebug("Game state saved: {GameId}", gameId);
            return true;
        }
        catch (DbUpdateConcurrencyException ex)
        {
            _logger.LogWarning(ex, "Concurrency conflict saving game: {GameId}", gameId);
            return false;
        }
    }

    /// <inheritdoc />
    public async Task<ActiveGameDto?> LoadActiveGameAsync(Guid dayId)
    {
        await using var context = await _contextFactory.CreateDbContextAsync();

        var game = await context.Games
            .Include(g => g.GamePersons)
            .Where(g => g.DayId == dayId && g.Status == GameStatus.Active && !g.IsDeleted)
            .FirstOrDefaultAsync();

        if (game == null)
        {
            _logger.LogDebug("No active game found for day: {DayId}", dayId);
            return null;
        }

        _logger.LogInformation(
            "Active game loaded: {GameId}, Type: {GameType}",
            game.Id, game.GameType);

        return new ActiveGameDto
        {
            Id = game.Id,
            DayId = game.DayId,
            GameType = game.GameType,
            StartedAt = game.StartedAt,
            PlayerIds = game.GamePersons.Select(gp => gp.PersonId).ToArray(),
            GameStateJson = game.GameData
        };
    }

    /// <inheritdoc />
    public async Task EndGameAsync(Guid gameId, GameStatus status)
    {
        if (status == GameStatus.Active)
        {
            throw new ArgumentException("Cannot end game with Active status", nameof(status));
        }

        await using var context = await _contextFactory.CreateDbContextAsync();

        var game = await context.Games.FindAsync(gameId);
        if (game == null)
        {
            _logger.LogWarning("Game not found for ending: {GameId}", gameId);
            return;
        }

        game.Status = status;
        game.CompletedAt = DateTime.UtcNow;
        game.ModifiedAt = DateTime.UtcNow;

        await context.SaveChangesAsync();

        _logger.LogInformation(
            "Game ended: {GameId}, Status: {Status}",
            gameId, status);
    }

    /// <inheritdoc />
    public async Task<IReadOnlyList<GameSummaryDto>> GetCompletedGamesAsync(Guid dayId)
    {
        await using var context = await _contextFactory.CreateDbContextAsync();

        var games = await context.Games
            .Include(g => g.GamePersons)
            .Where(g => g.DayId == dayId && g.Status != GameStatus.Active && !g.IsDeleted)
            .OrderByDescending(g => g.CompletedAt)
            .ToListAsync();

        return games.Select(g => new GameSummaryDto
        {
            Id = g.Id,
            GameTypeName = g.GameType,
            Status = g.Status,
            StartedAt = g.StartedAt,
            CompletedAt = g.CompletedAt,
            ParticipantCount = g.GamePersons.Count
        }).ToList();
    }
}