using Microsoft.AspNetCore.Mvc;
using DramaLing.Api.Models.Entities;
using DramaLing.Api.Repositories;
using Microsoft.AspNetCore.Authorization;

namespace DramaLing.Api.Controllers;

[ApiController]
[Route("api/flashcards")]
[AllowAnonymous]
public class FlashcardsController : ControllerBase
{
    private readonly IFlashcardRepository _flashcardRepository;
    private readonly ILogger<FlashcardsController> _logger;

    public FlashcardsController(
        IFlashcardRepository flashcardRepository,
        ILogger<FlashcardsController> logger)
    {
        _flashcardRepository = flashcardRepository;
        _logger = logger;
    }

    private Guid GetUserId()
    {
        // 暫時使用固定測試用戶 ID
        return Guid.Parse("00000000-0000-0000-0000-000000000001");
    }

    [HttpGet]
    public async Task<ActionResult> GetFlashcards(
        [FromQuery] string? search = null,
        [FromQuery] bool favoritesOnly = false)
    {
        try
        {
            var userId = GetUserId();
            var flashcards = await _flashcardRepository.GetByUserIdAsync(userId, search, favoritesOnly);

            return Ok(new
            {
                Success = true,
                Data = new
                {
                    Flashcards = flashcards.Select(f => new
                    {
                        f.Id,
                        f.Word,
                        f.Translation,
                        f.Definition,
                        f.PartOfSpeech,
                        f.Pronunciation,
                        f.Example,
                        f.ExampleTranslation,
                        f.IsFavorite,
                        f.DifficultyLevel,
                        f.CreatedAt,
                        f.UpdatedAt
                    }),
                    Count = flashcards.Count()
                }
            });
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error getting flashcards");
            return StatusCode(500, new { Success = false, Error = "Failed to load flashcards" });
        }
    }

    [HttpPost]
    public async Task<ActionResult> CreateFlashcard([FromBody] CreateFlashcardRequest request)
    {
        try
        {
            var userId = GetUserId();

            var flashcard = new Flashcard
            {
                Id = Guid.NewGuid(),
                UserId = userId,
                Word = request.Word,
                Translation = request.Translation,
                Definition = request.Definition ?? "",
                PartOfSpeech = request.PartOfSpeech,
                Pronunciation = request.Pronunciation,
                Example = request.Example,
                ExampleTranslation = request.ExampleTranslation,
                DifficultyLevel = "A2", // 預設等級
                CreatedAt = DateTime.UtcNow,
                UpdatedAt = DateTime.UtcNow
            };

            await _flashcardRepository.AddAsync(flashcard);

            return Ok(new
            {
                Success = true,
                Data = flashcard,
                Message = "詞卡創建成功"
            });
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error creating flashcard");
            return StatusCode(500, new { Success = false, Error = "Failed to create flashcard" });
        }
    }

    [HttpGet("{id}")]
    public async Task<ActionResult> GetFlashcard(Guid id)
    {
        try
        {
            var userId = GetUserId();

            var flashcard = await _flashcardRepository.GetByUserIdAndFlashcardIdAsync(userId, id);

            if (flashcard == null)
            {
                return NotFound(new { Success = false, Error = "Flashcard not found" });
            }

            return Ok(new { Success = true, Data = flashcard });
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error getting flashcard {FlashcardId}", id);
            return StatusCode(500, new { Success = false, Error = "Failed to get flashcard" });
        }
    }

    [HttpPut("{id}")]
    public async Task<ActionResult> UpdateFlashcard(Guid id, [FromBody] CreateFlashcardRequest request)
    {
        try
        {
            var userId = GetUserId();

            var flashcard = await _flashcardRepository.GetByUserIdAndFlashcardIdAsync(userId, id);

            if (flashcard == null)
            {
                return NotFound(new { Success = false, Error = "Flashcard not found" });
            }

            // 更新詞卡資訊
            flashcard.Word = request.Word;
            flashcard.Translation = request.Translation;
            flashcard.Definition = request.Definition ?? "";
            flashcard.PartOfSpeech = request.PartOfSpeech;
            flashcard.Pronunciation = request.Pronunciation;
            flashcard.Example = request.Example;
            flashcard.ExampleTranslation = request.ExampleTranslation;
            flashcard.UpdatedAt = DateTime.UtcNow;

            await _flashcardRepository.UpdateAsync(flashcard);

            return Ok(new
            {
                Success = true,
                Data = flashcard,
                Message = "詞卡更新成功"
            });
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error updating flashcard {FlashcardId}", id);
            return StatusCode(500, new { Success = false, Error = "Failed to update flashcard" });
        }
    }

    [HttpDelete("{id}")]
    public async Task<ActionResult> DeleteFlashcard(Guid id)
    {
        try
        {
            var userId = GetUserId();

            var flashcard = await _flashcardRepository.GetByUserIdAndFlashcardIdAsync(userId, id);

            if (flashcard == null)
            {
                return NotFound(new { Success = false, Error = "Flashcard not found" });
            }

            await _flashcardRepository.DeleteAsync(flashcard);

            return Ok(new { Success = true, Message = "詞卡已刪除" });
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error deleting flashcard {FlashcardId}", id);
            return StatusCode(500, new { Success = false, Error = "Failed to delete flashcard" });
        }
    }

    [HttpPost("{id}/favorite")]
    public async Task<ActionResult> ToggleFavorite(Guid id)
    {
        try
        {
            var userId = GetUserId();

            var flashcard = await _flashcardRepository.GetByUserIdAndFlashcardIdAsync(userId, id);

            if (flashcard == null)
            {
                return NotFound(new { Success = false, Error = "Flashcard not found" });
            }

            flashcard.IsFavorite = !flashcard.IsFavorite;
            flashcard.UpdatedAt = DateTime.UtcNow;

            await _flashcardRepository.UpdateAsync(flashcard);

            return Ok(new {
                Success = true,
                IsFavorite = flashcard.IsFavorite,
                Message = flashcard.IsFavorite ? "已加入收藏" : "已取消收藏"
            });
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error toggling favorite for flashcard {FlashcardId}", id);
            return StatusCode(500, new { Success = false, Error = "Failed to toggle favorite" });
        }
    }
}

// DTO 類別
public class CreateFlashcardRequest
{
    public string Word { get; set; } = string.Empty;
    public string Translation { get; set; } = string.Empty;
    public string Definition { get; set; } = string.Empty;
    public string PartOfSpeech { get; set; } = string.Empty;
    public string Pronunciation { get; set; } = string.Empty;
    public string Example { get; set; } = string.Empty;
    public string? ExampleTranslation { get; set; }
}