using Service.AI;
using Service.Transaction;

namespace WebApi.Controllers;

[ApiController]
[Route("api/[controller]/[action]")]
public class TransactionRecordController(
    ITransactionRecordRepository transactionRepository,
    ITransactionStatisticsService transactionStatisticsService,
    ISmartHandleService smartHandleService,
    ILogger<TransactionRecordController> logger,
    IConfigService configService
) : ControllerBase
{
    /// <summary>
    /// 获取交易记录列表（分页）
    /// </summary>
    [HttpGet]
    public async Task<PagedResponse<TransactionRecord>> GetListAsync(
        [FromQuery] int pageIndex = 1,
        [FromQuery] int pageSize = 20,
        [FromQuery] string? searchKeyword = null,
        [FromQuery] string? classify = null,
        [FromQuery] int? type = null,
        [FromQuery] int? year = null,
        [FromQuery] int? month = null,
        [FromQuery] DateTime? startDate = null,
        [FromQuery] DateTime? endDate = null,
        [FromQuery] string? reason = null,
        [FromQuery] bool sortByAmount = false
    )
    {
        try
        {
            var classifies = string.IsNullOrWhiteSpace(classify)
                ? null
                : classify.Split(',', StringSplitOptions.RemoveEmptyEntries);

            TransactionType? transactionType = type.HasValue ? (TransactionType)type.Value : null;
            var list = await transactionRepository.QueryAsync(
                            year: year,
                            month: month,
                            startDate: startDate,
                            endDate: endDate,
                            type: transactionType,
                            classifies: classifies,
                            searchKeyword: searchKeyword,
                            reason: reason,
                            pageIndex: pageIndex,
                            pageSize: pageSize,
                            sortByAmount: sortByAmount);
            var total = await transactionRepository.CountAsync(
                year: year,
                month: month,
                startDate: startDate,
                endDate: endDate,
                type: transactionType,
                classifies: classifies,
                searchKeyword: searchKeyword,
                reason: reason);

            return new PagedResponse<TransactionRecord>
            {
                Success = true,
                Data = list.ToArray(),
                Total = (int)total
            };
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "获取交易记录列表失败，页码: {PageIndex}, 页大小: {PageSize}", pageIndex, pageSize);
            return PagedResponse<TransactionRecord>.Fail($"获取交易记录列表失败: {ex.Message}");
        }
    }

    /// <summary>
    /// 获取待确认分类的交易记录列表
    /// </summary>
    [HttpGet]
    public async Task<BaseResponse<List<TransactionRecord>>> GetUnconfirmedListAsync()
    {
        try
        {
            var list = await transactionRepository.GetUnconfirmedRecordsAsync();
            return list.Ok();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "获取待确认分类交易列表失败");
            return $"获取待确认分类交易列表失败: {ex.Message}".Fail<List<TransactionRecord>>();
        }
    }

    /// <summary>
    /// 全部确认待确认的交易分类
    /// </summary>
    [HttpPost]
    public async Task<BaseResponse<int>> ConfirmAllUnconfirmedAsync([FromBody] ConfirmAllUnconfirmedRequestDto request)
    {
        try
        {
            var count = await transactionRepository.ConfirmAllUnconfirmedAsync(request.Ids);
            return count.Ok();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "全部确认待确认分类失败");
            return $"全部确认待确认分类失败: {ex.Message}".Fail<int>();
        }
    }

    /// <summary>
    /// 根据ID获取交易记录详情
    /// </summary>
    [HttpGet("{id}")]
    public async Task<BaseResponse<TransactionRecord>> GetByIdAsync(long id)
    {
        try
        {
            var transaction = await transactionRepository.GetByIdAsync(id);
            if (transaction == null)
            {
                return "交易记录不存在".Fail<TransactionRecord>();
            }

            return transaction.Ok();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "获取交易记录详情失败，交易ID: {TransactionId}", id);
            return $"获取交易记录详情失败: {ex.Message}".Fail<TransactionRecord>();
        }
    }

    /// <summary>
    /// 根据邮件ID获取交易记录列表
    /// </summary>
    [HttpGet("{emailId}")]
    public async Task<BaseResponse<List<TransactionRecord>>> GetByEmailIdAsync(long emailId)
    {
        try
        {
            var transactions = await transactionRepository.GetByEmailIdAsync(emailId);
            return transactions.Ok();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "获取邮件交易记录失败，邮件ID: {EmailId}", emailId);
            return $"获取邮件交易记录失败: {ex.Message}".Fail<List<TransactionRecord>>();
        }
    }

    /// <summary>
    /// 创建交易记录
    /// </summary>
    [HttpPost]
    public async Task<BaseResponse> CreateAsync([FromBody] CreateTransactionDto dto)
    {
        try
        {
            // 解析日期字符串
            if (!DateTime.TryParse(dto.OccurredAt, out var occurredAt))
            {
                return "交易时间格式不正确".Fail();
            }

            var transaction = new TransactionRecord
            {
                OccurredAt = occurredAt,
                Reason = dto.Reason ?? string.Empty,
                Amount = dto.Amount,
                Type = dto.Type,
                Classify = dto.Classify ?? string.Empty,
                ImportFrom = "手动录入",
                ImportNo = Guid.NewGuid().ToString("N"),
                Card = "手动",
                EmailMessageId = 0 // 手动录入的记录，EmailMessageId 设为 0
            };

            var result = await transactionRepository.AddAsync(transaction);
            if (result)
            {
                return BaseResponse.Done();
            }

            return "创建交易记录失败".Fail();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "创建交易记录失败，交易信息: {@TransactionDto}", dto);
            return $"创建交易记录失败: {ex.Message}".Fail();
        }
    }

    /// <summary>
    /// 更新交易记录
    /// </summary>
    [HttpPost]
    public async Task<BaseResponse> UpdateAsync([FromBody] UpdateTransactionDto dto)
    {
        try
        {
            var transaction = await transactionRepository.GetByIdAsync(dto.Id);
            if (transaction == null)
            {
                return "交易记录不存在".Fail();
            }

            // 更新可编辑字段
            transaction.Reason = dto.Reason ?? string.Empty;
            transaction.Amount = dto.Amount;
            transaction.Balance = dto.Balance;
            transaction.Type = dto.Type;
            transaction.Classify = dto.Classify ?? string.Empty;

            // 更新交易时间
            if (!string.IsNullOrEmpty(dto.OccurredAt) && DateTime.TryParse(dto.OccurredAt, out var occurredAt))
            {
                transaction.OccurredAt = occurredAt;
            }

            // 清除待确认状态
            transaction.UnconfirmedClassify = null;
            transaction.UnconfirmedType = null;

            var success = await transactionRepository.UpdateAsync(transaction);
            if (success)
            {
                return BaseResponse.Done();
            }

            return "更新交易记录失败".Fail();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "更新交易记录失败，交易ID: {TransactionId}, 交易信息: {@TransactionDto}", dto.Id, dto);
            return $"更新交易记录失败: {ex.Message}".Fail();
        }
    }

    /// <summary>
    /// 删除交易记录
    /// </summary>
    [HttpPost]
    public async Task<BaseResponse> DeleteByIdAsync([FromQuery] long id)
    {
        try
        {
            var success = await transactionRepository.DeleteAsync(id);
            if (success)
            {
                return BaseResponse.Done();
            }

            return "删除交易记录失败，记录不存在".Fail();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "删除交易记录失败，交易ID: {TransactionId}", id);
            return $"删除交易记录失败: {ex.Message}".Fail();
        }
    }

    /// <summary>
    /// 获取累积余额统计数据（用于余额卡片图表）
    /// </summary>
    [HttpGet]
    public async Task<BaseResponse<List<BalanceStatisticsDto>>> GetBalanceStatisticsAsync(
        [FromQuery] int year,
        [FromQuery] int month
    )
    {
        try
        {
            // 获取存款分类
            var savingClassify = await configService.GetConfigByKeyAsync<string>("SavingsCategories");

            // 获取每日统计数据
            var statistics = await transactionStatisticsService.GetDailyStatisticsAsync(year, month, savingClassify);

            // 按日期排序并计算累积余额
            var sortedStats = statistics.OrderBy(s => s.Key).ToList();
            var result = new List<BalanceStatisticsDto>();
            decimal cumulativeBalance = 0;

            foreach (var item in sortedStats)
            {
                var dailyBalance = item.Value.income - item.Value.expense;
                cumulativeBalance += dailyBalance;

                result.Add(new BalanceStatisticsDto(
                    item.Key,
                    cumulativeBalance
                ));
            }

            return result.Ok();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "获取累积余额统计失败，年份: {Year}, 月份: {Month}", year, month);
            return $"获取累积余额统计失败: {ex.Message}".Fail<List<BalanceStatisticsDto>>();
        }
    }

    /// <summary>
    /// 获取指定月份每天的消费统计
    /// </summary>
    [HttpGet]
    public async Task<BaseResponse<List<DailyStatisticsDto>>> GetDailyStatisticsAsync(
        [FromQuery] int year,
        [FromQuery] int month
    )
    {
        try
        {
            // 获取存款分类
            var savingClassify = await configService.GetConfigByKeyAsync<string>("SavingsCategories");

            var statistics = await transactionStatisticsService.GetDailyStatisticsAsync(year, month, savingClassify);
            var result = statistics.Select(s => new DailyStatisticsDto(
                s.Key,
                s.Value.count,
                s.Value.expense,
                s.Value.income,
                s.Value.saving
            )).ToList();

            return result.Ok();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "获取日历统计数据失败，年份: {Year}, 月份: {Month}", year, month);
            return $"获取日历统计数据失败: {ex.Message}".Fail<List<DailyStatisticsDto>>();
        }
    }



    /// <summary>
    /// 获取月度统计数据
    /// </summary>
    [HttpGet]
    public async Task<BaseResponse<MonthlyStatistics>> GetMonthlyStatisticsAsync(
        [FromQuery] int year,
        [FromQuery] int month
    )
    {
        try
        {
            var statistics = await transactionStatisticsService.GetMonthlyStatisticsAsync(year, month);
            return statistics.Ok();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "获取月度统计数据失败，年份: {Year}, 月份: {Month}", year, month);
            return $"获取月度统计数据失败: {ex.Message}".Fail<MonthlyStatistics>();
        }
    }

    /// <summary>
    /// 获取分类统计数据
    /// </summary>
    [HttpGet]
    public async Task<BaseResponse<List<CategoryStatistics>>> GetCategoryStatisticsAsync(
        [FromQuery] int year,
        [FromQuery] int month,
        [FromQuery] TransactionType type
    )
    {
        try
        {
            var statistics = await transactionStatisticsService.GetCategoryStatisticsAsync(year, month, type);
            return statistics.Ok();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "获取分类统计数据失败，年份: {Year}, 月份: {Month}, 类型: {Type}", year, month, type);
            return $"获取分类统计数据失败: {ex.Message}".Fail<List<CategoryStatistics>>();
        }
    }

    /// <summary>
    /// 获取趋势统计数据
    /// </summary>
    [HttpGet]
    public async Task<BaseResponse<List<TrendStatistics>>> GetTrendStatisticsAsync(
        [FromQuery] int startYear,
        [FromQuery] int startMonth,
        [FromQuery] int monthCount = 6
    )
    {
        try
        {
            var statistics = await transactionStatisticsService.GetTrendStatisticsAsync(startYear, startMonth, monthCount);
            return statistics.Ok();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "获取趋势统计数据失败，开始年份: {Year}, 开始月份: {Month}, 月份数: {Count}", startYear, startMonth,
                monthCount);
            return $"获取趋势统计数据失败: {ex.Message}".Fail<List<TrendStatistics>>();
        }
    }

    /// <summary>
    /// 智能分析账单（流式输出）
    /// </summary>
    public async Task AnalyzeBillAsync([FromBody] BillAnalysisRequest request)
    {
        Response.ContentType = "text/event-stream";
        Response.Headers.Append("Cache-Control", "no-cache");
        Response.Headers.Append("Connection", "keep-alive");

        if (string.IsNullOrWhiteSpace(request.UserInput))
        {
            await WriteEventAsync("<div class='error-message'>请输入分析内容</div>");
            return;
        }

        await smartHandleService.AnalyzeBillAsync(request.UserInput, async void (chunk) =>
        {
            try
            {
                await WriteEventAsync(chunk);
            }
            catch (Exception e)
            {
                logger.LogError(e, "流式写入账单分析结果失败");
            }
        });
    }

    /// <summary>
    /// 获取指定日期的交易记录
    /// </summary>
    [HttpGet]
    public async Task<BaseResponse<List<TransactionRecord>>> GetByDateAsync([FromQuery] string date)
    {
        try
        {
            if (!DateTime.TryParse(date, out var targetDate))
            {
                return "日期格式不正确".Fail<List<TransactionRecord>>();
            }

            // 获取当天的开始和结束时间
            var startDate = targetDate.Date;
            var endDate = startDate.AddDays(1);

            var records = await transactionRepository.QueryAsync(startDate: startDate, endDate: endDate);

            return records.Ok();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "获取指定日期的交易记录失败，日期: {Date}", date);
            return $"获取指定日期的交易记录失败: {ex.Message}".Fail<List<TransactionRecord>>();
        }
    }

    /// <summary>
    /// 获取未分类的账单数量
    /// </summary>
    [HttpGet]
    public async Task<BaseResponse<int>> GetUnclassifiedCountAsync()
    {
        try
        {
            var count = (int)await transactionRepository.CountAsync();
            return count.Ok();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "获取未分类账单数量失败");
            return $"获取未分类账单数量失败: {ex.Message}".Fail<int>();
        }
    }

    /// <summary>
    /// 获取未分类的账单列表
    /// </summary>
    [HttpGet]
    public async Task<BaseResponse<List<TransactionRecord>>> GetUnclassifiedAsync([FromQuery] int pageSize = 10)
    {
        try
        {
            var records = await transactionRepository.GetUnclassifiedAsync(pageSize);
            return records.Ok();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "获取未分类账单列表失败");
            return $"获取未分类账单列表失败: {ex.Message}".Fail<List<TransactionRecord>>();
        }
    }

    /// <summary>
    /// 智能分类 - 使用AI对账单进行分类（流式响应）
    /// </summary>
    [HttpPost]
    public async Task SmartClassifyAsync([FromBody] SmartClassifyRequest request)
    {
        Response.ContentType = "text/event-stream";
        Response.Headers.Append("Cache-Control", "no-cache");
        Response.Headers.Append("Connection", "keep-alive");

        // 验证账单ID列表
        if (request.TransactionIds == null || request.TransactionIds.Count == 0)
        {
            await WriteEventAsync("error", "请提供要分类的账单ID");
            return;
        }

        await smartHandleService.SmartClassifyAsync(request.TransactionIds.ToArray(), async void (chunk) =>
        {
            try
            {
                var (eventType, content) = chunk;
                await TrySetUnconfirmedAsync(eventType, content);
                await WriteEventAsync(eventType, content);
            }
            catch (Exception e)
            {
                logger.LogError(e, "流式写入智能分类结果失败");
            }
        });

        await Response.Body.FlushAsync();
    }

    private async Task TrySetUnconfirmedAsync(string eventType, string content)
    {
        if (eventType != "data")
        {
            return;
        }

        try
        {
            var jsonObject = JsonSerializer.Deserialize<JsonObject>(content);
            var id = jsonObject?["id"]?.GetValue<long>() ?? 0;
            var classify = jsonObject?["Classify"]?.GetValue<string>() ?? string.Empty;
            var typeValue = jsonObject?["Type"]?.GetValue<int>() ?? -1;

            if (id == 0 || typeValue == -1 || string.IsNullOrEmpty(classify))
            {
                logger.LogWarning("解析智能分类结果时，发现无效数据，内容: {Content}", content);
                return;
            }

            var record = await transactionRepository.GetByIdAsync(id);
            if (record == null)
            {
                logger.LogWarning("解析智能分类结果时，未找到对应的交易记录，ID: {Id}", id);
                return;
            }

            record.UnconfirmedClassify = classify;
            record.UnconfirmedType = (TransactionType)typeValue;

            var success = await transactionRepository.UpdateAsync(record);

            if (!success)
            {
                logger.LogWarning("解析智能分类结果时，更新交易记录失败，ID: {Id}", id);
            }
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "解析智能分类结果失败，内容: {Content}", content);
        }
    }

    /// <summary>
    /// 批量更新账单分类
    /// </summary>
    [HttpPost]
    public async Task<BaseResponse> BatchUpdateClassifyAsync([FromBody] List<BatchUpdateClassifyItem> items)
    {
        try
        {
            var successCount = 0;
            var failCount = 0;

            foreach (var item in items)
            {
                var record = await transactionRepository.GetByIdAsync(item.Id);
                if (record != null)
                {
                    record.Classify = item.Classify ?? string.Empty;
                    // 如果提供了Type，也更新Type
                    if (item.Type.HasValue)
                    {
                        record.Type = item.Type.Value;
                    }

                    if (!string.IsNullOrEmpty(record.Classify))
                    {
                        record.UnconfirmedClassify = null;
                    }

                    if (record.Type == item.Type)
                    {
                        record.UnconfirmedType = TransactionType.None;
                    }

                    var success = await transactionRepository.UpdateAsync(record);
                    if (success)
                        successCount++;
                    else
                        failCount++;
                }
                else
                {
                    failCount++;
                }
            }

            return $"批量更新完成，成功 {successCount} 条，失败 {failCount} 条".Ok();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "批量更新分类失败");
            return $"批量更新分类失败: {ex.Message}".Fail();
        }
    }

    /// <summary>
    /// 获取按交易摘要分组的统计信息（支持分页）
    /// </summary>
    [HttpGet]
    public async Task<PagedResponse<ReasonGroupDto>> GetReasonGroupsAsync(
        [FromQuery] int pageIndex = 1,
        [FromQuery] int pageSize = 20)
    {
        try
        {
            var (list, total) = await transactionStatisticsService.GetReasonGroupsAsync(pageIndex, pageSize);
            return new PagedResponse<ReasonGroupDto>
            {
                Success = true,
                Data = list.ToArray(),
                Total = total
            };
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "获取交易摘要分组失败");
            return PagedResponse<ReasonGroupDto>.Fail($"获取交易摘要分组失败: {ex.Message}");
        }
    }

    /// <summary>
    /// 按摘要批量更新分类
    /// </summary>
    [HttpPost]
    public async Task<BaseResponse<int>> BatchUpdateByReasonAsync([FromBody] BatchUpdateByReasonDto dto)
    {
        try
        {
            var count = await transactionRepository.BatchUpdateByReasonAsync(dto.Reason, dto.Type, dto.Classify);
            return count.Ok($"成功更新 {count} 条记录");
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "按摘要批量更新分类失败，摘要: {Reason}", dto.Reason);
            return $"按摘要批量更新分类失败: {ex.Message}".Fail<int>();
        }
    }

    /// <summary>
    /// 一句话录账解析
    /// </summary>
    [HttpPost]
    public async Task<BaseResponse<TransactionParseResult>> ParseOneLine([FromBody] ParseOneLineRequestDto request)
    {
        if (string.IsNullOrEmpty(request.Text))
        {
            return "请求参数缺失：text".Fail<TransactionParseResult>();
        }

        try
        {
            var result = await smartHandleService.ParseOneLineBillAsync(request.Text);

            if (result == null)
            {
                return "AI解析失败".Fail<TransactionParseResult>();
            }

            return result.Ok();
        }
        catch (Exception ex)
        {
            logger.LogError(ex, "一句话录账解析失败，文本: {Text}", request.Text);
            return ("AI解析失败: " + ex.Message).Fail<TransactionParseResult>();
        }
    }

    private async Task WriteEventAsync(string eventType, string data)
    {
        var message = $"event: {eventType}\ndata: {data}\n\n";
        await Response.WriteAsync(message);
        await Response.Body.FlushAsync();
    }

    private async Task WriteEventAsync(string data)
    {
        var message = $"data: {data}\n\n";
        await Response.WriteAsync(message);
        await Response.Body.FlushAsync();
    }
}

/// <summary>
/// 创建交易记录DTO
/// </summary>
public record CreateTransactionDto(
    string OccurredAt,
    string? Reason,
    decimal Amount,
    TransactionType Type,
    string? Classify
);

/// <summary>
/// 更新交易记录DTO
/// </summary>
public record UpdateTransactionDto(
    long Id,
    string? Reason,
    decimal Amount,
    decimal Balance,
    TransactionType Type,
    string? Classify,
    string? OccurredAt = null
);

/// <summary>
/// 日历统计响应DTO
/// </summary>
public record DailyStatisticsDto(
    string Date,
    int Count,
    decimal Expense,
    decimal Income,
    decimal Balance
);

/// <summary>
/// 累积余额统计DTO
/// </summary>
public record BalanceStatisticsDto(
    string Date,
    decimal CumulativeBalance
);

/// <summary>
/// 智能分类请求DTO
/// </summary>
public record SmartClassifyRequest(
    List<long>? TransactionIds = null
);

/// <summary>
/// 批量更新分类项DTO
/// </summary>
public record BatchUpdateClassifyItem(
    long Id,
    string? Classify,
    TransactionType? Type = null
);

/// <summary>
/// 按摘要批量更新DTO
/// </summary>
public record BatchUpdateByReasonDto(
    string Reason,
    TransactionType Type,
    string Classify
);

/// <summary>
/// 账单分析请求DTO
/// </summary>
public record BillAnalysisRequest(
    string UserInput
 );

public record ParseOneLineRequestDto(
    string Text
);

public record ConfirmAllUnconfirmedRequestDto(
    long[] Ids
);