namespace Repository;

public interface ITransactionRecordRepository : IBaseRepository<TransactionRecord>
{
    Task<TransactionRecord?> ExistsByEmailMessageIdAsync(long emailMessageId, DateTime occurredAt);

    Task<TransactionRecord?> ExistsByImportNoAsync(string importNo, string importFrom);

    /// <summary>
    /// 分页获取交易记录列表（游标分页）
    /// </summary>
    /// <param name="lastOccurredAt">上一页最后一条记录的发生时间</param>
    /// <param name="lastId">上一页最后一条记录的ID</param>
    /// <param name="pageSize">每页数量</param>
    /// <param name="searchKeyword">搜索关键词（搜索交易摘要和分类）</param>
    /// <returns>交易记录列表、最后发生时间和最后ID</returns>
    Task<(List<TransactionRecord> list, DateTime? lastOccurredAt, long lastId)> GetPagedListAsync(DateTime? lastOccurredAt, long? lastId, int pageSize = 20, string? searchKeyword = null);

    /// <summary>
    /// 获取总数
    /// </summary>
    Task<long> GetTotalCountAsync();

    /// <summary>
    /// 获取所有不同的交易分类
    /// </summary>
    Task<List<string>> GetDistinctClassifyAsync();

    /// <summary>
    /// 获取所有不同的交易子分类
    /// </summary>
    Task<List<string>> GetDistinctSubClassifyAsync();

    /// <summary>
    /// 获取指定月份每天的消费统计
    /// </summary>
    /// <param name="year">年份</param>
    /// <param name="month">月份</param>
    /// <returns>每天的消费笔数和金额</returns>
    Task<Dictionary<string, (int count, decimal amount)>> GetDailyStatisticsAsync(int year, int month);

    /// <summary>
    /// 获取指定日期范围内的交易记录
    /// </summary>
    /// <param name="startDate">开始日期</param>
    /// <param name="endDate">结束日期</param>
    /// <returns>交易记录列表</returns>
    Task<List<TransactionRecord>> GetByDateRangeAsync(DateTime startDate, DateTime endDate);

    /// <summary>
    /// 获取指定邮件的交易记录数量
    /// </summary>
    /// <param name="emailMessageId">邮件ID</param>
    /// <returns>交易记录数量</returns>
    Task<int> GetCountByEmailIdAsync(long emailMessageId);

    /// <summary>
    /// 获取指定邮件的交易记录列表
    /// </summary>
    /// <param name="emailMessageId">邮件ID</param>
    /// <returns>交易记录列表</returns>
    Task<List<TransactionRecord>> GetByEmailIdAsync(long emailMessageId);
}

public class TransactionRecordRepository(IFreeSql freeSql) : BaseRepository<TransactionRecord>(freeSql), ITransactionRecordRepository
{
    public async Task<TransactionRecord?> ExistsByEmailMessageIdAsync(long emailMessageId, DateTime occurredAt)
    {
        return await FreeSql.Select<TransactionRecord>()
            .Where(t => t.EmailMessageId == emailMessageId && t.OccurredAt == occurredAt)
            .FirstAsync();
    }

    public async Task<TransactionRecord?> ExistsByImportNoAsync(string importNo, string importFrom)
    {
        return await FreeSql.Select<TransactionRecord>()
            .Where(t => t.ImportNo == importNo && t.ImportFrom == importFrom)
            .FirstAsync();
    }

    public async Task<(List<TransactionRecord> list, DateTime? lastOccurredAt, long lastId)> GetPagedListAsync(DateTime? lastOccurredAt, long? lastId, int pageSize = 20, string? searchKeyword = null)
    {
        var query = FreeSql.Select<TransactionRecord>();

        // 如果提供了搜索关键词，则添加搜索条件
        if (!string.IsNullOrWhiteSpace(searchKeyword))
        {
            query = query.Where(t => t.Reason.Contains(searchKeyword) ||
                                     t.Classify.Contains(searchKeyword) ||
                                     t.SubClassify.Contains(searchKeyword) ||
                                     t.Card.Contains(searchKeyword) ||
                                     t.ImportFrom.Contains(searchKeyword));
        }

        // 如果提供了游标，则获取小于游标位置的记录
        if (lastOccurredAt.HasValue && lastId.HasValue)
        {
            query = query.Where(t => t.OccurredAt < lastOccurredAt.Value ||
                                     (t.OccurredAt == lastOccurredAt.Value && t.Id < lastId.Value));
        }

        var list = await query
            .OrderByDescending(t => t.OccurredAt)
            .OrderByDescending(t => t.Id)
            .Page(1, pageSize)
            .ToListAsync();

        var lastRecord = list.Count > 0 ? list.Last() : null;
        return (list, lastRecord?.OccurredAt, lastRecord?.Id ?? 0);
    }

    public async Task<long> GetTotalCountAsync()
    {
        return await FreeSql.Select<TransactionRecord>().CountAsync();
    }

    public async Task<List<string>> GetDistinctClassifyAsync()
    {
        return await FreeSql.Select<TransactionRecord>()
            .Where(t => !string.IsNullOrEmpty(t.Classify))
            .Distinct()
            .ToListAsync(t => t.Classify);
    }

    public async Task<List<string>> GetDistinctSubClassifyAsync()
    {
        return await FreeSql.Select<TransactionRecord>()
            .Where(t => !string.IsNullOrEmpty(t.SubClassify))
            .Distinct()
            .ToListAsync(t => t.SubClassify);
    }

    public async Task<Dictionary<string, (int count, decimal amount)>> GetDailyStatisticsAsync(int year, int month)
    {
        var startDate = new DateTime(year, month, 1);
        var endDate = startDate.AddMonths(1);

        var records = await FreeSql.Select<TransactionRecord>()
            .Where(t => t.OccurredAt >= startDate && t.OccurredAt < endDate)
            .Where(t => t.Type == TransactionType.Expense || t.Type == TransactionType.Income) // 统计消费和收入
            .ToListAsync();

        var statistics = records
            .GroupBy(t => t.OccurredAt.ToString("yyyy-MM-dd"))
            .ToDictionary(
                g => g.Key,
                g =>
                {
                    // 分别统计收入和支出
                    var income = g.Where(t => t.Type == TransactionType.Income).Sum(t => t.Amount);
                    var expense = g.Where(t => t.Type == TransactionType.Expense).Sum(t => t.Amount);
                    // 净额 = 收入 - 支出（消费大于收入时为负数）
                    var netAmount = income - expense;
                    return (count: g.Count(), amount: netAmount);
                }
            );

        return statistics;
    }

    public async Task<List<TransactionRecord>> GetByDateRangeAsync(DateTime startDate, DateTime endDate)
    {
        return await FreeSql.Select<TransactionRecord>()
            .Where(t => t.OccurredAt >= startDate && t.OccurredAt <= endDate)
            .OrderBy(t => t.OccurredAt)
            .ToListAsync();
    }

    public async Task<int> GetCountByEmailIdAsync(long emailMessageId)
    {
        return (int)await FreeSql.Select<TransactionRecord>()
            .Where(t => t.EmailMessageId == emailMessageId)
            .CountAsync();
    }

    public async Task<List<TransactionRecord>> GetByEmailIdAsync(long emailMessageId)
    {
        return await FreeSql.Select<TransactionRecord>()
            .Where(t => t.EmailMessageId == emailMessageId)
            .OrderBy(t => t.OccurredAt)
            .ToListAsync();
    }
}