using Application.Dto.Periodic;
using Service.Transaction;

namespace Application;

/// <summary>
/// 周期性账单应用服务接口
/// </summary>
public interface ITransactionPeriodicApplication
{
    /// <summary>
    /// 获取周期性账单列表（分页）
    /// </summary>
    Task<PeriodicPagedResult> GetListAsync(int pageIndex = 1, int pageSize = 20, string? searchKeyword = null);

    /// <summary>
    /// 根据ID获取周期性账单详情
    /// </summary>
    Task<PeriodicResponse> GetByIdAsync(long id);

    /// <summary>
    /// 创建周期性账单
    /// </summary>
    Task<PeriodicResponse> CreateAsync(CreatePeriodicRequest request);

    /// <summary>
    /// 更新周期性账单
    /// </summary>
    Task UpdateAsync(UpdatePeriodicRequest request);

    /// <summary>
    /// 删除周期性账单
    /// </summary>
    Task DeleteByIdAsync(long id);

    /// <summary>
    /// 启用/禁用周期性账单
    /// </summary>
    Task ToggleEnabledAsync(long id, bool enabled);
}

/// <summary>
/// 周期性账单应用服务实现
/// </summary>
public class TransactionPeriodicApplication(
    ITransactionPeriodicRepository periodicRepository,
    ITransactionPeriodicService periodicService
) : ITransactionPeriodicApplication
{
    public async Task<PeriodicPagedResult> GetListAsync(int pageIndex = 1, int pageSize = 20, string? searchKeyword = null)
    {
        var list = await periodicRepository.GetPagedListAsync(pageIndex, pageSize, searchKeyword);
        var total = await periodicRepository.GetTotalCountAsync(searchKeyword);

        return new PeriodicPagedResult
        {
            Data = list.Select(MapToResponse).ToArray(),
            Total = (int)total
        };
    }

    public async Task<PeriodicResponse> GetByIdAsync(long id)
    {
        var periodic = await periodicRepository.GetByIdAsync(id);
        if (periodic == null)
        {
            throw new NotFoundException("周期性账单不存在");
        }

        return MapToResponse(periodic);
    }

    public async Task<PeriodicResponse> CreateAsync(CreatePeriodicRequest request)
    {
        var periodic = new TransactionPeriodic
        {
            PeriodicType = request.PeriodicType,
            PeriodicConfig = request.PeriodicConfig ?? string.Empty,
            Amount = request.Amount,
            Type = request.Type,
            Classify = request.Classify ?? string.Empty,
            Reason = request.Reason ?? string.Empty,
            IsEnabled = true
        };

        // 计算下次执行时间
        periodic.NextExecuteTime = periodicService.CalculateNextExecuteTime(periodic, DateTime.Now);

        var success = await periodicRepository.AddAsync(periodic);
        if (!success)
        {
            throw new BusinessException("创建周期性账单失败");
        }

        return MapToResponse(periodic);
    }

    public async Task UpdateAsync(UpdatePeriodicRequest request)
    {
        var periodic = await periodicRepository.GetByIdAsync(request.Id);
        if (periodic == null)
        {
            throw new NotFoundException("周期性账单不存在");
        }

        periodic.PeriodicType = request.PeriodicType;
        periodic.PeriodicConfig = request.PeriodicConfig ?? string.Empty;
        periodic.Amount = request.Amount;
        periodic.Type = request.Type;
        periodic.Classify = request.Classify ?? string.Empty;
        periodic.Reason = request.Reason ?? string.Empty;
        periodic.IsEnabled = request.IsEnabled;
        periodic.UpdateTime = DateTime.Now;

        // 重新计算下次执行时间
        periodic.NextExecuteTime = periodicService.CalculateNextExecuteTime(periodic, DateTime.Now);

        var success = await periodicRepository.UpdateAsync(periodic);
        if (!success)
        {
            throw new BusinessException("更新周期性账单失败");
        }
    }

    public async Task DeleteByIdAsync(long id)
    {
        var success = await periodicRepository.DeleteAsync(id);
        if (!success)
        {
            throw new BusinessException("删除周期性账单失败");
        }
    }

    public async Task ToggleEnabledAsync(long id, bool enabled)
    {
        var periodic = await periodicRepository.GetByIdAsync(id);
        if (periodic == null)
        {
            throw new NotFoundException("周期性账单不存在");
        }

        periodic.IsEnabled = enabled;
        periodic.UpdateTime = DateTime.Now;

        var success = await periodicRepository.UpdateAsync(periodic);
        if (!success)
        {
            throw new BusinessException("操作失败");
        }
    }

    private static PeriodicResponse MapToResponse(TransactionPeriodic periodic)
    {
        return new PeriodicResponse
        {
            Id = periodic.Id,
            PeriodicType = periodic.PeriodicType,
            PeriodicConfig = periodic.PeriodicConfig,
            Amount = periodic.Amount,
            Type = periodic.Type,
            Classify = periodic.Classify,
            Reason = periodic.Reason,
            IsEnabled = periodic.IsEnabled,
            NextExecuteTime = periodic.NextExecuteTime,
            CreateTime = periodic.CreateTime,
            UpdateTime = periodic.UpdateTime
        };
    }
}