using YD_Event.Application.Refund.Dtos;
using YD_Event.Core.Entities;

namespace YD_Event.Application.Refund;

/// <summary>
/// 退款配置服务
/// </summary>
public class RefundConfigService : BaseService<RefundConfig>, ITransient
{
    private readonly ISqlSugarRepository<RefundConfig> _repository;
    private readonly IIdGenerator _idGenerator;
    private readonly IEasyCachingProvider _easyCachingProvider;
    private const string CacheKey = "RefundConfig:List";

    public RefundConfigService(ISqlSugarRepository<RefundConfig> repository, 
        IIdGenerator idGenerator,
        IEasyCachingProvider easyCachingProvider) : base(repository)
    {
        _repository = repository;
        _idGenerator = idGenerator;
        _easyCachingProvider = easyCachingProvider;
    }

    /// <summary>
    /// 获取所有退款配置
    /// </summary>
    /// <returns></returns>
    [DisplayName("获取所有退款配置")]
    [HttpGet("list")]
    public async Task<List<RefundConfigDto>> GetList()
    {
        // 优先从缓存获取
        var cacheValue = await _easyCachingProvider.GetAsync<List<RefundConfigDto>>(CacheKey);
        if (cacheValue.HasValue)
        {
            return cacheValue.Value;
        }

        var list = await _repository.GetListAsync();
        var dtos = list.OrderBy(x => x.DayStart).Adapt<List<RefundConfigDto>>();
        
        // 写入缓存，过期时间 1 小时
        await _easyCachingProvider.SetAsync(CacheKey, dtos, TimeSpan.FromHours(1));
        
        return dtos;
    }

    /// <summary>
    /// 分页查询退款配置
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    [DisplayName("分页查询退款配置")]
    [HttpGet("page")]
    public async Task<PageResult<RefundConfigDto>> Page([FromQuery] RefundConfigQueryInput input)
    {
        return await _repository.AsQueryable()
            .WhereIF(input.Status.HasValue, x => x.Status == input.Status)
            .OrderBy(x => x.DayStart)
            .Select(x => new RefundConfigDto
            {
                Id = x.Id,
                DayStart = x.DayStart,
                DayEnd = x.DayEnd,
                DeductPercentage = x.DeductPercentage,
                Remark = x.Remark,
                Status = x.Status
            })
            .ToPagedListAsync(input);
    }

    /// <summary>
    /// 添加退款配置
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    [DisplayName("添加退款配置")]
    [HttpPost("add")]
    public async Task Add(RefundConfigInput input)
    {
        // 简单重叠校验
        var isExist = await _repository.IsAnyAsync(x => 
            (input.DayStart >= x.DayStart && input.DayStart < x.DayEnd) || 
            (input.DayEnd > x.DayStart && input.DayEnd <= x.DayEnd) ||
            (input.DayStart <= x.DayStart && input.DayEnd >= x.DayEnd));
            
        if (isExist) throw Oops.Bah("退款规则时间段存在重叠");

        var entity = input.Adapt<RefundConfig>();
        entity.Id = _idGenerator.NextId();
        await _repository.InsertAsync(entity);
        
        // 清除缓存
        await _easyCachingProvider.RemoveAsync(CacheKey);
    }

    /// <summary>
    /// 更新退款配置
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    [DisplayName("更新退款配置")]
    [HttpPut("update")]
    public async Task Update(RefundConfigInput input)
    {
        if (!input.Id.HasValue) throw Oops.Bah("Id不能为空");
        
        // 校验重叠 (排除自身)
        var isExist = await _repository.IsAnyAsync(x => 
            x.Id != input.Id &&
            ((input.DayStart >= x.DayStart && input.DayStart < x.DayEnd) || 
            (input.DayEnd > x.DayStart && input.DayEnd <= x.DayEnd) ||
            (input.DayStart <= x.DayStart && input.DayEnd >= x.DayEnd)));
            
        if (isExist) throw Oops.Bah("退款规则时间段存在重叠");

        var entity = await _repository.GetByIdAsync(input.Id.Value);
        if (entity == null) throw Oops.Bah("配置不存在");

        input.Adapt(entity);
        await _repository.UpdateAsync(entity);
        
        // 清除缓存
        await _easyCachingProvider.RemoveAsync(CacheKey);
    }

    /// <summary>
    /// 删除退款配置
    /// </summary>
    /// <param name="ids"></param>
    /// <returns></returns>
    [DisplayName("删除退款配置")]
    [HttpPost("delete")]
    public async Task Delete([FromBody] List<long> ids)
    {
        await _repository.DeleteAsync(x => ids.Contains(x.Id));
        
        // 清除缓存
        await _easyCachingProvider.RemoveAsync(CacheKey);
    }

    /// <summary>
    /// 计算退款金额
    /// </summary>
    /// <param name="totalAmount">总金额</param>
    /// <param name="eventStartTime">赛事开始时间</param>
    /// <returns>应退金额</returns>
    [NonAction]
    public async Task<decimal> CalculateRefundAmount(decimal totalAmount, DateTime eventStartTime)
    {
        // 优先使用 GetList (带缓存)
        var configs = await GetList();
        configs = configs.Where(x => x.Status == Core.Enum.AvailabilityStatus.Enable).ToList();
        
        if (!configs.Any()) return totalAmount;

        var daysRemaining = (eventStartTime - DateTime.Now).TotalDays;
        if (daysRemaining < 0) daysRemaining = 0;

        // 查找匹配的规则
        var matchConfig = configs.FirstOrDefault(c => 
            daysRemaining >= c.DayStart && 
            (c.DayEnd == int.MaxValue ? true : daysRemaining < c.DayEnd)
        );

        if (matchConfig != null)
        {
            var deductAmount = totalAmount * (matchConfig.DeductPercentage / 100m);
            return totalAmount - deductAmount;
        }

        return totalAmount;
    }
}