using Mapster;
using Microsoft.Extensions.Caching.Distributed;
using Microsoft.Extensions.Configuration;
using Volo.Abp.Application.Services;
using Volo.Abp.Caching;
using Yi.Framework.AiHub.Application.Contracts.Dtos.Announcement;
using Yi.Framework.AiHub.Application.Contracts.IServices;
using Yi.Framework.AiHub.Domain.Entities;
using Yi.Framework.SqlSugarCore.Abstractions;

namespace Yi.Framework.AiHub.Application.Services;

/// <summary>
/// 公告服务
/// </summary>
public class AnnouncementService : ApplicationService, IAnnouncementService
{
    private readonly ISqlSugarRepository<AnnouncementAggregateRoot> _announcementRepository;
    private readonly IConfiguration _configuration;
    private readonly IDistributedCache<AnnouncementCacheDto> _announcementCache;
    private const string AnnouncementCacheKey = "AiHub:Announcement";

    public AnnouncementService(
        ISqlSugarRepository<AnnouncementAggregateRoot> announcementRepository,
        IConfiguration configuration,
        IDistributedCache<AnnouncementCacheDto> announcementCache)
    {
        _announcementRepository = announcementRepository;
        _configuration = configuration;
        _announcementCache = announcementCache;
    }

    /// <summary>
    /// 获取公告信息
    /// </summary>
    public async Task<List<AnnouncementLogDto>> GetAsync()
    {
        // 使用 GetOrAddAsync 从缓存获取或添加数据，缓存1小时
        var cacheData = await _announcementCache.GetOrAddAsync(
            AnnouncementCacheKey,
            async () => await LoadAnnouncementDataAsync(),
            () => new DistributedCacheEntryOptions
            {
                AbsoluteExpirationRelativeToNow = TimeSpan.FromHours(1)
            }
        );

        return cacheData?.Logs ?? new List<AnnouncementLogDto>();
    }

    /// <summary>
    /// 从数据库加载公告数据
    /// </summary>
    private async Task<AnnouncementCacheDto> LoadAnnouncementDataAsync()
    {
        // 1️⃣ 一次性查出全部公告（不排序）
        var logs = await _announcementRepository._DbQueryable
            .ToListAsync();

        var now = DateTime.Now;

        // 2️⃣ 内存中处理排序
        var orderedLogs = logs
            .OrderByDescending(x =>
                x.StartTime <= now &&
                (x.EndTime == null || x.EndTime >= now)
            )
            .ThenByDescending(x => x.StartTime)
            .ToList();

        // 转换为 DTO
        var logDtos = orderedLogs.Adapt<List<AnnouncementLogDto>>();
        return new AnnouncementCacheDto
        {
            Logs = logDtos
        };
    }
}