using dy.net.model;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;

namespace dy.net.service
{
    /// <summary>
    /// 下载配置服务，用于判断是否应该下载视频
    /// </summary>
    public class DownloadConfigService
    {
        private readonly CommonService _commonService;

        public DownloadConfigService(CommonService commonService)
        {
            _commonService = commonService;
        }

        private AppConfig GetConfig()
        {
            return _commonService.GetConfig();
        }

        /// <summary>
        /// 判断是否应该下载视频
        /// </summary>
        /// <param name="videoType">视频类型："1"=喜欢，"2"=收藏</param>
        /// <param name="authorId">作者ID</param>
        /// <param name="authorName">作者名称</param>
        /// <param name="createTime">视频创建时间</param>
        /// <returns>true=应该下载，false=不应该下载</returns>
        public bool ShouldDownload(string videoType, string authorId, string authorName, DateTime createTime)
        {
            var config = GetConfig();
            if (config == null)
            {
                return false;
            }

            // 如果未启用自动下载，直接返回false
            if (config.EnableAutoDownload != true)
            {
                return false;
            }

            // 检查视频类型是否允许下载
            if (videoType == "1" && config.DownloadFavorite != true)
            {
                return false; // 喜欢类型但未启用下载
            }

            if (videoType == "2" && config.DownloadCollect != true)
            {
                return false; // 收藏类型但未启用下载
            }

            // 检查时间范围
            if (config.DownloadDaysRange.HasValue && config.DownloadDaysRange.Value > 0)
            {
                var daysDiff = (DateTime.Now - createTime).TotalDays;
                if (daysDiff > config.DownloadDaysRange.Value)
                {
                    return false; // 超出时间范围
                }
            }

            // 检查作者白名单
            if (!string.IsNullOrWhiteSpace(config.AuthorWhitelist))
            {
                try
                {
                    var whitelist = JsonConvert.DeserializeObject<List<string>>(config.AuthorWhitelist);
                    if (whitelist != null && whitelist.Any())
                    {
                        // 如果配置了白名单，只有白名单中的作者才下载
                        var isInWhitelist = whitelist.Any(a => 
                            (!string.IsNullOrWhiteSpace(authorId) && a.Equals(authorId, StringComparison.OrdinalIgnoreCase)) ||
                            (!string.IsNullOrWhiteSpace(authorName) && a.Equals(authorName, StringComparison.OrdinalIgnoreCase))
                        );
                        if (!isInWhitelist)
                        {
                            return false; // 不在白名单中
                        }
                    }
                }
                catch (Exception ex)
                {
                    Serilog.Log.Warning($"解析作者白名单失败：{ex.Message}");
                }
            }

            // 检查作者黑名单
            if (!string.IsNullOrWhiteSpace(config.AuthorBlacklist))
            {
                try
                {
                    var blacklist = JsonConvert.DeserializeObject<List<string>>(config.AuthorBlacklist);
                    if (blacklist != null && blacklist.Any())
                    {
                        // 如果配置了黑名单，黑名单中的作者不下载
                        var isInBlacklist = blacklist.Any(a => 
                            (!string.IsNullOrWhiteSpace(authorId) && a.Equals(authorId, StringComparison.OrdinalIgnoreCase)) ||
                            (!string.IsNullOrWhiteSpace(authorName) && a.Equals(authorName, StringComparison.OrdinalIgnoreCase))
                        );
                        if (isInBlacklist)
                        {
                            return false; // 在黑名单中
                        }
                    }
                }
                catch (Exception ex)
                {
                    Serilog.Log.Warning($"解析作者黑名单失败：{ex.Message}");
                }
            }

            // 所有检查都通过，可以下载
            return true;
        }
    }
}