using System;
using System.Collections.Generic;
using System.Data;
using System.Net;
using System.Threading.Tasks;
using CSRedis;
using dodohold.core;
using System.Text.Json;
using YunhuiKit;

namespace molilian.core
{
    public partial class TracksCore
    {
        private const string RedisPrefix = ":tracks_v123";
        private const int DailyExpireSeconds = 40 * 86400;
        private const int HourlyExpireSeconds = 7 * 86400; // keep a week of hourly buckets
        private const string DefaultDimensionValue = "";
        private const int LinkCacheExpireSeconds = 30 * 86400;
        private const string TrackRequestLogKey = ":tracks:request:logs";
        private static readonly HashSet<string> SupportEventTypes = new(StringComparer.OrdinalIgnoreCase) { "expose", "click" };
        internal static int ExposeTrackId = 2;
        internal static int ClickTrackId = 1;

        /// <summary>
        /// 生成一个监测链接（仅返回 path，不包含域名），同时落地到 track_links
        /// </summary>
        public static Task<TrackLinkDTO> CreateLinkAsync(string eventType, string typename, string scene, string uniqueId, string description = "", bool forceNew = false)
        {
            eventType = NormalizeEventType(eventType);
            typename = Normalize(typename);
            scene = NormalizeOrAll(scene);
            uniqueId = NormalizeOrAll(uniqueId);
            description = Normalize(description);

            if (!SupportEventTypes.Contains(eventType))
            {
                return Task.FromResult<TrackLinkDTO>(null);
            }

            string cacheKey = $"{RedisPrefix}:link:{eventType}:{typename}:{scene}:{uniqueId}";
            if (!forceNew)
            {
                try
                {
                    int cachedId = RedisHelper.Get<int>(cacheKey);
                    if (cachedId > 0)
                    {
                        var cachedLink = RedisHelper.Get<TrackLinkDTO>(GetLinkIdCacheKey(cachedId));
                        if (cachedLink != null) return Task.FromResult(cachedLink);
                    }
                }
                catch
                {
                    // ignore cache errors
                }
            }

            try
            {
                using var conn = DBContext.GetOpenConnection();
                TrackLinkDTO exist = null;
                if (!forceNew)
                {
                    exist = new DBContext.Table(conn, "track_links")
                        .Get<TrackLinkDTO>("event_type=@event_type AND platform=@platform AND scene=@scene AND unique_id=@unique_id",
                            new { event_type = eventType, platform = typename, scene, unique_id = uniqueId });
                }

                if (exist != null)
                {
                    exist.description = description;
                    string path = BuildPath(exist.id, uniqueId);
                    if (string.IsNullOrEmpty(exist.path) || !exist.path.Contains("track_id"))
                    {
                        exist.path = path;
                        new DBContext.Table(conn, "track_links")
                            .Add("path", path)
                            .Add("description", description)
                            .Add("update_time", DateTime.Now)
                            .Where("id=@id", new { exist.id })
                            .Update();
                    }
                    _ = RedisHelper.Set(cacheKey, exist.id, LinkCacheExpireSeconds);
                    _ = RedisHelper.Set(GetLinkIdCacheKey(exist.id), exist, LinkCacheExpireSeconds);
                    return Task.FromResult(exist);
                }

                var item = new TrackLinkDTO
                {
                    event_type = eventType,
                    platform = typename,
                    scene = scene,
                    unique_id = uniqueId,
                    path = string.Empty,
                    description = description,
                    create_time = DateTime.Now,
                    update_time = DateTime.Now
                };

                var id = conn.Insert(item);
                if (id != null && int.TryParse(id.ToString(), out var linkId))
                {
                    item.id = linkId;
                    item.path = BuildPath(linkId, uniqueId);
                    new DBContext.Table(conn, "track_links")
                        .Add("path", item.path)
                        .Add("description", description)
                        .Add("update_time", DateTime.Now)
                        .Where("id=@id", new { item.id })
                        .Update();
                }
                _ = RedisHelper.Set(cacheKey, item.id, LinkCacheExpireSeconds);
                _ = RedisHelper.Set(GetLinkIdCacheKey(item.id), item, LinkCacheExpireSeconds);
                return Task.FromResult(item);
            }
            catch (Exception ex)
            {
                _ = new LoggerLibrary("TracksCore", "CreateLink")
                    .Info(ex.Message, ex.StackTrace)
                    .SaveAsync();
                return Task.FromResult<TrackLinkDTO>(null);
            }
        }

        /// <summary>
        /// 曝光/点击触发：计入 Redis，失败不影响返回
        /// </summary>
        public static Task<bool> TrackAsync(TrackLinkDTO link)
        {

            string dateStr = DateTime.Now.ToString("yyyyMMdd");
            string hourStr = DateTime.Now.ToString("yyyyMMddHH");

            var metrics = new List<(string key, string indexKey, string indexValue, int expire)>
            {
                ($"{RedisPrefix}:daily:{link.event_type}:{link.id}:{dateStr}", $"{RedisPrefix}:daily:index:{dateStr}:track", $"{link.event_type}|{link.id}", DailyExpireSeconds),
                ($"{RedisPrefix}:hour:{link.event_type}:{link.id}:{hourStr}", $"{RedisPrefix}:hour:index:{hourStr}:track", $"{link.event_type}|{link.id}", HourlyExpireSeconds),
            };

            try
            {
                foreach (var metric in metrics)
                {
                    RedisHelper.IncrBy(metric.key);
                    RedisHelper.Expire(metric.key, metric.expire);

                    RedisHelper.SAdd(metric.indexKey, metric.indexValue);
                    RedisHelper.Expire(metric.indexKey, metric.expire);
                }
                return Task.FromResult(true);
            }
            catch (Exception ex)
            {
                _ = new LoggerLibrary("TracksCore", "TrackAsync")
                    .Info(ex.Message, ex.StackTrace)
                    .SaveAsync();
                return Task.FromResult(false);
            }
        }

        /// <summary>
        /// 日报：拉取昨日 Redis 计数并落地到 track_daily_report（默认统计昨天，可传 reportDate）
        /// </summary>
        public static async Task<int> FlushDailyAsync(DateTime targetDate)
        {
            string dateStr = targetDate.ToString("yyyyMMdd");
            string indexKey = $"{RedisPrefix}:daily:index:{dateStr}:track";

            var indexMembers = await RedisHelper.SMembersAsync<string>(indexKey) ?? [];
            if (indexMembers == null || indexMembers.Length == 0) return 0;

            int rows = 0;
            using var conn = DBContext.GetOpenConnection();
            foreach (var member in indexMembers)
            {
                var parts = member.Split('|');
                if (parts.Length != 2) continue;

                string eventType = NormalizeEventType(parts[0]);
                if (!SupportEventTypes.Contains(eventType)) continue;
                if (!int.TryParse(parts[1], out var trackId) || trackId <= 0) continue;

                string countKey = $"{RedisPrefix}:daily:{eventType}:{trackId}:{dateStr}";
                int total = await RedisHelper.GetAsync<int>(countKey);
                if (total <= 0) continue;

                var exist = new DBContext.Table(conn, "track_daily_report")
                    .Fields("id")
                    .Get<dynamic>("report_date=@report_date AND event_type=@event_type AND track_link_id=@trackId",
                        new { report_date = targetDate, event_type = eventType, trackId });

                var update = new DBContext.Table(conn, "track_daily_report")
                    .Add("event_count", total)
                    .Add("track_link_id", trackId)
                    .Add("platform", string.Empty)
                    .Add("scene", string.Empty)
                    .Add("unique_id", string.Empty)
                    .Add("update_time", DateTime.Now);

                if (exist == null)
                {
                    update.Add("report_date", targetDate)
                          .Add("event_type", eventType)
                          .Add("create_time", DateTime.Now)
                          .Create();
                }
                else
                {
                    update.Where("id=@id", new { exist.id }).Update();
                }
                rows++;
            }
            return rows;
        }
        public static string BuildPath(int trackId, TkDataDTO result)
        {
            if (result == null) return string.Empty;
            string unique_id = $"1|{result.itemId}_{result.mktId}";
            return BuildPath(trackId, unique_id);
        }
        public static string BuildPath(int trackId, JdDataDTO result)
        {
            if (result == null) return string.Empty;
            string unique_id = $"13|{result.shortLinkurl.UrlEncode()}";
            return BuildPath(trackId, unique_id);
        }
        public static string BuildPath(int trackId, PddDataDTO result)
        {
            if (result == null) return string.Empty;
            string unique_id = $"9|{result.shortLinkurl.UrlEncode()}";
            return BuildPath(trackId, unique_id);
        }

        public static string BuildPath(int trackId, string unique_id = "")
        {
            return $"https://api.molilian.com/tracks/track?track_id={trackId}&unique_id={unique_id}";
        }

        public static string GetLinkCacheKey(string eventType, string typename, string scene, string uniqueId)
        {
            eventType = NormalizeEventType(eventType);
            typename = Normalize(typename);
            scene = NormalizeOrAll(scene);
            uniqueId = NormalizeOrAll(uniqueId);
            return $"{RedisPrefix}:link:{eventType}:{typename}:{scene}:{uniqueId}";
        }

        public static string GetLinkIdCacheKey(int trackId)
        {
            return $"{RedisPrefix}:linkid:{trackId}";
        }

        public static async Task<TrackLinkDTO> GetLinkByIdAsync(int trackId)
        {
            if (trackId <= 0) return null;
            string cacheKey = GetLinkIdCacheKey(trackId);
            try
            {
                var cached = RedisHelper.Get<TrackLinkDTO>(cacheKey);
                if (cached != null) return cached;
            }
            catch { }

            try
            {
                var item = new DBContext.Table("track_links").Get<TrackLinkDTO>("id=@id", new { id = trackId });
                if (item != null)
                {
                    _ = RedisHelper.Set(cacheKey, item, LinkCacheExpireSeconds);
                }
                return item;
            }
            catch
            {
                return null;
            }
        }

        public static Task<bool> LogTrackRequestAsync(TrackRequestLogDTO dto)
        {
            try
            {
                dto.event_type = NormalizeEventType(dto.event_type);
                dto.platform = Normalize(dto.platform);
                dto.typename = Normalize(dto.typename);
                dto.scene = NormalizeOrAll(dto.scene);
                dto.unique_id = NormalizeOrAll(dto.unique_id);
                dto.ip = Normalize(dto.ip);
                dto.user_agent = Normalize(dto.user_agent);
                dto.referer = Normalize(dto.referer);
                dto.create_time = DateTime.Now;

                RedisHelper.RPush(TrackRequestLogKey, dto);
                return Task.FromResult(true);
            }
            catch
            {
                return Task.FromResult(false);
            }
        }

        public static async Task<int> InsertTrackRequestLogAsync(int limit, YunhuiKit.RedisClient redis)
        {
            int count = 0;
            try
            {
                using var conn = DBContext.GetOpenConnection();
                for (int i = 0; i < limit; i++)
                {
                    var entity = await redis.LPopAsync<TrackRequestLogDTO>(TrackRequestLogKey);
                    if (entity == null) break;
                    try
                    {
                        if (entity.create_time == default) entity.create_time = DateTime.Now;
                        conn.Insert(entity);
                        count++;
                    }
                    catch
                    {
                        // ignore malformed item
                    }
                }
            }
            catch
            {
                return count;
            }
            return count;
        }

        private static string Normalize(string value)
        {
            return (value ?? string.Empty).Trim();
        }

        private static string NormalizeOrAll(string value)
        {
            var result = Normalize(value);
            return string.IsNullOrEmpty(result) ? DefaultDimensionValue : result;
        }

        private static string NormalizeEventType(string value)
        {
            return Normalize(value).ToLowerInvariant();
        }

        private static int GetTrackLinkId(IDbConnection conn, string eventType, string platform, string scene, string uniqueId)
        {
            try
            {
                var record = new DBContext.Table(conn, "track_links")
                    .Fields("id")
                    .Get<TrackLinkDTO>("event_type=@event_type AND platform=@platform AND scene=@scene AND unique_id=@unique_id",
                        new { event_type = eventType, platform, scene, unique_id = uniqueId });
                if (record == null) return 0;
                return record.id;
            }
            catch
            {
                return 0;
            }
        }
    }

}