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

namespace molilian.core
{
    public partial class TracksCore
    {
        private const string RedisPrefix = ":tracks";
        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 static readonly HashSet<string> SupportEventTypes = new(StringComparer.OrdinalIgnoreCase) { "expose", "click" };

        /// <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 platform, string scene, string uniqueId)
        {
            eventType = NormalizeEventType(eventType);
            platform = Normalize(platform);
            scene = NormalizeOrAll(scene);
            uniqueId = NormalizeOrAll(uniqueId);

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

            string cacheKey = $"{RedisPrefix}:link:{eventType}:{platform}:{scene}:{uniqueId}";
            try
            {
                int cachedId = RedisHelper.Get<int>(cacheKey);
                if (cachedId > 0)
                {
                    string cachedPath = BuildPath(eventType, platform, scene, uniqueId);
                    return Task.FromResult(new TrackLinkDTO
                    {
                        id = cachedId,
                        event_type = eventType,
                        platform = platform,
                        scene = scene,
                        unique_id = uniqueId,
                        path = cachedPath
                    });
                }
            }
            catch
            {
                // ignore cache errors
            }

            string path = BuildPath(eventType, platform, scene, uniqueId);
            try
            {
                using var conn = DBContext.GetOpenConnection();
                var 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, scene, unique_id = uniqueId });

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

                var item = new TrackLinkDTO
                {
                    event_type = eventType,
                    platform = platform,
                    scene = scene,
                    unique_id = uniqueId,
                    path = path,
                    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;
                }
                _ = RedisHelper.Set(cacheKey, item.id, 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(string eventType, string platform, string scene, string uniqueId)
        {
            eventType = NormalizeEventType(eventType);
            platform = Normalize(platform);
            scene = NormalizeOrAll(scene);
            uniqueId = NormalizeOrAll(uniqueId);

            if (!SupportEventTypes.Contains(eventType) || string.IsNullOrEmpty(platform))
            {
                return Task.FromResult(false);
            }

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

            var metrics = new List<(string key, string indexKey, string indexValue, int expire)>
            {
                // Daily buckets
                ($"{RedisPrefix}:daily:{eventType}:{platform}:{dateStr}",
                    $"{RedisPrefix}:daily:index:{dateStr}:platform",
                    $"{eventType}|{platform}", DailyExpireSeconds),

                ($"{RedisPrefix}:daily:{eventType}:{platform}:{scene}:{dateStr}",
                    $"{RedisPrefix}:daily:index:{dateStr}:scene",
                    $"{eventType}|{platform}|{scene}", DailyExpireSeconds),

                ($"{RedisPrefix}:daily:{eventType}:{platform}:{scene}:{uniqueId}:{dateStr}",
                    $"{RedisPrefix}:daily:index:{dateStr}:unique",
                    $"{eventType}|{platform}|{scene}|{uniqueId}", DailyExpireSeconds),

                // Hourly buckets
                ($"{RedisPrefix}:hour:{eventType}:{platform}:{hourStr}",
                    $"{RedisPrefix}:hour:index:{hourStr}:platform",
                    $"{eventType}|{platform}", HourlyExpireSeconds),

                ($"{RedisPrefix}:hour:{eventType}:{platform}:{scene}:{hourStr}",
                    $"{RedisPrefix}:hour:index:{hourStr}:scene",
                    $"{eventType}|{platform}|{scene}", HourlyExpireSeconds),

                ($"{RedisPrefix}:hour:{eventType}:{platform}:{scene}:{uniqueId}:{hourStr}",
                    $"{RedisPrefix}:hour:index:{hourStr}:unique",
                    $"{eventType}|{platform}|{scene}|{uniqueId}", 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}:unique";

            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 != 4) continue;

                string eventType = NormalizeEventType(parts[0]);
                string platform = Normalize(parts[1]);
                string scene = NormalizeOrAll(parts[2]);
                string uniqueId = NormalizeOrAll(parts[3]);
                if (!SupportEventTypes.Contains(eventType)) continue;

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

                int linkId = GetTrackLinkId(conn, eventType, platform, scene, uniqueId);
                var exist = new DBContext.Table(conn, "track_daily_report")
                    .Fields("id")
                    .Get<dynamic>("report_date=@report_date AND event_type=@event_type AND platform=@platform AND scene=@scene AND unique_id=@unique_id",
                        new { report_date = targetDate, event_type = eventType, platform, scene, unique_id = uniqueId });

                var update = new DBContext.Table(conn, "track_daily_report")
                    .Add("event_count", total)
                    .Add("track_link_id", linkId)
                    .Add("update_time", DateTime.Now);

                if (exist == null)
                {
                    update.Add("report_date", targetDate)
                          .Add("event_type", eventType)
                          .Add("platform", platform)
                          .Add("scene", scene)
                          .Add("unique_id", uniqueId)
                          .Add("create_time", DateTime.Now)
                          .Create();
                }
                else
                {
                    update.Where("id=@id", new { exist.id }).Update();
                }
                rows++;
            }
            return rows;
        }

        public static string BuildPath(string eventType, string platform, string scene, string uniqueId)
        {
            string safeEventType = WebUtility.UrlEncode(eventType);
            string safePlatform = WebUtility.UrlEncode(platform);
            string safeScene = WebUtility.UrlEncode(scene);
            string safeUniqueId = WebUtility.UrlEncode(uniqueId);
            return $"https://api.molilian.com/tracks/track?eventType={safeEventType}&platform={safePlatform}&scene={safeScene}&uniqueId={safeUniqueId}";
        }

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

        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;
            }
        }
    }

}