using System;
using System.Collections.Generic;
using Microsoft.Data.Sqlite;
using ErvDashboard.Model;

namespace ErvDashboard.Storage
{
    // 로그 시계열 실시간 저장 (SQLite 단일파일, 무제한 누적).
    //  - sample      : 5초 1행 (시간·전원·운전/풍량·시나리오)
    //  - room_sample : 실별 댐퍼/센서 (sample 당 N행)
    // 그래프는 LoadRecent() 로 최근 구간을 읽어 표시, 이후 실시간 append.
    public sealed class LogDb : IDisposable
    {
        readonly SqliteConnection _conn;

        public LogDb(string path)
        {
            _conn = new SqliteConnection($"Data Source={path}");
            _conn.Open();
            Exec("PRAGMA journal_mode=WAL;");      // 동시 읽기/쓰기 성능
            Exec("PRAGMA synchronous=NORMAL;");
            Exec(@"CREATE TABLE IF NOT EXISTS sample(
                       id      INTEGER PRIMARY KEY AUTOINCREMENT,
                       time    INTEGER NOT NULL,   -- DateTime.Ticks
                       power   INTEGER, runmode INTEGER, automode INTEGER, fanmode INTEGER,
                       sleep   INTEGER, cook    INTEGER, recover INTEGER, hystpreset INTEGER);");
            // 구버전 DB 마이그레이션 — 이미 있으면 무시
            try { Exec("ALTER TABLE sample ADD COLUMN automode INTEGER DEFAULT 0;"); } catch { }
            try { Exec("ALTER TABLE sample ADD COLUMN hystpreset INTEGER DEFAULT 0;"); } catch { }
            Exec(@"CREATE TABLE IF NOT EXISTS room_sample(
                       sample_id INTEGER NOT NULL,
                       room_idx  INTEGER NOT NULL,
                       damper_sa INTEGER, damper_ra INTEGER,
                       co2 INTEGER, pm25 INTEGER, pm10 INTEGER, voc INTEGER,
                       temp INTEGER, humi INTEGER, led INTEGER, level INTEGER,
                       PRIMARY KEY(sample_id, room_idx));");
        }

        void Exec(string sql)
        {
            using var cmd = _conn.CreateCommand();
            cmd.CommandText = sql;
            cmd.ExecuteNonQuery();
        }

        // 1샘플 실시간 저장 (sample + room_sample 트랜잭션 1회).
        public void Insert(LogSample s)
        {
            using var tx = _conn.BeginTransaction();

            long id;
            using (var cmd = _conn.CreateCommand())
            {
                cmd.Transaction = tx;
                cmd.CommandText =
                    "INSERT INTO sample(time,power,runmode,automode,fanmode,sleep,cook,recover,hystpreset) " +
                    "VALUES($t,$p,$rm,$am,$fm,$sl,$ck,$rc,$hp); SELECT last_insert_rowid();";
                cmd.Parameters.AddWithValue("$t", s.Time.Ticks);
                cmd.Parameters.AddWithValue("$p", s.Power ? 1 : 0);
                cmd.Parameters.AddWithValue("$rm", (int)s.RunMode);
                cmd.Parameters.AddWithValue("$am", (int)s.AutoMode);
                cmd.Parameters.AddWithValue("$hp", (int)s.HystPreset);
                cmd.Parameters.AddWithValue("$fm", (int)s.FanMode);
                cmd.Parameters.AddWithValue("$sl", s.SmartSleep ? 1 : 0);
                cmd.Parameters.AddWithValue("$ck", s.ComfortCook ? 1 : 0);
                cmd.Parameters.AddWithValue("$rc", s.ReliefRecover ? 1 : 0);
                id = (long)(cmd.ExecuteScalar() ?? 0L);
            }

            using (var cmd = _conn.CreateCommand())
            {
                cmd.Transaction = tx;
                cmd.CommandText =
                    "INSERT INTO room_sample(sample_id,room_idx,damper_sa,damper_ra,co2,pm25,pm10,voc,temp,humi,led,level) " +
                    "VALUES($sid,$ri,$dsa,$dra,$co2,$pm25,$pm10,$voc,$tp,$hm,$led,$lv);";
                var pSid = cmd.Parameters.Add("$sid", SqliteType.Integer);
                var pRi  = cmd.Parameters.Add("$ri",  SqliteType.Integer);
                var pDsa = cmd.Parameters.Add("$dsa", SqliteType.Integer);
                var pDra = cmd.Parameters.Add("$dra", SqliteType.Integer);
                var pCo2 = cmd.Parameters.Add("$co2", SqliteType.Integer);
                var pP25 = cmd.Parameters.Add("$pm25", SqliteType.Integer);
                var pP10 = cmd.Parameters.Add("$pm10", SqliteType.Integer);
                var pVoc = cmd.Parameters.Add("$voc", SqliteType.Integer);
                var pTp  = cmd.Parameters.Add("$tp",  SqliteType.Integer);
                var pHm  = cmd.Parameters.Add("$hm",  SqliteType.Integer);
                var pLed = cmd.Parameters.Add("$led", SqliteType.Integer);
                var pLv  = cmd.Parameters.Add("$lv",  SqliteType.Integer);
                pSid.Value = id;
                for (int i = 0; i < s.Rooms.Length; i++)
                {
                    var rm = s.Rooms[i];
                    pRi.Value = i;
                    pDsa.Value = rm.DamperSa ? 1 : 0;
                    pDra.Value = rm.DamperRa ? 1 : 0;
                    pCo2.Value = rm.Co2; pP25.Value = rm.Pm25; pP10.Value = rm.Pm10; pVoc.Value = rm.Voc;
                    pTp.Value = rm.Temp; pHm.Value = rm.Humi; pLed.Value = rm.Led; pLv.Value = rm.Level;
                    cmd.ExecuteNonQuery();
                }
            }

            tx.Commit();
        }

        // 최근 max개 샘플을 시간 오름차순으로 로드 (그래프 표시용).
        public List<LogSample> LoadRecent(int max)
        {
            using var cmd = _conn.CreateCommand();
            cmd.CommandText =
                "SELECT id,time,power,runmode,automode,fanmode,sleep,cook,recover,hystpreset FROM " +
                "(SELECT * FROM sample ORDER BY id DESC LIMIT $n) ORDER BY id ASC;";
            cmd.Parameters.AddWithValue("$n", max);
            return Materialize(cmd);
        }

        // 지정 날짜(그날 00:00 ~ 다음날 00:00, 로컬)의 샘플을 시간 오름차순으로 로드.
        public List<LogSample> LoadByDate(DateTime day)
        {
            using var cmd = _conn.CreateCommand();
            cmd.CommandText =
                "SELECT id,time,power,runmode,automode,fanmode,sleep,cook,recover,hystpreset " +
                "FROM sample WHERE time >= $s AND time < $e ORDER BY id ASC;";
            cmd.Parameters.AddWithValue("$s", day.Date.Ticks);
            cmd.Parameters.AddWithValue("$e", day.Date.AddDays(1).Ticks);
            return Materialize(cmd);
        }

        // 데이터가 존재하는 날짜 목록(오름차순) — 상단 날짜 선택 UI용.
        public List<DateTime> LoadDates()
        {
            var list = new List<DateTime>();
            using var cmd = _conn.CreateCommand();
            // Ticks/일(864e9)로 버킷팅 → 날짜(자정) 환산
            cmd.CommandText = "SELECT DISTINCT time/864000000000 FROM sample ORDER BY 1;";
            using var rd = cmd.ExecuteReader();
            while (rd.Read()) list.Add(new DateTime(rd.GetInt64(0) * TimeSpan.TicksPerDay));
            return list;
        }

        // sample 행을 읽고 room_sample 을 붙여 LogSample 리스트로 구성 (시간 오름차순).
        List<LogSample> Materialize(SqliteCommand sampleCmd)
        {
            var byId = new Dictionary<long, LogSample>();
            var order = new List<long>();
            using (var rd = sampleCmd.ExecuteReader())
            {
                while (rd.Read())
                {
                    long id = rd.GetInt64(0);
                    byId[id] = new LogSample
                    {
                        Time = new DateTime(rd.GetInt64(1)),
                        Power = rd.GetInt32(2) != 0,
                        RunMode = (byte)rd.GetInt32(3),
                        AutoMode = (byte)(rd.IsDBNull(4) ? 0 : rd.GetInt32(4)),
                        FanMode = (byte)rd.GetInt32(5),
                        SmartSleep = rd.GetInt32(6) != 0,
                        ComfortCook = rd.GetInt32(7) != 0,
                        ReliefRecover = rd.GetInt32(8) != 0,
                        HystPreset = (byte)(rd.IsDBNull(9) ? 0 : rd.GetInt32(9)),
                    };
                    order.Add(id);
                }
            }
            if (order.Count == 0) return new List<LogSample>();
            AttachRooms(byId, order);
            var result = new List<LogSample>(order.Count);
            foreach (var id in order) result.Add(byId[id]);
            return result;
        }

        // order(오름차순 id) 범위의 room_sample 을 읽어 각 LogSample.Rooms 채움.
        void AttachRooms(Dictionary<long, LogSample> byId, List<long> order)
        {
            var rooms = new Dictionary<long, List<RoomSample>>();
            using var cmd = _conn.CreateCommand();
            cmd.CommandText =
                "SELECT sample_id,room_idx,damper_sa,damper_ra,co2,pm25,pm10,voc,temp,humi,led,level " +
                "FROM room_sample WHERE sample_id BETWEEN $min AND $max ORDER BY sample_id, room_idx;";
            cmd.Parameters.AddWithValue("$min", order[0]);
            cmd.Parameters.AddWithValue("$max", order[order.Count - 1]);
            using var rd = cmd.ExecuteReader();
            while (rd.Read())
            {
                long sid = rd.GetInt64(0);
                if (!byId.ContainsKey(sid)) continue;
                if (!rooms.TryGetValue(sid, out var lst)) { lst = new List<RoomSample>(); rooms[sid] = lst; }
                lst.Add(new RoomSample
                {
                    DamperSa = rd.GetInt32(2) != 0,
                    DamperRa = rd.GetInt32(3) != 0,
                    Co2 = rd.GetInt32(4), Pm25 = rd.GetInt32(5), Pm10 = rd.GetInt32(6), Voc = rd.GetInt32(7),
                    Temp = rd.GetInt32(8), Humi = rd.GetInt32(9), Led = rd.GetInt32(10), Level = rd.GetInt32(11),
                });
            }
            foreach (var id in order)
                if (rooms.TryGetValue(id, out var lst)) byId[id].Rooms = lst.ToArray();
        }

        public void Dispose() => _conn.Dispose();
    }
}