using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using UnityEngine;

using SqliteConnection = Microsoft.Data.Sqlite.SqliteConnection;

public class PlayerStatsService : IDisposable
{
    private string _connectionString;
    private IDbConnection _dbConnection;
    private string dbPath;

    public PlayerStatsService()
    {
        dbPath = Path.Combine(Application.persistentDataPath, "player_stats.db");
        _connectionString = $"Data Source={dbPath};Cache=Shared;Mode=ReadWriteCreate";
    }

    // Инициализация базы данных и создание таблицы
    public void Initialize()
    {
        try
        {
            bool isNewDatabase = !DatabaseExists();
            SQLitePCL.Batteries_V2.Init();

            _dbConnection = new SqliteConnection(_connectionString);
            _dbConnection.Open();

            CreateTableIfNotExists();
            if (isNewDatabase)
            {
                InitialRecords(8);
            }
        }
        catch (Exception ex)
        {
            Debug.LogError($"Failed to initialize PlayerStatsService: {ex.Message}");
            throw;
        }
    }
    private bool DatabaseExists()
    {
        return File.Exists(dbPath);
    }
    private void CreateTableIfNotExists()
    {
        string createTableQuery = @"
        CREATE TABLE IF NOT EXISTS player_stats (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            player_name TEXT NOT NULL,
            completion_time_sec REAL NOT NULL,
            moves_count INTEGER NOT NULL,
            completed_at DATETIME NOT NULL,
            is_synced BOOLEAN NOT NULL DEFAULT 0,
            is_bot BOOLEAN NOT NULL DEFAULT 0 -- Новое поле
        )";

        using (IDbCommand dbCommand = _dbConnection.CreateCommand())
        {
            dbCommand.CommandText = createTableQuery;
            dbCommand.ExecuteNonQuery();
        }

        CreateIndexes();
    }

    private void CreateIndexes()
    {
        string[] indexQueries = {
            "CREATE INDEX IF NOT EXISTS idx_time_moves ON player_stats (completion_time_sec, moves_count)",
            "CREATE INDEX IF NOT EXISTS idx_completed_at ON player_stats (completed_at)"
        };

        foreach (string query in indexQueries)
        {
            using (IDbCommand dbCommand = _dbConnection.CreateCommand())
            {
                dbCommand.CommandText = query;
                dbCommand.ExecuteNonQuery();
            }
        }
    }

    // Добавление новой записи
    public void AddRecord(PlayerStatsRecord record)
    {
        if (record == null)
            throw new ArgumentNullException(nameof(record));

        string insertQuery = @"
        INSERT INTO player_stats (player_name, completion_time_sec, moves_count, completed_at, is_synced, is_bot)
        VALUES (@playerName, @completionTime, @movesCount, @completedAt, @isSynced, @isBot)";

        using (IDbCommand dbCommand = _dbConnection.CreateCommand())
        {
            dbCommand.CommandText = insertQuery;

            AddParameter(dbCommand, "@playerName", record.PlayerName);
            AddParameter(dbCommand, "@completionTime", record.CompletionTimeSec);
            AddParameter(dbCommand, "@movesCount", record.MovesCount);
            AddParameter(dbCommand, "@completedAt", record.CompletedAt);
            AddParameter(dbCommand, "@isSynced", record.IsSynced);
            AddParameter(dbCommand, "@isBot", record.IsBot); // Новый параметр

            dbCommand.ExecuteNonQuery();
        }
    }

    // Удобный метод для добавления записи без создания объекта вручную
    public void AddRecord(string playerName, float completionTimeSec, int movesCount, bool isBot = false)
    {
        var record = new PlayerStatsRecord(playerName, completionTimeSec, movesCount, isBot);
        AddRecord(record);
    }

    // Получение N лучших игроков
    public List<PlayerStatsRecord> GetTopPlayers(int count = 3, bool includeBots = true)
    {
        var records = new List<PlayerStatsRecord>();

        string whereClause = includeBots ? "" : " WHERE is_bot = 0";
        string selectQuery = $@"
        SELECT id, player_name, completion_time_sec, moves_count, completed_at, is_synced, is_bot
        FROM player_stats 
        {whereClause}
        ORDER BY completion_time_sec ASC, moves_count ASC 
        LIMIT @limit";

        using (IDbCommand dbCommand = _dbConnection.CreateCommand())
        {
            dbCommand.CommandText = selectQuery;
            AddParameter(dbCommand, "@limit", count);

            using (IDataReader reader = dbCommand.ExecuteReader())
            {
                while (reader.Read())
                {
                    records.Add(CreateRecordFromReader(reader));
                }
            }
        }

        return records;
    }

    // Получение места записи в рейтинге
    public int GetRecordRank(PlayerStatsRecord record)
    {
        if (record == null)
            throw new ArgumentNullException(nameof(record));

        string rankQuery = @"
            SELECT COUNT(*) + 1 as rank
            FROM player_stats 
            WHERE completion_time_sec < @completionTime 
               OR (completion_time_sec = @completionTime AND moves_count < @movesCount)";

        using (IDbCommand dbCommand = _dbConnection.CreateCommand())
        {
            dbCommand.CommandText = rankQuery;
            AddParameter(dbCommand, "@completionTime", record.CompletionTimeSec);
            AddParameter(dbCommand, "@movesCount", record.MovesCount);

            var result = dbCommand.ExecuteScalar();
            return Convert.ToInt32(result);
        }
    }

    // Получение общего количества записей
    public int GetTotalRecordsCount()
    {
        string countQuery = "SELECT COUNT(*) FROM player_stats";

        using (IDbCommand dbCommand = _dbConnection.CreateCommand())
        {
            dbCommand.CommandText = countQuery;
            var result = dbCommand.ExecuteScalar();
            return Convert.ToInt32(result);
        }
    }

    public PlayerStatsRecord GetLatestRecord()
    {
        string selectQuery = @"
    SELECT id, player_name, completion_time_sec, moves_count, completed_at, is_synced, is_bot
    FROM player_stats 
    ORDER BY completed_at DESC 
    LIMIT 1";

        using (IDbCommand dbCommand = _dbConnection.CreateCommand())
        {
            dbCommand.CommandText = selectQuery;

            using (IDataReader reader = dbCommand.ExecuteReader())
            {
                if (reader.Read())
                {
                    return CreateRecordFromReader(reader);
                }
            }
        }

        return null; // Если записей нет
    }



    // Вспомогательный метод для создания записи из DataReader
    private PlayerStatsRecord CreateRecordFromReader(IDataReader reader)
    {
        return new PlayerStatsRecord
        {
            Id = reader.GetInt32(0),
            PlayerName = reader.GetString(1),
            CompletionTimeSec = reader.GetFloat(2), // Изменено с GetInt32 на GetFloat
            MovesCount = reader.GetInt32(3),
            CompletedAt = reader.GetDateTime(4),
            IsSynced = reader.GetBoolean(5),
            IsBot = reader.GetBoolean(6) // Новое поле
        };
    }

    // Вспомогательный метод для добавления параметров
    private void AddParameter(IDbCommand command, string parameterName, object value)
    {
        var p = command.CreateParameter();
        p.ParameterName = parameterName;

        if (value is DateTime dt)
        {
            p.DbType = DbType.DateTime; // хранится как TEXT (ISO8601) у Microsoft.Data.Sqlite — читаться будет через GetDateTime
            p.Value = dt;
        }
        else if (value is bool b)
        {
            p.DbType = DbType.Boolean; // в SQLite это 0/1
            p.Value = b;
        }
        else
        {
            p.Value = value ?? DBNull.Value;
        }

        command.Parameters.Add(p);
    }

    // Очистка всех записей (для тестирования)
    public void ClearAllRecords()
    {
        string deleteQuery = "DELETE FROM player_stats";

        using (IDbCommand dbCommand = _dbConnection.CreateCommand())
        {
            dbCommand.CommandText = deleteQuery;
            dbCommand.ExecuteNonQuery();
        }
    }

    // Закрытие соединения
    public void Dispose()
    {
        _dbConnection?.Close();
        _dbConnection?.Dispose();
    }

    private void InitialRecords(int count)
    {
        List<string> highScoreNames = new List<string>
        {
        "ПОБЕДИТЕЛЬ", "ЛЕГЕНДА", "ЧЕМПИОН", "МАСТЕР", "ГЕРОЙ",
        "ЦАРЬ ГОРЫ", "УМНЯШКА300", "НЕЗНАКОМЕЦ", "ТЕНЬ", "НОМЕР_007",
        "ОМЕГА", "АБСОЛЮТ", "ТЕРМИНАТОР", "БЕЗУМНЫЙ_М",
        };

        for (int i = 0; i < count; i++)
        {
            string name = highScoreNames[UnityEngine.Random.Range(0, highScoreNames.Count)];
            highScoreNames.Remove(name);

            int moves = UnityEngine.Random.Range(20, 80);
            float time = UnityEngine.Random.Range(60f, 500f);
            DateTime date = GetRandomDateTimeInRange();

            // Все начальные записи - боты
            PlayerStatsRecord record = new PlayerStatsRecord(name, time, moves, date, true);
            AddRecord(record);
        }
    }

    public void AddDailyRecord()
    {
        List<string> highScoreNames = new List<string>
        {
        "ПОБЕДИТЕЛЬ", "ЛЕГЕНДА", "ЧЕМПИОН", "МАСТЕР", "ГЕРОЙ",
        "ЦАРЬ ГОРЫ", "УМНЯШКА300", "НЕЗНАКОМЕЦ", "ТЕНЬ", "НОМЕР_007",
        "ОМЕГА", "АБСОЛЮТ", "ТЕРМИНАТОР", "БЕЗУМНЫЙ_М",
        };

        string name = highScoreNames[UnityEngine.Random.Range(0, highScoreNames.Count)];

        int moves = UnityEngine.Random.Range(20, 80);
        float time = UnityEngine.Random.Range(60f, 500f);
        DateTime date = DateTime.Now;

        PlayerStatsRecord record = new PlayerStatsRecord(name, time, moves, date, true);
        AddRecord(record);
    }


    public static DateTime GetRandomDateTimeInRange()
    {
        System.Random random = new System.Random();

        // Диапазон дней: от сегодня-5 до сегодня
        DateTime today = DateTime.Today;
        DateTime minDate = today.AddDays(-5);
        int daysRange = (today - minDate).Days;
        DateTime randomDay = minDate.AddDays(random.Next(daysRange + 1)); // +1 чтобы включить сегодня

        // Диапазон часов: от 11 до 17
        int randomHour = random.Next(11, 18); // 18 не включается, так что получим 11-17
        int randomMinute = random.Next(0, 60);
        int randomSecond = random.Next(0, 60);

        return new DateTime(randomDay.Year, randomDay.Month, randomDay.Day,
                           randomHour, randomMinute, randomSecond);
    }
}