using IBKRTrader.Core.Logging;

namespace IBKRTrader.Core.Database.Migrations;

/// <summary>
/// Erstellt alle core_xxx-Tabellen idempotent (IF NOT EXISTS).
/// Wird einmalig beim App-Start ausgeführt.
/// </summary>
public class CoreMigrations
{
    private readonly DatabaseService _db;
    private readonly LoggingService  _logger;

    public CoreMigrations(DatabaseService db, LoggingService logger)
    {
        _db     = db;
        _logger = logger;
    }

    public async Task RunAsync()
    {
        _logger.Info("Core", "Starte Core-Datenbankmigrationen...");
        await CreateCoreSettingsAsync();
        await CreateCoreWorkerLogAsync();
        await CreateCoreTradeHistoryAsync();
        await CreateCoreBudgetAsync();
        await CreateCorePositionAsync();
        _logger.Info("Core", "Core-Migrationen abgeschlossen.");
    }

    // ─── Tabellen ─────────────────────────────────────────────────────────────

    private Task CreateCoreSettingsAsync() => _db.ExecuteAsync(@"
        CREATE TABLE IF NOT EXISTS `core_settings` (
            `key`        VARCHAR(100) NOT NULL PRIMARY KEY,
            `value`      TEXT,
            `updated_at` DATETIME DEFAULT CURRENT_TIMESTAMP
                         ON UPDATE CURRENT_TIMESTAMP
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;");

    private Task CreateCoreWorkerLogAsync() => _db.ExecuteAsync(@"
        CREATE TABLE IF NOT EXISTS `core_worker_log` (
            `id`          BIGINT       NOT NULL AUTO_INCREMENT PRIMARY KEY,
            `worker_name` VARCHAR(100) NOT NULL,
            `module`      VARCHAR(50)  NOT NULL DEFAULT 'Core',
            `started_at`  DATETIME,
            `finished_at` DATETIME,
            `status`      ENUM('Running','Success','Error') DEFAULT 'Running',
            `message`     TEXT,
            INDEX `idx_worker` (`worker_name`, `started_at`)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;");

    private Task CreateCoreTradeHistoryAsync() => _db.ExecuteAsync(@"
        CREATE TABLE IF NOT EXISTS `core_trade_history` (
            `id`            BIGINT       NOT NULL AUTO_INCREMENT PRIMARY KEY,
            `module`        VARCHAR(50)  NOT NULL,
            `symbol`        VARCHAR(20)  NOT NULL,
            `action`        ENUM('BUY','SELL') NOT NULL,
            `quantity`      DECIMAL(18,4),
            `price`         DECIMAL(18,4),
            `total_value`   DECIMAL(18,4),
            `traded_at`     DATETIME,
            `ibkr_order_id` VARCHAR(100),
            `status`        VARCHAR(50),
            `notes`         TEXT,
            `created_at`    DATETIME DEFAULT CURRENT_TIMESTAMP,
            INDEX `idx_symbol` (`symbol`),
            INDEX `idx_module` (`module`)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;");

    private Task CreateCoreBudgetAsync() => _db.ExecuteAsync(@"
        CREATE TABLE IF NOT EXISTS `core_budget` (
            `module`        VARCHAR(50)   NOT NULL PRIMARY KEY,
            `total_budget`  DECIMAL(18,2) DEFAULT 0,
            `used_budget`   DECIMAL(18,2) DEFAULT 0,
            `max_per_trade` DECIMAL(18,2) DEFAULT 0,
            `updated_at`    DATETIME DEFAULT CURRENT_TIMESTAMP
                            ON UPDATE CURRENT_TIMESTAMP
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;");

    private Task CreateCorePositionAsync() => _db.ExecuteAsync(@"
        CREATE TABLE IF NOT EXISTS `core_position` (
            `module`     VARCHAR(50)   NOT NULL,
            `symbol`     VARCHAR(20)   NOT NULL,
            `quantity`   INT           NOT NULL DEFAULT 0,
            `avg_price`  DECIMAL(18,4) NOT NULL DEFAULT 0,
            `updated_at` DATETIME DEFAULT CURRENT_TIMESTAMP
                         ON UPDATE CURRENT_TIMESTAMP,
            PRIMARY KEY (`module`, `symbol`)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;");
}