using IBKRTrader.Core.Logging;

namespace IBKRTrader.Core.Database.Migrations;

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

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

    public async Task RunAsync()
    {
        _logger.Info("Core", "Starte IBKR-Datenbankmigrationen...");
        await CreateInstrumentsTableAsync();
        await CreateMarketDataTableAsync();
        await CreateExternalIdentifiersTableAsync();
        _logger.Info("Core", "IBKR-Migrationen abgeschlossen.");
    }

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

    private Task CreateInstrumentsTableAsync() => _db.ExecuteAsync(@"
        CREATE TABLE IF NOT EXISTS `core_ibkr_instruments` (
            `id`                BIGINT       NOT NULL AUTO_INCREMENT PRIMARY KEY,
            `ibkr_conid`        BIGINT       NOT NULL UNIQUE,
            `symbol`            VARCHAR(20)  NOT NULL,
            `sec_type`          VARCHAR(10)  NOT NULL DEFAULT 'STK',
            `exchange`          VARCHAR(20)  NOT NULL DEFAULT 'SMART',
            `primary_exchange`  VARCHAR(20),
            `currency`          VARCHAR(5)   NOT NULL DEFAULT 'USD',
            `company_name`      TEXT,
            `isin`              VARCHAR(12),
            `sector`            VARCHAR(100),
            `industry`          VARCHAR(100),
            `description`       TEXT,
            `active`            TINYINT(1)   NOT NULL DEFAULT 1,
            `last_fetched`      DATETIME,
            `created_at`        DATETIME     DEFAULT CURRENT_TIMESTAMP,
            `updated_at`        DATETIME     DEFAULT CURRENT_TIMESTAMP
                                ON UPDATE CURRENT_TIMESTAMP,
            INDEX `idx_symbol`   (`symbol`),
            INDEX `idx_conid`    (`ibkr_conid`),
            INDEX `idx_active`   (`active`)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;");

    private Task CreateMarketDataTableAsync() => _db.ExecuteAsync(@"
        CREATE TABLE IF NOT EXISTS `core_ibkr_market_data` (
            `instrument_id`  BIGINT        NOT NULL,
            `bar_size`       VARCHAR(10)   NOT NULL DEFAULT 'daily',
            `timestamp`      DATETIME      NOT NULL,
            `open`           DECIMAL(12,6),
            `high`           DECIMAL(12,6),
            `low`            DECIMAL(12,6),
            `close`          DECIMAL(12,6),
            `volume`         BIGINT,
            `wap`            DECIMAL(12,6),
            `bar_count`      INT,
            PRIMARY KEY (`instrument_id`, `bar_size`, `timestamp`),
            INDEX `idx_timestamp` (`timestamp`),
            CONSTRAINT `fk_md_instrument` FOREIGN KEY (`instrument_id`)
                REFERENCES `core_ibkr_instruments` (`id`) ON DELETE CASCADE
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;");

    private Task CreateExternalIdentifiersTableAsync() => _db.ExecuteAsync(@"
        CREATE TABLE IF NOT EXISTS `core_ibkr_external_identifiers` (
            `id`             BIGINT        NOT NULL AUTO_INCREMENT PRIMARY KEY,
            `instrument_id`  BIGINT        NOT NULL,
            `source`         VARCHAR(50)   NOT NULL,
            `ticker`         VARCHAR(50)   NOT NULL,
            `created_at`     DATETIME      DEFAULT CURRENT_TIMESTAMP,
            UNIQUE KEY `uq_mapping` (`instrument_id`, `source`, `ticker`),
            INDEX `idx_source_ticker` (`source`, `ticker`),
            CONSTRAINT `fk_ext_instrument` FOREIGN KEY (`instrument_id`)
                REFERENCES `core_ibkr_instruments` (`id`) ON DELETE CASCADE
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;");
}