package migrations

import (
	"database/sql"
	"context"

	"github.com/c9s/rockhopper"
)

func init() {
	rockhopper.AddMigration(upTradesIndexFix, downTradesIndexFix)
}

func upTradesIndexFix(ctx context.Context, tx *sql.Tx) (err error) {
	// This code is executed when the migration is applied.

	_, err = tx.ExecContext(ctx, "DROP INDEX trades_symbol ON trades;")
	if err != nil {
		return err
	}

	_, err = tx.ExecContext(ctx, "DROP INDEX trades_symbol_fee_currency ON trades;")
	if err != nil {
		return err
	}

	_, err = tx.ExecContext(ctx, "DROP INDEX trades_traded_at_symbol ON trades;")
	if err != nil {
		return err
	}

	_, err = tx.ExecContext(ctx, "CREATE INDEX trades_symbol ON trades (exchange, symbol);")
	if err != nil {
		return err
	}

	_, err = tx.ExecContext(ctx, "CREATE INDEX trades_symbol_fee_currency ON trades (exchange, symbol, fee_currency, traded_at);")
	if err != nil {
		return err
	}

	_, err = tx.ExecContext(ctx, "CREATE INDEX trades_traded_at_symbol ON trades (exchange, traded_at, symbol);")
	if err != nil {
		return err
	}

	return err
}

func downTradesIndexFix(ctx context.Context, tx *sql.Tx) (err error) {
	// This code is executed when the migration is rolled back.

	_, err = tx.ExecContext(ctx, "DROP INDEX trades_symbol ON trades;")
	if err != nil {
		return err
	}

	_, err = tx.ExecContext(ctx, "DROP INDEX trades_symbol_fee_currency ON trades;")
	if err != nil {
		return err
	}

	_, err = tx.ExecContext(ctx, "DROP INDEX trades_traded_at_symbol ON trades;")
	if err != nil {
		return err
	}

	_, err = tx.ExecContext(ctx, "CREATE INDEX trades_symbol ON trades (symbol);")
	if err != nil {
		return err
	}

	_, err = tx.ExecContext(ctx, "CREATE INDEX trades_symbol_fee_currency ON trades (symbol, fee_currency, traded_at);")
	if err != nil {
		return err
	}

	_, err = tx.ExecContext(ctx, "CREATE INDEX trades_traded_at_symbol ON trades (traded_at, symbol);")
	if err != nil {
		return err
	}

	return err
}