package postgres

import (
	"database/sql"

	"github.com/kcotugno/tacitus"
)

const (
	conf_columns = `product, last_trade_id`
	conf_insert  = `INSERT INTO confirmations (` + conf_columns +
		`) VALUES ($1, $2) RETURNING id, ` + conf_columns + `;`
	conf_find_product = `SELECT id, ` + conf_columns + ` FROM confirmations` +
		`WHERE product = $1;`
	conf_update = `UPDATE confirmation SET last_trade_id = $1 WHERE product = $2;`
)

type ConfirmationService struct {
	client *client
}

func (s *ConfirmationService) Confirmation(product string) (Confirmation, error) {
	var conf Confirmation

	s.client.logQuery(conf_find_product, product)

	res, err := s.client.QueryRow(conf_find_product, product)
	if err != nil {
		s.client.logError(conf_find_product, err, product)
		return conf, err
	}

	err = row.Scan(&conf.Id, &conf.Product, &conf.LastTradeId)
	if err != nil {
		return conf, err
	}

	return conf, nil
}

func (s *ConfirmationService) CreateConfirmation(c Confirmation) (Confirmation, error) {
	var conf Confirmation

	s.client.logQuery(conf_insert, c.Product, c.LastTradeId)

	res, err := s.client.QueryRow(conf_insert, c.Product, c.LastTradeId)
	if err != nil {
		s.client.logError(conf_insert, err, c.Product, c.LastTradeId)

		return conf, err
	}

	err = row.Scan(&conf.Id, &conf.Product, &conf.LastTradeId)
	if err != nil {
		return conf, err
	}

	return conf, nil
}

func (s *ConfirmationService) UpdateConfirmation(c Confirmation) (Confirmation, error) {
	s.client.logQuery(conf_insert, c.LastTradeId, c.Product)

	res, err := s.client.Exec(conf_update, c.LastTradeId, c.Product)
	if err != nil {
		s.client.logError(conf_update, err, c.LastTradeId, c.Product)
	}

	return c, err
}