// go:build postgres

package postgres

import (
	"database/sql"
	"embed"

	"github.com/golang-migrate/migrate/v4"
	"github.com/golang-migrate/migrate/v4/database/postgres"
	"github.com/golang-migrate/migrate/v4/source/iofs"
)

type PostgresStorage struct {
	db *sql.DB
	fs embed.FS
}

func NewStoragePostgres(fs embed.FS) func(*sql.DB) (interface{}, error) {
	return func(db *sql.DB) (interface{}, error) {
		return &PostgresStorage{db: db, fs: fs}, nil
	}
}

func (s *PostgresStorage) MigrateUp() error {
	driver, err := postgres.WithInstance(s.db, &postgres.Config{
		MigrationsTable: postgres.DefaultMigrationsTable,
		DatabaseName:    "template",
	})
	if err != nil {
		return err
	}
	source, err := iofs.New(s.fs, "migrations/postgres")
	if err != nil {
		return err
	}

	// TODO: pass own logger
	m, err := migrate.NewWithInstance("fs", source, "template", driver)
	if err != nil {
		return err
	}

	if err = m.Up(); err != nil && err != migrate.ErrNoChange {
		return err
	}

	return nil
}

func (s *PostgresStorage) MigrateDown() error {
	driver, err := postgres.WithInstance(s.db, &postgres.Config{
		MigrationsTable: postgres.DefaultMigrationsTable,
		DatabaseName:    "template",
	})
	if err != nil {
		return err
	}
	source, err := iofs.New(s.fs, "migrations/postgres")
	if err != nil {
		return err
	}

	// TODO: pass own logger
	m, err := migrate.NewWithInstance("fs", source, "template", driver)
	if err != nil {
		return err
	}

	if err = m.Down(); err != nil && err != migrate.ErrNoChange {
		return err
	}

	return nil
}