package main

import (
	"regexp"
	"testing"

	"github.com/DATA-DOG/go-sqlmock"
	"gorm.io/driver/postgres"
	"gorm.io/gorm"
)

func TestPrepareAdditiveMigrationsSkipsMissingLegacyTable(t *testing.T) {
	sqlDatabase, mock, err := sqlmock.New()
	if err != nil {
		t.Fatalf("open sql mock: %v", err)
	}
	defer sqlDatabase.Close()
	mock.ExpectQuery(regexp.QuoteMeta("SELECT count(*) FROM information_schema.tables WHERE table_schema = CURRENT_SCHEMA() AND table_name = $1 AND table_type = $2")).
		WithArgs("gasorder_track_point", "BASE TABLE").
		WillReturnRows(sqlmock.NewRows([]string{"count"}).AddRow(0))
	databaseService, err := gorm.Open(postgres.New(postgres.Config{Conn: sqlDatabase}), &gorm.Config{})
	if err != nil {
		t.Fatalf("open postgres mock: %v", err)
	}
	if err := prepareAdditiveMigrations(databaseService, "postgres"); err != nil {
		t.Fatalf("missing legacy table should not require a backfill: %v", err)
	}
	if err := mock.ExpectationsWereMet(); err != nil {
		t.Fatalf("unexpected migration query: %v", err)
	}
}