package migrate

import (
	"testing"

	"github.com/jmoiron/sqlx"
	_ "github.com/lib/pq"
	"github.com/stretchr/testify/assert"

	"scroll-tech/common/docker"

	"scroll-tech/database"
)

var (
	base *docker.App
	pgDB *sqlx.DB
)

func initEnv(t *testing.T) error {
	// Start db container.
	base.RunDBImage(t)

	// Create db orm handler.
	factory, err := database.NewOrmFactory(base.DBConfig)
	if err != nil {
		return err
	}
	pgDB = factory.GetDB()
	return nil
}

func TestMigrate(t *testing.T) {
	base = docker.NewDockerApp()
	if err := initEnv(t); err != nil {
		t.Fatal(err)
	}

	t.Run("testCurrent", testCurrent)
	t.Run("testStatus", testStatus)
	t.Run("testResetDB", testResetDB)
	t.Run("testMigrate", testMigrate)
	t.Run("testRollback", testRollback)

	t.Cleanup(func() {
		base.Free()
	})
}

func testCurrent(t *testing.T) {
	cur, err := Current(pgDB.DB)
	assert.NoError(t, err)
	assert.Equal(t, int64(0), cur)
}

func testStatus(t *testing.T) {
	status := Status(pgDB.DB)
	assert.NoError(t, status)
}

func testResetDB(t *testing.T) {
	assert.NoError(t, ResetDB(pgDB.DB))
	cur, err := Current(pgDB.DB)
	assert.NoError(t, err)
	// total number of tables.
	assert.Equal(t, int64(16), cur)
}

func testMigrate(t *testing.T) {
	assert.NoError(t, Migrate(pgDB.DB))
	cur, err := Current(pgDB.DB)
	assert.NoError(t, err)
	assert.Equal(t, int64(16), cur)
}

func testRollback(t *testing.T) {
	version, err := Current(pgDB.DB)
	assert.NoError(t, err)
	assert.Equal(t, int64(16), version)

	assert.NoError(t, Rollback(pgDB.DB, nil))

	cur, err := Current(pgDB.DB)
	assert.NoError(t, err)
	assert.Equal(t, version, cur+1)

	targetVersion := int64(0)
	assert.NoError(t, Rollback(pgDB.DB, &targetVersion))

	cur, err = Current(pgDB.DB)
	assert.NoError(t, err)
	assert.Equal(t, int64(0), cur)
}