package migrate_test

/*
import (
	. "gopkg.in/check.v1"
)


type MigrateSuite struct {
	conn *pgx.Conn
}

func Test(t *testing.T) { TestingT(t) }

var _ = Suite(&MigrateSuite{})

var versionTable string = "schema_version_non_default"

func (s *MigrateSuite) SetUpTest(c *C) {
	var err error
	s.conn, err = pgx.Connect(*defaultConnectionParameters)
	c.Assert(err, IsNil)

	s.cleanupSampleMigrator(c)
}

func (s *MigrateSuite) currentVersion(c *C) int32 {
	var n int32
	err := s.conn.QueryRow("select version from " + versionTable).Scan(&n)
	c.Assert(err, IsNil)
	return n
}

func (s *MigrateSuite) Exec(c *C, sql string, arguments ...interface{}) pgx.CommandTag {
	commandTag, err := s.conn.Exec(sql, arguments...)
	c.Assert(err, IsNil)
	return commandTag
}

func (s *MigrateSuite) tableExists(c *C, tableName string) bool {
	var exists bool
	err := s.conn.QueryRow(
		"select exists(select 1 from information_schema.tables where table_catalog=$1 and table_name=$2)",
		defaultConnectionParameters.Database,
		tableName,
	).Scan(&exists)
	c.Assert(err, IsNil)
	return exists
}

func (s *MigrateSuite) createEmptyMigrator(c *C) *migrate.Migrator {
	var err error
	m, err := migrate.NewMigrator(s.conn, versionTable)
	c.Assert(err, IsNil)
	return m
}

func (s *MigrateSuite) createSampleMigrator(c *C) *migrate.Migrator {
	m := s.createEmptyMigrator(c)
	m.AppendMigration("Create t1", "create table t1(id serial);", "drop table t1;")
	m.AppendMigration("Create t2", "create table t2(id serial);", "drop table t2;")
	m.AppendMigration("Create t3", "create table t3(id serial);", "drop table t3;")
	return m
}

func (s *MigrateSuite) cleanupSampleMigrator(c *C) {
	tables := []string{versionTable, "t1", "t2", "t3"}
	for _, table := range tables {
		s.Exec(c, "drop table if exists "+table)
	}
}

func (s *MigrateSuite) TestNewMigrator(c *C) {
	var m *migrate.Migrator
	var err error

	// Initial run
	m, err = migrate.NewMigrator(s.conn, versionTable)
	c.Assert(err, IsNil)

	// Creates version table
	schemaVersionExists := s.tableExists(c, versionTable)
	c.Assert(schemaVersionExists, Equals, true)

	// Succeeds when version table is already created
	m, err = migrate.NewMigrator(s.conn, versionTable)
	c.Assert(err, IsNil)

	initialVersion, err := m.GetCurrentVersion()
	c.Assert(err, IsNil)
	c.Assert(initialVersion, Equals, int32(0))
}

func (s *MigrateSuite) TestAppendMigration(c *C) {
	m := s.createEmptyMigrator(c)

	name := "Create t"
	upSQL := "create t..."
	downSQL := "drop t..."
	m.AppendMigration(name, upSQL, downSQL)

	c.Assert(len(m.Migrations), Equals, 1)
	c.Assert(m.Migrations[0].Name, Equals, name)
	c.Assert(m.Migrations[0].UpSQL, Equals, upSQL)
	c.Assert(m.Migrations[0].DownSQL, Equals, downSQL)
}

func (s *MigrateSuite) TestLoadMigrationsMissingDirectory(c *C) {
	m := s.createEmptyMigrator(c)
	err := m.LoadMigrations("testdata/missing")
	c.Assert(err, ErrorMatches, "open testdata/missing: no such file or directory")
}

func (s *MigrateSuite) TestLoadMigrationsEmptyDirectory(c *C) {
	m := s.createEmptyMigrator(c)
	err := m.LoadMigrations("testdata/empty")
	c.Assert(err, ErrorMatches, "No migrations found at testdata/empty")
}

func (s *MigrateSuite) TestFindMigrationsWithGaps(c *C) {
	_, err := migrate.FindMigrations("testdata/gap")
	c.Assert(err, ErrorMatches, "Missing migration 2")
}

func (s *MigrateSuite) TestFindMigrationsWithDuplicate(c *C) {
	_, err := migrate.FindMigrations("testdata/duplicate")
	c.Assert(err, ErrorMatches, "Duplicate migration 2")
}

func (s *MigrateSuite) TestLoadMigrations(c *C) {
	m := s.createEmptyMigrator(c)
	m.Data = map[string]interface{}{"prefix": "foo"}
	err := m.LoadMigrations("testdata/sample")
	c.Assert(err, IsNil)
	c.Assert(m.Migrations, HasLen, 5)

	c.Check(m.Migrations[0].Name, Equals, "001_create_t1.sql")
	c.Check(m.Migrations[0].UpSQL, Equals, `create table t1(
  id serial primary key
);`)
	c.Check(m.Migrations[0].DownSQL, Equals, "drop table t1;")

	c.Check(m.Migrations[1].Name, Equals, "002_create_t2.sql")
	c.Check(m.Migrations[1].UpSQL, Equals, `create table t2(
  id serial primary key
);`)
	c.Check(m.Migrations[1].DownSQL, Equals, "drop table t2;")

	c.Check(m.Migrations[2].Name, Equals, "003_irreversible.sql")
	c.Check(m.Migrations[2].UpSQL, Equals, "drop table t2;")
	c.Check(m.Migrations[2].DownSQL, Equals, "")

	c.Check(m.Migrations[3].Name, Equals, "004_data_interpolation.sql")
	c.Check(m.Migrations[3].UpSQL, Equals, "create table foo_bar(id serial primary key);")
	c.Check(m.Migrations[3].DownSQL, Equals, "drop table foo_bar;")
}

func (s *MigrateSuite) TestLoadMigrationsNoForward(c *C) {
	var err error
	m, err := migrate.NewMigrator(s.conn, versionTable)
	c.Assert(err, IsNil)

	m.Data = map[string]interface{}{"prefix": "foo"}
	err = m.LoadMigrations("testdata/noforward")
	c.Assert(err, Equals, migrate.ErrNoFwMigration)
}

func (s *MigrateSuite) TestMigrate(c *C) {
	m := s.createSampleMigrator(c)

	err := m.Migrate()
	c.Assert(err, IsNil)
	currentVersion := s.currentVersion(c)
	c.Assert(currentVersion, Equals, int32(3))
}

func (s *MigrateSuite) TestMigrateToLifeCycle(c *C) {
	m := s.createSampleMigrator(c)

	var onStartCallUpCount int
	var onStartCallDownCount int
	m.OnStart = func(_ int32, _, direction, _ string) {
		switch direction {
		case "up":
			onStartCallUpCount++
		case "down":
			onStartCallDownCount++
		default:
			c.Fatalf("Unexpected direction: %s", direction)
		}
	}

	// Migrate from 0 up to 1
	err := m.MigrateTo(1)
	c.Assert(err, IsNil)
	currentVersion := s.currentVersion(c)
	c.Assert(currentVersion, Equals, int32(1))
	c.Assert(s.tableExists(c, "t1"), Equals, true)
	c.Assert(s.tableExists(c, "t2"), Equals, false)
	c.Assert(s.tableExists(c, "t3"), Equals, false)
	c.Assert(onStartCallUpCount, Equals, 1)
	c.Assert(onStartCallDownCount, Equals, 0)

	// Migrate from 1 up to 3
	err = m.MigrateTo(3)
	c.Assert(err, IsNil)
	currentVersion = s.currentVersion(c)
	c.Assert(currentVersion, Equals, int32(3))
	c.Assert(s.tableExists(c, "t1"), Equals, true)
	c.Assert(s.tableExists(c, "t2"), Equals, true)
	c.Assert(s.tableExists(c, "t3"), Equals, true)
	c.Assert(onStartCallUpCount, Equals, 3)
	c.Assert(onStartCallDownCount, Equals, 0)

	// Migrate from 3 to 3 is no-op
	err = m.MigrateTo(3)
	c.Assert(err, IsNil)
	currentVersion = s.currentVersion(c)
	c.Assert(s.tableExists(c, "t1"), Equals, true)
	c.Assert(s.tableExists(c, "t2"), Equals, true)
	c.Assert(s.tableExists(c, "t3"), Equals, true)
	c.Assert(onStartCallUpCount, Equals, 3)
	c.Assert(onStartCallDownCount, Equals, 0)

	// Migrate from 3 down to 1
	err = m.MigrateTo(1)
	c.Assert(err, IsNil)
	currentVersion = s.currentVersion(c)
	c.Assert(currentVersion, Equals, int32(1))
	c.Assert(s.tableExists(c, "t1"), Equals, true)
	c.Assert(s.tableExists(c, "t2"), Equals, false)
	c.Assert(s.tableExists(c, "t3"), Equals, false)
	c.Assert(onStartCallUpCount, Equals, 3)
	c.Assert(onStartCallDownCount, Equals, 2)

	// Migrate from 1 down to 0
	err = m.MigrateTo(0)
	c.Assert(err, IsNil)
	currentVersion = s.currentVersion(c)
	c.Assert(currentVersion, Equals, int32(0))
	c.Assert(s.tableExists(c, "t1"), Equals, false)
	c.Assert(s.tableExists(c, "t2"), Equals, false)
	c.Assert(s.tableExists(c, "t3"), Equals, false)
	c.Assert(onStartCallUpCount, Equals, 3)
	c.Assert(onStartCallDownCount, Equals, 3)

	// Migrate back up to 3
	err = m.MigrateTo(3)
	c.Assert(err, IsNil)
	currentVersion = s.currentVersion(c)
	c.Assert(currentVersion, Equals, int32(3))
	c.Assert(s.tableExists(c, "t1"), Equals, true)
	c.Assert(s.tableExists(c, "t2"), Equals, true)
	c.Assert(s.tableExists(c, "t3"), Equals, true)
	c.Assert(onStartCallUpCount, Equals, 6)
	c.Assert(onStartCallDownCount, Equals, 3)
}

func (s *MigrateSuite) TestMigrateToBoundaries(c *C) {
	m := s.createSampleMigrator(c)

	// Migrate to -1 is error
	err := m.MigrateTo(-1)
	c.Assert(err, ErrorMatches, "destination version -1 is outside the valid versions of 0 to 3")

	// Migrate past end is error
	err = m.MigrateTo(int32(len(m.Migrations)) + 1)
	c.Assert(err, ErrorMatches, "destination version 4 is outside the valid versions of 0 to 3")

	// When schema version says it is negative
	s.Exec(c, "update "+versionTable+" set version=-1")
	err = m.MigrateTo(int32(1))
	c.Assert(err, ErrorMatches, "current version -1 is outside the valid versions of 0 to 3")

	// When schema version says it is negative
	s.Exec(c, "update "+versionTable+" set version=4")
	err = m.MigrateTo(int32(1))
	c.Assert(err, ErrorMatches, "current version 4 is outside the valid versions of 0 to 3")
}

func (s *MigrateSuite) TestMigrateToIrreversible(c *C) {
	m := s.createEmptyMigrator(c)
	m.AppendMigration("Foo", "drop table if exists t3", "")

	err := m.MigrateTo(1)
	c.Assert(err, IsNil)

	err = m.MigrateTo(0)
	c.Assert(err, ErrorMatches, "Irreversible migration: 1 - Foo")
}

func (s *MigrateSuite) TestMigrateToDisableTx(c *C) {
	m, err := migrate.NewMigratorEx(s.conn, versionTable, &migrate.MigratorOptions{DisableTx: true})
	c.Assert(err, IsNil)
	m.AppendMigration("Create t1", "create table t1(id serial);", "drop table t1;")
	m.AppendMigration("Create t2", "create table t2(id serial);", "drop table t2;")
	m.AppendMigration("Create t3", "create table t3(id serial);", "drop table t3;")

	tx, err := s.conn.Begin()
	c.Assert(err, IsNil)

	err = m.MigrateTo(3)
	c.Assert(err, IsNil)
	currentVersion := s.currentVersion(c)
	c.Assert(currentVersion, Equals, int32(3))
	c.Assert(s.tableExists(c, "t1"), Equals, true)
	c.Assert(s.tableExists(c, "t2"), Equals, true)
	c.Assert(s.tableExists(c, "t3"), Equals, true)

	err = tx.Rollback()
	c.Assert(err, IsNil)
	currentVersion = s.currentVersion(c)
	c.Assert(currentVersion, Equals, int32(0))
	c.Assert(s.tableExists(c, "t1"), Equals, false)
	c.Assert(s.tableExists(c, "t2"), Equals, false)
	c.Assert(s.tableExists(c, "t3"), Equals, false)
}

func Example_OnStartMigrationProgressLogging() {
	conn, err := pgx.Connect(*defaultConnectionParameters)
	if err != nil {
		fmt.Printf("Unable to establish connection: %v", err)
		return
	}

	// Clear any previous runs
	if _, err = conn.Exec("drop table if exists schema_version"); err != nil {
		fmt.Printf("Unable to drop schema_version table: %v", err)
		return
	}

	var m *migrate.Migrator
	m, err = migrate.NewMigrator(conn, "schema_version")
	if err != nil {
		fmt.Printf("Unable to create migrator: %v", err)
		return
	}

	m.OnStart = func(_ int32, name, direction, _ string) {
		fmt.Printf("Migrating %s: %s", direction, name)
	}

	m.AppendMigration("create a table", "create temporary table foo(id serial primary key)", "")

	if err = m.Migrate(); err != nil {
		fmt.Printf("Unexpected failure migrating: %v", err)
		return
	}
	// Output:
	// Migrating up: create a table
}
*/