package mysql

import (
	"database/sql"
	"net/url"
	"os"
	"testing"

	"github.com/amacneil/dbmate/pkg/dbmate"
	"github.com/amacneil/dbmate/pkg/dbutil"

	"github.com/stretchr/testify/require"
)

func testMySQLDriver(t *testing.T) *Driver {
	u := dbutil.MustParseURL(os.Getenv("MYSQL_TEST_URL"))
	drv, err := dbmate.New(u).GetDriver()
	require.NoError(t, err)

	return drv.(*Driver)
}

func prepTestMySQLDB(t *testing.T) *sql.DB {
	drv := testMySQLDriver(t)

	// drop any existing database
	err := drv.DropDatabase()
	require.NoError(t, err)

	// create database
	err = drv.CreateDatabase()
	require.NoError(t, err)

	// connect database
	db, err := drv.Open()
	require.NoError(t, err)

	return db
}

func TestGetDriver(t *testing.T) {
	db := dbmate.New(dbutil.MustParseURL("mysql://"))
	drvInterface, err := db.GetDriver()
	require.NoError(t, err)

	// driver should have URL and default migrations table set
	drv, ok := drvInterface.(*Driver)
	require.True(t, ok)
	require.Equal(t, db.DatabaseURL.String(), drv.databaseURL.String())
	require.Equal(t, "schema_migrations", drv.migrationsTableName)
}

func TestConnectionString(t *testing.T) {
	t.Run("defaults", func(t *testing.T) {
		u, err := url.Parse("mysql://host/foo")
		require.NoError(t, err)
		require.Equal(t, "", u.Port())

		s := connectionString(u)
		require.Equal(t, "tcp(host:3306)/foo?multiStatements=true", s)
	})

	t.Run("custom", func(t *testing.T) {
		u, err := url.Parse("mysql://bob:secret@host:123/foo?flag=on")
		require.NoError(t, err)
		require.Equal(t, "123", u.Port())

		s := connectionString(u)
		require.Equal(t, "bob:secret@tcp(host:123)/foo?flag=on&multiStatements=true", s)
	})

	t.Run("special chars", func(t *testing.T) {
		u, err := url.Parse("mysql://duhfsd7s:123!@123!@@host:123/foo?flag=on")
		require.NoError(t, err)
		require.Equal(t, "123", u.Port())

		s := connectionString(u)
		require.Equal(t, "duhfsd7s:123!@123!@@tcp(host:123)/foo?flag=on&multiStatements=true", s)
	})

	t.Run("url encoding", func(t *testing.T) {
		u, err := url.Parse("mysql://bob%2Balice:secret%5E%5B%2A%28%29@host:123/foo")
		require.NoError(t, err)
		require.Equal(t, "bob+alice:secret%5E%5B%2A%28%29", u.User.String())
		require.Equal(t, "123", u.Port())

		s := connectionString(u)
		// ensure that '+' is correctly encoded by url.PathUnescape as '+'
		// (not whitespace as url.QueryUnescape generates)
		require.Equal(t, "bob+alice:secret^[*()@tcp(host:123)/foo?multiStatements=true", s)
	})

	t.Run("socket", func(t *testing.T) {
		// test with no user/pass
		u, err := url.Parse("mysql:///foo?socket=/var/run/mysqld/mysqld.sock&flag=on")
		require.NoError(t, err)
		require.Equal(t, "", u.Host)

		s := connectionString(u)
		require.Equal(t, "unix(/var/run/mysqld/mysqld.sock)/foo?flag=on&multiStatements=true", s)

		// test with user/pass
		u, err = url.Parse("mysql://bob:secret@fakehost/foo?socket=/var/run/mysqld/mysqld.sock&flag=on")
		require.NoError(t, err)

		s = connectionString(u)
		require.Equal(t, "bob:secret@unix(/var/run/mysqld/mysqld.sock)/foo?flag=on&multiStatements=true", s)
	})
}

func TestMySQLCreateDropDatabase(t *testing.T) {
	drv := testMySQLDriver(t)

	// drop any existing database
	err := drv.DropDatabase()
	require.NoError(t, err)

	// create database
	err = drv.CreateDatabase()
	require.NoError(t, err)

	// check that database exists and we can connect to it
	func() {
		db, err := drv.Open()
		require.NoError(t, err)
		defer dbutil.MustClose(db)

		err = db.Ping()
		require.NoError(t, err)
	}()

	// drop the database
	err = drv.DropDatabase()
	require.NoError(t, err)

	// check that database no longer exists
	func() {
		db, err := drv.Open()
		require.NoError(t, err)
		defer dbutil.MustClose(db)

		err = db.Ping()
		require.Error(t, err)
		require.Regexp(t, "Unknown database 'dbmate_test'", err.Error())
	}()
}

func TestMySQLDumpSchema(t *testing.T) {
	drv := testMySQLDriver(t)
	drv.migrationsTableName = "test_migrations"

	// prepare database
	db := prepTestMySQLDB(t)
	defer dbutil.MustClose(db)
	err := drv.CreateMigrationsTable(db)
	require.NoError(t, err)

	// insert migration
	err = drv.InsertMigration(db, "abc1")
	require.NoError(t, err)
	err = drv.InsertMigration(db, "abc2")
	require.NoError(t, err)

	// DumpSchema should return schema
	schema, err := drv.DumpSchema(db)
	require.NoError(t, err)
	require.Contains(t, string(schema), "CREATE TABLE `test_migrations`")
	require.Contains(t, string(schema), "\n-- Dump completed\n\n"+
		"--\n"+
		"-- Dbmate schema migrations\n"+
		"--\n\n"+
		"LOCK TABLES `test_migrations` WRITE;\n"+
		"INSERT INTO `test_migrations` (version) VALUES\n"+
		"  ('abc1'),\n"+
		"  ('abc2');\n"+
		"UNLOCK TABLES;\n")

	// DumpSchema should return error if command fails
	drv.databaseURL.Path = "/fakedb"
	schema, err = drv.DumpSchema(db)
	require.Nil(t, schema)
	require.Error(t, err)
	require.Contains(t, err.Error(), "Unknown database 'fakedb'")
}

func TestMySQLDatabaseExists(t *testing.T) {
	drv := testMySQLDriver(t)

	// drop any existing database
	err := drv.DropDatabase()
	require.NoError(t, err)

	// DatabaseExists should return false
	exists, err := drv.DatabaseExists()
	require.NoError(t, err)
	require.Equal(t, false, exists)

	// create database
	err = drv.CreateDatabase()
	require.NoError(t, err)

	// DatabaseExists should return true
	exists, err = drv.DatabaseExists()
	require.NoError(t, err)
	require.Equal(t, true, exists)
}

func TestMySQLDatabaseExists_Error(t *testing.T) {
	drv := testMySQLDriver(t)
	drv.databaseURL.User = url.User("invalid")

	exists, err := drv.DatabaseExists()
	require.Error(t, err)
	require.Regexp(t, "Access denied for user 'invalid'@", err.Error())
	require.Equal(t, false, exists)
}

func TestMySQLCreateMigrationsTable(t *testing.T) {
	drv := testMySQLDriver(t)
	drv.migrationsTableName = "test_migrations"

	db := prepTestMySQLDB(t)
	defer dbutil.MustClose(db)

	// migrations table should not exist
	count := 0
	err := db.QueryRow("select count(*) from test_migrations").Scan(&count)
	require.Error(t, err)
	require.Regexp(t, "Table 'dbmate_test.test_migrations' doesn't exist", err.Error())

	// create table
	err = drv.CreateMigrationsTable(db)
	require.NoError(t, err)

	// migrations table should exist
	err = db.QueryRow("select count(*) from test_migrations").Scan(&count)
	require.NoError(t, err)

	// create table should be idempotent
	err = drv.CreateMigrationsTable(db)
	require.NoError(t, err)
}

func TestMySQLSelectMigrations(t *testing.T) {
	drv := testMySQLDriver(t)
	drv.migrationsTableName = "test_migrations"

	db := prepTestMySQLDB(t)
	defer dbutil.MustClose(db)

	err := drv.CreateMigrationsTable(db)
	require.NoError(t, err)

	_, err = db.Exec(`insert into test_migrations (version)
		values ('abc2'), ('abc1'), ('abc3')`)
	require.NoError(t, err)

	migrations, err := drv.SelectMigrations(db, -1)
	require.NoError(t, err)
	require.Equal(t, true, migrations["abc1"])
	require.Equal(t, true, migrations["abc2"])
	require.Equal(t, true, migrations["abc2"])

	// test limit param
	migrations, err = drv.SelectMigrations(db, 1)
	require.NoError(t, err)
	require.Equal(t, true, migrations["abc3"])
	require.Equal(t, false, migrations["abc1"])
	require.Equal(t, false, migrations["abc2"])
}

func TestMySQLInsertMigration(t *testing.T) {
	drv := testMySQLDriver(t)
	drv.migrationsTableName = "test_migrations"

	db := prepTestMySQLDB(t)
	defer dbutil.MustClose(db)

	err := drv.CreateMigrationsTable(db)
	require.NoError(t, err)

	count := 0
	err = db.QueryRow("select count(*) from test_migrations").Scan(&count)
	require.NoError(t, err)
	require.Equal(t, 0, count)

	// insert migration
	err = drv.InsertMigration(db, "abc1")
	require.NoError(t, err)

	err = db.QueryRow("select count(*) from test_migrations where version = 'abc1'").
		Scan(&count)
	require.NoError(t, err)
	require.Equal(t, 1, count)
}

func TestMySQLDeleteMigration(t *testing.T) {
	drv := testMySQLDriver(t)
	drv.migrationsTableName = "test_migrations"

	db := prepTestMySQLDB(t)
	defer dbutil.MustClose(db)

	err := drv.CreateMigrationsTable(db)
	require.NoError(t, err)

	_, err = db.Exec(`insert into test_migrations (version)
		values ('abc1'), ('abc2')`)
	require.NoError(t, err)

	err = drv.DeleteMigration(db, "abc2")
	require.NoError(t, err)

	count := 0
	err = db.QueryRow("select count(*) from test_migrations").Scan(&count)
	require.NoError(t, err)
	require.Equal(t, 1, count)
}

func TestMySQLPing(t *testing.T) {
	drv := testMySQLDriver(t)

	// drop any existing database
	err := drv.DropDatabase()
	require.NoError(t, err)

	// ping database
	err = drv.Ping()
	require.NoError(t, err)

	// ping invalid host should return error
	drv.databaseURL.Host = "mysql:404"
	err = drv.Ping()
	require.Error(t, err)
	require.Contains(t, err.Error(), "connect: connection refused")
}

func TestMySQLQuotedMigrationsTableName(t *testing.T) {
	t.Run("default name", func(t *testing.T) {
		drv := testMySQLDriver(t)
		name := drv.quotedMigrationsTableName()
		require.Equal(t, "`schema_migrations`", name)
	})

	t.Run("custom name", func(t *testing.T) {
		drv := testMySQLDriver(t)
		drv.migrationsTableName = "fooMigrations"

		name := drv.quotedMigrationsTableName()
		require.Equal(t, "`fooMigrations`", name)
	})
}