// Copyright 2019-present Facebook Inc. All rights reserved.
// This source code is licensed under the Apache 2.0 license found
// in the LICENSE file in the root directory of this source tree.

package schema

import (
	"context"
	"os"
	"path/filepath"
	"strconv"
	"testing"
	"time"

	"ariga.io/atlas/sql/migrate"
	"entgo.io/ent/dialect"
	"entgo.io/ent/dialect/sql"
	"github.com/DATA-DOG/go-sqlmock"
	"github.com/stretchr/testify/require"

	_ "github.com/mattn/go-sqlite3"
)

func TestMigrateHookOmitTable(t *testing.T) {
	db, mk, err := sqlmock.New()
	require.NoError(t, err)

	tables := []*Table{{Name: "users"}, {Name: "pets"}}
	mock := mysqlMock{mk}
	mock.start("5.7.23")
	mock.tableExists("pets", false)
	mock.ExpectExec(escape("CREATE TABLE IF NOT EXISTS `pets`() CHARACTER SET utf8mb4 COLLATE utf8mb4_bin")).
		WillReturnResult(sqlmock.NewResult(0, 1))
	mock.ExpectCommit()

	m, err := NewMigrate(sql.OpenDB("mysql", db), WithHooks(func(next Creator) Creator {
		return CreateFunc(func(ctx context.Context, tables ...*Table) error {
			return next.Create(ctx, tables[1])
		})
	}))
	require.NoError(t, err)
	err = m.Create(context.Background(), tables...)
	require.NoError(t, err)
}

func TestMigrateHookAddTable(t *testing.T) {
	db, mk, err := sqlmock.New()
	require.NoError(t, err)

	tables := []*Table{{Name: "users"}}
	mock := mysqlMock{mk}
	mock.start("5.7.23")
	mock.tableExists("users", false)
	mock.ExpectExec(escape("CREATE TABLE IF NOT EXISTS `users`() CHARACTER SET utf8mb4 COLLATE utf8mb4_bin")).
		WillReturnResult(sqlmock.NewResult(0, 1))
	mock.tableExists("pets", false)
	mock.ExpectExec(escape("CREATE TABLE IF NOT EXISTS `pets`() CHARACTER SET utf8mb4 COLLATE utf8mb4_bin")).
		WillReturnResult(sqlmock.NewResult(0, 1))
	mock.ExpectCommit()

	m, err := NewMigrate(sql.OpenDB("mysql", db), WithHooks(func(next Creator) Creator {
		return CreateFunc(func(ctx context.Context, tables ...*Table) error {
			return next.Create(ctx, tables[0], &Table{Name: "pets"})
		})
	}))
	require.NoError(t, err)
	err = m.Create(context.Background(), tables...)
	require.NoError(t, err)
}

func TestMigrate_Diff(t *testing.T) {
	db, err := sql.Open(dialect.SQLite, "file:test?mode=memory&_fk=1")
	require.NoError(t, err)

	p := t.TempDir()
	d, err := migrate.NewLocalDir(p)
	require.NoError(t, err)

	m, err := NewMigrate(db, WithDir(d))
	require.NoError(t, err)
	require.NoError(t, m.Diff(context.Background(), &Table{Name: "users"}))
	v := strconv.FormatInt(time.Now().Unix(), 10)
	requireFileEqual(t, filepath.Join(p, v+"_changes.up.sql"), "CREATE TABLE `users` (, PRIMARY KEY ());\n")
	requireFileEqual(t, filepath.Join(p, v+"_changes.down.sql"), "DROP TABLE `users`;\n")
	require.NoFileExists(t, filepath.Join(p, "atlas.sum"))
}

func requireFileEqual(t *testing.T, name, contents string) {
	c, err := os.ReadFile(name)
	require.NoError(t, err)
	require.Equal(t, contents, string(c))
}