// Copyright 2019 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package executor_test

import (
	"context"
	"math/rand"
	"testing"

	"github.com/pingcap/tidb/testkit"
)

func TestBatchInsertWithOnDuplicate(t *testing.T) {
	store := testkit.CreateMockStore(t)

	tk := testkit.NewAsyncTestKit(t, store)
	// prepare schema.
	ctx := tk.OpenSession(context.Background(), "test")
	defer tk.CloseSession(ctx)
	tk.MustExec(ctx, "drop table if exists duplicate_test")
	tk.MustExec(ctx, "create table duplicate_test(id int auto_increment, k1 int, primary key(id), unique key uk(k1))")
	tk.MustExec(ctx, "insert into duplicate_test(k1) values(?),(?),(?),(?),(?)", permInt(5)...)

	tk.MustExec(ctx, "SET GLOBAL tidb_enable_batch_dml = 1")
	defer tk.MustExec(ctx, "SET GLOBAL tidb_enable_batch_dml = 0")

	tk.ConcurrentRun(
		3,
		2,
		// prepare data for each loop.
		func(ctx context.Context, tk *testkit.AsyncTestKit, concurrent int, currentLoop int) [][][]interface{} {
			var ii [][][]interface{}
			for i := 0; i < concurrent; i++ {
				ii = append(ii, [][]interface{}{permInt(7)})
			}
			return ii
		},
		// concurrent execute logic.
		func(ctx context.Context, tk *testkit.AsyncTestKit, input [][]interface{}) {
			tk.MustExec(ctx, "set @@session.tidb_batch_insert=1")
			tk.MustExec(ctx, "set @@session.tidb_dml_batch_size=1")
			_, _ = tk.Exec(ctx, "insert ignore into duplicate_test(k1) values (?),(?),(?),(?),(?),(?),(?)", input[0]...)
		},
		// check after all done.
		func(ctx context.Context, tk *testkit.AsyncTestKit) {
			tk.MustExec(ctx, "admin check table duplicate_test")
			tk.MustQuery(ctx, "select d1.id, d1.k1 from duplicate_test d1 ignore index(uk), duplicate_test d2 use index (uk) where d1.id = d2.id and d1.k1 <> d2.k1").Check(testkit.Rows())
		})
}

func permInt(n int) []interface{} {
	randPermSlice := rand.Perm(n)
	v := make([]interface{}, 0, len(randPermSlice))
	for _, i := range randPermSlice {
		v = append(v, i)
	}
	return v
}