// 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 admin_test

import (
	"strconv"
	"testing"

	"github.com/pingcap/tidb/sessionctx/variable"
	"github.com/pingcap/tidb/tablecodec"
	"github.com/pingcap/tidb/testkit"
	"github.com/stretchr/testify/require"
)

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

	// test NULL value.
	tk := testkit.NewTestKit(t, store)
	tk.MustExec("use test")
	// test index column has pk-handle column
	tk.MustExec("drop table if exists t")
	tk.MustExec("create table t(a bigint unsigned primary key, b int, c int, index idx(a, b));")
	tk.MustExec("insert into t values(1, 1, 1)")
	tk.MustExec("admin check table t")

	// test for add index on the later added columns.
	tk.MustExec("drop table if exists t1;")
	tk.MustExec("CREATE TABLE t1 (c1 int);")
	tk.MustExec("INSERT INTO t1 SET c1 = 1;")
	tk.MustExec("ALTER TABLE t1 ADD COLUMN cc1 CHAR(36)    NULL DEFAULT '';")
	tk.MustExec("ALTER TABLE t1 ADD COLUMN cc2 VARCHAR(36) NULL DEFAULT ''")
	tk.MustExec("ALTER TABLE t1 ADD INDEX idx1 (cc1);")
	tk.MustExec("ALTER TABLE t1 ADD INDEX idx2 (cc2);")
	tk.MustExec("ALTER TABLE t1 engine=innodb;")
	tk.MustExec("admin check table t1;")

	// For add index on virtual column
	tk.MustExec("drop table if exists t1;")
	tk.MustExec(`create table t1 (
		a int             as (JSON_EXTRACT(k,'$.a')),
		c double          as (JSON_EXTRACT(k,'$.c')),
		d decimal(20,10)  as (JSON_EXTRACT(k,'$.d')),
		e char(10)        as (JSON_EXTRACT(k,'$.e')),
		f date            as (JSON_EXTRACT(k,'$.f')),
		g time            as (JSON_EXTRACT(k,'$.g')),
		h datetime        as (JSON_EXTRACT(k,'$.h')),
		i timestamp       as (JSON_EXTRACT(k,'$.i')),
		j year            as (JSON_EXTRACT(k,'$.j')),
		k json);`)

	tk.MustExec("insert into t1 set k='{\"a\": 100,\"c\":1.234,\"d\":1.2340000000,\"e\":\"abcdefg\",\"f\":\"2018-09-28\",\"g\":\"12:59:59\",\"h\":\"2018-09-28 12:59:59\",\"i\":\"2018-09-28 16:40:33\",\"j\":\"2018\"}';")
	tk.MustExec("alter table t1 add index idx_a(a);")
	tk.MustExec("alter table t1 add index idx_c(c);")
	tk.MustExec("alter table t1 add index idx_d(d);")
	tk.MustExec("alter table t1 add index idx_e(e);")
	tk.MustExec("alter table t1 add index idx_f(f);")
	tk.MustExec("alter table t1 add index idx_g(g);")
	tk.MustExec("alter table t1 add index idx_h(h);")
	tk.MustExec("alter table t1 add index idx_j(j);")
	tk.MustExec("alter table t1 add index idx_i(i);")
	tk.MustExec("alter table t1 add index idx_m(a,c,d,e,f,g,h,i,j);")
	tk.MustExec("admin check table t1;")
}

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

	tk := testkit.NewTestKit(t, store)
	tk.MustExec("drop database if exists admin_check_table_clustered_index;")
	tk.MustExec("create database admin_check_table_clustered_index;")
	tk.MustExec("use admin_check_table_clustered_index;")

	tk.Session().GetSessionVars().EnableClusteredIndex = variable.ClusteredIndexDefModeOn

	tk.MustExec("create table t (a bigint, b varchar(255), c int, primary key (a, b), index idx_0(a, b), index idx_1(b, c));")
	tk.MustExec("insert into t values (1, '1', 1);")
	tk.MustExec("insert into t values (2, '2', 2);")
	tk.MustExec("admin check table t;")
	for i := 3; i < 200; i++ {
		tk.MustExec("insert into t values (?, ?, ?);", i, strconv.Itoa(i), i)
	}
	tk.MustExec("admin check table t;")

	// Test back filled created index data.
	tk.MustExec("create index idx_2 on t (c);")
	tk.MustExec("admin check table t;")
	tk.MustExec("create index idx_3 on t (a,c);")
	tk.MustExec("admin check table t;")

	// Test newly created columns.
	tk.MustExec("alter table t add column e char(36);")
	tk.MustExec("admin check table t;")
	tk.MustExec("alter table t add column d char(36) NULL DEFAULT '';")
	tk.MustExec("admin check table t;")

	tk.MustExec("insert into t values (1000, '1000', 1000, '1000', '1000');")
	tk.MustExec("admin check table t;")
}

func TestAdminCheckTableCorrupted(t *testing.T) {
	store := testkit.CreateMockStore(t)
	tk := testkit.NewTestKit(t, store)
	tk.MustExec("use test")
	tk.MustExec("drop table if exists t")
	tk.MustExec("create table t(id int, v int, UNIQUE KEY i1(id, v))")
	tk.MustExec("begin")
	tk.MustExec("insert into t values (1, 1)")

	txn, err := tk.Session().Txn(false)
	require.NoError(t, err)
	memBuffer := txn.GetMemBuffer()
	it, err := memBuffer.Iter(nil, nil)
	require.NoError(t, err)
	for it.Valid() {
		if tablecodec.IsRecordKey(it.Key()) && len(it.Value()) > 0 {
			value := make([]byte, len(it.Value()))
			key := make([]byte, len(it.Key()))
			copy(key, it.Key())
			copy(value, it.Value())
			key[len(key)-1] += 1
			memBuffer.Set(key, value)
		}
		err = it.Next()
		require.NoError(t, err)
	}

	tk.MustExec("commit")
	err = tk.ExecToErr("admin check table t")
	require.Error(t, err)
}