// Copyright 2020 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,
// See the License for the specific language governing permissions and
// limitations under the License.

package maxwell

import (
	"context"
	"testing"

	"github.com/pingcap/tiflow/cdc/entry"
	"github.com/pingcap/tiflow/cdc/model"
	"github.com/pingcap/tiflow/pkg/sink/codec/common"
	"github.com/stretchr/testify/require"
)

func TestMaxwellBatchCodec(t *testing.T) {
	helper := entry.NewSchemaTestHelper(t)
	defer helper.Close()

	ddlEvent := helper.DDL2Event("create table test.t(col1 int primary key)")
	dmlEvent := helper.DML2Event("insert into test.t values (10)", "test", "t")

	rowCases := [][]*model.RowChangedEvent{{dmlEvent}, {}}
	for _, cs := range rowCases {
		encoder := newBatchEncoder(&common.Config{})
		for _, row := range cs {
			err := encoder.AppendRowChangedEvent(context.Background(), "", row, nil)
			require.Nil(t, err)
		}
		messages := encoder.Build()
		if len(cs) == 0 {
			require.Nil(t, messages)
			continue
		}
		require.Len(t, messages, 1)
		require.Equal(t, len(cs), messages[0].GetRowsCount())
	}

	ddlCases := [][]*model.DDLEvent{{ddlEvent}}
	for _, cs := range ddlCases {
		encoder := newBatchEncoder(&common.Config{})
		for _, ddl := range cs {
			msg, err := encoder.EncodeDDLEvent(ddl)
			require.Nil(t, err)
			require.NotNil(t, msg)
		}
	}
}

func TestMaxwellAppendRowChangedEventWithCallback(t *testing.T) {
	encoder := newBatchEncoder(&common.Config{})
	require.NotNil(t, encoder)

	helper := entry.NewSchemaTestHelper(t)
	defer helper.Close()

	_ = helper.DDL2Event("create table test.t(col1 varchar(255) primary key)")
	row := helper.DML2Event("insert into test.t values ('aa')", "test", "t")
	count := 0

	tests := []struct {
		row      *model.RowChangedEvent
		callback func()
	}{
		{
			row: row,
			callback: func() {
				count += 1
			},
		},
		{
			row: row,
			callback: func() {
				count += 2
			},
		},
		{
			row: row,
			callback: func() {
				count += 3
			},
		},
		{
			row: row,
			callback: func() {
				count += 4
			},
		},
		{
			row: row,
			callback: func() {
				count += 5
			},
		},
	}

	// Empty build makes sure that the callback build logic not broken.
	msgs := encoder.Build()
	require.Len(t, msgs, 0, "no message should be built and no panic")

	// Append the events.
	for _, test := range tests {
		err := encoder.AppendRowChangedEvent(context.Background(), "", test.row, test.callback)
		require.Nil(t, err)
	}
	require.Equal(t, 0, count, "nothing should be called")

	msgs = encoder.Build()
	require.Len(t, msgs, 1, "expected one message")
	msgs[0].Callback()
	require.Equal(t, 15, count, "expected all callbacks to be called")
}