// Copyright 2021 TiKV Authors
//
// 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.

// NOTE: The code in this file is based on code from the
// TiDB project, licensed under the Apache License v 2.0
//
// https://github.com/pingcap/tidb/tree/cc5e161ac06827589c4966674597c137cc9e809c/store/tikv/oracle/oracles/pd_test.go
//

// 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 oracles_test

import (
	"context"
	"math"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
	"github.com/tikv/client-go/v2/oracle"
	"github.com/tikv/client-go/v2/oracle/oracles"
)

func TestPDOracle_UntilExpired(t *testing.T) {
	lockAfter, lockExp := 10, 15
	o := oracles.NewEmptyPDOracle()
	start := time.Now()
	oracles.SetEmptyPDOracleLastTs(o, oracle.GoTimeToTS(start))
	lockTs := oracle.GoTimeToTS(start.Add(time.Duration(lockAfter)*time.Millisecond)) + 1
	waitTs := o.UntilExpired(lockTs, uint64(lockExp), &oracle.Option{TxnScope: oracle.GlobalTxnScope})
	assert.Equal(t, int64(lockAfter+lockExp), waitTs)
}

func TestPdOracle_GetStaleTimestamp(t *testing.T) {
	o := oracles.NewEmptyPDOracle()

	start := time.Now()
	oracles.SetEmptyPDOracleLastTs(o, oracle.GoTimeToTS(start))
	ts, err := o.GetStaleTimestamp(context.Background(), oracle.GlobalTxnScope, 10)
	assert.Nil(t, err)
	assert.WithinDuration(t, start.Add(-10*time.Second), oracle.GetTimeFromTS(ts), 2*time.Second)

	_, err = o.GetStaleTimestamp(context.Background(), oracle.GlobalTxnScope, 1e12)
	assert.NotNil(t, err)
	assert.Regexp(t, ".*invalid prevSecond.*", err.Error())

	_, err = o.GetStaleTimestamp(context.Background(), oracle.GlobalTxnScope, math.MaxUint64)
	assert.NotNil(t, err)
	assert.Regexp(t, ".*invalid prevSecond.*", err.Error())
}