/*
Copyright IBM Corp. All Rights Reserved.

SPDX-License-Identifier: Apache-2.0
*/

package validation

import (
	"testing"

	"github.com/hyperledger/fabric-protos-go-apiv2/ledger/rwset/kvrwset"
	"github.com/hyperledger/fabric/core/ledger/internal/version"
	"github.com/hyperledger/fabric/core/ledger/kvledger/txmgmt/rwsetutil"
	"github.com/hyperledger/fabric/core/ledger/kvledger/txmgmt/statedb"
	"github.com/hyperledger/fabric/core/ledger/kvledger/txmgmt/statedb/stateleveldb"
	"github.com/stretchr/testify/require"
)

func TestRangeQueryBoundaryConditions(t *testing.T) {
	batch := statedb.NewUpdateBatch()
	batch.Put("ns1", "key1", []byte("value1"), version.NewHeight(1, 0))
	batch.Put("ns1", "key2", []byte("value2"), version.NewHeight(1, 1))
	batch.Put("ns1", "key3", []byte("value3"), version.NewHeight(1, 2))
	batch.Put("ns1", "key4", []byte("value4"), version.NewHeight(1, 3))
	batch.Put("ns1", "key5", []byte("value5"), version.NewHeight(1, 4))

	testcase1 := "NoResults"
	rqi1 := &kvrwset.RangeQueryInfo{StartKey: "key7", EndKey: "key10", ItrExhausted: true}
	rwsetutil.SetRawReads(rqi1, []*kvrwset.KVRead{})
	testRangeQuery(t, testcase1, batch, version.NewHeight(1, 4), "ns1", rqi1, true)

	testcase2 := "NoResultsDuringValidation"
	rqi2 := &kvrwset.RangeQueryInfo{StartKey: "key7", EndKey: "key10", ItrExhausted: true}
	rwsetutil.SetRawReads(rqi2, []*kvrwset.KVRead{rwsetutil.NewKVRead("key8", version.NewHeight(1, 8))})
	testRangeQuery(t, testcase2, batch, version.NewHeight(1, 4), "ns1", rqi2, false)

	testcase3 := "OneExtraTailingResultsDuringValidation"
	rqi3 := &kvrwset.RangeQueryInfo{StartKey: "key1", EndKey: "key4", ItrExhausted: true}
	rwsetutil.SetRawReads(rqi3, []*kvrwset.KVRead{
		rwsetutil.NewKVRead("key1", version.NewHeight(1, 0)),
		rwsetutil.NewKVRead("key2", version.NewHeight(1, 1)),
	})
	testRangeQuery(t, testcase3, batch, version.NewHeight(1, 4), "ns1", rqi3, false)

	testcase4 := "TwoExtraTailingResultsDuringValidation"
	rqi4 := &kvrwset.RangeQueryInfo{StartKey: "key1", EndKey: "key5", ItrExhausted: true}
	rwsetutil.SetRawReads(rqi4, []*kvrwset.KVRead{
		rwsetutil.NewKVRead("key1", version.NewHeight(1, 0)),
		rwsetutil.NewKVRead("key2", version.NewHeight(1, 1)),
	})
	testRangeQuery(t, testcase4, batch, version.NewHeight(1, 4), "ns1", rqi4, false)
}

func testRangeQuery(t *testing.T, testcase string, stateData *statedb.UpdateBatch, savepoint *version.Height,
	ns string, rqi *kvrwset.RangeQueryInfo, expectedResult bool) {
	t.Run(testcase, func(t *testing.T) {
		testDBEnv := stateleveldb.NewTestVDBEnv(t)
		defer testDBEnv.Cleanup()
		db, err := testDBEnv.DBProvider.GetDBHandle("TestDB", nil)
		require.NoError(t, err)
		if stateData != nil {
			require.NoError(t, db.ApplyUpdates(stateData, savepoint))
		}

		itr, err := db.GetStateRangeScanIterator(ns, rqi.StartKey, rqi.EndKey)
		require.NoError(t, err)
		qv := &rangeQueryResultsValidator{}
		require.NoError(t, qv.init(rqi, itr))
		isValid, err := qv.validate()
		require.NoError(t, err)
		require.Equal(t, expectedResult, isValid)
	})
}
