// Copyright (C) 2019-2020 Zilliz. All rights reserved.
//
// 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 allocator

import (
	"context"
	"testing"

	"github.com/milvus-io/milvus/internal/proto/commonpb"
	"github.com/milvus-io/milvus/internal/proto/rootcoordpb"
	"github.com/stretchr/testify/assert"
)

type mockIDAllocator struct {
}

func (tso *mockIDAllocator) AllocID(ctx context.Context, req *rootcoordpb.AllocIDRequest) (*rootcoordpb.AllocIDResponse, error) {
	return &rootcoordpb.AllocIDResponse{
		Status: &commonpb.Status{
			ErrorCode: commonpb.ErrorCode_Success,
			Reason:    "",
		},
		ID:    int64(1),
		Count: req.Count,
	}, nil
}

func newMockIDAllocator() *mockIDAllocator {
	return &mockIDAllocator{}
}

func TestIDAllocator(t *testing.T) {
	ctx := context.Background()
	mockIDAllocator := newMockIDAllocator()

	idAllocator, err := NewIDAllocator(ctx, mockIDAllocator, int64(1))
	assert.Nil(t, err)
	err = idAllocator.Start()
	assert.Nil(t, err)

	idStart, idEnd, err := idAllocator.Alloc(20000)
	assert.Nil(t, err)
	assert.Equal(t, idStart, int64(1))
	assert.Equal(t, idEnd, int64(20001))

	id, err := idAllocator.AllocOne()
	assert.Nil(t, err)
	assert.Equal(t, id, int64(20001))

	id, err = idAllocator.AllocOne()
	assert.Nil(t, err)
	assert.Equal(t, id, int64(20002))
}