/*
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements.  See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You 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 consumer

import (
	"fmt"
	"github.com/apache/rocketmq-client-go/primitive"
	. "github.com/smartystreets/goconvey/convey"
	"testing"
)

func TestAllocateByAveragely(t *testing.T) {
	Convey("Given message queues with a starting value", t, func() {
		queues := []*primitive.MessageQueue{
			{
				QueueId: 0,
			},
			{
				QueueId: 1,
			},
			{
				QueueId: 2,
			},
			{
				QueueId: 3,
			},
			{
				QueueId: 4,
			},
			{
				QueueId: 5,
			},
		}

		Convey("When params is empty", func() {
			result := AllocateByAveragely("testGroup", "", queues, []string{"192.168.24.1@default"})
			So(result, ShouldBeNil)

			result = AllocateByAveragely("testGroup", "192.168.24.1@default", nil, []string{"192.168.24.1@default"})
			So(result, ShouldBeNil)

			result = AllocateByAveragely("testGroup", "192.168.24.1@default", queues, nil)
			So(result, ShouldBeNil)
		})

		type testCase struct {
			currentCid    string
			mqAll         []*primitive.MessageQueue
			cidAll        []string
			expectedQueue []*primitive.MessageQueue
		}
		cases := []testCase{
			{
				currentCid: "192.168.24.1@default",
				mqAll:      queues,
				cidAll:     []string{"192.168.24.1@default", "192.168.24.2@default"},
				expectedQueue: []*primitive.MessageQueue{
					{
						QueueId: 0,
					},
					{
						QueueId: 1,
					},
					{
						QueueId: 2,
					},
				},
			},
			{
				currentCid: "192.168.24.2@default",
				mqAll:      queues,
				cidAll:     []string{"192.168.24.1@default", "192.168.24.2@default", "192.168.24.3@default"},
				expectedQueue: []*primitive.MessageQueue{
					{
						QueueId: 2,
					},
					{
						QueueId: 3,
					},
				},
			},
			{
				currentCid: "192.168.24.2@default",
				mqAll:      queues,
				cidAll:     []string{"192.168.24.1@default", "192.168.24.2@default", "192.168.24.3@default", "192.168.24.4@default"},
				expectedQueue: []*primitive.MessageQueue{
					{
						QueueId: 2,
					},
					{
						QueueId: 3,
					},
				},
			},
			{
				currentCid: "192.168.24.4@default",
				mqAll:      queues,
				cidAll:     []string{"192.168.24.1@default", "192.168.24.2@default", "192.168.24.3@default", "192.168.24.4@default"},
				expectedQueue: []*primitive.MessageQueue{
					{
						QueueId: 5,
					},
				},
			},
			{
				currentCid:    "192.168.24.7@default",
				mqAll:         queues,
				cidAll:        []string{"192.168.24.1@default", "192.168.24.2@default", "192.168.24.3@default", "192.168.24.4@default", "192.168.24.5@default", "192.168.24.6@default", "192.168.24.7@default"},
				expectedQueue: []*primitive.MessageQueue{},
			},
		}

		Convey("the result of AllocateByAveragely should be deep equal expectedQueue", func() {
			for _, value := range cases {
				result := AllocateByAveragely("testGroup", value.currentCid, value.mqAll, value.cidAll)
				So(result, ShouldResemble, value.expectedQueue)
			}
		})
	})
}

func TestAllocateByAveragelyCircle(t *testing.T) {
	Convey("Given message queues with a starting value", t, func() {
		queues := []*primitive.MessageQueue{
			{
				QueueId: 0,
			},
			{
				QueueId: 1,
			},
			{
				QueueId: 2,
			},
			{
				QueueId: 3,
			},
			{
				QueueId: 4,
			},
			{
				QueueId: 5,
			},
		}

		Convey("When params is empty", func() {
			result := AllocateByAveragelyCircle("testGroup", "", queues, []string{"192.168.24.1@default"})
			So(result, ShouldBeNil)

			result = AllocateByAveragelyCircle("testGroup", "192.168.24.1@default", nil, []string{"192.168.24.1@default"})
			So(result, ShouldBeNil)

			result = AllocateByAveragelyCircle("testGroup", "192.168.24.1@default", queues, nil)
			So(result, ShouldBeNil)
		})

		type testCase struct {
			currentCid    string
			mqAll         []*primitive.MessageQueue
			cidAll        []string
			expectedQueue []*primitive.MessageQueue
		}
		cases := []testCase{
			{
				currentCid: "192.168.24.1@default",
				mqAll:      queues,
				cidAll:     []string{"192.168.24.1@default", "192.168.24.2@default"},
				expectedQueue: []*primitive.MessageQueue{
					{
						QueueId: 0,
					},
					{
						QueueId: 2,
					},
					{
						QueueId: 4,
					},
				},
			},
			{
				currentCid: "192.168.24.2@default",
				mqAll:      queues,
				cidAll:     []string{"192.168.24.1@default", "192.168.24.2@default", "192.168.24.3@default"},
				expectedQueue: []*primitive.MessageQueue{
					{
						QueueId: 1,
					},
					{
						QueueId: 4,
					},
				},
			},
			{
				currentCid: "192.168.24.2@default",
				mqAll:      queues,
				cidAll:     []string{"192.168.24.1@default", "192.168.24.2@default", "192.168.24.3@default", "192.168.24.4@default"},
				expectedQueue: []*primitive.MessageQueue{
					{
						QueueId: 1,
					},
					{
						QueueId: 5,
					},
				},
			},
			{
				currentCid: "192.168.24.4@default",
				mqAll:      queues,
				cidAll:     []string{"192.168.24.1@default", "192.168.24.2@default", "192.168.24.3@default", "192.168.24.4@default"},
				expectedQueue: []*primitive.MessageQueue{
					{
						QueueId: 3,
					},
				},
			},
			{
				currentCid:    "192.168.24.7@default",
				mqAll:         queues,
				cidAll:        []string{"192.168.24.1@default", "192.168.24.2@default", "192.168.24.3@default", "192.168.24.4@default", "192.168.24.5@default", "192.168.24.6@default", "192.168.24.7@default"},
				expectedQueue: []*primitive.MessageQueue{},
			},
		}

		Convey("the result of AllocateByAveragelyCircle should be deep equal expectedQueue", func() {
			for _, value := range cases {
				result := AllocateByAveragelyCircle("testGroup", value.currentCid, value.mqAll, value.cidAll)
				So(result, ShouldResemble, value.expectedQueue)
			}
		})
	})
}

func TestAllocateByConfig(t *testing.T) {
	Convey("Given message queues with a starting value", t, func() {
		queues := []*primitive.MessageQueue{
			{
				QueueId: 0,
			},
			{
				QueueId: 1,
			},
			{
				QueueId: 2,
			},
			{
				QueueId: 3,
			},
			{
				QueueId: 4,
			},
			{
				QueueId: 5,
			},
		}

		strategy := AllocateByConfig(queues)
		result := strategy("testGroup", "192.168.24.1@default", queues, []string{"192.168.24.1@default", "192.168.24.2@default"})
		So(result, ShouldResemble, queues)
	})
}

func TestAllocateByMachineRoom(t *testing.T) {
	Convey("Given some consumer IDCs with a starting value", t, func() {
		idcs := []string{"192.168.24.1", "192.168.24.2"}
		strategy := AllocateByMachineRoom(idcs)

		queues := []*primitive.MessageQueue{
			{
				QueueId:    0,
				BrokerName: "192.168.24.1@defaultName",
			},
			{
				QueueId:    1,
				BrokerName: "192.168.24.1@defaultName",
			},
			{
				QueueId:    2,
				BrokerName: "192.168.24.1@defaultName",
			},
			{
				QueueId:    3,
				BrokerName: "192.168.24.2@defaultName",
			},
			{
				QueueId:    4,
				BrokerName: "192.168.24.2@defaultName",
			},
			{
				QueueId:    5,
				BrokerName: "192.168.24.3@defaultName",
			},
		}

		Convey("When params is empty", func() {
			result := strategy("testGroup", "", queues, []string{"192.168.24.1@default"})
			So(result, ShouldBeNil)

			result = strategy("testGroup", "192.168.24.1@default", nil, []string{"192.168.24.1@default"})
			So(result, ShouldBeNil)

			result = strategy("testGroup", "192.168.24.1@default", queues, nil)
			So(result, ShouldBeNil)
		})

		type testCase struct {
			currentCid    string
			mqAll         []*primitive.MessageQueue
			cidAll        []string
			expectedQueue []*primitive.MessageQueue
		}
		cases := []testCase{
			{
				currentCid: "192.168.24.1@default",
				mqAll:      queues,
				cidAll:     []string{"192.168.24.1@default", "192.168.24.2@default"},
				expectedQueue: []*primitive.MessageQueue{
					{
						QueueId:    0,
						BrokerName: "192.168.24.1@defaultName",
					},
					{
						QueueId:    1,
						BrokerName: "192.168.24.1@defaultName",
					},
					{
						QueueId:    4,
						BrokerName: "192.168.24.2@defaultName",
					},
				},
			},
			{
				currentCid: "192.168.24.2@default",
				mqAll:      queues,
				cidAll:     []string{"192.168.24.1@default", "192.168.24.2@default", "192.168.24.3@default"},
				expectedQueue: []*primitive.MessageQueue{
					{
						QueueId:    1,
						BrokerName: "192.168.24.1@defaultName",
					},
					{
						QueueId:    4,
						BrokerName: "192.168.24.2@defaultName",
					},
				},
			},
			{
				currentCid: "192.168.24.2@default",
				mqAll:      queues,
				cidAll:     []string{"192.168.24.1@default", "192.168.24.2@default", "192.168.24.3@default", "192.168.24.4@default"},
				expectedQueue: []*primitive.MessageQueue{
					{
						QueueId:    1,
						BrokerName: "192.168.24.1@defaultName",
					},
				},
			},
			{
				currentCid: "192.168.24.4@default",
				mqAll:      queues,
				cidAll:     []string{"192.168.24.1@default", "192.168.24.2@default", "192.168.24.3@default", "192.168.24.4@default"},
				expectedQueue: []*primitive.MessageQueue{
					{
						QueueId:    3,
						BrokerName: "192.168.24.2@defaultName",
					},
				},
			},
			{
				currentCid:    "192.168.24.7@default",
				mqAll:         queues,
				cidAll:        []string{"192.168.24.1@default", "192.168.24.2@default", "192.168.24.3@default", "192.168.24.4@default", "192.168.24.5@default", "192.168.24.6@default", "192.168.24.7@default"},
				expectedQueue: []*primitive.MessageQueue{},
			},
		}

		Convey("the result of AllocateByMachineRoom should be deep equal expectedQueue", func() {
			for _, value := range cases {
				result := strategy("testGroup", value.currentCid, value.mqAll, value.cidAll)
				So(result, ShouldResemble, value.expectedQueue)
			}
		})
	})
}

func TestAllocateByConsistentHash(t *testing.T) {
	Convey("Given virtualNodeCnt with a starting value", t, func() {
		virtualNodeCnt := 10
		strategy := AllocateByConsistentHash(virtualNodeCnt)

		queues := []*primitive.MessageQueue{
			{
				QueueId:    0,
				BrokerName: "192.168.24.1@defaultName",
			},
			{
				QueueId:    1,
				BrokerName: "192.168.24.1@defaultName",
			},
			{
				QueueId:    2,
				BrokerName: "192.168.24.1@defaultName",
			},
			{
				QueueId:    3,
				BrokerName: "192.168.24.2@defaultName",
			},
			{
				QueueId:    4,
				BrokerName: "192.168.24.2@defaultName",
			},
			{
				QueueId:    5,
				BrokerName: "192.168.24.3@defaultName",
			},
		}

		Convey("When params is empty", func() {
			result := strategy("testGroup", "", queues, []string{"192.168.24.1@default"})
			So(result, ShouldBeNil)

			result = strategy("testGroup", "192.168.24.1@default", nil, []string{"192.168.24.1@default"})
			So(result, ShouldBeNil)

			result = strategy("testGroup", "192.168.24.1@default", queues, nil)
			So(result, ShouldBeNil)
		})

		type testCase struct {
			currentCid string
			mqAll      []*primitive.MessageQueue
			cidAll     []string
		}
		cases := []testCase{
			{
				currentCid: "192.168.24.1@default",
				mqAll:      queues,
				cidAll:     []string{"192.168.24.1@default", "192.168.24.2@default", "192.168.24.3@default"},
			},
			{
				currentCid: "192.168.24.2@default",
				mqAll:      queues,
				cidAll:     []string{"192.168.24.1@default", "192.168.24.2@default", "192.168.24.3@default"},
			},
			{
				currentCid: "192.168.24.3@default",
				mqAll:      queues,
				cidAll:     []string{"192.168.24.1@default", "192.168.24.2@default", "192.168.24.3@default"},
			},
			{
				currentCid: "192.168.24.1@default",
				mqAll:      queues,
				cidAll:     []string{"192.168.24.1@default", "192.168.24.2@default"},
			},
			{
				currentCid: "192.168.24.2@default",
				mqAll:      queues,
				cidAll:     []string{"192.168.24.1@default", "192.168.24.2@default"},
			},
		}

		Convey("observe the result of AllocateByMachineRoom", func() {
			for _, value := range cases {
				result := strategy("testGroup", value.currentCid, value.mqAll, value.cidAll)
				fmt.Printf("\n\n currentCid:%s, cidAll:%s, \n allocateResult:%+v \n", value.currentCid, value.cidAll, result)
			}
		})
	})
}