// Licensed to the LF AI & Data foundation 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 proxy

import (
	"context"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"

	"github.com/milvus-io/milvus-proto/go-api/v2/milvuspb"
	"github.com/milvus-io/milvus/internal/util/sessionutil"
	"github.com/milvus-io/milvus/pkg/v2/util/funcutil"
	"github.com/milvus-io/milvus/pkg/v2/util/merr"
	"github.com/milvus-io/milvus/pkg/v2/util/metricsinfo"
	"github.com/milvus-io/milvus/pkg/v2/util/typeutil"
	"github.com/milvus-io/milvus/pkg/v2/util/uniquegenerator"
)

func TestProxy_metrics(t *testing.T) {
	var err error

	ctx := context.Background()
	req, _ := metricsinfo.ConstructRequestByMetricType(metricsinfo.SystemInfoMetrics)
	resp, err := getSystemInfoMetrics(ctx, req, getMockProxyRequestMetrics())
	assert.NoError(t, err)
	assert.NotNil(t, resp)
}

func createMockDDQueue() *ddTaskQueue {
	q := &ddTaskQueue{
		baseTaskQueue: newBaseTaskQueue(nil),
	}
	q.unissuedTasks.PushBack(&createCollectionTask{
		baseTask: baseTask{
			onEnqueueTime: time.Now(),
		},
	})
	q.unissuedTasks.PushBack(&createPartitionTask{
		baseTask: baseTask{
			onEnqueueTime: time.Now(),
		},
	})
	q.activeTasks[1] = &loadCollectionTask{
		baseTask: baseTask{
			onEnqueueTime: time.Now(),
		},
	}
	return q
}

func createMockDMQueue() *dmTaskQueue {
	q := &dmTaskQueue{
		baseTaskQueue: newBaseTaskQueue(nil),
	}
	q.unissuedTasks.PushBack(&insertTask{
		baseTask: baseTask{
			onEnqueueTime: time.Now(),
		},
	})
	q.unissuedTasks.PushBack(&upsertTask{
		baseTask: baseTask{
			onEnqueueTime: time.Now(),
		},
	})
	q.activeTasks[1] = &deleteTask{
		baseTask: baseTask{
			onEnqueueTime: time.Now(),
		},
	}
	return q
}

func createMockDQQueue() *dqTaskQueue {
	q := &dqTaskQueue{
		baseTaskQueue: newBaseTaskQueue(nil),
	}
	q.unissuedTasks.PushBack(&queryTask{
		baseTask: baseTask{
			onEnqueueTime: time.Now(),
		},
	})
	q.unissuedTasks.PushBack(&searchTask{
		baseTask: baseTask{
			onEnqueueTime: time.Now(),
		},
	})
	q.activeTasks[1] = &queryTask{
		baseTask: baseTask{
			onEnqueueTime: time.Now(),
		},
	}
	return q
}

func createMockDCQueue() *ddTaskQueue {
	q := &ddTaskQueue{
		baseTaskQueue: newBaseTaskQueue(nil),
	}
	q.unissuedTasks.PushBack(&flushTask{
		baseTask: baseTask{
			onEnqueueTime: time.Now(),
		},
	})
	q.unissuedTasks.PushBack(&flushTask{
		baseTask: baseTask{
			onEnqueueTime: time.Now(),
		},
	})
	q.activeTasks[1] = &flushTask{
		baseTask: baseTask{
			onEnqueueTime: time.Now(),
		},
	}
	return q
}

func getMockProxyRequestMetrics() *Proxy {
	mixc := NewMixCoordMock()
	defer mixc.Close()

	proxy := &Proxy{
		mixCoord: mixc,
		session:  &sessionutil.Session{SessionRaw: sessionutil.SessionRaw{Address: funcutil.GenRandomStr()}},
		sched: &taskScheduler{
			ddQueue: createMockDDQueue(),
			dmQueue: createMockDMQueue(),
			dqQueue: createMockDQQueue(),
			dcQueue: createMockDCQueue(),
		},
	}

	mixc.getMetricsFunc = func(ctx context.Context, request *milvuspb.GetMetricsRequest) (*milvuspb.GetMetricsResponse, error) {
		id := typeutil.UniqueID(uniquegenerator.GetUniqueIntGeneratorIns().GetInt())

		rootCoordTopology := metricsinfo.RootCoordTopology{
			Self: metricsinfo.RootCoordInfos{
				BaseComponentInfos: metricsinfo.BaseComponentInfos{
					Name:          metricsinfo.ConstructComponentName(typeutil.RootCoordRole, id),
					HardwareInfos: metricsinfo.HardwareMetrics{},
					SystemInfo:    metricsinfo.DeployMetrics{},
					Type:          typeutil.RootCoordRole,
					ID:            id,
				},
				SystemConfigurations: metricsinfo.RootCoordConfiguration{},
			},
			Connections: metricsinfo.ConnTopology{
				Name: metricsinfo.ConstructComponentName(typeutil.RootCoordRole, id),
				ConnectedComponents: []metricsinfo.ConnectionInfo{
					{
						TargetName: metricsinfo.ConstructComponentName(typeutil.QueryCoordRole, id),
						TargetType: typeutil.QueryCoordRole,
					},
					{
						TargetName: metricsinfo.ConstructComponentName(typeutil.DataCoordRole, id),
						TargetType: typeutil.DataCoordRole,
					},
				},
			},
		}

		clusterTopology := metricsinfo.DataClusterTopology{
			Self: metricsinfo.DataCoordInfos{
				BaseComponentInfos: metricsinfo.BaseComponentInfos{
					Name:          metricsinfo.ConstructComponentName(typeutil.DataCoordRole, id),
					HardwareInfos: metricsinfo.HardwareMetrics{},
					SystemInfo:    metricsinfo.DeployMetrics{},
					Type:          typeutil.DataCoordRole,
					ID:            id,
				},
				SystemConfigurations: metricsinfo.DataCoordConfiguration{},
			},
			ConnectedDataNodes: make([]metricsinfo.DataNodeInfos, 0),
		}

		infos := metricsinfo.DataNodeInfos{
			BaseComponentInfos:   metricsinfo.BaseComponentInfos{},
			SystemConfigurations: metricsinfo.DataNodeConfiguration{},
		}
		clusterTopology.ConnectedDataNodes = append(clusterTopology.ConnectedDataNodes, infos)

		indexNodeInfos := metricsinfo.DataNodeInfos{
			BaseComponentInfos:   metricsinfo.BaseComponentInfos{},
			SystemConfigurations: metricsinfo.DataNodeConfiguration{},
		}
		clusterTopology.ConnectedDataNodes = append(clusterTopology.ConnectedDataNodes, indexNodeInfos)

		coordTopology := metricsinfo.DataCoordTopology{
			Cluster: clusterTopology,
			Connections: metricsinfo.ConnTopology{
				Name: metricsinfo.ConstructComponentName(typeutil.DataCoordRole, id),
				ConnectedComponents: []metricsinfo.ConnectionInfo{
					{
						TargetName: metricsinfo.ConstructComponentName(typeutil.RootCoordRole, id),
						TargetType: typeutil.RootCoordRole,
					},
					{
						TargetName: metricsinfo.ConstructComponentName(typeutil.QueryCoordRole, id),
						TargetType: typeutil.QueryCoordRole,
					},
				},
			},
		}

		systemTopology := metricsinfo.SystemTopology{
			NodesInfo: []metricsinfo.SystemTopologyNode{
				{
					Identifier: int(id),
					Connected: []metricsinfo.ConnectionEdge{
						{
							ConnectedIdentifier: int(id),
							Type:                metricsinfo.CoordConnectToNode,
							TargetType:          typeutil.QueryCoordRole,
						},
						{
							ConnectedIdentifier: int(id),
							Type:                metricsinfo.CoordConnectToNode,
							TargetType:          typeutil.DataCoordRole,
						},
					},
					Infos: &rootCoordTopology.Self,
				},
				{
					Identifier: int(id),
					Connected: []metricsinfo.ConnectionEdge{
						{
							ConnectedIdentifier: int(id),
							Type:                metricsinfo.CoordConnectToNode,
							TargetType:          typeutil.RootCoordRole,
						},
						{
							ConnectedIdentifier: int(id),
							Type:                metricsinfo.CoordConnectToNode,
							TargetType:          typeutil.QueryCoordRole,
						},
					},
					Infos: &coordTopology.Cluster.Self,
				},
			},
		}

		resp, _ := metricsinfo.MarshalTopology(systemTopology)

		return &milvuspb.GetMetricsResponse{
			Status:        merr.Success(),
			Response:      resp,
			ComponentName: metricsinfo.ConstructComponentName(typeutil.MixCoordRole, id),
		}, nil
	}

	return proxy
}