package kafka

import (
	"fmt"
	"github.com/SigNoz/signoz/pkg/query-service/common"
	"github.com/SigNoz/signoz/pkg/query-service/constants"
	v3 "github.com/SigNoz/signoz/pkg/query-service/model/v3"
)

var defaultStepInterval int64 = 60

func BuildQueryRangeParams(messagingQueue *MessagingQueue, queryContext string) (*v3.QueryRangeParamsV3, error) {

	if constants.KafkaSpanEval == "false" && queryContext == "producer-consumer-eval" {
		return nil, fmt.Errorf("span evaluation feature is disabled and is experimental")
	}

	// ToDo: propagate this through APIs when there are different handlers
	queueType := KafkaQueue

	chq, err := BuildClickHouseQuery(messagingQueue, queueType, queryContext)

	if err != nil {
		return nil, err
	}

	cq, err := buildCompositeQuery(chq, queryContext)
	if err != nil {
		return nil, err
	}

	queryRangeParams := &v3.QueryRangeParamsV3{
		Start:          messagingQueue.Start,
		End:            messagingQueue.End,
		Step:           defaultStepInterval,
		CompositeQuery: cq,
		Version:        "v4",
		FormatForWeb:   true,
	}

	return queryRangeParams, nil
}

func buildClickHouseQueryNetwork(messagingQueue *MessagingQueue, queueType string) (*v3.ClickHouseQuery, error) {
	start := messagingQueue.Start
	end := messagingQueue.End

	consumerGroup, ok := messagingQueue.Variables["consumer_group"]
	if !ok {
		return nil, fmt.Errorf("consumer_group not found in the request")
	}

	partitionID, ok := messagingQueue.Variables["partition"]
	if !ok {
		return nil, fmt.Errorf("partition not found in the request")
	}

	query := generateNetworkLatencyThroughputSQL(start, end, consumerGroup, partitionID, queueType)
	return &v3.ClickHouseQuery{
		Query: query,
	}, nil
}

func buildBuilderQueriesProducerBytes(
	unixMilliStart, unixMilliEnd int64,
	attributeCache *Clients,
) (map[string]*v3.BuilderQuery, error) {

	normalized := true
	if constants.IsDotMetricsEnabled {
		normalized = false
	}

	bq := make(map[string]*v3.BuilderQuery)
	queryName := "byte_rate"

	chq := &v3.BuilderQuery{
		QueryName:    queryName,
		StepInterval: common.MinAllowedStepInterval(unixMilliStart, unixMilliEnd),
		DataSource:   v3.DataSourceMetrics,
		AggregateAttribute: v3.AttributeKey{
			Key:      getDotMetrics("kafka_producer_byte_rate", normalized),
			DataType: v3.AttributeKeyDataTypeFloat64,
			Type:     v3.AttributeKeyType("Gauge"),
			IsColumn: true,
		},
		AggregateOperator: v3.AggregateOperatorAvg,
		Temporality:       v3.Unspecified,
		TimeAggregation:   v3.TimeAggregationAvg,
		SpaceAggregation:  v3.SpaceAggregationAvg,
		Filters: &v3.FilterSet{
			Operator: "AND",
			Items: []v3.FilterItem{
				{
					Key: v3.AttributeKey{
						Key:      getDotMetrics("service_name", normalized),
						Type:     v3.AttributeKeyTypeTag,
						DataType: v3.AttributeKeyDataTypeString,
					},
					Operator: v3.FilterOperatorIn,
					Value:    attributeCache.ServiceName,
				},
				{
					Key: v3.AttributeKey{
						Key:      "topic",
						Type:     v3.AttributeKeyTypeTag,
						DataType: v3.AttributeKeyDataTypeString,
					},
					Operator: v3.FilterOperatorIn,
					Value:    attributeCache.TopicName,
				},
			},
		},
		Expression: queryName,
		ReduceTo:   v3.ReduceToOperatorAvg,
		GroupBy: []v3.AttributeKey{
			{
				Key:      getDotMetrics("service_name", normalized),
				DataType: v3.AttributeKeyDataTypeString,
				Type:     v3.AttributeKeyTypeTag,
			},
			{
				Key:      "topic",
				DataType: v3.AttributeKeyDataTypeString,
				Type:     v3.AttributeKeyTypeTag,
			},
		},
	}
	bq[queryName] = chq
	return bq, nil
}

func buildBuilderQueriesNetwork(
	unixMilliStart, unixMilliEnd int64,
	attributeCache *Clients,
) (map[string]*v3.BuilderQuery, error) {

	bq := make(map[string]*v3.BuilderQuery)
	queryName := "latency"

	normalized := true
	if constants.IsDotMetricsEnabled {
		normalized = false
	}

	chq := &v3.BuilderQuery{
		QueryName:    queryName,
		StepInterval: common.MinAllowedStepInterval(unixMilliStart, unixMilliEnd),
		DataSource:   v3.DataSourceMetrics,
		AggregateAttribute: v3.AttributeKey{
			Key: getDotMetrics("kafka_consumer_fetch_latency_avg", normalized),
		},
		AggregateOperator: v3.AggregateOperatorAvg,
		Temporality:       v3.Unspecified,
		TimeAggregation:   v3.TimeAggregationAvg,
		SpaceAggregation:  v3.SpaceAggregationAvg,
		Filters: &v3.FilterSet{
			Operator: "AND",
			Items: []v3.FilterItem{
				{
					Key: v3.AttributeKey{
						Key:      getDotMetrics("service_name", normalized),
						Type:     v3.AttributeKeyTypeTag,
						DataType: v3.AttributeKeyDataTypeString,
					},
					Operator: v3.FilterOperatorIn,
					Value:    attributeCache.ServiceName,
				},
				{
					Key: v3.AttributeKey{
						Key:      getDotMetrics("client_id", normalized),
						Type:     v3.AttributeKeyTypeTag,
						DataType: v3.AttributeKeyDataTypeString,
					},
					Operator: v3.FilterOperatorIn,
					Value:    attributeCache.ClientID,
				},
				{
					Key: v3.AttributeKey{
						Key:      getDotMetrics("service_instance_id", normalized),
						Type:     v3.AttributeKeyTypeTag,
						DataType: v3.AttributeKeyDataTypeString,
					},
					Operator: v3.FilterOperatorIn,
					Value:    attributeCache.ServiceInstanceID,
				},
			},
		},
		Expression: queryName,
		ReduceTo:   v3.ReduceToOperatorAvg,
		GroupBy: []v3.AttributeKey{
			{
				Key:      getDotMetrics("service_name", normalized),
				DataType: v3.AttributeKeyDataTypeString,
				Type:     v3.AttributeKeyTypeTag,
			},
			{
				Key:      getDotMetrics("client_id", normalized),
				DataType: v3.AttributeKeyDataTypeString,
				Type:     v3.AttributeKeyTypeTag,
			},
			{
				Key:      getDotMetrics("service_instance_id", normalized),
				DataType: v3.AttributeKeyDataTypeString,
				Type:     v3.AttributeKeyTypeTag,
			},
		},
	}
	bq[queryName] = chq
	return bq, nil
}

func BuildBuilderQueriesKafkaOnboarding(messagingQueue *MessagingQueue) (*v3.QueryRangeParamsV3, error) {

	bq := make(map[string]*v3.BuilderQuery)

	unixMilliStart := messagingQueue.Start / 1000000
	unixMilliEnd := messagingQueue.End / 1000000

	normalized := true
	if constants.IsDotMetricsEnabled {
		normalized = false
	}

	buiderQuery := &v3.BuilderQuery{
		QueryName:    "fetch_latency",
		StepInterval: common.MinAllowedStepInterval(unixMilliStart, unixMilliEnd),
		DataSource:   v3.DataSourceMetrics,
		AggregateAttribute: v3.AttributeKey{
			Key: getDotMetrics("kafka_consumer_fetch_latency_avg", normalized),
		},
		AggregateOperator: v3.AggregateOperatorCount,
		Temporality:       v3.Unspecified,
		TimeAggregation:   v3.TimeAggregationCount,
		SpaceAggregation:  v3.SpaceAggregationSum,
		Expression:        "fetch_latency",
	}
	bq["fetch_latency"] = buiderQuery

	buiderQuery = &v3.BuilderQuery{
		QueryName:    "consumer_lag",
		StepInterval: common.MinAllowedStepInterval(unixMilliStart, unixMilliEnd),
		DataSource:   v3.DataSourceMetrics,
		AggregateAttribute: v3.AttributeKey{
			Key: getDotMetrics("kafka_consumer_group_lag", normalized),
		},
		AggregateOperator: v3.AggregateOperatorCount,
		Temporality:       v3.Unspecified,
		TimeAggregation:   v3.TimeAggregationCount,
		SpaceAggregation:  v3.SpaceAggregationSum,
		Expression:        "consumer_lag",
	}
	bq["consumer_lag"] = buiderQuery

	cq := &v3.CompositeQuery{
		QueryType:      v3.QueryTypeBuilder,
		BuilderQueries: bq,
		PanelType:      v3.PanelTypeTable,
	}

	queryRangeParams := &v3.QueryRangeParamsV3{
		Start:          unixMilliStart,
		End:            unixMilliEnd,
		Step:           defaultStepInterval,
		CompositeQuery: cq,
		Version:        "v4",
		FormatForWeb:   true,
	}

	return queryRangeParams, nil
}

func BuildQRParamsWithCache(
	messagingQueue *MessagingQueue,
	queryContext string,
	attributeCache *Clients,
) (*v3.QueryRangeParamsV3, error) {

	queueType := KafkaQueue

	unixMilliStart := messagingQueue.Start / 1000000
	unixMilliEnd := messagingQueue.End / 1000000

	var cq *v3.CompositeQuery
	var err error

	if queryContext == "throughput" {
		chq, err := buildClickHouseQueryNetwork(messagingQueue, queueType)
		if err != nil {
			return nil, err
		}
		cq, err = buildCompositeQuery(chq, queryContext)

	} else if queryContext == "fetch-latency" {
		bhq, err := buildBuilderQueriesNetwork(unixMilliStart, unixMilliEnd, attributeCache)
		if err != nil {
			return nil, err
		}
		cq = &v3.CompositeQuery{
			QueryType:      v3.QueryTypeBuilder,
			BuilderQueries: bhq,
			PanelType:      v3.PanelTypeTable,
		}

	} else if queryContext == "producer-throughput-overview" {
		start := messagingQueue.Start
		end := messagingQueue.End
		query := generateProducerPartitionThroughputSQL(start, end, queueType)
		cq, err = buildCompositeQuery(&v3.ClickHouseQuery{
			Query: query,
		}, queryContext)

	} else if queryContext == "producer-throughput-overview-byte-rate" {
		bhq, err := buildBuilderQueriesProducerBytes(unixMilliStart, unixMilliEnd, attributeCache)
		if err != nil {
			return nil, err
		}
		cq = &v3.CompositeQuery{
			QueryType:      v3.QueryTypeBuilder,
			BuilderQueries: bhq,
			PanelType:      v3.PanelTypeTable,
			FillGaps:       false,
		}
	}

	queryRangeParams := &v3.QueryRangeParamsV3{
		Start:          unixMilliStart,
		End:            unixMilliEnd,
		Step:           defaultStepInterval,
		CompositeQuery: cq,
		Version:        "v4",
		FormatForWeb:   true,
	}

	return queryRangeParams, err
}

func BuildClickHouseQuery(
	messagingQueue *MessagingQueue,
	queueType string,
	queryContext string,
) (*v3.ClickHouseQuery, error) {

	start := messagingQueue.Start
	end := messagingQueue.End

	var topic, partition string

	if queryContext == "producer" ||
		queryContext == "consumer" ||
		queryContext == "consumer_partition_latency" ||
		queryContext == "producer-throughput-details" ||
		queryContext == "consumer-throughput-details" {

		var ok bool
		topic, ok = messagingQueue.Variables["topic"]
		if !ok {
			return nil, fmt.Errorf("invalid type for Topic")
		}

		if !(queryContext == "consumer-throughput-details" ||
			queryContext == "producer-throughput-details") {

			partition, ok = messagingQueue.Variables["partition"]
			if !ok {
				return nil, fmt.Errorf("invalid type for Partition")
			}
		}
	}

	var query string

	switch queryContext {
	case "producer":
		query = generateProducerSQL(start, end, topic, partition, queueType)
	case "consumer":
		consumerGroup, ok := messagingQueue.Variables["consumer_group"]
		if !ok {
			return nil, fmt.Errorf("invalid type for consumer group")
		}
		query = generateConsumerSQL(start, end, topic, partition, consumerGroup, queueType)
	case "producer-topic-throughput":
		query = generatePartitionLatencySQL(start, end, queueType)
	case "consumer_partition_latency":
		query = generateConsumerPartitionLatencySQL(start, end, topic, partition, queueType)
	case "producer-throughput-details":
		svcName, ok := messagingQueue.Variables["service_name"]
		if !ok {
			return nil, fmt.Errorf("invalid type for service")
		}
		query = generateProducerTopicLatencySQL(start, end, topic, svcName, queueType)
	case "consumer-throughput-overview":
		query = generateConsumerLatencySQL(start, end, queueType)
	case "consumer-throughput-details":
		svcName, ok := messagingQueue.Variables["service_name"]
		if !ok {
			return nil, fmt.Errorf("invalid type for service")
		}
		query = generateConsumerServiceLatencySQL(start, end, topic, svcName, queueType)
	case "producer-consumer-eval":
		query = generateProducerConsumerEvalSQL(start, end, queueType, messagingQueue.EvalTime)
	case "onboard_producers":
		query = onboardProducersSQL(start, end, queueType)
	case "onboard_consumers":
		query = onboardConsumerSQL(start, end, queueType)
	}

	return &v3.ClickHouseQuery{
		Query: query,
	}, nil
}

func buildCompositeQuery(chq *v3.ClickHouseQuery, queryContext string) (*v3.CompositeQuery, error) {

	if queryContext == "producer-consumer-eval" {
		return &v3.CompositeQuery{
			QueryType:         v3.QueryTypeClickHouseSQL,
			ClickHouseQueries: map[string]*v3.ClickHouseQuery{queryContext: chq},
			PanelType:         v3.PanelTypeList,
		}, nil
	}

	return &v3.CompositeQuery{
		QueryType:         v3.QueryTypeClickHouseSQL,
		ClickHouseQueries: map[string]*v3.ClickHouseQuery{queryContext: chq},
		PanelType:         v3.PanelTypeTable,
	}, nil
}

func getDotMetrics(metricName string, normalized bool) string {
	dotMetricsMap := map[string]string{
		"kafka_producer_byte_rate":         "kafka.producer.byte-rate",
		"service_name":                     "service.name",
		"kafka_consumer_fetch_latency_avg": "kafka.consumer.fetch_latency_avg",
		"service_instance_id":              "service.instance.id",
		"client_id":                        "client-id",
		"kafka_consumer_group_lag":         "kafka.consumer_group.lag",
	}
	if _, ok := dotMetricsMap[metricName]; ok && !normalized {
		return dotMetricsMap[metricName]
	} else {
		return metricName
	}
}