// Copyright 2022 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.

package promutil

import (
	"net/http"

	frameModel "github.com/pingcap/tiflow/engine/framework/model"
	engineModel "github.com/pingcap/tiflow/engine/model"
	"github.com/pingcap/tiflow/engine/pkg/tenant"
	"github.com/prometheus/client_golang/prometheus"
	"github.com/prometheus/client_golang/prometheus/promhttp"
)

// [NOTICE]: SHOULD NOT use following functions. USE functions in 'util.go' INSTEAD.
// They are just for easy scenarios testing.

// HTTPHandlerForMetricImpl return http.Handler for prometheus metric
func HTTPHandlerForMetricImpl(gather prometheus.Gatherer) http.Handler {
	return promhttp.HandlerFor(
		gather,
		promhttp.HandlerOpts{},
	)
}

// NewFactory4MasterImpl return a Factory for jobmaster
func NewFactory4MasterImpl(reg *Registry, info tenant.ProjectInfo, prefix string, jobID engineModel.JobID) Factory {
	return NewAutoRegisterFactory(
		NewWrappingFactory(
			NewPromFactory(),
			prefix,
			prometheus.Labels{
				constLabelTenantKey:  info.TenantID(),
				constLabelProjectKey: info.ProjectID(),
				constLabelJobKey:     jobID,
			},
		),
		reg,
		jobID,
	)
}

// NewFactory4WorkerImpl return a Factory for worker
func NewFactory4WorkerImpl(reg *Registry, info tenant.ProjectInfo, prefix string, jobID engineModel.JobID,
	workerID frameModel.WorkerID,
) Factory {
	return NewAutoRegisterFactory(
		NewWrappingFactory(
			NewPromFactory(),
			prefix,
			prometheus.Labels{
				constLabelTenantKey:  info.TenantID(),
				constLabelProjectKey: info.ProjectID(),
				constLabelJobKey:     jobID,
				constLabelWorkerKey:  workerID,
			},
		),
		reg,
		workerID,
	)
}

// NewFactory4FrameworkImpl return a Factory for dataflow framework
func NewFactory4FrameworkImpl(reg *Registry) Factory {
	return NewAutoRegisterFactory(
		NewWrappingFactory(
			NewPromFactory(),
			frameworkMetricPrefix,
			prometheus.Labels{
				constLabelFrameworkKey: "true",
			},
		),
		reg,
		frameworkID,
	)
}

// NewFactory4TestImpl return a Factory for test
func NewFactory4TestImpl(reg *Registry, testID string) Factory {
	return NewAutoRegisterFactory(
		NewWrappingFactory(
			NewPromFactory(),
			frameworkMetricPrefix,
			prometheus.Labels{
				constLableTestKey: testID,
			},
		),
		reg,
		testID,
	)
}