// Copyright 2013 Prometheus Team
// 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 web

import (
	"github.com/prometheus/prometheus/retrieval"
	"github.com/prometheus/prometheus/rules"
	"github.com/prometheus/prometheus/storage/metric"
	"net/http"
	"sync"
	"time"
)

type PrometheusStatus struct {
	BuildInfo   map[string]string
	Config      string
	Curation    metric.CurationState
	Flags       map[string]string
	Rules       []rules.Rule
	TargetPools map[string]*retrieval.TargetPool

	Birth time.Time
}

type StatusHandler struct {
	CurationState    chan metric.CurationState
	PrometheusStatus *PrometheusStatus

	mutex sync.RWMutex
}

func (h *StatusHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	select {
	case curationState := <-h.CurationState:
		h.mutex.Lock()
		defer h.mutex.Unlock()
		h.PrometheusStatus.Curation = curationState
	default:
		h.mutex.RLock()
		defer h.mutex.RUnlock()
	}

	executeTemplate(w, "status", h.PrometheusStatus)
}