// Copyright 2015 Google Inc. All Rights Reserved.
//
// 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 collector

import (
	"encoding/json"
	"io/ioutil"
	"time"

	"github.com/google/cadvisor/info/v1"
)

type GenericCollector struct {
	//name of the collector
	name string

	//holds information extracted from the config file for a collector
	configFile Config
}

//Returns a new collector using the information extracted from the configfile
func NewCollector(collectorName string, configfile string) (*GenericCollector, error) {
	configFile, err := ioutil.ReadFile(configfile)
	if err != nil {
		return nil, err
	}

	var configInJSON Config
	err = json.Unmarshal(configFile, &configInJSON)
	if err != nil {
		return nil, err
	}

	//TODO : Add checks for validity of config file (eg : Accurate JSON fields)

	return &GenericCollector{
		name: collectorName, configFile: configInJSON,
	}, nil
}

//Returns name of the collector
func (collector *GenericCollector) Name() string {
	return collector.name
}

//Returns collected metrics and the next collection time of the collector
func (collector *GenericCollector) Collect() (time.Time, []v1.Metric, error) {
	//TO BE IMPLEMENTED
	return time.Now(), nil, nil
}