/*
 *  Copyright (c) 2020 AT&T Intellectual Property.
 *  Copyright (c) 2020 Nokia.
 *
 *  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.
 *
 * This source code is part of the near-RT RIC (RAN Intelligent Controller)
 * platform project (RICP).
 */

package main

import (
	"encoding/json"
	"net/http"
	"time"

	"gerrit.o-ran-sc.org/r/ric-plt/alarm-go/alarm"
	app "gerrit.o-ran-sc.org/r/ric-plt/xapp-frame/pkg/xapp"
)

func (a *AlarmManager) respondWithJSON(w http.ResponseWriter, code int, payload interface{}) {
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(code)
	if payload != nil {
		response, _ := json.Marshal(payload)
		w.Write(response)
	}
}

func (a *AlarmManager) GetActiveAlarms(w http.ResponseWriter, r *http.Request) {
	app.Logger.Info("GetActiveAlarms: %+v", a.activeAlarms)
	a.respondWithJSON(w, http.StatusOK, a.activeAlarms)
}

func (a *AlarmManager) GetAlarmHistory(w http.ResponseWriter, r *http.Request) {
	app.Logger.Info("GetAlarmHistory: %+v", a.alarmHistory)
	a.respondWithJSON(w, http.StatusOK, a.alarmHistory)
}

func (a *AlarmManager) RaiseAlarm(w http.ResponseWriter, r *http.Request) {
	if err := a.doAction(w, r, true); err != nil {
		a.respondWithJSON(w, http.StatusOK, err)
	}
}

func (a *AlarmManager) ClearAlarm(w http.ResponseWriter, r *http.Request) {
	if err := a.doAction(w, r, false); err != nil {
		a.respondWithJSON(w, http.StatusOK, err)
	}
}

func (a *AlarmManager) doAction(w http.ResponseWriter, r *http.Request, isRaiseAlarm bool) error {
	app.Logger.Info("doAction: request received = %t", isRaiseAlarm)

	if r.Body == nil {
		app.Logger.Error("Error: Invalid message body!")
		return nil
	}
	defer r.Body.Close()

	var m alarm.AlarmMessage
	if err := json.NewDecoder(r.Body).Decode(&m); err != nil {
		app.Logger.Error("json.NewDecoder failed: %v", err)
		return err
	}

	if m.Alarm.ManagedObjectId == "" || m.Alarm.ApplicationId == "" || m.AlarmAction == "" {
		app.Logger.Error("Error: Mandatory parameters missing!")
		return nil
	}

	if m.AlarmTime == 0 {
		m.AlarmTime = time.Now().UnixNano()
	}

	_, err := a.ProcessAlarm(&m)
	return err
}

func (a *AlarmManager) HandleViaRmr(d alarm.Alarm, isRaiseAlarm bool) error {
	alarmClient, err := alarm.InitAlarm(d.ManagedObjectId, d.ApplicationId)
	if err != nil {
		app.Logger.Error("json.NewDecoder failed: %v", err)
		return err
	}

	alarmData := alarmClient.NewAlarm(d.SpecificProblem, d.PerceivedSeverity, d.AdditionalInfo, d.IdentifyingInfo)
	if isRaiseAlarm {
		alarmClient.Raise(alarmData)
	} else {
		alarmClient.Clear(alarmData)
	}

	return nil
}

func (a *AlarmManager) SetAlarmConfig(w http.ResponseWriter, r *http.Request) {
	var m alarm.AlarmConfigParams
	if err := json.NewDecoder(r.Body).Decode(&m); err != nil {
		app.Logger.Error("json.NewDecoder failed: %v", err)
	} else {
		a.maxActiveAlarms = m.MaxActiveAlarms
		a.maxAlarmHistory = m.MaxAlarmHistory
		app.Logger.Debug("new maxActiveAlarms = %v", a.maxActiveAlarms)
		app.Logger.Debug("new maxAlarmHistory = %v", a.maxAlarmHistory)
		a.respondWithJSON(w, http.StatusOK, err)
	}
}

func (a *AlarmManager) GetAlarmConfig(w http.ResponseWriter, r *http.Request) {
	var m alarm.AlarmConfigParams

	m.MaxActiveAlarms = a.maxActiveAlarms
	m.MaxAlarmHistory = a.maxAlarmHistory

	a.respondWithJSON(w, http.StatusOK, m)
	return
}