/*
 * Copyright (C) 2017-2019 "IoT.bzh"
 * Author Sebastien Douheret <sebastien@iot.bzh>
 *
 * 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 agent

import (
	"net/http"

	"gerrit.automotivelinux.org/gerrit/src/xds/xds-agent.git/lib/aglafb"
	common "gerrit.automotivelinux.org/gerrit/src/xds/xds-common.git"
	"github.com/gin-gonic/gin"
)

//************************* AGL XDS Monitoring *************************

// getMonitoringTopo : return current AGL daemons topology using monitoring
func (s *APIService) getMonitoringTopo(c *gin.Context) {

	xdspvr, err := s._initXdsMonitoring()
	if err != nil {
		common.APIError(c, err.Error())
		return
	}

	var res aglafb.AfbReply
	if err = xdspvr.GetTopo(&res); err != nil {
		common.APIError(c, err.Error())
		return
	}

	if res.Request.Status != "success" {
		common.APIError(c, res.Request.Info)
		return
	}

	c.JSON(http.StatusOK, res.Response)
}

// startMonitoring : resquest to monitoring to start tracing
func (s *APIService) startMonitoring(c *gin.Context) {

	xdspvr, err := s._initXdsMonitoring()
	if err != nil {
		common.APIError(c, err.Error())
		return
	}

	var cfg XdsSuperVTraceConfig
	if c.BindJSON(&cfg) != nil {
		common.APIError(c, "Invalid config argument")
		return
	}
	s.Log.Debugf("Start Monitoring cfgArg %v", cfg)

	res := aglafb.NewAfbReply()
	if err = xdspvr.StartTrace(cfg, res); err != nil {
		common.APIError(c, err.Error())
		return
	}

	if !res.Success() {
		common.APIError(c, res.GetInfo())
		return
	}

	c.JSON(http.StatusOK, res.Response)
}

// stopMonitoring : resquest to monitoring to stop tracing
func (s *APIService) stopMonitoring(c *gin.Context) {

	xdspvr, err := s._initXdsMonitoring()
	if err != nil {
		common.APIError(c, err.Error())
		return
	}

	var res aglafb.AfbReply
	if err = xdspvr.StopTrace(&res); err != nil {
		common.APIError(c, err.Error())
		return
	}

	if res.Request.Status != "success" {
		common.APIError(c, res.Request.Info)
		return
	}

	c.JSON(http.StatusOK, res.Response)
}

// _initXdsMonitoring .
func (s *APIService) _initXdsMonitoring() (*XdsMonitoring, error) {

	if s.XdsMonitoring == nil {
		xs := NewXdsMonitoring(s.Context)
		if err := xs.Connect(); err != nil {
			return nil, err
		}
		s.XdsMonitoring = xs
	}
	return s.XdsMonitoring, nil
}

//*************************  AGL Low Collector *************************

// XdsLowCollectorConfig Configuration structure for ALC
type XdsLowCollectorConfig struct {
	Time int `json:"time"`
}

// StartLowCollector : resquest to Start low collector
func (s *APIService) StartLowCollector(c *gin.Context) {

	alc, err := s._initXdsLowCollector()
	if err != nil {
		common.APIError(c, err.Error())
		return
	}

	s.Log.Debugf("Init & config AGL Low Collector")

	if err = alc.Init(); err != nil {
		common.APIError(c, err.Error())
		return
	}

	// // Config is optional, if not set used define settings
	var cfg XdsLowCollectorConfig
	c.ShouldBindJSON(&cfg)

	s.Log.Debugf("Start Low Collector cfgArg %v", cfg)

	if err = alc.Start(cfg.Time); err != nil {
		common.APIError(c, err.Error())
		return
	}

	c.JSON(http.StatusOK, "done")
}

// StopLowCollector : resquest to Stop low collector
func (s *APIService) StopLowCollector(c *gin.Context) {

	alc, err := s._initXdsLowCollector()
	if err != nil {
		common.APIError(c, err.Error())
		return
	}

	s.Log.Debugf("Stop AGL Low Collector")

	if err = alc.Stop(); err != nil {
		common.APIError(c, err.Error())
	}

	// SEB TODO
	res := "done"
	c.JSON(http.StatusOK, res)
}

// ReadLowCollector : read one data
func (s *APIService) ReadLowCollector(c *gin.Context) {

	alc, err := s._initXdsLowCollector()
	if err != nil {
		common.APIError(c, err.Error())
		return
	}
	plugin := "cpu"
	s.Log.Debugf("Read data of %s plugin AGL Low Collector", plugin)

	var data interface{}
	if err = alc.Read(&data); err != nil {
		common.APIError(c, err.Error())
	}

	// SEB TODO
	res := "done"
	c.JSON(http.StatusOK, res)
}

// ResetLowCollector : Reset Low Collector
func (s *APIService) ResetLowCollector(c *gin.Context) {
	// SEB TODO
	common.APIError(c, "Not implemented yet")
}

// _initXdsLowCollector .
func (s *APIService) _initXdsLowCollector() (*XdsLowCollector, error) {

	if s.XdsLowCollector == nil {
		alc := NewXdsLowCollector(s.Context)
		if err := alc.Connect(); err != nil {
			return nil, err
		}
		s.XdsLowCollector = alc
	}
	return s.XdsLowCollector, nil
}