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/*
   Copyright 2017-2019 Jan Dittberner

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this program 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 main

import (
	log "github.com/sirupsen/logrus"
	"time"
)

type Job interface {
	Schedule()
	Stop()
	Run()
}

type jobIdentifier int

const (
	JobIdCloseDecisions jobIdentifier = iota
	JobIdRemindVotersJob
)

var rescheduleChannel = make(chan jobIdentifier, 1)

func JobScheduler(quitChannel chan int) {
	var jobs = map[jobIdentifier]Job{
		JobIdCloseDecisions:  NewCloseDecisionsJob(),
		JobIdRemindVotersJob: NewRemindVotersJob(),
	}
	log.Info("started job scheduler")

	for {
		select {
		case jobId := <-rescheduleChannel:
			job := jobs[jobId]
			log.Infof("reschedule job %s", job)
			job.Schedule()
		case <-quitChannel:
			for _, job := range jobs {
				job.Stop()
			}
			log.Info("stop job scheduler")
			return
		}
	}
}

type CloseDecisionsJob struct {
	timer *time.Timer
}

func NewCloseDecisionsJob() *CloseDecisionsJob {
	job := &CloseDecisionsJob{}
	job.Schedule()
	return job
}

func (j *CloseDecisionsJob) Schedule() {
	var nextDue *time.Time
	nextDue, err := GetNextPendingDecisionDue()
	if err != nil {
		log.Error("Could not get next pending due date")
		if j.timer != nil {
			j.timer.Stop()
			j.timer = nil
		}
		return
	}
	if nextDue == nil {
		log.Info("no next planned execution of CloseDecisionsJob")
		j.Stop()
	} else {
		nextDue := nextDue.Add(time.Second)
		log.Infof("scheduling CloseDecisionsJob for %s", nextDue)
		when := nextDue.Sub(time.Now())
		if j.timer != nil {
			j.timer.Reset(when)
		} else {
			j.timer = time.AfterFunc(when, j.Run)
		}
	}
}

func (j *CloseDecisionsJob) Stop() {
	if j.timer != nil {
		j.timer.Stop()
		j.timer = nil
	}
}

func (j *CloseDecisionsJob) Run() {
	log.Debug("running CloseDecisionsJob")
	err := CloseDecisions()
	if err != nil {
		log.Errorf("closing decisions %v", err)
	}
	rescheduleChannel <- JobIdCloseDecisions
}

func (j *CloseDecisionsJob) String() string {
	return "CloseDecisionsJob"
}

type RemindVotersJob struct {
	timer *time.Timer
}

func NewRemindVotersJob() *RemindVotersJob {
	job := &RemindVotersJob{}
	job.Schedule()
	return job
}

func (j *RemindVotersJob) Schedule() {
	year, month, day := time.Now().UTC().Date()
	nextExecution := time.Date(year, month, day, 0, 0, 0, 0, time.UTC).AddDate(0, 0, 3)
	log.Infof("scheduling RemindVotersJob for %s", nextExecution)
	when := nextExecution.Sub(time.Now())
	if j.timer != nil {
		j.timer.Reset(when)
	} else {
		j.timer = time.AfterFunc(when, j.Run)
	}
}

func (j *RemindVotersJob) Stop() {
	if j.timer != nil {
		j.timer.Stop()
		j.timer = nil
	}
}

func (j *RemindVotersJob) Run() {
	log.Info("running RemindVotersJob")
	defer func() { rescheduleChannel <- JobIdRemindVotersJob }()

	voters, err := GetReminderVoters()
	if err != nil {
		log.Errorf("problem getting voters %v", err)
		return
	}

	for _, voter := range *voters {
		decisions, err := FindUnvotedDecisionsForVoter(&voter)
		if err != nil {
			log.Errorf("problem getting unvoted decisions: %v", err)
			return
		}
		if len(*decisions) > 0 {
			NotifyMailChannel <- &RemindVoterNotification{voter: voter, decisions: *decisions}
		}
	}
}