package com.plannaplan.services;

import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ScheduledFuture;

import javax.annotation.PostConstruct;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
import org.springframework.scheduling.support.CronTrigger;
import org.springframework.stereotype.Service;

/**
 * Service to manage app events
 */
@Service
public class EventService {

    @Autowired
    private ExchangeService exchangeService;

    public static final int FIRST_TOUR_SCHEDULE = 0;
    public static final int SECOND_TOUR_SCHEDULE = 1;

    private ThreadPoolTaskScheduler scheduler;
    private Map<Integer, ScheduledFuture<?>> jobsMap = new HashMap<>();

    @Scheduled(cron = "0 24 17 * * *")
    public void collectGroupLosses() {
        System.out.println("Checking for groups");
    }

    /**
     * perfroms checks for matching exchanges daily
     */
    @Scheduled(cron = "0 0 0 * * *")
    public void performExchangeService() {
        System.out.println("Performing Exchange");
        this.exchangeService.performExchange();
    }

    /**
     * Schedule provided task to perform
     *
     * @param taskId      static filed of this class that represents to what event
     *                    we want to assign task
     * @param task        runnable class that perform task in implemented run method
     * @param cronTrigger CronTrigger instance with date to perform
     */
    public void scheduleTask(int taskId, Runnable task, CronTrigger cronTrigger) {
        ScheduledFuture<?> scheduledTask = jobsMap.get(taskId);
        if (scheduledTask != null) {
            scheduledTask.cancel(true);
            jobsMap.put(taskId, null);
        }
        scheduledTask = this.scheduler.schedule(task, cronTrigger);
        jobsMap.put(taskId, scheduledTask);
    }

    /**
     * init resources needed for dynamicly creating new tasks (needed to set tours
     * end events)
     */
    @PostConstruct
    public void initialize() {
        this.scheduler = new ThreadPoolTaskScheduler();
        this.scheduler.initialize();
    }
}