// Logging
const log = Java.type('org.slf4j.LoggerFactory').getLogger('org.openhab.js.utils.TimerMgr');

class TimerMgr {

    #timers = new Object();

    constructor() {
        log.info('Initialization of TimerMgr helper class');
    }

    create(id, timeout, func) {
        if (this.hasTimer(id)) {
            log.error(`Timer with id ${id} already exists`);
            return;
        }
        log.debug("Create timer with id " + id);
        this.#timers[id] = actions.ScriptExecution.createTimer(id, timeout, func);
    }

    cancel(id) {
        // Return if no timer with the respactive id is available
        if (!this.hasTimer(id)) {
            log.warn(`No timer with id ${id} available to cancel`);
            return false;
        }

        // Check if timer is active
        if (!this.#timers[id].isActive()) {
            log.debug(`Timer with id ${id} not running. Cancel anyway`);
        } else {
            log.debug(`Cancel timer with identifier ${id}`);  
        }

        // Cancel timer
        this.#timers[id].cancel();
        delete this.#timers[id];
    }

    hasTimer(id) {
        return this.#timers.hasOwnProperty(id);
    }

    isActive(id) {
        if (!this.hasTimer(id)) {
            log.warn(`No timer with id ${id} found`);
            return false;
        }
        return this.#timers[id].isActive();
    }

    cancelAll() {
        // Fetch timers
        let timers = Object.keys(this.#timers);

        // Return if no timers available
        if (timers.length == 0) {
            log.debug('No timers available to cancel');
            return false;
        }
        
        // Cancel all timers
        for (let timer of timers) {
           this.cancel(timer);
        }
    }

    reschedule(id, timeout) {
        if (!this.hasTimer(id)) {
            log.warn(`Cannot reschedule non-existent timer with id ${id}`);
            return false;
        }
        this.#timers[id].reschedule(timeout);
    }
}

function getTimerMgr () {
    return new TimerMgr();
}

module.exports = {
    TimerMgr,
    getTimerMgr
};