let ipc = null
let logMessages = new Set()

try {
    ipc = require('electron').ipcRenderer
} catch (e) {
    console.log("Cannot use electron logging.")
}

/** Basic class for app specific logging requirements.
 * Can be used to implement persistent logging in electron apps.
 * Uses a logMessage cache to prevent error overflows. This is 
 * needed since errors may occur very frequently
 * (e.g. display update loops at 60fps, programmatic loops, ...).
 */
export default class Logging {

    /** Static log function.
     * @param {*} message
     */
    static log(message) {

        if (ipc) {
            ipc.send('log', message)
        } else {
            console.log(message)
        }
    }

    /**
     * Static warn function. 
     * Emits each warning only once per session.
     * @param {*} message 
     */
    static warn(message) {
        if (!logMessages.has(message)) {
            logMessages.add(message)
            if (ipc) {
                ipc.send('warn', message)
            } else {
                console.warn(message)
            }
        }
    }

    /**
    * Static error function. 
    * Emits each error message only once per session.
    * @param {*} message 
    */
    static error(message) {
        if (!logMessages.has(message)) {
            logMessages.add(message)
            if (ipc) {
                ipc.send('error', message)
            } else {
                console.error(message)
            }
        }
    }
}