const fs = require("fs");
const login = require("facebook-chat-api");
const fetch = require("node-fetch");
let stat = [];
let text = "";
// Simple echo bot. It will repeat everything that you say.
// Will stop when you say '/stop'
login({appState: JSON.parse(fs.readFileSync('appstate.json', 'utf8'))}, (err, api) => {
    if(err) return console.error(err);
    api.setOptions({listenEvents: true});
    function findThread(threadID)
    {
        for( let i = 0; i < stat.length; i++ ){
            if( threadID == stat[i][0]){
                console.log(threadID + "  " + stat[i][0]);
                return [true, i];
            }
        }
        return false;
    }
    function checkTime(epoch)
    {
        let ts = Math.round((new Date()).getTime() / 1000);
        console.log("epoch: " + epoch + " TS: " + ts + "dif: " + (ts - epoch));
        if( (ts - epoch) > 1800 ){
            return true;
        }else{
            return false;
        }
    }
    function sendResponse(threadID){
        api.sendMessage("Edwin is trying to sleep right now ~Robo Edwin",threadID);
    }
    var stopListening = api.listen((err, event) => {
        if(err) return console.error(err);
        api.markAsRead(event.threadID, (err) => {
            if(err) console.error(err);
        });
        switch(event.type) {
            case "message":
                let foundThread = findThread(event.threadID);

                if (foundThread[0] == true){
                    let epoch = stat[foundThread[1]][2];
                    if (checkTime(epoch)){
                        console.log("we can message.");
                        sendResponse(stat[foundThread[1]][0]);
                        stat[foundThread[1]][2] = Math.round((new Date()).getTime() / 1000);
                    }else
                    {
                        console.log("we should wait to message this person.");
                    }

                }else{
                    console.log("not Present");
                    let ts = Math.round((new Date()).getTime() / 1000);
                    stat.push([event.threadID,false, ts]);
                    console.log("we have not messaged this person.");
                    sendResponse(event.threadID);
                    stat[stat.length - 1][1] = true;
                }
                break;
            case "event":
                console.log(event);
                break;
        }
    });
});