var chat = document.getElementById("chat");
var input = document.getElementById("input");
var send = document.getElementById("sayit-button");
var subscribedStorage = "SIRPYTHON_PIMPBOT_SUBSCRIBED";
var pimpedStorage = "SIRPYTHON_PIMPBOT_PIMPED";

sessionStorage.setItem(pimpedStorage, "{}"); // so I don't get an undefined thing later

/**
    Returns the last chat message spoken
*/
function getLastMessage() {
    return {
        content: chat.lastElementChild.children[1].lastElementChild.children[1].innerHTML,
        user: chat.lastElementChild.children[0].children[2].innerHTML.replace(/ /g,'')
    };
}

// ---------- Chat functions ----------
/**
    Sends a message to chat
*/
function sendMessage(message) {
    input.value = message;
    send.click();
}
/**
    Sends a message @ a user
*/
function sendTo(message, user) {
    sendMessage("@" + user + " " + message);
}
// ---------- Subscribed list functions ----------
/**
    Returns an object representing the subscribed list from storage
*/
function getSubscribedList() {
    return JSON.parse(localStorage.getItem(subscribedStorage));
}
/**
    Sets an object representing the subscribed list to storage
*/
function setSubscribedList(newList) {
    localStorage.setItem(subscribedStorage, JSON.stringify(newList));
}
/**
    Adds a user to the subscribed list
*/
function addToSubscribed(username) {
    var subscribed = getSubscribedList();
    subscribed[username] = true;
    setSubscribedList(subscribed);
}
/**
    Removes a user from the subscribed list
*/
function removeFromSubscribed(username) {
    var subscribed = getSubscribedList();
    delete subscribed[username];
    setSubscribedList(subscribed);
}
/**
    Returns if a user is subscribed
*/
function isSubscribed(username) {
    return getSubscribedList()[username] != undefined;
}
/**
    Returns all the subscribed users
*/
function getSubscribedUsers() {
    var users = [];
    var subscribed = getSubscribedList();
    for(var user in subscribed) {
        users.push(user);
    }
    return users;
}
// ---------- Pimped list functions ----------
/**
    Returns an object representing the pimped list from storage
*/
function getPimpedList() {
    return JSON.parse(sessionStorage.getItem(pimpedStorage));
}
/**
    Sets an object representing the pimped list to storage
*/
function setPimpedList(newList) {
    sessionStorage.setItem(pimpedStorage, JSON.stringify(newList));
}
/**
    Adds an ID to the pimped list
*/
function addToPimped(id) {
    var pimped = getPimpedList()
    pimped[id] = true;
    setPimpedList(pimped);
}
/**
    Returns if an ID has been pimped
*/
function wasPimped(id) {
    return getPimpedList()[id] != undefined;
}

function main() {
    var message = getLastMessage();
    var messageParts = message.content.split(" ");

    if(message.user != "SirAlfred") {
        if(message.content == "subscribe") {
            if(isSubscribed(message.user) == false) {
                addToSubscribed(message.user);
                sendTo("You have been successfully subscribed.", message.user);
            } else {
                sendTo("You are already subscribed.", message.user);
            }
        } else if(message.content == "unsubscribe") {
            if(isSubscribed(message.user) == true) {
                removeFromSubscribed(message.user);
                sendTo("You have been successfully removed.", message.user);
            } else {
                sendTo("You are not subscribed.", message.user);
            }
        } else if(messageParts[0] == "pimp") {
            if(isSubscribed(message.user) == true) {
                var id = messageParts[1];
                if(id == undefined) {
                    sendTo("You need to provide the ID of your answer.", message.user);
                }

                if(wasPimped(id) == false) {
                    addToPimped(id);
                    var groupMessage = "";
                    var subscribed = getSubscribedUsers();
                    for(var i = 0; i < subscribed.length; i++) {
                        groupMessage += ("@" + subscribed[i] + " ");
                    }
                    sendMessage(groupMessage);
                    window.setTimeout(function() {
                        sendMessage("http://codereview.stackexchange.com/a/" + id);
                    }, 4000);
                } else {
                    sendTo("That post has already been pimped today.", message.user);
                }
            } else {
                sendTo("You must be subscribed to pimp here.", message.user);
            }
        }
    }

    window.setTimeout(main, 5000);
}