var request = require("request");
var tough = require('tough-cookie');
var Cookie = tough.Cookie;
var FileCookieStore = require("tough-cookie-store");
var fs = require("fs");
var cheerio = require("cheerio");
var mongojs = require("mongojs");
var db = mongojs("reddit");


function Reddit(user, pass) {
    var me = this;
    this.user = user;
    this.pass = pass;
    if (!this.user) this.user = "none";

    me.cookieFile = new FileCookieStore("./cookies/" + me.user + ".json", {encrypt: false});
    var jar = request.jar(me.cookieFile);
    me.jar = jar;
    this.request = request.defaults({
        jar : me.jar,
        headers: {
            "user-agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36"
        }
    });
}


Reddit.prototype.login = function(cb) {
    var me = this;
    this.request.post({
        url: "https://www.reddit.com/api/login/" + me.user,
        headers: {
            "x-requested-with": "XMLHttpRequest",
            "referer": "https://www.reddit.com/"
        },
        form: {
            op: "login-main",
            user: me.user,
            passwd: me.pass,
            rem: "on",
            api_type: "json"
        }
    }, function(err, res, body) {
        me.cookieFile.flush();
        cb();
    });
};

Reddit.prototype.getHome = function(cb) {
    var me = this;
    this.request("https://www.reddit.com/", function(err, res, body) {
        fs.writeFileSync("scratch.html", body);
    });
}

Reddit.prototype.getSubReddits = function(pages, cb) {
    var me = this;

    var subs = [];

    function getPage(link) {
        me.request(link, function(err, res, body) {
            var $ = cheerio.load(body);
            $("div.subreddit").each(function(i, el) {
                var sub = {
                    _id: $(el).find(".titlerow a").text().split(":")[0],
                    subscribed: null,
                    title: $(el).find(".titlerow a").text(),
                    url: $(el).find(".titlerow a").attr("href"),
                    text: $(el).find(".usertext-body").text().trim(),
                    subs: Number($(el).find(".score.unvoted .number").eq(0).text().replace(/,/g, ""))
                };
                if ($(el).find("a").eq(0).text() === "subscribe") {
                    sub.subscribed = false;
                } else {
                    sub.subscribed = true;
                }
                db.collection("subreddits").update({_id: sub._id}, {$set: sub}, {upsert: true});
                subs.push(sub);
            });

            pages--;
            if (pages === 0) {
                cb(subs);
            } else {
                var next = $(".next-button a").attr("href");
                getPage(next);
            }

        });
    }

    getPage("https://www.reddit.com/subreddits/");
};

Reddit.prototype.getSubReddit = function(id, cb) {
    var ret = new SubReddit(id);
    ret.request = this.request;
    return ret;
}

function SubReddit(id) {
    var me = this;
    me._id = id;
    me.url = "https://www.reddit.com/" + me._id;
    me.nextUrl = "";
    me.posts = [];
}

SubReddit.prototype.getTopYear = function(pages, cb) {
    var me = this;
    me.getPosts(me.url + "/top/?sort=top&t=year", pages, cb);
};

SubReddit.prototype.getPosts = function(url, pages, cb) {
    var me = this;
    me.request(url, function(err, res, body) {
        var $ = cheerio.load(body);
        $("div.thing.link").each(function(i, el) {
            var post = {
                _id: $(el).attr("data-fullname"),
                sub: me._id,
                title: $(el).find("a.title").text().trim(),
                link: $(el).find("a.title").attr("href"),
                score: Number($(el).find(".score.likes").text()),
                comments: Number($(el).find(".bylink.comments").text().split(" ")[0]),
                thumbnail: $(el).find("a.thumbnail img").attr("src"),
                posted: new Date($(el).find("time").attr("title"))
            };

            me.posts.push(post);

        });
        pages--;
        if (pages === 0) {
            cb();
        } else {
            var nextUrl = $(".next-button a").attr("href");
            me.getPosts(nextUrl, pages, cb);
        }
    });
};

function getPosts(req, url, cb) {
    var ret = {
        nextUrl: null,
        posts: []
    };
    req(url, function(err, res, body) {
        var $ = cheerio.load(body);

        $("div.thing.link").each(function(i, el) {
            var post = {
                title: $(el).find("a.title").text().trim(),
                link: $(el).find("a.title").attr("href"),
                score: Number($(el).find(".score.likes").text()),
                comments: Number($(el).find(".bylink.comments").text().split(" ")[0]),
                thumbnail: $(el).find("a.thumbnail img").attr("src"),
                posted: new Date($(el).find("time").attr("title"))
            };

            ret.posts.push(post);
        });
        ret.nextUrl = $(".next-button a").attr("href");
        cb(ret);
    });
}


module.exports = function(user, pass) {
    return new Reddit(user, pass);
};