const Discord = require("discord.js");
const TOKEN = require("./token.js");
const lowdb = require("lowdb");
const FileSync = require("lowdb/adapters/FileSync");

const adapter = new FileSync(__dirname + "/db.json");
const db = lowdb(adapter);

db._.mixin({
    randomElement: array => array[Math.floor(Math.random() * array.length)]
});

db.defaults({
    emotes: {
        angery: [
            "488797492352385034",
            "488797455899688971",
            "488796668750200842",
            "488796396175097876",
            "488793566982963231",
            "488793511181811749",
            "488791172085448718",
            "489091926474096651"
        ],
        hug: [
            "489094486132260864",
            "489094428410249218",
            "489094553148850176",
            "489094604935790622",
            "485109695846023209"
        ]
    },
    specialUsers: [
        "141880968800763905",
        "307897683849510912",
        "335898304472678402"
    ],
    reactableMentionedUsers: ["307897683849510912", "335898304472678402"],
    guides: [],
    editors: {
        roles: ["484046157971193866", "305844721622712322"],
        users: [
            "307897683849510912",
            "170116346095468545",
            "335898304472678402"
        ]
    }
}).write();

const client = new Discord.Client();

function isAuthorised(member) {
    if (
        db
            .get("editors.users")
            .includes(member.id)
            .value()
    )
        return true;
    if (
        db
            .get("editors.roles")
            .intersectionWith(member.roles.keyArray())
            .isEmpty()
            .value()
    )
        return false;
    return true;
}

const commands = {
    "make guide": msg => {
        if (!isAuthorised(msg.member)) return;
        let content = msg.content.substring(msg.content.indexOf("make guide") + "make guide ".length);
        let guideName = content.substring(0, content.indexOf("\n")).trim();
        let guideContent = content.substring(content.indexOf("\n")).trim();

        let guide = db.get("guides").find({ name: guideName });

        if (!guide.isUndefined().value()) {
            guide.assign({ content: guideContent }).write();
        } else {
            db.get("guides")
                .push({
                    name: guideName,
                    content: guideContent
                })
                .write();
        }

        msg.channel.send(
            `${msg.author.toString()} Added/updated "${guideName}"!`
        );
    },
    "delete guide": (msg, s) => {
        if (!isAuthorised(msg.member)) return;
        let guideName = s.substring("delete guide ".length).trim();
        let val = db.get("guides").find({ name: guideName });

        if (val.isUndefined().value()) {
            msg.channel.send(`${msg.author.toString()} No guide "${guideName}"!`);
            return;
        }

        db.get("guides")
            .remove({ name: guideName })
            .write();
        msg.channel.send(
            `${msg.author.toString()} Removed guide "${guideName}!"`
        );
    },
    help: msg => {
        let guides = db
            .get("guides")
            .map(g => g.name)
            .reduce((p, c) => `${p}\n${c}`, "")
            .value();
        msg.channel.send(
            `Hello! I am NoctBot! I have answers for the most common C(O)M-related questions.\nJust ping me with one of the following keywords:\n\`\`\`${guides}\`\`\``
        );
    }
};

client.on("ready", () => {
    console.log("Ready!");
    client.user.setActivity("@NoctBot help", { type: "PLAYING" });
});

client.on("message", m => {
    if (m.author.id == client.user.id || m.mentions.users.size == 0) return;

    if (!db.get("reactableMentionedUsers").intersectionWith(m.mentions.users.map(u => u.id)).isEmpty().value()) {
        const emoteId = db
            .get("emotes")
            .get("angery")
            .randomElement()
            .value();
        m.react(client.emojis.find(e => e.id == emoteId));
        return;
    }

    if (m.mentions.users.first().id == client.user.id) {
        let content = m.cleanContent
            .substring(`@${client.user.username} `.length);
        let lowerCaseContent = content.toLowerCase().trim();
        for (let c in commands) {
            if (lowerCaseContent.startsWith(c)) {
                commands[c](m, content);
                return;
            }
        }

        if (lowerCaseContent.length > 0) {
            let parts = lowerCaseContent.trim().split(" ");
            let guide = db
                .get("guides")
                .map(g => Object.assign({parts: g.name.toLowerCase().split(" ")}, g))
                .sortBy(g => g.parts.length)
                .maxBy(k => db._.intersection(parts, k.parts).length)
                .value();
            let hits =
                guide !== undefined &&
                db._.intersection(guide.name.toLowerCase().split(" "), parts).length > 0;
            if (hits) {
                m.channel.send(guide.content);
                return;
            }
        }

        const emoteType = db
            .get("specialUsers")
            .includes(m.author.id)
            .value()
            ? "hug"
            : "angery";
        const id = db
            .get("emotes")
            .get(emoteType)
            .randomElement()
            .value();
        m.channel.send(client.emojis.find(e => e.id == id).toString());
    } else if (m.content.includes("Noct")) {
        m.channel.send(
            client.emojis.find(e => e.name == "mukuNeighWaaaaaa").toString()
        );
    }
});

client.login(TOKEN);