require("dotenv").config({path: process.env.MODULES_DIR + "/meme_generator/.env"});

const Imgflip = require("imgflip.com").Imgflip;
const imgflip = new Imgflip();

const fs = require("fs");

const shortcutMemes = {
    "perhaps": 105577219,
    "drake": 181913649
}

let meme = undefined;

let command = process.argv[2].substring(6);

let paramLimiter = command.indexOf(' ') === -1 ? command.length : command.indexOf(' ');

let memeParameter = command.substring(0, paramLimiter);

let paramDivider = command.indexOf('-') === -1 ? command.length : command.indexOf('-');

let text0 = command.substring(paramLimiter, paramDivider);

let text1 = command.substring(paramDivider + 2);

switch(memeParameter) {
    case "help":
        printHelp();
        return;
    case "shortcuts":
        printShortcuts();
        return;
    default:
        break;
}

if(/^\d+$/.test(memeParameter)) {
    meme = memeParameter;
} else {
    meme = shortcutMemes[memeParameter];

    if(meme === undefined) {
        printError();
        return;
    }
}

function requestMeme() {
    return imgflip.api
        .captionImage({
            username: process.env.IMGFLIP_USER,
            password: process.env.IMGFLIP_PASSWORD,
            template_id: meme,
            text0: text0 || ' ',
            text1: text1 || ' '
        })
        .then(res => res)
        .catch(err => console.error(err));
}

function printError() {
    console.log("Failed to generate meme");
}

function printShortcuts() {
    let fields = [];

    for(let shortcut in shortcutMemes) {
        fields.push({
            name: shortcut,
            value: "https://imgflip.com/memegenerator/" + shortcutMemes[shortcut],
            inline: true
        })
    }

    console.log(JSON.stringify({
        status: "success",
        action: "standard",
        format: "embed",
        profile: {
            color: 0x0099f,
            title: "Meme shortcuts",
            url: undefined,
            author: undefined,
            description: "Meme shortcuts, linked to respective template id",
            thumbnail: undefined,
            fields: fields
        }
    }));
}

function printHelp() {
    console.log(JSON.stringify({
        status: "success",
        action: "standard",
        format: "embed",
        profile: {
            color: 0x0099f,
            title: "Meme generator",
            url: undefined,
            author: undefined,
            description: "Generate meme using imgflip API",
            thumbnail: undefined,
            fields: [
                {
                    name: "`!meme <shortcut> <text 1/optional> <text 2/optional>`",
                    value: "Generate a meme using the given shortcut and the two provided texts (if provided)",
                    inline: false,
                },
                {
                    name: "`!meme <template id> <text 1/optional> <text 2/optional>`",
                    value: "Generate a meme using the given template id and the two provided texts (if provided)",
                    inline: false,
                },
                {
                    name: "`!meme shortcuts`",
                    value: "List available shortcuts",
                    inline: false,
                },
                {
                    name: "`!meme help`",
                    value: "Display this help menu",
                    inline: false,
                },
            ]
        }
    }));
}

function formatOutput(result) {
    if(result.success === true) {
        console.log(result.data.url);
    } else {
        printError();
    }
}

requestMeme().then(res => formatOutput(res));