let workshop_object = require("./workshop.json");
const fs = require('fs');
const fs_extra = require("fs-extra");
const util = require('util');

async function download({ published_file_id, name, updated }) {
    const execFile = util.promisify(require('child_process').execFile);

    let { steam_user, steam_pass, app_id, mod_dir, SteamCMD } = require('./config.json');


    let args = [
        // `+force_install_dir ${mod_dir}`, wee thing doesnt just throw the downloaded folders into the directory, it creates the whole steam tree
        `+login ${steam_user} ${steam_pass}`,
        `+workshop_download_item ${app_id} ${published_file_id}`,
        `+quit`
    ];

    console.log("Checking Directory Existence...")
    if (fs.existsSync(mod_dir + `\\${published_file_id}`)) {
        console.log("Directory Exists Already");
        return -4; // Mod Already Exists
    }

    // Process currently doesnt seem to exit. Need to solve this somehow
    let process = await execFile(SteamCMD, args, (error, stderr, stdout) => {
        if (error) {
            console.log("Error:");
            console.log(error);
            return -1; // Some Other Error, likely with execFile call
        };

        if (stderr.search("Success") == -1) {
            console.log("STDError:");
            console.log(stderr);
            return -2; // Download Error
        };

        if (stderr.search("Success") > -1) {
            console.log("SUCCESS");
            console.log(stderr);
        };

        let path = stderr.substring(stderr.indexOf("\"") + 1);
        path = path.substring(0, path.indexOf("\""));

        let new_mod_dir = mod_dir + `\\${published_file_id}`;

        console.log("Moving...");
        fs_extra.move(path, new_mod_dir, err => {
            if (err) return -3; // Move Destination Error

            console.log(`Your mod has been moved to the following directory:\n${new_mod_dir}`)
        })

        console.log("Creating Workshop Object...");

        // Creating the game ID property
        workshop_object[app_id] = workshop_object[app_id];

        // Creating the mod ID property inside the newly created (or existing) game id property
        workshop_object[app_id][published_file_id] = { name: name, updated: updated};
        console.log(workshop_object);

        const jsonString = JSON.stringify(workshop_object);

        console.log("Updating Workshop.json...")
        fs.writeFileSync('./workshop.json', jsonString, err => {
            if (err) {
                console.log('Error writing file, reverting changes', err);
                fs_extra.remove(new_mod_dir);
            } else {
                console.log('Successfully wrote file');
            };
        });

        // SteamCMD doesnt use stdout for some reason?
        // console.log(stdout);
        return 0; // Shouldnt get this code, just an in-case thing
    });
}

async function delete_mod(app_id, published_file_id) {

}
module.exports = { download };