function sleep(ms) {
    return new Promise((resolve) => setTimeout(resolve, ms));
}

async function add_boot_entry(entry_object) {
    for (const entry in entry_object) {
        if (do_sleep) {
            let sleep_time;
            if (typeof entry_object[entry]["sleep_time"] !== "undefined") {
                sleep_time = entry_object[entry]["sleep_time"];
            } else {
                sleep_time = Math.floor(Math.random() * 2000 + 500);
            }
            await sleep(sleep_time);
        }

        let new_entry = document.createElement("p");
        new_entry.innerHTML = entry_object[entry]["text"];
        new_entry.classList.add("bmsg");

        let entry_class;
        switch (entry_object[entry]["type"]) {
            case "error":
                entry_class = "error";
                break;

            case "warning":
                entry_class = "warn";
                break;

            case "ok":
                entry_class = "ok";
                break;

            default:
                throw `Type '${entry_object[entry]["type"]}' not found.`;
        }

        new_entry.setAttribute("bmsg_type", entry_class);
        boot.appendChild(new_entry);
    }
}

function hash(string) {
    return string.split("").reduce(function (a, b) {
        a = (a << 5) - a + b.charCodeAt(0);
        return a & a;
    }, 0);
}

function to_filename(filename) {
    return filename.replaceAll(" ", "_");
}

function to_storage(filename) {
    return `file.${to_filename(filename)}`;
}

function file_exists(filename) {
    return to_storage(filename) in window.localStorage;
}

function save_file(filename, content) {
    try {
        window.localStorage.setItem(to_storage(filename), btoa(content));
    } catch (e) {
        alert(`Failed to save ${to_filename(filename)}: ${e}`);
    }
}

function get_file(filename) {
    let file = window.localStorage.getItem(to_storage(filename));
    return file ? atob(file) : "";
}

function remove_file(filename) {
    window.localStorage.removeItem(to_storage(filename));
}

function list_files() {
    let files = [];

    Object.keys(localStorage).forEach((key) => {
        if (key.startsWith("file.")) files.push(key.slice(5));
    });

    return files;
}

function disable(element) {
    element.setAttribute("disabled", "disabled");
    element.setAttribute("readonly", "true");
}

function enable(element) {
    element.removeAttribute("disabled");
    element.removeAttribute("readonly");
}