"use strict";

function clear() {
    document.getElementById("command_output").innerHTML = "";
    document.getElementById("cmd_hist").innerHTML = "";
    document.getElementById("content").innerHTML = "";

    return "";
}

function reboot() {
    window.location.reload();
    return "Rebooting...";
}

function help(cmd) {
    let help_page = "";
    let help_cmd = cmd[0];

    if (help_cmd && !commands[help_cmd]) {
        return `Help page for '${help_cmd}' does not exist`;
    }

    if (help_cmd) {
        let cmd_help = commands[help_cmd]["help"];

        help_page += `<b>NAME</b>: ${help_cmd}<br/>`;
        help_page += `<b>SUID</b>: ${commands[help_cmd]["root_only"]}<br/>`;
        help_page += `<b>DESCRIPTION</b>: ${cmd_help["desc"]}<br/>`;
        help_page += `<b>EXAMPLES</b>:<br/>`;

        for (const example in cmd_help["examples"]) {
            help_page += `<b>$</b> ${cmd_help["examples"][example]}<br/>`;
        }
    } else {
        for (const h in commands) {
            let cmd_help = commands[h]["help"];

            help_page += `<b>NAME</b>: ${h}<br/>`;
            help_page += `<b>SUID</b>: ${commands[h]["root_only"]}<br/>`;
            help_page += `<b>DESCRIPTION</b>: ${cmd_help["short_desc"]}<br/>`;
            help_page += `<b>EXAMPLE</b>: ${cmd_help["examples"][0]}<br/>`;
            help_page += `<br/>`;
        }
    }

    return help_page;
}

function show(dest) {
    let dst = dest[0];
    let iframe = document.createElement("iframe");
    iframe.setAttribute("class", "iframe");

    if (!dst) {
        return help(["show"]);
    } else {
        for (const l in locations) {
            if (locations[l]["aliases"].includes(dst)) {
                iframe.setAttribute("src", locations[l]["url"]);
                break;
            }
        }
    }

    if (iframe.src) {
        return iframe.outerHTML;
    } else {
        return `Page '${dst}' not found`;
    }
}

function cd(dest) {
    let dst = dest[0];

    if (!dst) {
        window.location = "/";
        return "Returning to the home page";
    } else {
        for (const l in locations) {
            if (locations[l]["aliases"].includes(dst)) {
                window.location = locations[l]["url"];
                return `Going to ${locations[l]["url"]}`;
            }
        }
    }

    return `Page ${dst} does not exist`;
}

function list() {
    let locs = "";

    for (const l in locations) {
        let loc = locations[l];
        locs += `<b>URL</b>: ${loc["url"]}<br/>`;
        locs += `<b>DESCRIPTION</b>: ${loc["desc"]}<br/>`;
        locs += `<b>ALIASES</b>: ${loc["aliases"].join(", ")}<br/>`;
        locs += `<br/>`;
    }

    return locs;
}

function su(cmd) {
    let password_hash;
    if (!root) {
        password_hash = hash(prompt("Enter your password"));
    }

    if (!password_hash && !root) {
        return "Not authenticated. (empty password)";
    }

    if (password_hash != localStorage.getItem("password") && !root) {
        return "Wrong password.";
    }

    if (cmd[0]) {
        if (cmd[0] === ".") {
            root = !root;
            return `Switched to the <b>${
                root ? "root" : escape_HTML(localStorage.getItem("username"))
            }</b> user.`;
        } else {
            root = true;
            let ret = "Command not found";
            let err = false;

            try {
                ret = commands[cmd[0]]["func"](cmd.slice(1));
            } catch (e) {
                if (e.constructor !== TypeError) err = e;
            }

            root = false;

            if (err) {
                alert(`ERROR (report it to 'cd src'): ${err}`);
                throw err;
            }

            return ret;
        }
    } else {
        return help(["su"]);
    }
}

function passwd() {
    let current_password = hash(prompt("Current password"));
    let password1 = prompt("New password");
    let password2 = prompt("Confirm new password");

    if (current_password === parseInt(localStorage.getItem("password"))) {
        if (password1 === password2) {
            localStorage.setItem("password", hash(password1));
            alert(`password set`);
        } else {
            return "Passwords don't match";
        }
    } else {
        return "Wrong password";
    }
}

function whoami() {
    return root ? "root" : escape_HTML(window.localStorage.getItem("username"));
}

function echo(argv) {
    return escape_HTML(argv.join(" "));
}

function webfetch() {
    let head_str = `${whoami()}@${site_name}`;

    return `\`8.\`888b                 ,8'      ${head_str}
 \`8.\`888b               ,8'       ${"-".repeat(head_str.length)}
  \`8.\`888b             ,8'        OS: WebOS
   \`8.\`888b     .b    ,8'         Kernel: Wkernel ${kernel_version}
    \`8.\`888b    88b  ,8'          Shell: Wsh
     \`8.\`888b .\`888b,8'           Terminal: HTML
      \`8.\`888b8.\`8888'            CPU: ${site_name[0].toUpperCase()}${site_name.slice(1)} web cpu (1) @ 1GHz
       \`8.\`888\`8.\`88'             Memory: 2B / 8B
        \`8.\`8' \`8,\`'              Init: WebRC
         \`8.\`   \`8'`;
}