// ==== FRONTEND app.js ====

// Service-Liste
const services = [
  { id: "abc", name: "Control GamePad", url: "https://tccontrol.server.schooltech.ch/" },
  { id: "xyz", name: "Guacamole", url: "https://rp5guac.server.schooltech.ch/" },
  { id: "sim", name: "Simulation", url: "https://tcSimulation.server.schooltech.ch/" },
  { id: "video", name: "Video", url: "https://robotVideo.server.schooltech.ch/" },
  { id: "homing", name: "Homing", url:"https://robotHoming.server.schooltech.ch/"}, 
  { id: "base", name:"RobotBase", url:"https://robotBase.server.schooltech.ch/"}, 
  { id: "ellbow", name:"RobotEllbow", url:"https://robotEllbow.server.schooltech.ch/"}, 
  { id: "hand", name:"RobotHand", url:"https://robotHand.server.schooltech.ch/"},
  { id: "driver", name:"RobotDriver", url:"https://robotdriver.server.schooltech.ch/"},
  { id: "code", name:"VSCode", url:"https://robotVSCode.server.schooltech.ch/"}
];

// DOM-Elemente
const iframe = document.getElementById("service-frame");
const loginModal = document.getElementById("login-modal");
const loginBtn = document.getElementById("login-btn");
const loginSubmit = document.getElementById("login-submit");
const loginMsg = document.getElementById("login-msg");
const nav = document.getElementById("services");
const estopBtn = document.getElementById("emergency-stop");

const usernameInput = document.getElementById("username");
const passwordInput = document.getElementById("password");

let loggedIn = false;
let armedPollInterval = null;

// ===========================
// Login anzeigen
// ===========================
function switchToLogin() {
    loginBtn.textContent = "Login";
    loginBtn.onclick = () => {
        loginModal.style.display = "block";
    };
}

// ===========================
// Logout anzeigen
// ===========================
function switchToLogout() {
    loginBtn.textContent = "Logout";
    loginBtn.onclick = async () => {
        try {
            await fetch("/api/logout", { method: "POST" });
        } catch (e) {
            console.warn("Logout request failed:", e);
        }
        performLocalLogout();
    };
}

// ===========================
// Lokales Logout
// ===========================
function performLocalLogout() {
    loggedIn = false;
    stopArmedPolling();
    estopBtn.style.display = "none";
    iframe.src = "";
    iframe.style.display = "none";
    nav.innerHTML = "";
    loginModal.style.display = "block";
    switchToLogin();
}

// ===========================
// Armed-Status prüfen
// ===========================
const POWER_STATUS_URL = 'https://robotdriver.server.schooltech.ch/api/power-status';
const ESTOP_URL        = 'https://robotdriver.server.schooltech.ch/api/emergency-stop';

async function updateArmedStatus() {
    console.log('[armed-check] GET', POWER_STATUS_URL);
    try {
        const r = await fetch(POWER_STATUS_URL);
        if (r.ok) {
            const data = await r.json();
            console.log('[armed-check] response:', data);
            estopBtn.style.display = data.armed ? "block" : "none";
        } else {
            console.warn('[armed-check] HTTP', r.status, '– Button versteckt');
            estopBtn.style.display = "none";
        }
    } catch (e) {
        console.error('[armed-check] Fehler bei', POWER_STATUS_URL, '–', e.message);
        estopBtn.style.display = "none";
    }
}

function startArmedPolling() {
    updateArmedStatus();
    armedPollInterval = setInterval(updateArmedStatus, 5000);
}

function stopArmedPolling() {
    if (armedPollInterval) {
        clearInterval(armedPollInterval);
        armedPollInterval = null;
    }
}

// ===========================
// Emergency Stop
// ===========================
estopBtn.addEventListener("click", async () => {
    console.log('[estop] POST', ESTOP_URL);
    try {
        const r = await fetch(ESTOP_URL, { method: 'POST' });
        console.log('[estop] response HTTP', r.status);
    } catch (e) {
        console.error('[estop] Fehler bei', ESTOP_URL, '–', e.message);
    }
});

// ===========================
// Login-Logik
// ===========================
async function doLogin() {
    const user = usernameInput.value;
    const pass = passwordInput.value;

    try {
        const res = await fetch("/api/login", {
            method: "POST",
            headers: { "Content-Type": "application/json" },
            body: JSON.stringify({ user, pass })
        });

        if (res.ok) {
            loggedIn = true;
            loginModal.style.display = "none";
            loginMsg.textContent = "";
            setupServiceButtons();
            switchToLogout();
            startArmedPolling();
        } else {
            loginMsg.textContent = "Login fehlgeschlagen";
        }
    } catch (e) {
        loginMsg.textContent = "Fehler: " + e.message;
    }
}

loginSubmit.onclick = doLogin;

// Enter-Taste Login
[usernameInput, passwordInput].forEach(input => {
    input.addEventListener('keydown', (e) => {
        if (e.key === 'Enter') {
            e.preventDefault();
            doLogin();
        }
    });
});

// ===========================
// Buttons erzeugen
// ===========================
function setupServiceButtons() {
    nav.innerHTML = "";
    services.forEach(svc => {
        console.log("Service " + svc.name + " wird als Button angefuegt");
        const btn = document.createElement("button");
        btn.textContent = svc.name;
        btn.onclick = async () => {
            try {
                await fetch('/api/event', {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify({
                        event: 'open',
                        service: svc.id,
                        url: svc.url
                    })
                });
            } catch(e) {
                console.error('Event log failed', e);
            }
            
            document.querySelectorAll("nav button").forEach(b => b.classList.remove("active"));
            btn.classList.add("active");

            openService(svc);
        };
        nav.appendChild(btn);
    });
}

// ===========================
// Service öffnen
// ===========================
function openService(svc) {
    iframe.src = svc.url;
    iframe.style.display = "block";
    window.scrollTo(0,0);
}

// ===========================
// Session Status beim Laden prüfen
// ===========================
(async function checkStatus() {
    try {
        const r = await fetch('/api/status');
        if (r.ok) {
            loggedIn = true;
            setupServiceButtons();
            switchToLogout();
            startArmedPolling();
        } else {
            switchToLogin();
        }
    } catch (e) {
        switchToLogin();
    }
})();