/**
 * WebSocket-Client fuer Echtzeit-Updates
 * Verbindet sich mit dem Server und aktualisiert Dashboard dynamisch
 */

let ws = null;
let videoActive = {};
let videoQueue = {};
let reconnectTimer = null;
let queuePaused = false;

// WebSocket verbinden
function connectWebSocket() {
    if (!window.WS_URL) return;

    ws = new WebSocket(WS_URL);

    ws.onopen = function () {
        console.log("WebSocket verbunden:", WS_URL);
        if (reconnectTimer) {
            clearTimeout(reconnectTimer);
            reconnectTimer = null;
        }
    };

    ws.onmessage = function (event) {
        try {
            const packet = JSON.parse(event.data);

            if (packet.data_flow !== undefined) {
                updateProgress(packet.data_flow);
            } else if (packet.data_convert !== undefined) {
                updateActiveConversions(packet.data_convert);
            } else if (packet.data_queue !== undefined) {
                updateQueue(packet.data_queue);
                if (packet.queue_paused !== undefined) {
                    updatePauseState(packet.queue_paused);
                }
            } else if (packet.data_log !== undefined) {
                // Log-Nachrichten ans Benachrichtigungs-System weiterleiten
                if (typeof addNotification === "function") {
                    addNotification(packet.data_log.message, packet.data_log.level);
                }
            } else if (packet.data_import !== undefined) {
                // Import-Fortschritt an Library weiterleiten
                if (typeof handleImportWS === "function") {
                    handleImportWS(packet.data_import);
                }
            } else if (packet.data_library_scan !== undefined) {
                // Scan-Fortschritt an Library weiterleiten
                if (typeof handleScanWS === "function") {
                    handleScanWS(packet.data_library_scan);
                }
            }
            // Globaler Progress-Balken aktualisieren
            if (typeof _updateGlobalProgress === "function") {
                _updateGlobalProgress(packet);
            }
        } catch (e) {
            console.error("WebSocket Nachricht parsen fehlgeschlagen:", e);
        }
    };

    ws.onclose = function () {
        console.log("WebSocket getrennt, Reconnect in 3s...");
        reconnectTimer = setTimeout(connectWebSocket, 3000);
    };

    ws.onerror = function (err) {
        console.error("WebSocket Fehler:", err);
    };
}

// === Aktive Konvertierungen ===

function updateActiveConversions(data) {
    const container = document.getElementById("active-conversions");
    if (!container) return;

    // Entfernte Jobs loeschen
    for (const key in videoActive) {
        if (!(key in data)) {
            const elem = document.getElementById("convert_" + key);
            if (elem) elem.remove();
            delete videoActive[key];
        }
    }

    // Neue Jobs hinzufuegen
    for (const [key, video] of Object.entries(data)) {
        if (!videoActive[key]) {
            const card = document.createElement("div");
            card.className = "video-card";
            card.id = "convert_" + key;
            card.innerHTML = `
                <h3 title="${video.source_path}">${video.source_file_name} &rarr; ${video.target_file_name}</h3>
                <div class="progress-container">
                    <div class="progress-bar"></div>
                </div>
                <div class="progress-text">
                    <span class="loading-pct">0</span>%
                </div>
                <div class="video-card-values">
                    <div class="video-card-values-items"><b>Frames</b><br><span class="frames">0</span></div>
                    <div class="video-card-values-items"><b>FPS</b><br><span class="fps">0</span></div>
                    <div class="video-card-values-items"><b>Speed</b><br><span class="speed">0</span>x</div>
                    <div class="video-card-values-items"><b>Groesse</b><br><span class="size">0</span> <span class="size_unit">KiB</span></div>
                    <div class="video-card-values-items"><b>Bitrate</b><br><span class="bitrate">0</span> <span class="bitrate_unit">kbits/s</span></div>
                    <div class="video-card-values-items"><b>Zeit</b><br><span class="time">0 Min</span></div>
                    <div class="video-card-values-items"><b>Verbleibend</b><br><span class="eta">-</span></div>
                    <div class="video-card-values-items">
                        <button class="btn-danger" onclick="sendCommand('cancel', ${key})">Abbrechen</button>
                    </div>
                </div>
            `;
            container.appendChild(card);
            videoActive[key] = video;
        }
    }
}

function updateProgress(flow) {
    const container = document.getElementById("convert_" + flow.id);
    if (!container) return;

    container.querySelector(".frames").textContent = flow.frames || 0;
    container.querySelector(".fps").textContent = flow.fps || 0;
    container.querySelector(".speed").textContent = flow.speed || 0;
    container.querySelector(".size").textContent = flow.size ? flow.size[0] : 0;
    container.querySelector(".size_unit").textContent = flow.size ? flow.size[1] : "KiB";
    container.querySelector(".bitrate").textContent = flow.bitrate ? flow.bitrate[0] : 0;
    container.querySelector(".bitrate_unit").textContent = flow.bitrate ? flow.bitrate[1] : "kbits/s";
    container.querySelector(".time").textContent = flow.time || "0 Min";
    container.querySelector(".eta").textContent = flow.time_remaining || "-";
    container.querySelector(".loading-pct").textContent = (flow.loading || 0).toFixed(1);

    const bar = container.querySelector(".progress-bar");
    bar.style.width = (flow.loading || 0) + "%";
}

// === Warteschlange ===

function updateQueue(data) {
    const container = document.getElementById("queue");
    if (!container) return;

    // Entfernte/geaenderte Jobs loeschen
    for (const key in videoQueue) {
        if (!(key in data) || videoQueue[key]?.status !== data[key]?.status) {
            const elem = document.getElementById("queue_" + key);
            if (elem) elem.remove();
            delete videoQueue[key];
        }
    }

    // Neue Jobs hinzufuegen
    for (const [key, video] of Object.entries(data)) {
        if (!videoQueue[key]) {
            const card = document.createElement("div");
            card.className = "queue-card";
            card.id = "queue_" + key;

            let statusHtml;
            if (video.status === 1) {
                statusHtml = '<span class="status-badge active">Aktiv</span>';
            } else if (video.status === 3) {
                statusHtml = '<span class="status-badge error">Fehler</span>';
            } else if (video.status === 4) {
                statusHtml = '<span class="status-badge warn">Abgebrochen</span>';
            } else {
                statusHtml = '<span class="status-badge queued">Wartend</span>';
            }

            card.innerHTML = `
                <h4 title="${video.source_path}">${video.source_file_name}</h4>
                <div class="queue-card-footer">
                    ${statusHtml}
                    <div>
                        ${video.status === 3 || video.status === 4 ?
                            `<button class="btn-secondary btn-small" onclick="sendCommand('retry', ${key})">Wiederholen</button>` : ""}
                        <button class="btn-danger btn-small" onclick="sendCommand('delete', ${key})">Loeschen</button>
                    </div>
                </div>
            `;
            container.appendChild(card);
            videoQueue[key] = video;
        }
    }
}

// === Befehle senden ===

function sendCommand(command, id) {
    if (ws && ws.readyState === WebSocket.OPEN) {
        ws.send(JSON.stringify({
            data_command: { cmd: command, id: id }
        }));
    } else {
        console.warn("WebSocket nicht verbunden");
    }
}

// === Queue Pause/Resume ===

function updatePauseState(paused) {
    queuePaused = paused;
    const btn = document.getElementById("btn-queue-pause");
    const hint = document.getElementById("queue-paused-hint");
    if (btn) {
        btn.innerHTML = paused ? "&#9654; Weiter" : "&#9208; Pause";
        btn.className = paused ? "btn-primary btn-small" : "btn-secondary btn-small";
    }
    if (hint) {
        hint.style.display = paused ? "" : "none";
    }
}

function toggleQueuePause() {
    const url = queuePaused ? "/api/queue/resume" : "/api/queue/pause";
    fetch(url, {method: "POST"})
        .then(r => r.json())
        .then(data => updatePauseState(data.paused))
        .catch(e => console.error("Pause/Resume fehlgeschlagen:", e));
}

// Verbindung herstellen
connectWebSocket();