// ==UserScript==
// @name         YouTube: Playlist-Gesamtlänge
// @namespace    https://git.ponywave.de/Akamaru/Userscripts
// @version      1.1
// @description  Berechnet die Gesamtlänge einer YouTube-Playlist
// @author       Akamaru
// @match        https://www.youtube.com/playlist?*
// @icon         https://www.google.com/s2/favicons?domain=youtube.com&sz=32
// @grant        GM_getValue
// @grant        GM_setValue
// @connect      googleapis.com
// @updateURL    https://git.ponywave.de/Akamaru/Userscripts/raw/branch/master/youtube-playlist-duration.user.js
// @downloadURL  https://git.ponywave.de/Akamaru/Userscripts/raw/branch/master/youtube-playlist-duration.user.js
// ==/UserScript==

(function() {
    'use strict';

    // YouTube API Key (optional) - in localStorage speichern
    const API_KEY_STORAGE = 'youtube_playlist_api_key';

    // Warte bis die Seite geladen ist
    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', init);
    } else {
        init();
    }

    function init() {
        // Versuche mehrmals den Button hinzuzufügen
        let attempts = 0;
        const maxAttempts = 10;

        const tryAddButton = () => {
            attempts++;
            console.log(`[Playlist Duration] Versuch ${attempts}/${maxAttempts}`);

            if (addCalculateButton()) {
                console.log('[Playlist Duration] Button erfolgreich hinzugefügt');
                return true;
            }

            if (attempts < maxAttempts) {
                setTimeout(tryAddButton, 1000);
            } else {
                console.error('[Playlist Duration] Konnte Button nicht hinzufügen nach', maxAttempts, 'Versuchen');
            }
            return false;
        };

        // Starte erste Versuche
        setTimeout(tryAddButton, 1000);
    }

    function addCalculateButton() {
        // Prüfe ob Button bereits existiert
        if (document.getElementById('playlist-duration-button')) {
            console.log('[Playlist Duration] Button existiert bereits');
            return true;
        }

        // Prüfe ob wir auf einer echten Playlist-Seite sind (nicht watch)
        if (!window.location.pathname.includes('/playlist') || !window.location.href.includes('list=')) {
            console.log('[Playlist Duration] Nicht auf Playlist-Seite');
            return false;
        }

        console.log('[Playlist Duration] Erstelle Floating Button');

        // Erstelle Floating Button (fixiert rechts oben)
        const button = document.createElement('button');
        button.id = 'playlist-duration-button';
        button.textContent = '⏱️ Playlist-Länge berechnen';
        button.style.cssText = `
            position: fixed;
            top: 80px;
            right: 20px;
            z-index: 9998;
            background: #065fd4;
            color: white;
            border: none;
            border-radius: 18px;
            padding: 10px 16px;
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            box-shadow: 0 2px 8px rgba(0,0,0,0.3);
            transition: background 0.2s;
        `;

        button.addEventListener('mouseenter', () => {
            button.style.background = '#0656c7';
        });

        button.addEventListener('mouseleave', () => {
            button.style.background = '#065fd4';
        });

        button.addEventListener('click', openModal);

        document.body.appendChild(button);

        console.log('[Playlist Duration] Button hinzugefügt');

        return true;
    }

    function openModal() {
        // Erstelle Modal-Overlay
        const overlay = document.createElement('div');
        overlay.id = 'playlist-duration-modal';
        overlay.style.cssText = 'position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.7); z-index: 9999; display: flex; align-items: center; justify-content: center;';

        // Erstelle Modal-Content
        const modal = document.createElement('div');
        modal.style.cssText = 'background: var(--yt-spec-base-background, white); padding: 25px; border-radius: 12px; max-width: 600px; width: 90%; box-shadow: 0 4px 16px rgba(0,0,0,0.3); color: var(--yt-spec-text-primary, black); font-size: 16px;';

        const title = document.createElement('h2');
        title.textContent = 'Playlist-Gesamtlänge';
        title.style.cssText = 'margin: 0 0 20px 0; font-size: 24px;';

        const statusText = document.createElement('p');
        statusText.id = 'duration-status';
        statusText.textContent = 'Scrollen und laden der Videos...';
        statusText.style.cssText = 'margin: 15px 0; font-size: 16px;';

        const infoDiv = document.createElement('div');
        infoDiv.id = 'duration-info';
        infoDiv.style.cssText = 'margin: 20px 0; display: none;';

        const wikiDiv = document.createElement('div');
        wikiDiv.id = 'wiki-format';
        wikiDiv.style.cssText = 'margin: 20px 0; display: none;';

        // API Key Eingabe (ausklappbar)
        const apiKeySection = document.createElement('div');
        apiKeySection.style.cssText = 'margin: 15px 0; padding: 15px; background: rgba(0,0,0,0.05); border-radius: 8px;';

        const apiKeyHeader = document.createElement('div');
        apiKeyHeader.style.cssText = 'display: flex; align-items: center; justify-content: space-between; cursor: pointer;';
        apiKeyHeader.innerHTML = '<span style="font-weight: bold;">⚙️ YouTube API Key (optional)</span><span id="api-toggle">▼</span>';

        const apiKeyContent = document.createElement('div');
        apiKeyContent.id = 'api-key-content';
        apiKeyContent.style.cssText = 'display: none; margin-top: 10px;';

        const apiKeyInfo = document.createElement('div');
        apiKeyInfo.style.cssText = 'font-size: 14px; color: #666; margin-bottom: 8px;';
        apiKeyInfo.textContent = 'Mit einem API-Key werden die exakten Upload-Daten automatisch abgerufen.';

        const apiKeyInputDiv = document.createElement('div');
        apiKeyInputDiv.style.cssText = 'display: flex; gap: 8px; margin-bottom: 8px;';

        const apiKeyInput = document.createElement('input');
        apiKeyInput.type = 'password';
        apiKeyInput.id = 'api-key-input';
        apiKeyInput.placeholder = 'API-Key eingeben...';
        apiKeyInput.style.cssText = 'flex: 1; padding: 6px 10px; border: 1px solid #ccc; border-radius: 4px; font-family: monospace;';
        apiKeyInput.value = GM_getValue(API_KEY_STORAGE, '');

        const toggleVisibilityBtn = document.createElement('button');
        toggleVisibilityBtn.textContent = '👁️';
        toggleVisibilityBtn.style.cssText = 'padding: 6px 12px; border: 1px solid #ccc; border-radius: 4px; cursor: pointer; background: white;';
        toggleVisibilityBtn.onclick = (e) => {
            e.preventDefault();
            apiKeyInput.type = apiKeyInput.type === 'password' ? 'text' : 'password';
        };

        const saveApiKeyBtn = document.createElement('button');
        saveApiKeyBtn.textContent = 'Speichern';
        saveApiKeyBtn.className = 'yt-spec-button-shape-next yt-spec-button-shape-next--filled yt-spec-button-shape-next--mono yt-spec-button-shape-next--size-m';
        saveApiKeyBtn.style.cssText = 'padding: 6px 12px;';
        saveApiKeyBtn.onclick = (e) => {
            e.preventDefault();
            const key = apiKeyInput.value.trim();
            if (key) {
                GM_setValue(API_KEY_STORAGE, key);
                alert('API-Key gespeichert!');
            } else {
                GM_setValue(API_KEY_STORAGE, '');
                alert('API-Key gelöscht!');
            }
        };

        apiKeyInputDiv.appendChild(apiKeyInput);
        apiKeyInputDiv.appendChild(toggleVisibilityBtn);
        apiKeyInputDiv.appendChild(saveApiKeyBtn);

        const apiKeyHelp = document.createElement('div');
        apiKeyHelp.style.cssText = 'font-size: 13px; color: #999; margin-top: 5px;';
        apiKeyHelp.innerHTML = 'Wie erstelle ich einen API-Key? <a href="#" id="api-help-link" style="color: #065fd4;">Anleitung anzeigen</a>';

        apiKeyContent.appendChild(apiKeyInfo);
        apiKeyContent.appendChild(apiKeyInputDiv);
        apiKeyContent.appendChild(apiKeyHelp);

        apiKeySection.appendChild(apiKeyHeader);
        apiKeySection.appendChild(apiKeyContent);

        // Toggle für API-Key Sektion
        apiKeyHeader.onclick = () => {
            const isOpen = apiKeyContent.style.display === 'block';
            apiKeyContent.style.display = isOpen ? 'none' : 'block';
            document.getElementById('api-toggle').textContent = isOpen ? '▼' : '▲';
        };

        // Datum-Eingabefelder
        const dateInputsDiv = document.createElement('div');
        dateInputsDiv.style.cssText = 'margin: 15px 0; padding: 15px; background: rgba(0,0,0,0.05); border-radius: 8px;';

        const dateTitle = document.createElement('div');
        dateTitle.textContent = 'Zeitraum:';
        dateTitle.style.cssText = 'font-weight: bold; margin-bottom: 10px;';

        const startDateDiv = document.createElement('div');
        startDateDiv.style.cssText = 'margin: 8px 0;';
        const startDateLabel = document.createElement('label');
        startDateLabel.textContent = 'Start-Datum: ';
        startDateLabel.style.marginRight = '8px';
        const startDateInput = document.createElement('input');
        startDateInput.type = 'date';
        startDateInput.id = 'start-date-input';
        startDateInput.style.cssText = 'padding: 4px 8px; border: 1px solid #ccc; border-radius: 4px;';
        startDateDiv.appendChild(startDateLabel);
        startDateDiv.appendChild(startDateInput);

        const endDateDiv = document.createElement('div');
        endDateDiv.style.cssText = 'margin: 8px 0;';
        const endDateLabel = document.createElement('label');
        endDateLabel.textContent = 'End-Datum: ';
        endDateLabel.style.marginRight = '8px';
        const endDateInput = document.createElement('input');
        endDateInput.type = 'date';
        endDateInput.id = 'end-date-input';
        endDateInput.style.cssText = 'padding: 4px 8px; border: 1px solid #ccc; border-radius: 4px;';
        endDateDiv.appendChild(endDateLabel);
        endDateDiv.appendChild(endDateInput);

        dateInputsDiv.appendChild(dateTitle);
        dateInputsDiv.appendChild(startDateDiv);
        dateInputsDiv.appendChild(endDateDiv);

        const wikiCheckboxDiv = document.createElement('div');
        wikiCheckboxDiv.style.cssText = 'margin: 10px 0;';

        const finishedCheckbox = document.createElement('input');
        finishedCheckbox.type = 'checkbox';
        finishedCheckbox.id = 'series-finished';
        finishedCheckbox.style.marginRight = '8px';

        const finishedLabel = document.createElement('label');
        finishedLabel.htmlFor = 'series-finished';
        finishedLabel.textContent = 'Serie beendet';

        wikiCheckboxDiv.appendChild(finishedCheckbox);
        wikiCheckboxDiv.appendChild(finishedLabel);

        const wikiTextarea = document.createElement('textarea');
        wikiTextarea.id = 'wiki-output';
        wikiTextarea.readOnly = true;
        wikiTextarea.style.cssText = 'width: 100%; height: 150px; font-family: monospace; font-size: 14px; padding: 10px; border: 1px solid #ccc; border-radius: 4px; resize: vertical;';

        const copyBtn = document.createElement('button');
        copyBtn.textContent = 'Wiki-Format kopieren';
        copyBtn.className = 'yt-spec-button-shape-next yt-spec-button-shape-next--filled yt-spec-button-shape-next--mono yt-spec-button-shape-next--size-m';
        copyBtn.style.cssText = 'margin-top: 10px; margin-right: 10px;';
        copyBtn.onclick = () => {
            wikiTextarea.select();
            document.execCommand('copy');
            copyBtn.textContent = 'Kopiert!';
            setTimeout(() => copyBtn.textContent = 'Wiki-Format kopieren', 2000);
        };

        wikiDiv.appendChild(apiKeySection);
        wikiDiv.appendChild(dateInputsDiv);
        wikiDiv.appendChild(wikiCheckboxDiv);
        wikiDiv.appendChild(wikiTextarea);
        wikiDiv.appendChild(copyBtn);

        // API-Help Link Handler
        setTimeout(() => {
            document.getElementById('api-help-link')?.addEventListener('click', (e) => {
                e.preventDefault();
                showApiHelp();
            });
        }, 100);

        const closeBtn = document.createElement('button');
        closeBtn.textContent = 'Schließen';
        closeBtn.className = 'yt-spec-button-shape-next yt-spec-button-shape-next--tonal yt-spec-button-shape-next--mono yt-spec-button-shape-next--size-m';
        closeBtn.style.cssText = 'margin-top: 20px;';
        closeBtn.onclick = () => overlay.remove();

        modal.appendChild(title);
        modal.appendChild(statusText);
        modal.appendChild(infoDiv);
        modal.appendChild(wikiDiv);
        modal.appendChild(closeBtn);
        overlay.appendChild(modal);
        document.body.appendChild(overlay);

        // Schließe Modal bei Klick auf Overlay
        overlay.addEventListener('click', (e) => {
            if (e.target === overlay) overlay.remove();
        });

        // Starte Berechnung
        calculateDuration(finishedCheckbox, startDateInput, endDateInput);
    }

    async function calculateDuration(finishedCheckbox, startDateInput, endDateInput) {
        const statusText = document.getElementById('duration-status');
        const infoDiv = document.getElementById('duration-info');
        const wikiDiv = document.getElementById('wiki-format');
        const wikiOutput = document.getElementById('wiki-output');

        // Automatisches Scrollen bis alle Videos geladen sind
        statusText.textContent = 'Scrolle bis alle Videos geladen sind...';
        await autoScrollToEnd();

        statusText.textContent = 'Berechne Gesamtlänge...';

        // Sammle alle Video-IDs und Dauern
        const videoData = new Map(); // Map um Duplikate zu vermeiden
        const videoElements = document.querySelectorAll('ytd-playlist-video-renderer');

        videoElements.forEach(element => {
            // Extrahiere Video-ID
            const videoLink = element.querySelector('a#video-title');
            if (!videoLink) return;

            const videoId = new URLSearchParams(videoLink.href.split('?')[1]).get('v');
            if (!videoId) return;

            // Extrahiere Dauer
            const durationElement = element.querySelector('ytd-thumbnail-overlay-time-status-renderer span');
            if (!durationElement) return;

            const durationText = durationElement.textContent.trim();
            if (!durationText) return;

            // Speichere nur einzigartige Videos
            if (!videoData.has(videoId)) {
                videoData.set(videoId, durationText);
            }
        });

        // Versuche Daten via API zu holen, falls API-Key vorhanden
        const apiKey = GM_getValue(API_KEY_STORAGE, '');
        let oldestDate = null;
        let newestDate = null;

        if (apiKey) {
            statusText.textContent = 'Lade Upload-Daten von YouTube API...';
            const playlistId = new URLSearchParams(window.location.search).get('list');
            const dates = await fetchPlaylistDates(playlistId, apiKey);

            if (dates && dates.length > 0) {
                dates.sort((a, b) => a - b);
                oldestDate = dates[0];
                newestDate = dates[dates.length - 1];
                console.log('[Playlist Duration] API-Daten erfolgreich geladen:', { oldestDate, newestDate });
            } else {
                console.log('[Playlist Duration] API-Aufruf fehlgeschlagen oder keine Daten');
            }
        }

        // Berechne Gesamtdauer
        let totalMinutes = 0;
        videoData.forEach((durationText) => {
            const parts = durationText.split(':').map(Number);
            let seconds = 0;
            if (parts.length === 3) {
                seconds = parts[0] * 3600 + parts[1] * 60 + parts[2];
            } else if (parts.length === 2) {
                seconds = parts[0] * 60 + parts[1];
            }
            totalMinutes += Math.ceil(seconds / 60); // Aufrunden auf volle Minuten
        });

        const videoCount = videoData.size;

        // Zeige Informationen
        statusText.style.display = 'none';
        infoDiv.style.display = 'block';
        infoDiv.innerHTML = `
            <p style="margin: 5px 0;"><strong>Videos:</strong> ${videoCount} Folgen</p>
            <p style="margin: 5px 0;"><strong>Gesamtlänge:</strong> ~${totalMinutes} Minuten</p>
        `;

        // Setze Daten: API-Daten falls vorhanden, sonst heutiges Datum
        if (oldestDate && newestDate) {
            startDateInput.valueAsDate = oldestDate;
            endDateInput.valueAsDate = newestDate;
        } else {
            const today = new Date();
            startDateInput.valueAsDate = today;
            endDateInput.valueAsDate = today;
        }

        // Generiere Wiki-Format
        wikiDiv.style.display = 'block';
        const updateWiki = () => {
            generateWikiFormat(videoCount, totalMinutes, finishedCheckbox, wikiOutput, startDateInput, endDateInput);
        };
        updateWiki();

        // Update Wiki-Format bei Änderungen
        finishedCheckbox.addEventListener('change', updateWiki);
        startDateInput.addEventListener('change', updateWiki);
        endDateInput.addEventListener('change', updateWiki);
    }

    function generateWikiFormat(videoCount, totalMinutes, finishedCheckbox, wikiOutput, startDateInput, endDateInput) {
        const playlistUrl = window.location.href;

        // Verwende eingegebene Daten
        const startDate = startDateInput.value ? parseDateInput(startDateInput.value) : formatDate(new Date());
        const endDate = finishedCheckbox.checked ?
            (endDateInput.value ? parseDateInput(endDateInput.value) : formatDate(new Date())) :
            null;

        const finishedClass = finishedCheckbox.checked ? ' lp-finished' : '';

        // Wiki-Text erstellen
        let wikiLines = [];
        wikiLines.push(`|class="dates"| {{SortKey|${startDate.iso}|${startDate.display}}}`);

        // Nur End-Datum Zeile hinzufügen, wenn Serie beendet
        if (finishedCheckbox.checked && endDate) {
            wikiLines.push(`|class="dates${finishedClass}"| {{SortKey|${endDate.iso}|${endDate.display}}}`);
        }

        wikiLines.push(`|class="episodes"| {{nts|${videoCount}}} Folgen`);
        wikiLines.push(`|class="length"| ~ {{nts|${totalMinutes}}} Minuten`);
        wikiLines.push(`|class="link"| <div align="center">[[Datei:YouTubeIcon.png|link=${playlistUrl}]]</div>`);

        wikiOutput.value = wikiLines.join('\n');
    }

    function parseDateInput(dateString) {
        // Date Input Format: YYYY-MM-DD
        const date = new Date(dateString);
        return formatDate(date);
    }

    function formatDate(date) {
        const year = date.getFullYear();
        const month = String(date.getMonth() + 1).padStart(2, '0');
        const day = String(date.getDate()).padStart(2, '0');
        return {
            iso: `${year}-${month}-${day}`,
            display: `${day}.${month}.${year}`
        };
    }

    async function autoScrollToEnd() {
        let lastHeight = 0;
        let sameHeightCount = 0;

        while (sameHeightCount < 3) { // Warte auf 3 gleiche Höhen um sicher zu sein
            window.scrollTo(0, document.documentElement.scrollHeight);
            await new Promise(r => setTimeout(r, 1000));

            const newHeight = document.documentElement.scrollHeight;
            if (newHeight === lastHeight) {
                sameHeightCount++;
            } else {
                sameHeightCount = 0;
            }
            lastHeight = newHeight;
        }

        // Scrolle zurück nach oben
        window.scrollTo(0, 0);
    }

    async function fetchPlaylistDates(playlistId, apiKey) {
        try {
            const dates = [];
            let pageToken = '';
            const maxResults = 50;

            // Hole alle Videos der Playlist (paginiert)
            do {
                const url = `https://www.googleapis.com/youtube/v3/playlistItems?part=contentDetails&playlistId=${playlistId}&maxResults=${maxResults}&pageToken=${pageToken}&key=${apiKey}`;

                const response = await fetch(url);
                if (!response.ok) {
                    console.error('[Playlist Duration] API Error:', response.status, response.statusText);
                    return null;
                }

                const data = await response.json();

                // Sammle Video-IDs
                const videoIds = data.items.map(item => item.contentDetails.videoId);

                // Hole Video-Details (inkl. Upload-Datum)
                const videoDetailsUrl = `https://www.googleapis.com/youtube/v3/videos?part=snippet&id=${videoIds.join(',')}&key=${apiKey}`;
                const videoResponse = await fetch(videoDetailsUrl);

                if (!videoResponse.ok) {
                    console.error('[Playlist Duration] Video API Error:', videoResponse.status);
                    return null;
                }

                const videoData = await videoResponse.json();

                // Extrahiere Upload-Daten
                videoData.items.forEach(video => {
                    if (video.snippet && video.snippet.publishedAt) {
                        dates.push(new Date(video.snippet.publishedAt));
                    }
                });

                pageToken = data.nextPageToken || '';
            } while (pageToken);

            return dates;
        } catch (error) {
            console.error('[Playlist Duration] Fehler beim API-Aufruf:', error);
            return null;
        }
    }

    function showApiHelp() {
        const helpOverlay = document.createElement('div');
        helpOverlay.style.cssText = 'position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.7); z-index: 10000; display: flex; align-items: center; justify-content: center;';

        const helpModal = document.createElement('div');
        helpModal.style.cssText = 'background: white; padding: 30px; border-radius: 12px; max-width: 600px; width: 90%; max-height: 80vh; overflow-y: auto; color: black;';

        helpModal.innerHTML = `
            <h2 style="margin-top: 0;">YouTube API Key erstellen</h2>

            <h3>1. Google Cloud Console öffnen</h3>
            <p>Gehe zu: <a href="https://console.cloud.google.com/" target="_blank" style="color: #065fd4;">https://console.cloud.google.com/</a></p>

            <h3>2. Neues Projekt erstellen</h3>
            <ul>
                <li>Klicke oben auf "Projekt auswählen" → "Neues Projekt"</li>
                <li>Name: z.B. "YouTube Playlist Duration"</li>
                <li>Klicke auf "Erstellen"</li>
            </ul>

            <h3>3. YouTube Data API v3 aktivieren</h3>
            <ul>
                <li>Gehe zu "APIs & Dienste" → "Bibliothek"</li>
                <li>Suche nach "YouTube Data API v3"</li>
                <li>Klicke auf "Aktivieren"</li>
            </ul>

            <h3>4. API-Key erstellen</h3>
            <ul>
                <li>Gehe zu "APIs & Dienste" → "Anmeldedaten"</li>
                <li>Klicke auf "+ Anmeldedaten erstellen" → "API-Schlüssel"</li>
                <li>Kopiere den generierten Key</li>
            </ul>

            <h3>5. API-Key einschränken (empfohlen)</h3>
            <ul>
                <li>Klicke auf den erstellten Key</li>
                <li>Bei "API-Einschränkungen": Wähle "Schlüssel einschränken"</li>
                <li>Aktiviere nur "YouTube Data API v3"</li>
                <li>Speichern</li>
            </ul>

            <p style="margin-top: 20px; padding: 10px; background: #f0f0f0; border-radius: 5px; font-size: 12px;">
                <strong>Hinweis:</strong> Die YouTube API hat ein kostenloses Kontingent von 10.000 Einheiten/Tag.
                Eine Playlist-Abfrage kostet ca. 1-3 Einheiten pro 50 Videos.
            </p>

            <button id="close-help" style="margin-top: 20px; padding: 10px 20px; background: #065fd4; color: white; border: none; border-radius: 5px; cursor: pointer;">Schließen</button>
        `;

        helpOverlay.appendChild(helpModal);
        document.body.appendChild(helpOverlay);

        helpOverlay.addEventListener('click', (e) => {
            if (e.target === helpOverlay || e.target.id === 'close-help') {
                helpOverlay.remove();
            }
        });
    }
})();