/**
 * AegisSight Chat-Assistent Widget.
 */
const Chat = {
    _conversationId: null,
    _isOpen: false,
    _isLoading: false,
    _hasGreeted: false,
    _tutorialHintDismissed: false,
    _isFullscreen: false,

    init() {
        const btn = document.getElementById('chat-toggle-btn');
        const closeBtn = document.getElementById('chat-close-btn');
        const form = document.getElementById('chat-form');
        const input = document.getElementById('chat-input');

        if (!btn || !form) return;

        btn.addEventListener('click', () => this.toggle());
        closeBtn.addEventListener('click', () => this.close());

        const resetBtn = document.getElementById('chat-reset-btn');
        if (resetBtn) resetBtn.addEventListener('click', () => this.reset());

        const fsBtn = document.getElementById('chat-fullscreen-btn');
        if (fsBtn) fsBtn.addEventListener('click', () => this.toggleFullscreen());

        form.addEventListener('submit', (e) => {
            e.preventDefault();
            this.send();
        });

        // Enter sendet, Shift+Enter für Zeilenumbruch
        input.addEventListener('keydown', (e) => {
            if (e.key === 'Enter' && !e.shiftKey) {
                e.preventDefault();
                this.send();
            }
        });

        // Auto-resize textarea
        input.addEventListener('input', () => {
            input.style.height = 'auto';
            input.style.height = Math.min(input.scrollHeight, 120) + 'px';
        });
    },

    toggle() {
        if (this._isOpen) {
            this.close();
        } else {
            this.open();
        }
    },

    open() {
        const win = document.getElementById('chat-window');
        const btn = document.getElementById('chat-toggle-btn');
        if (!win) return;
        win.classList.add('open');
        btn.classList.add('active');
        this._isOpen = true;

        if (!this._hasGreeted) {
            this._hasGreeted = true;
            this.addMessage('assistant', 'Hallo! Ich bin der AegisSight Assistent. Stell mir gerne jede Frage rund um die Bedienung des Monitors, ich helfe dir weiter.');
        }

        // Tutorial-Hinweis bei jedem Oeffnen aktualisieren (wenn nicht dismissed)
        if (typeof Tutorial !== 'undefined' && !this._tutorialHintDismissed) {
            var oldHint = document.getElementById('chat-tutorial-hint');
            if (oldHint) oldHint.remove();
            this._showTutorialHint();
        }

        // Focus auf Input
        setTimeout(() => {
            const input = document.getElementById('chat-input');
            if (input) input.focus();
        }, 200);
    },

    close() {
        const win = document.getElementById('chat-window');
        const btn = document.getElementById('chat-toggle-btn');
        if (!win) return;
        win.classList.remove('open');
        win.classList.remove('fullscreen');
        btn.classList.remove('active');
        this._isOpen = false;
        this._isFullscreen = false;
        const fsBtn = document.getElementById('chat-fullscreen-btn');
        if (fsBtn) {
            fsBtn.title = 'Vollbild';
            fsBtn.innerHTML = '<svg viewBox="0 0 24 24" width="15" height="15"><path d="M7 14H5v5h5v-2H7v-3zm-2-4h2V7h3V5H5v5zm12 7h-3v2h5v-5h-2v3zM14 5v2h3v3h2V5h-5z" fill="currentColor"/></svg>';
        }
    },

    reset() {
        this._conversationId = null;
        this._hasGreeted = false;
        this._isLoading = false;
        const container = document.getElementById('chat-messages');
        if (container) container.innerHTML = '';
        this._updateResetBtn();
        this.open();
    },

    toggleFullscreen() {
        const win = document.getElementById('chat-window');
        const btn = document.getElementById('chat-fullscreen-btn');
        if (!win) return;
        this._isFullscreen = !this._isFullscreen;
        win.classList.toggle('fullscreen', this._isFullscreen);
        if (btn) {
            btn.title = this._isFullscreen ? 'Vollbild beenden' : 'Vollbild';
            btn.innerHTML = this._isFullscreen
                ? '<svg viewBox="0 0 24 24" width="15" height="15"><path d="M5 16h3v3h2v-5H5v2zm3-8H5v2h5V5H8v3zm6 11h2v-3h3v-2h-5v5zm2-11V5h-2v5h5V8h-3z" fill="currentColor"/></svg>'
                : '<svg viewBox="0 0 24 24" width="15" height="15"><path d="M7 14H5v5h5v-2H7v-3zm-2-4h2V7h3V5H5v5zm12 7h-3v2h5v-5h-2v3zM14 5v2h3v3h2V5h-5z" fill="currentColor"/></svg>';
        }
    },

    _updateResetBtn() {
        const btn = document.getElementById('chat-reset-btn');
        if (btn) btn.style.display = this._conversationId ? '' : 'none';
    },

    async send() {
        const input = document.getElementById('chat-input');
        const text = (input.value || '').trim();
        if (!text || this._isLoading) return;

        input.value = '';
        input.style.height = 'auto';
        this.addMessage('user', text);
        this._showTyping();
        this._isLoading = true;

        // Tutorial-Keywords abfangen
        var lowerText = text.toLowerCase();
        if (lowerText === 'rundgang' || lowerText === 'tutorial' || lowerText === 'tour' || lowerText === 'f\u00fchrung') {
            this._hideTyping();
            this._isLoading = false;
            this.close();
            if (typeof Tutorial !== 'undefined') Tutorial.start();
            return;
        }

        try {
            const body = {
                message: text,
                conversation_id: this._conversationId,
            };

            // Aktuelle Lage mitschicken falls geoeffnet
            const incidentId = this._getIncidentContext();
            if (incidentId) {
                body.incident_id = incidentId;
            }

            const data = await this._request(body);
            this._conversationId = data.conversation_id;
            this._updateResetBtn();
            this._hideTyping();
            this.addMessage('assistant', data.reply);
            this._highlightUI(data.reply);
        } catch (err) {
            this._hideTyping();
            const msg = err.detail || err.message || 'Etwas ist schiefgelaufen. Bitte versuche es erneut.';
            this.addMessage('assistant', msg);
        } finally {
            this._isLoading = false;
        }
    },

    addMessage(role, text) {
        const container = document.getElementById('chat-messages');
        if (!container) return;

        const bubble = document.createElement('div');
        bubble.className = 'chat-message ' + role;

        // Einfache Formatierung: Zeilenumbrueche und Fettschrift
        const formatted = text
            .replace(/&/g, '&amp;')
            .replace(/</g, '&lt;')
            .replace(/>/g, '&gt;')
            .replace(/\*\*(.+?)\*\*/g, '<strong>$1</strong>')
            .replace(/\n/g, '<br>');

        bubble.innerHTML = '<div class="chat-bubble">' + formatted + '</div>';
        container.appendChild(bubble);

        // User-Nachrichten: nach unten scrollen. Antworten: zum Anfang der Antwort scrollen.
        if (role === 'user') {
            container.scrollTop = container.scrollHeight;
        } else {
            bubble.scrollIntoView({ behavior: 'smooth', block: 'start' });
        }
    },

    _showTyping() {
        const container = document.getElementById('chat-messages');
        if (!container) return;
        const el = document.createElement('div');
        el.className = 'chat-message assistant chat-typing-msg';
        el.innerHTML = '<div class="chat-bubble chat-typing"><span></span><span></span><span></span></div>';
        container.appendChild(el);
        container.scrollTop = container.scrollHeight;
    },

    _hideTyping() {
        const el = document.querySelector('.chat-typing-msg');
        if (el) el.remove();
    },

    _getIncidentContext() {
        if (typeof App !== 'undefined' && App.currentIncidentId) {
            return App.currentIncidentId;
        }
        return null;
    },

    async _request(body) {
        const token = localStorage.getItem('osint_token');
        const resp = await fetch('/api/chat', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
                'Authorization': token ? 'Bearer ' + token : '',
            },
            body: JSON.stringify(body),
        });
        if (!resp.ok) {
            const data = await resp.json().catch(() => ({}));
            throw data;
        }
        return await resp.json();
    },
    // -----------------------------------------------------------------------
    // UI-Highlight: Bedienelemente im Dashboard hervorheben wenn im Chat erwaehnt
    // -----------------------------------------------------------------------
    _UI_HIGHLIGHTS: [
        { keywords: ['neue lage', 'lage erstellen', 'lage anlegen', 'recherche erstellen', 'neuen fall'], selector: '#new-incident-btn' },
        { keywords: ['theme wechseln', 'theme-umschalter', 'farbschema', 'helles design', 'dunkles design', 'hell- und dunkel', 'hellem und dunklem', 'dark mode', 'light mode'], selector: '#theme-toggle' },
        { keywords: ['barrierefreiheit', 'accessibility', 'hoher kontrast', 'focus-anzeige', 'groessere schrift', 'animationen aus'], selector: '#a11y-btn' },
        { keywords: ['abmelden', 'logout', 'ausloggen', 'abmeldung'], selector: '#logout-btn' },
        { keywords: ['benachrichtigung', 'glocken-symbol', 'abonnieren', 'abonniert'], selector: '#notification-btn' },
        { keywords: ['aktualisieren', 'refresh starten'], selector: '#refresh-btn' },
        { keywords: ['exportieren', 'export-button', 'lagebericht exportieren'], selector: 'button[onclick*="toggleExportDropdown"]' },
        { keywords: ['faktencheck', 'factcheck'], selector: '[gs-id="factcheck"]' },
        { keywords: ['kartenansicht', 'karte angezeigt', 'interaktive karte', 'geoparsing'], selector: '[gs-id="map"]' },
        { keywords: ['quellen verwalten', 'quellenverwaltung', 'quelleneinstellung', 'quellenausschluss', 'quellen-einstellung'], selector: 'button[onclick*="openSourceManagement"]' },
        { keywords: ['sichtbarkeit', 'privat oder oeffentlich', 'lage privat'], selector: '#incident-settings-btn' },
        { keywords: ['eigene lagen', 'nur eigene'], selector: '.sidebar-filter-btn[data-filter="mine"]' },
        { keywords: ['alle lagen anzeigen'], selector: '.sidebar-filter-btn[data-filter="all"]' },
        { keywords: ['feedback senden', 'feedback geben', 'rueckmeldung'], selector: 'button[onclick*="openFeedback"]' },
        { keywords: ['lage loeschen', 'lage entfernen', 'fall loeschen'], selector: '#delete-incident-btn' },
    ],

    _highlightUI(text) {
        if (!text) return;
        var lower = text.toLowerCase();
        var highlighted = new Set();
        for (var i = 0; i < this._UI_HIGHLIGHTS.length; i++) {
            var entry = this._UI_HIGHLIGHTS[i];
            for (var k = 0; k < entry.keywords.length; k++) {
                var kw = entry.keywords[k];
                if (lower.indexOf(kw) !== -1) {
                    var selectors = entry.selector.split(',');
                    for (var s = 0; s < selectors.length; s++) {
                        var sel = selectors[s].trim();
                        if (highlighted.has(sel)) continue;
                        var el = document.querySelector(sel);
                        if (el) {
                            highlighted.add(sel);
                            el.scrollIntoView({ behavior: 'smooth', block: 'center' });
                            (function(element) {
                                setTimeout(function() {
                                    element.classList.add('chat-ui-highlight');
                                }, 400);
                                setTimeout(function() {
                                    element.classList.remove('chat-ui-highlight');
                                }, 4400);
                            })(el);
                        }
                    }
                    break;
                }
            }
        }
    },

    async _showTutorialHint() {
        var container = document.getElementById('chat-messages');
        if (!container) return;

        // API-State laden (Fallback: Standard-Hint)
        var state = null;
        try { state = await API.getTutorialState(); } catch(e) {}

        var hint = document.createElement('div');
        hint.className = 'chat-tutorial-hint';
        hint.id = 'chat-tutorial-hint';
        var textDiv = document.createElement('div');
        textDiv.className = 'chat-tutorial-hint-text';
        textDiv.style.cursor = 'pointer';

        if (state && !state.completed && state.current_step !== null && state.current_step > 0) {
            // Mittendrin abgebrochen
            var totalSteps = (typeof Tutorial !== 'undefined') ? Tutorial._steps.length : 32;
            textDiv.innerHTML = '<strong>Tipp:</strong> Sie haben den Rundgang bei Schritt ' + (state.current_step + 1) + '/' + totalSteps + ' unterbrochen. Klicken Sie hier, um fortzusetzen.';
            textDiv.addEventListener('click', function() {
                Chat.close();
                Chat._tutorialHintDismissed = true;
                if (typeof Tutorial !== 'undefined') Tutorial.start();
            });
        } else if (state && state.completed) {
            // Bereits abgeschlossen
            textDiv.innerHTML = '<strong>Tipp:</strong> Sie haben den Rundgang bereits abgeschlossen. <span style="text-decoration:underline;">Erneut starten?</span>';
            textDiv.addEventListener('click', async function() {
                Chat.close();
                Chat._tutorialHintDismissed = true;
                try { await API.resetTutorialState(); } catch(e) {}
                if (typeof Tutorial !== 'undefined') Tutorial.start(true);
            });
        } else {
            // Nie gestartet
            textDiv.innerHTML = '<strong>Tipp:</strong> Kennen Sie schon den interaktiven Rundgang? Er zeigt Ihnen Schritt für Schritt alle Funktionen des Monitors. Klicken Sie hier, um ihn zu starten.';
            textDiv.addEventListener('click', function() {
                Chat.close();
                Chat._tutorialHintDismissed = true;
                if (typeof Tutorial !== 'undefined') Tutorial.start();
            });
        }

        var closeBtn = document.createElement('button');
        closeBtn.className = 'chat-tutorial-hint-close';
        closeBtn.title = 'Schließen';
        closeBtn.innerHTML = '&times;';
        closeBtn.addEventListener('click', function(e) {
            e.stopPropagation();
            hint.remove();
            Chat._tutorialHintDismissed = true;
        });
        hint.appendChild(textDiv);
        hint.appendChild(closeBtn);
        container.appendChild(hint);
    },

};