document.addEventListener('DOMContentLoaded', () => {
    // --- Mobile Menu Toggle ---
    const menuToggle = document.querySelector('.menu-toggle');
    const navLinks = document.querySelector('.nav-links');

    if (menuToggle && navLinks) {
        menuToggle.addEventListener('click', () => {
            navLinks.classList.toggle('mobile-open');
            const icon = menuToggle.querySelector('i');
            if (icon) {
                icon.classList.toggle('fa-bars');
                icon.classList.toggle('fa-xmark');
            }
        });
    }

    // --- Tablet Mockup Interactive Demo ---
    const captureBtn = document.getElementById('demo-capture-btn');
    const screenWelcome = document.getElementById('demo-screen-welcome');
    const screenCountdown = document.getElementById('demo-screen-countdown');
    const screenPreview = document.getElementById('demo-screen-preview');
    const timerDisplay = document.getElementById('demo-timer');
    const flashOverlay = document.getElementById('demo-flash');
    
    const btnPrint = document.getElementById('demo-btn-print');
    const btnReset = document.getElementById('demo-btn-reset');

    if (captureBtn && screenWelcome && screenCountdown && screenPreview && timerDisplay && flashOverlay) {
        captureBtn.addEventListener('click', () => {
            // Step 1: Switch screen to countdown
            screenWelcome.style.display = 'none';
            screenCountdown.style.display = 'flex';
            
            // Step 2: 3-second countdown countdown
            let timeLeft = 3;
            timerDisplay.textContent = timeLeft;
            
            const timerInterval = setInterval(() => {
                timeLeft--;
                if (timeLeft > 0) {
                    timerDisplay.textContent = timeLeft;
                } else {
                    clearInterval(timerInterval);
                    // Step 3: Trigger Camera Flash overlay
                    flashOverlay.classList.add('flash-active');
                    
                    setTimeout(() => {
                        flashOverlay.classList.remove('flash-active');
                        // Step 4: Transition to captured photo preview screen
                        screenCountdown.style.display = 'none';
                        screenPreview.style.display = 'flex';
                    }, 400);
                }
            }, 800);
        });
    }

    if (btnReset && screenWelcome && screenPreview) {
        btnReset.addEventListener('click', () => {
            screenPreview.style.display = 'none';
            screenWelcome.style.display = 'flex';
        });
    }

    // --- Accordion FAQ ---
    const accordionHeaders = document.querySelectorAll('.accordion-header');

    accordionHeaders.forEach(header => {
        header.addEventListener('click', () => {
            const item = header.parentElement;
            const isActive = item.classList.contains('active');

            // Close all items
            document.querySelectorAll('.accordion-item').forEach(i => {
                i.classList.remove('active');
                const content = i.querySelector('.accordion-content');
                if (content) content.style.maxHeight = null;
            });

            // Toggle active item
            if (!isActive) {
                item.classList.add('active');
                const content = item.querySelector('.accordion-content');
                if (content) {
                    content.style.maxHeight = content.scrollHeight + "px";
                }
            }
        });
    });

    // --- Feedback Hub Logic ---
    const feedbackForm = document.getElementById('feedback-form');
    const feedbackList = document.getElementById('feedback-list');
    const filterButtons = document.querySelectorAll('.filter-btn');

    let feedbackData = [];

    // Upvote storage track (local to session/device)
    let upvotedIds = JSON.parse(localStorage.getItem('schnappix_upvoted_ids')) || [];

    const saveUpvotesToLocal = () => {
        localStorage.setItem('schnappix_upvoted_ids', JSON.stringify(upvotedIds));
    };

    // Admin State
    let isAdmin = sessionStorage.getItem('schnappix_is_admin') === 'true';

    const loadFeedback = async () => {
        if (!feedbackList) return;
        try {
            const response = await fetch('feedback_backend.php?action=get');
            const result = await response.json();
            if (result.success) {
                feedbackData = result.data;
                renderFeedback(getActiveFilter());
            }
        } catch (error) {
            console.error('Error loading feedback:', error);
        }
    };

    const renderFeedback = (filter = 'all') => {
        if (!feedbackList) return;
        feedbackList.innerHTML = '';

        // Sort by upvotes descending
        const sortedData = [...feedbackData].sort((a, b) => b.upvotes - a.upvotes);

        sortedData.forEach(item => {
            if (filter !== 'all' && item.type !== filter) return;

            const isVoted = upvotedIds.includes(item.id);
            const card = document.createElement('div');
            card.className = 'feedback-item glass';
            
            let badgeIcon = '✨';
            let categoryLabel = 'Feature';
            if (item.type === 'bug') {
                badgeIcon = '🐛';
                categoryLabel = 'Bug';
            } else if (item.type === 'love') {
                badgeIcon = '💖';
                categoryLabel = 'Lob';
            }

            // Show admin actions if user is admin
            let adminActionsHtml = '';
            if (isAdmin) {
                adminActionsHtml = `
                    <div class="fb-admin-actions" style="margin-top: 10px; margin-bottom: 15px; display: flex; gap: 10px;">
                        <button class="fb-admin-answer-btn btn btn-secondary" style="padding: 5px 10px; font-size: 12px;" data-id="${item.id}" title="Antworten"><i class="fa-solid fa-reply"></i> Antworten</button>
                        <button class="fb-admin-delete-btn btn" style="padding: 5px 10px; font-size: 12px; background: rgba(255,50,50,0.2); color: #ff6b6b;" data-id="${item.id}" title="Eintrag löschen"><i class="fa-solid fa-trash"></i> Löschen</button>
                    </div>
                `;
            }

            let answerHtml = '';
            if (item.answer) {
                answerHtml = `
                    <div class="fb-answer" style="margin-top: 15px; padding: 12px; background: rgba(var(--accent-color-rgb), 0.1); border-left: 3px solid var(--accent-color); border-radius: 4px;">
                        <div class="fb-answer-header" style="font-weight: bold; font-size: 13px; color: var(--accent-color); margin-bottom: 5px;"><i class="fa-solid fa-check-circle"></i> Offizielle Antwort</div>
                        <p style="margin: 0; font-size: 14px;">${escapeHtml(item.answer)}</p>
                    </div>
                `;
            }

            card.innerHTML = `
                <div class="fb-card-content">
                    <div class="fb-meta">
                        <span class="fb-tag ${item.type}">${badgeIcon} ${categoryLabel}</span>
                        <span class="fb-author">von ${escapeHtml(item.author)}</span>
                    </div>
                    ${adminActionsHtml}
                    <h4>${escapeHtml(item.title)}</h4>
                    <p>${escapeHtml(item.text)}</p>
                    ${answerHtml}
                </div>
                <div class="fb-upvote-section">
                    <button class="upvote-btn ${isVoted ? 'voted' : ''}" data-id="${item.id}" aria-label="Abstimmen">
                        <i class="fa-solid fa-caret-up"></i>
                        <span>${item.upvotes}</span>
                    </button>
                </div>
            `;

            feedbackList.appendChild(card);
        });

        setupUpvoteButtons();
        setupAdminDeleteButtons();
        setupAdminAnswerButtons();
    };

    const setupAdminDeleteButtons = () => {
        if (!isAdmin) return;
        const deleteButtons = document.querySelectorAll('.fb-admin-delete-btn');
        deleteButtons.forEach(btn => {
            btn.addEventListener('click', async () => {
                const id = btn.getAttribute('data-id');
                if (confirm('Möchten Sie diesen Eintrag wirklich permanent löschen?')) {
                    try {
                        const response = await fetch('feedback_backend.php', {
                            method: 'POST',
                            headers: { 'Content-Type': 'application/json' },
                            body: JSON.stringify({ action: 'delete', id: id, secret: sessionStorage.getItem('schnappix_admin_secret') || '' })
                        });
                        const result = await response.json();
                        if (result.success) {
                            loadFeedback();
                        } else {
                            alert('Fehler beim Löschen.');
                        }
                    } catch (e) {
                        console.error(e);
                    }
                }
            });
        });
    };

    const setupAdminAnswerButtons = () => {
        if (!isAdmin) return;
        const answerButtons = document.querySelectorAll('.fb-admin-answer-btn');
        answerButtons.forEach(btn => {
            btn.addEventListener('click', () => {
                const id = btn.getAttribute('data-id');
                const item = feedbackData.find(i => i.id === id);
                const currentAnswer = item ? (item.answer || '') : '';
                
                const answer = prompt('Antwort für das Feedback (leer lassen zum Löschen der Antwort):', currentAnswer);
                if (answer !== null) {
                    submitAnswer(id, answer);
                }
            });
        });
    };

    const submitAnswer = async (id, answer) => {
        try {
            const response = await fetch('feedback_backend.php', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ action: 'answer', id: id, answer: answer, secret: sessionStorage.getItem('schnappix_admin_secret') || '' })
            });
            const result = await response.json();
            if (result.success) {
                loadFeedback();
            } else {
                alert('Fehler beim Speichern der Antwort.');
            }
        } catch (e) {
            console.error(e);
        }
    };

    const escapeHtml = (str) => {
        if (!str) return '';
        return String(str).replace(/&/g, "&amp;")
                  .replace(/</g, "&lt;")
                  .replace(/>/g, "&gt;")
                  .replace(/"/g, "&quot;")
                  .replace(/'/g, "&#039;");
    };

    const setupUpvoteButtons = () => {
        const buttons = document.querySelectorAll('.upvote-btn');
        buttons.forEach(btn => {
            btn.addEventListener('click', async () => {
                const id = btn.getAttribute('data-id');
                const isVoted = upvotedIds.includes(id);

                // Optimistic UI update
                const btnSpan = btn.querySelector('span');
                let currentVotes = parseInt(btnSpan.textContent);
                
                if (isVoted) {
                    btn.classList.remove('voted');
                    btnSpan.textContent = currentVotes - 1;
                    upvotedIds = upvotedIds.filter(vId => vId !== id);
                } else {
                    btn.classList.add('voted');
                    btnSpan.textContent = currentVotes + 1;
                    upvotedIds.push(id);
                }
                saveUpvotesToLocal();

                try {
                    await fetch('feedback_backend.php', {
                        method: 'POST',
                        headers: { 'Content-Type': 'application/json' },
                        body: JSON.stringify({ action: 'upvote', id: id, undo: isVoted })
                    });
                } catch (e) {
                    console.error('Error upvoting', e);
                }
            });
        });
    };

    const getActiveFilter = () => {
        const activeBtn = document.querySelector('.filter-btn.active');
        return activeBtn ? activeBtn.getAttribute('data-filter') : 'all';
    };

    // Filter switching
    filterButtons.forEach(btn => {
        btn.addEventListener('click', () => {
            filterButtons.forEach(b => b.classList.remove('active'));
            btn.classList.add('active');
            renderFeedback(btn.getAttribute('data-filter'));
        });
    });

    // Form Submission
    if (feedbackForm) {
        feedbackForm.addEventListener('submit', async (e) => {
            e.preventDefault();

            const authorInput = document.getElementById('fb-author');
            const typeSelect = document.getElementById('fb-type');
            const titleInput = document.getElementById('fb-title');
            const textInput = document.getElementById('fb-text');
            const submitBtn = feedbackForm.querySelector('button[type="submit"]');

            const newFb = {
                action: 'add',
                author: authorInput.value,
                type: typeSelect.value,
                title: titleInput.value,
                text: textInput.value
            };

            submitBtn.disabled = true;
            submitBtn.textContent = 'Wird gesendet...';

            try {
                const response = await fetch('feedback_backend.php', {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify(newFb)
                });
                const result = await response.json();
                
                if (result.success) {
                    // Auto-upvote own post
                    upvotedIds.push(result.data.id);
                    saveUpvotesToLocal();
                    
                    feedbackForm.reset();
                    await loadFeedback(); // Reload the list
                    
                    feedbackList.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
                } else {
                    alert('Fehler beim Senden des Feedbacks.');
                }
            } catch (error) {
                console.error(error);
                alert('Netzwerkfehler. Bitte später erneut versuchen.');
            } finally {
                submitBtn.disabled = false;
                submitBtn.textContent = 'Absenden';
            }
        });
    }

    // --- Tester Registration Logic ---
    const testerForm = document.getElementById('tester-form');
    if (testerForm) {
        testerForm.addEventListener('submit', async (e) => {
            e.preventDefault();
            
            const emailInput = document.getElementById('tester-email');
            const submitBtn = document.getElementById('tester-submit-btn');
            const successMsg = document.getElementById('tester-success-msg');
            const errorMsg = document.getElementById('tester-error-msg');
            
            submitBtn.disabled = true;
            submitBtn.textContent = 'Wird gesendet...';
            successMsg.style.display = 'none';
            errorMsg.style.display = 'none';
            
            try {
                const response = await fetch('tester_backend.php', {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify({ email: emailInput.value })
                });
                
                const result = await response.json();
                
                if (result.success) {
                    successMsg.style.display = 'block';
                    testerForm.reset();
                } else {
                    errorMsg.innerHTML = '<i class="fa-solid fa-triangle-exclamation"></i> ' + (result.error || 'Unbekannter Fehler');
                    errorMsg.style.display = 'block';
                }
            } catch (err) {
                console.error(err);
                errorMsg.innerHTML = '<i class="fa-solid fa-triangle-exclamation"></i> Netzwerkfehler. Bitte später erneut versuchen.';
                errorMsg.style.display = 'block';
            } finally {
                submitBtn.disabled = false;
                submitBtn.textContent = 'Als Tester anmelden';
            }
        });
    }

    // --- Modal Management for Impressum & Privacy ---
    const modalTriggers = document.querySelectorAll('.legal-trigger');
    const modals = document.querySelectorAll('.modal-overlay');
    const closeButtons = document.querySelectorAll('.modal-close');

    // --- Modal close helpers for admin modals ---
    const closeModal = (modal) => {
        modal.classList.remove('open');
        document.body.style.overflow = '';
    };

    closeButtons.forEach(btn => {
        btn.addEventListener('click', () => {
            const modal = btn.closest('.modal-overlay');
            if (modal) closeModal(modal);
        });
    });

    modals.forEach(modal => {
        modal.addEventListener('click', (e) => {
            if (e.target === modal) {
                closeModal(modal);
            }
        });
    });

    window.addEventListener('keydown', (e) => {
        if (e.key === 'Escape') {
            modals.forEach(modal => {
                if (modal.classList.contains('open')) closeModal(modal);
            });
        }
    });

    // --- Admin Panel Modals & Operations ---
    const adminTrigger = document.getElementById('admin-login-trigger');
    const adminLoginModal = document.getElementById('admin-login-modal');
    const adminPanelModal = document.getElementById('admin-panel-modal');
    const adminLoginForm = document.getElementById('admin-login-form');
    const adminPasswordInput = document.getElementById('admin-password');
    const adminLoginError = document.getElementById('admin-login-error');
    
    const adminLogoutBtn = document.getElementById('admin-logout-btn');
    const adminExportBtn = document.getElementById('admin-export-btn');
    const exportContainer = document.getElementById('export-container');
    const exportTextarea = document.getElementById('export-textarea');

    if (adminTrigger) {
        adminTrigger.addEventListener('click', (e) => {
            e.preventDefault();
            if (isAdmin) {
                adminPanelModal.classList.add('open');
            } else {
                adminLoginModal.classList.add('open');
                adminPasswordInput.focus();
            }
            document.body.style.overflow = 'hidden';
        });
    }

    if (adminLoginForm) {
        adminLoginForm.addEventListener('submit', async (e) => {
            e.preventDefault();
            const password = adminPasswordInput.value;
            
            try {
                const response = await fetch('feedback_backend.php', {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify({ action: 'verify_password', secret: password })
                });
                
                if (response.ok) {
                    isAdmin = true;
                    sessionStorage.setItem('schnappix_is_admin', 'true');
                    sessionStorage.setItem('schnappix_admin_secret', password);
                    adminPasswordInput.value = '';
                    adminLoginError.style.display = 'none';
                    
                    // Switch Modals
                    adminLoginModal.classList.remove('open');
                    adminPanelModal.classList.add('open');
                    
                    // Re-render to show trash cans
                    renderFeedback(getActiveFilter());
                } else {
                    adminLoginError.style.display = 'block';
                    adminPasswordInput.value = '';
                }
            } catch (err) {
                console.error(err);
                adminLoginError.style.display = 'block';
            }
        });
    }

    if (adminLogoutBtn) {
        adminLogoutBtn.addEventListener('click', () => {
            isAdmin = false;
            sessionStorage.removeItem('schnappix_is_admin');
            adminPanelModal.classList.remove('open');
            document.body.style.overflow = '';
            
            // Hide export code if visible
            if (exportContainer) exportContainer.style.display = 'none';

            // Re-render to hide trash cans
            renderFeedback(getActiveFilter());
        });
    }

    if (adminExportBtn && exportContainer && exportTextarea) {
        adminExportBtn.addEventListener('click', () => {
            // Strip out own custom elements or internal helper flags if necessary
            const cleanFeedback = feedbackData.map(item => ({
                id: item.id,
                author: item.author,
                type: item.type,
                title: item.title,
                text: item.text,
                upvotes: item.upvotes,
                voted: false
            }));

            exportTextarea.value = JSON.stringify(cleanFeedback, null, 4);
            exportContainer.style.display = 'block';
            exportTextarea.select();
        });
    }

    // Modal Close overrides to reset error states
    const allCloseButtons = document.querySelectorAll('.modal-close');
    allCloseButtons.forEach(btn => {
        btn.addEventListener('click', () => {
            if (adminLoginError) adminLoginError.style.display = 'none';
            if (exportContainer) exportContainer.style.display = 'none';
        });
    });

    // Initial render
    if (feedbackList) {
        loadFeedback();
    }
});