import { fetchRecommendations, fetchChatResponse } from './api.js';

let mapInstance = null;

// ── Toast notification (replaces alert()) ──
function showToast(msg, type = 'info') {
    const t = document.createElement('div');
    t.textContent = msg;
    t.style.cssText = `
        position:fixed; bottom:24px; left:50%; transform:translateX(-50%);
        background:rgba(10,16,32,0.95); border:1px solid rgba(212,175,55,0.4);
        color:#f4f1ea; font-family:'Tajawal',sans-serif; font-size:14px;
        padding:12px 24px; border-radius:12px; z-index:9999;
        box-shadow:0 8px 24px rgba(0,0,0,0.5); pointer-events:none;
        animation:fadeInUp 0.3s ease;
    `;
    if (type === 'error') t.style.borderColor = 'rgba(255,75,75,0.5)';
    document.body.appendChild(t);
    setTimeout(() => t.remove(), 3500);
}

// ── Sanitize text before inserting into DOM ──
function escapeHtml(str) {
    return String(str)
        .replace(/&/g, '&')
        .replace(/</g, '&lt;')
        .replace(/>/g, '&gt;')
        .replace(/"/g, '&quot;')
        .replace(/'/g, '&#39;');
}

// ── Append a chat bubble safely ──
function appendMsg(container, role, html) {
    const isBot = role === 'bot';
    container.insertAdjacentHTML('beforeend', `
        <div class="chat-msg ${isBot ? 'bot-msg' : 'user-msg'}">
            <div class="avatar-ic"><i class="fa-solid fa-${isBot ? 'robot' : 'user'}"></i></div>
            <div class="msg-bubble">${html}</div>
        </div>`);
    container.scrollTop = container.scrollHeight;
}

document.addEventListener('DOMContentLoaded', () => {
    // ==========================================
    // 3D Background Initialization
    // ==========================================
    const init3DBackground = () => {
        const canvas = document.getElementById('bg-canvas');
        if (!canvas || typeof THREE === 'undefined') return;

        const scene = new THREE.Scene();
        // Fog to blend particles smoothly into the dark background
        scene.fog = new THREE.FogExp2(0x05070d, 0.0015);

        const camera = new THREE.PerspectiveCamera(75, window.innerWidth / window.innerHeight, 0.1, 1000);
        camera.position.z = 400;

        const renderer = new THREE.WebGLRenderer({ canvas: canvas, alpha: true, antialias: true });
        renderer.setSize(window.innerWidth, window.innerHeight);
        renderer.setPixelRatio(window.devicePixelRatio);

        // Create Particles for Network
        const particleCount = 120;
        const geometry = new THREE.BufferGeometry();
        const positions = new Float32Array(particleCount * 3);
        const velocities = [];

        for(let i=0; i<particleCount; i++) {
            positions[i*3] = (Math.random() - 0.5) * 800;
            positions[i*3+1] = (Math.random() - 0.5) * 800;
            positions[i*3+2] = (Math.random() - 0.5) * 800;

            velocities.push({
                x: (Math.random() - 0.5) * 0.5,
                y: (Math.random() - 0.5) * 0.5,
                z: (Math.random() - 0.5) * 0.5
            });
        }

        geometry.setAttribute('position', new THREE.BufferAttribute(positions, 3));

        const material = new THREE.PointsMaterial({
            color: 0xd4af37,
            size: 3,
            transparent: true,
            opacity: 0.8,
            blending: THREE.AdditiveBlending
        });

        const particleSystem = new THREE.Points(geometry, material);
        scene.add(particleSystem);

        // Lines for Network
        const lineMaterial = new THREE.LineBasicMaterial({
            color: 0xd4af37,
            transparent: true,
            opacity: 0.15,
            blending: THREE.AdditiveBlending
        });
        const lineGeometry = new THREE.BufferGeometry();
        const linePositions = new Float32Array(particleCount * particleCount * 3);
        lineGeometry.setAttribute('position', new THREE.BufferAttribute(linePositions, 3));
        const linesMesh = new THREE.LineSegments(lineGeometry, lineMaterial);
        scene.add(linesMesh);

        // Mouse interaction
        let mouseX = 0;
        let mouseY = 0;
        document.addEventListener('mousemove', (event) => {
            mouseX = (event.clientX - window.innerWidth / 2) * 0.1;
            mouseY = (event.clientY - window.innerHeight / 2) * 0.1;
        });

        // Animation Loop
        const animate = () => {
            requestAnimationFrame(animate);
            
            // Move particles
            const positionsAttr = geometry.attributes.position.array;
            let lineIndex = 0;

            for(let i=0; i<particleCount; i++) {
                positionsAttr[i*3] += velocities[i].x;
                positionsAttr[i*3+1] += velocities[i].y;
                positionsAttr[i*3+2] += velocities[i].z;

                // Bounce off imaginary bounds
                if (Math.abs(positionsAttr[i*3]) > 400) velocities[i].x *= -1;
                if (Math.abs(positionsAttr[i*3+1]) > 400) velocities[i].y *= -1;
                if (Math.abs(positionsAttr[i*3+2]) > 400) velocities[i].z *= -1;

                // Draw lines to close neighbors
                for(let j=i+1; j<particleCount; j++) {
                    const dx = positionsAttr[i*3] - positionsAttr[j*3];
                    const dy = positionsAttr[i*3+1] - positionsAttr[j*3+1];
                    const dz = positionsAttr[i*3+2] - positionsAttr[j*3+2];
                    const distSq = dx*dx + dy*dy + dz*dz;

                    if(distSq < 15000) {
                        linePositions[lineIndex++] = positionsAttr[i*3];
                        linePositions[lineIndex++] = positionsAttr[i*3+1];
                        linePositions[lineIndex++] = positionsAttr[i*3+2];
                        linePositions[lineIndex++] = positionsAttr[j*3];
                        linePositions[lineIndex++] = positionsAttr[j*3+1];
                        linePositions[lineIndex++] = positionsAttr[j*3+2];
                    }
                }
            }
            
            geometry.attributes.position.needsUpdate = true;
            linesMesh.geometry.setDrawRange(0, lineIndex / 3);
            linesMesh.geometry.attributes.position.needsUpdate = true;

            // Camera reacts to mouse
            camera.position.x += (mouseX - camera.position.x) * 0.05;
            camera.position.y += (-mouseY - camera.position.y) * 0.05;
            camera.lookAt(scene.position);

            renderer.render(scene, camera);
        };
        animate();

        // Handle Resize
        window.addEventListener('resize', () => {
            camera.aspect = window.innerWidth / window.innerHeight;
            camera.updateProjectionMatrix();
            renderer.setSize(window.innerWidth, window.innerHeight);
        });
    };
    init3DBackground();

    // 1. Intersection Observer for Reveal Animations
    const revealObserver = new IntersectionObserver((entries) => {
        entries.forEach(entry => {
            if (entry.isIntersecting) {
                entry.target.classList.add('active');
            }
        });
    }, { threshold: 0.1 });
    
    document.querySelectorAll('.reveal').forEach(el => revealObserver.observe(el));

    // Interactive Heart Buttons Helper
    const bindHeartButtons = () => {
        document.querySelectorAll('.heart-btn').forEach(btn => {
            btn.addEventListener('click', (e) => {
                const targetBtn = e.currentTarget;
                targetBtn.classList.toggle('active');
                const icon = targetBtn.querySelector('i');
                if (targetBtn.classList.contains('active')) {
                    icon.classList.remove('fa-regular');
                    icon.classList.add('fa-solid');
                } else {
                    icon.classList.remove('fa-solid');
                    icon.classList.add('fa-regular');
                }
            });
        });
    };
    
    // ==========================================
    // Hero Search Bar Logic
    // ==========================================
    const searchBtn = document.querySelector('.search-btn');
    const searchInput = document.getElementById('searchInput');
    const micBtn = document.querySelector('.mic-btn');

    // Chip quick-search
    document.querySelectorAll('.chip[data-q]').forEach(chip => {
        chip.addEventListener('click', () => executeSearch(chip.dataset.q));
    });

    // Clear chat
    const clearChatBtn = document.getElementById('clearChatBtn');
    if (clearChatBtn) {
        clearChatBtn.addEventListener('click', () => {
            const history = document.getElementById('inline-chat-history');
            if (history) {
                history.innerHTML = `<div class="chat-msg bot-msg"><div class="avatar-ic"><i class="fa-solid fa-robot"></i></div><div class="msg-bubble">مرحباً! أنا مستشارك العقاري الذكي. كيف يمكنني مساعدتك اليوم؟</div></div>`;
                inlineChatContext = [];
            }
        });
    }

    const executeSearch = async (queryText) => {
        if (!queryText) return;
        const inlineInput = document.getElementById('inline-chat-input');
        const inlineSendBtn = document.getElementById('inline-send-btn');
        if (inlineInput && inlineSendBtn) {
            inlineInput.value = queryText;
            inlineSendBtn.click();
        }
        // Fix #2: clear the top search bar after dispatching
        if (searchInput) searchInput.value = '';
    };

    if (searchBtn && searchInput) {
        searchBtn.addEventListener('click', () => {
            executeSearch(searchInput.value.trim());
        });

        searchInput.addEventListener('keydown', (e) => {
            if (e.key === 'Enter') {
                executeSearch(searchInput.value.trim());
            }
        });
    }

    if (micBtn && searchInput && searchBtn) {
        micBtn.addEventListener('click', () => {
            const SpeechRecognition = window.SpeechRecognition || window.webkitSpeechRecognition;
            if (SpeechRecognition) {
                const recognition = new SpeechRecognition();
                recognition.lang = 'ar-EG'; 
                
                recognition.onstart = () => {
                    micBtn.style.color = 'var(--gold-bright)';
                    searchInput.placeholder = 'جاري الاستماع...';
                };
                
                recognition.onresult = (event) => {
                    const transcript = event.results[0][0].transcript;
                    searchInput.value = transcript;
                    executeSearch(transcript);
                };
                
                recognition.onend = () => {
                    micBtn.style.color = ''; 
                    searchInput.placeholder = 'اسأل عن عقار، منطقة، استثمار...';
                };
                
                recognition.start();
            } else {
                showToast('عذراً، متصفحك لا يدعم البحث الصوتي', 'error');
            }
        });
    }

    // ==========================================
    // Inline Chat Logic
    // ==========================================
    const inlineChatContainer = document.getElementById('inline-chat-container');
    const inlineInput = document.getElementById('inline-chat-input');
    const inlineSendBtn = document.getElementById('inline-send-btn');
    const inlineChatHistory = document.getElementById('inline-chat-history');
    let inlineChatContext = [];

    // Chat mic button
    const chatMicBtn = document.getElementById('chatMicBtn');
    if (chatMicBtn && inlineInput) {
        chatMicBtn.addEventListener('click', () => {
            const SpeechRecognition = window.SpeechRecognition || window.webkitSpeechRecognition;
            if (!SpeechRecognition) { showToast('متصفحك لا يدعم الإدخال الصوتي', 'error'); return; }
            const recognition = new SpeechRecognition();
            recognition.lang = 'ar-EG';
            recognition.onstart = () => { chatMicBtn.style.color = 'var(--gold-bright)'; chatMicBtn.querySelector('i').className = 'fa-solid fa-circle-stop'; };
            recognition.onresult = (e) => { inlineInput.value = e.results[0][0].transcript; inlineSendBtn.click(); };
            recognition.onend = () => { chatMicBtn.style.color = ''; chatMicBtn.querySelector('i').className = 'fa-solid fa-microphone'; };
            recognition.start();
        });
    }

    if (inlineChatContainer) {
        // Send Message
        if (inlineSendBtn && inlineInput && inlineChatHistory) {
            inlineSendBtn.addEventListener('click', async () => {
                const msg = inlineInput.value.trim().slice(0, 1000); // Fix #5: 1000 char limit
                if (!msg) return;

                // Disable send button while waiting
                inlineSendBtn.disabled = true;
                inlineSendBtn.innerHTML = '<i class="fa-solid fa-spinner fa-spin"></i>';

                appendMsg(inlineChatHistory, 'user', escapeHtml(msg));
                inlineInput.value = '';

                const typingId = 'typing-' + Date.now();
                inlineChatHistory.insertAdjacentHTML('beforeend', `
                    <div id="${typingId}" class="chat-msg bot-msg">
                        <div class="avatar-ic"><i class="fa-solid fa-robot"></i></div>
                        <div class="msg-bubble"><div class="typing-indicator"><span></span><span></span><span></span></div></div>
                    </div>`);
                inlineChatHistory.scrollTop = inlineChatHistory.scrollHeight;

                try {
                    const reply = await fetchChatResponse(msg, inlineChatContext);
                    document.getElementById(typingId)?.remove();
                    // Escape reply but allow line breaks
                    appendMsg(inlineChatHistory, 'bot', escapeHtml(reply).replace(/\n/g, '<br>'));
                    // Speak the reply aloud
                    if (window.speechSynthesis) {
                        const utt = new SpeechSynthesisUtterance(reply);
                        utt.lang = 'ar-EG';
                        window.speechSynthesis.cancel();
                        window.speechSynthesis.speak(utt);
                    }

                    inlineChatContext.push({ role: 'user', content: msg });
                    inlineChatContext.push({ role: 'assistant', content: reply });
                    if (inlineChatContext.length > 10) inlineChatContext = inlineChatContext.slice(-10);
                } catch (err) {
                    document.getElementById(typingId)?.remove();
                    appendMsg(inlineChatHistory, 'bot', '<span style="color:#ff6b6b">عذراً، حدث خطأ أثناء الاتصال.</span>');
                } finally {
                    inlineSendBtn.disabled = false;
                    inlineSendBtn.innerHTML = '<i class="fa-solid fa-paper-plane"></i>';
                }
            });
            
            inlineInput.addEventListener('keydown', (e) => {
                if (e.key === 'Enter') {
                    inlineSendBtn.click();
                }
            });
        }
    }
    // ==========================================
    // Fix #1: Load real properties into right column
    // ==========================================
    const loadSuggestedProperties = async () => {
        const loading = document.getElementById('props-loading');
        const list    = document.getElementById('props-list');
        const empty   = document.getElementById('props-empty');
        if (!list) return;
        try {
            const res  = await fetch('/api/properties?limit=3');
            const data = await res.json();
            const props = data.properties || [];
            if (loading) loading.style.display = 'none';
            if (props.length === 0) { if (empty) empty.style.display = 'flex'; return; }
            list.innerHTML = props.map(p => `
                <div class="prop-card" onclick="window.location.href='explore.html'">
                    <div class="prop-img-wrap">
                        <img src="${escapeHtml(p.image || '')}" alt="${escapeHtml(p.title || '')}" loading="lazy">
                        <span class="prop-badge${p.status === 'للإيجار' ? ' rent' : ''}">${escapeHtml(p.status || 'للبيع')}</span>
                    </div>
                    <div class="prop-info">
                        <div class="prop-name">${escapeHtml(p.title || '')}</div>
                        <div class="prop-loc"><i class="fa-solid fa-location-dot"></i> ${escapeHtml(p.location || '')}</div>
                        <div class="prop-price">${escapeHtml(p.price || '')} <span>${p.status === 'للإيجار' ? 'ج.م / شهر' : 'ج.م'}</span></div>
                    </div>
                </div>`).join('');
        } catch {
            if (loading) loading.style.display = 'none';
            if (empty) empty.style.display = 'flex';
        }
    };
    loadSuggestedProperties();

    // ==========================================
    // Fix #4: Login modal keyboard trap + Escape
    // ==========================================
    const loginModal   = document.getElementById('loginModal');
    const openLoginBtn = document.getElementById('openLoginBtn');
    const closeLoginBtn = document.getElementById('closeLoginBtn');

    const openModal = () => {
        if (!loginModal) return;
        loginModal.style.display = 'flex';
        const focusable = loginModal.querySelectorAll('button, input, [tabindex]:not([tabindex="-1"])');
        if (focusable[0]) focusable[0].focus();
    };
    const closeModal = () => { if (loginModal) loginModal.style.display = 'none'; };

    if (openLoginBtn)  openLoginBtn.addEventListener('click', openModal);
    if (closeLoginBtn) closeLoginBtn.addEventListener('click', closeModal);

    // Escape key closes modal
    document.addEventListener('keydown', (e) => {
        if (e.key === 'Escape' && loginModal && loginModal.style.display !== 'none') closeModal();
    });

    // Trap Tab inside modal
    if (loginModal) {
        loginModal.addEventListener('keydown', (e) => {
            if (e.key !== 'Tab') return;
            const focusable = [...loginModal.querySelectorAll('button, input, [tabindex]:not([tabindex="-1"])')].filter(el => !el.disabled);
            if (!focusable.length) return;
            const first = focusable[0], last = focusable[focusable.length - 1];
            if (e.shiftKey ? document.activeElement === first : document.activeElement === last) {
                e.preventDefault();
                (e.shiftKey ? last : first).focus();
            }
        });
        // Click outside closes modal
        loginModal.addEventListener('click', (e) => { if (e.target === loginModal) closeModal(); });
    }

    // Modal tab switching
    document.querySelectorAll('.modal-tab').forEach(tab => {
        tab.addEventListener('click', () => {
            document.querySelectorAll('.modal-tab').forEach(t => { t.classList.remove('active'); t.setAttribute('aria-selected','false'); });
            tab.classList.add('active'); tab.setAttribute('aria-selected','true');
            document.getElementById('loginForm').style.display   = tab.dataset.tab === 'login'    ? 'flex' : 'none';
            document.getElementById('registerForm').style.display = tab.dataset.tab === 'register' ? 'flex' : 'none';
        });
    });

    // ==========================================
    // Fix #7: Highlight active feature card
    // ==========================================
    const currentPage = window.location.pathname.split('/').pop() || 'index.html';
    document.querySelectorAll('.feat-card').forEach(card => {
        const href = card.getAttribute('href') || '';
        if (href && currentPage.includes(href.replace('.html',''))) {
            card.classList.add('feat-card-active');
        }
    });

    const assistantCard = document.getElementById('assistantSidebar');
    
    if (startChatBtn && assistantCard) {
        const defaultView = assistantCard.querySelector('.default-view');
        const chatView = assistantCard.querySelector('.chat-view');
        const chatHistory = assistantCard.querySelector('.chat-history');
        const chatInput = assistantCard.querySelector('.chat-input input');
        const sendMsgBtn = assistantCard.querySelector('.send-msg-btn');
        const closeBtn = assistantCard.querySelector('.close-chat-btn');
        const expandBtn = assistantCard.querySelector('.expand-chat-btn');
        
        let chatContext = [];
        
        const openChat = () => {
            if (assistantCard) {
                assistantCard.style.display = 'flex';
            }
            if (defaultView && chatView) {
                defaultView.style.display = 'none';
                chatView.style.display = 'flex';
            }
        };

        const closeChat = () => {
            if (defaultView && chatView) {
                chatView.style.display = 'none';
                defaultView.style.display = 'block';
            }
            if (window.innerWidth <= 1300 && assistantCard) {
                assistantCard.style.display = 'none';
            }
        };

        startChatBtn.addEventListener('click', () => openChat());
        if (closeBtn) closeBtn.addEventListener('click', closeChat);

        if (sendMsgBtn && chatInput && chatHistory) {
            sendMsgBtn.addEventListener('click', async () => {
                const msg = chatInput.value.trim();
                if(msg) {
                    // Add user message
                    chatHistory.innerHTML += `<div style="background:var(--gold); color:black; padding:8px; border-radius:10px; align-self:flex-end; max-width:80%;">${msg}</div>`;
                    chatInput.value = '';
                    chatHistory.scrollTop = chatHistory.scrollHeight;
                    
                    // Show typing indicator
                    const typingId = 'typing-' + Date.now();
                    chatHistory.innerHTML += `<div id="${typingId}" style="background:rgba(255,255,255,0.05); padding:10px 16px; border-radius:14px; align-self:flex-start; max-width:80%;"><div class="typing-indicator"><span></span><span></span><span></span></div></div>`;
                    chatHistory.scrollTop = chatHistory.scrollHeight;
                    
                    try {
                        // Call API
                        const reply = await fetchChatResponse(msg, chatContext);
                        
                        // Remove typing indicator and add response
                        const typingEl = document.getElementById(typingId);
                        if (typingEl) typingEl.remove();
                        
                        chatHistory.innerHTML += `<div style="background:rgba(255,255,255,0.1); padding:8px; border-radius:10px; align-self:flex-start; max-width:80%;">${reply.replace(/\n/g, '<br>')}</div>`;
                        chatHistory.scrollTop = chatHistory.scrollHeight;
                        
                        // Update context history (keep last 5 interactions)
                        chatContext.push({"role": "user", "content": msg});
                        chatContext.push({"role": "assistant", "content": reply});
                        if (chatContext.length > 10) chatContext = chatContext.slice(chatContext.length - 10);
                    } catch(err) {
                        const typingEl = document.getElementById(typingId);
                        if (typingEl) typingEl.remove();
                        chatHistory.innerHTML += `<div style="background:rgba(255,0,0,0.2); padding:8px; border-radius:10px; align-self:flex-start; max-width:80%;">عذراً، حدث خطأ.</div>`;
                    }
                }
            });
            
            // Allow sending with Enter key
            chatInput.addEventListener('keydown', (e) => {
                if (e.key === 'Enter') {
                    sendMsgBtn.click();
                }
            });
        }
    }
});