/* NCAkit - Main JavaScript */

// ============================================
// 🔐 LOGIN CREDENTIALS (Easy to find if forgotten!)
// ============================================
const AUTH_CONFIG = {
    username: "robiul",
    password: "Robi1234",
    storageKey: "ncakit_logged_in"
};

// ============================================
// AUTHENTICATION FUNCTIONS
// ============================================
function checkAuth() {
    return localStorage.getItem(AUTH_CONFIG.storageKey) === "true";
}

function showApp() {
    document.getElementById('loginOverlay').classList.add('hidden');
    document.getElementById('mainApp').classList.remove('hidden');
}

function showLogin() {
    document.getElementById('loginOverlay').classList.remove('hidden');
    document.getElementById('mainApp').classList.add('hidden');
}

function handleLogin(e) {
    e.preventDefault();
    const username = document.getElementById('loginUsername').value.trim();
    const password = document.getElementById('loginPassword').value;
    const errorEl = document.getElementById('loginError');

    // Debug logging
    console.log('Login attempt:', { username, passwordLength: password.length });
    console.log('Expected:', { username: AUTH_CONFIG.username, password: AUTH_CONFIG.password });

    if (username === AUTH_CONFIG.username && password === AUTH_CONFIG.password) {
        console.log('Login SUCCESS!');
        localStorage.setItem(AUTH_CONFIG.storageKey, "true");
        errorEl.classList.add('hidden');
        showApp();
    } else {
        console.log('Login FAILED - credentials mismatch');
        errorEl.textContent = "❌ Incorrect username or password";
        errorEl.classList.remove('hidden');
    }
}

function handleLogout() {
    localStorage.removeItem(AUTH_CONFIG.storageKey);
    showLogin();
    // Clear form
    document.getElementById('loginUsername').value = '';
    document.getElementById('loginPassword').value = '';
}

// Wait for DOM to be ready
document.addEventListener('DOMContentLoaded', function () {

    // ============================================
    // AUTHENTICATION CHECK ON PAGE LOAD
    // ============================================
    if (checkAuth()) {
        showApp();
    } else {
        showLogin();
    }

    // Login form handler
    document.getElementById('loginForm').addEventListener('submit', handleLogin);

    // Logout button handler
    document.getElementById('logoutBtn').addEventListener('click', handleLogout);

    // ============================================
    // TAB SWITCHING
    // ============================================
    document.querySelectorAll('.tab-btn').forEach(btn => {
        btn.addEventListener('click', () => {
            document.querySelectorAll('.tab-btn').forEach(b => b.classList.remove('active'));
            document.querySelectorAll('.tab-content').forEach(c => c.classList.remove('active'));
            btn.classList.add('active');
            document.getElementById(btn.dataset.tab + '-tab').classList.add('active');
        });
    });

    // ============================================
    // STORY REELS MODULE
    // ============================================
    document.getElementById('storyForm').addEventListener('submit', async (e) => {
        e.preventDefault();
        const status = document.getElementById('storyStatus');
        status.className = 'status processing';
        status.innerHTML = '⏳ Starting generation...';
        status.classList.remove('hidden');

        const data = {
            script: document.getElementById('storyScript').value,
            image_style: document.getElementById('storyStyle').value,
            voice: document.getElementById('storyVoice').value
        };

        try {
            const res = await fetch('/api/story/story-reel', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify(data)
            });
            const result = await res.json();

            if (result.job_id) {
                status.innerHTML = `✅ Job started! ID: ${result.job_id}<br>Checking status...`;
                pollStatus(result.job_id, 'story');
            }
        } catch (err) {
            status.className = 'status error';
            status.innerHTML = '❌ Error: ' + err.message;
        }
    });

    // Generic poll status for story/video
    async function pollStatus(jobId, type) {
        const status = document.getElementById(type + 'Status');
        const endpoint = type === 'story' ? '/api/story/story-reel/' : '/api/video/short-video/';

        const check = async () => {
            try {
                const res = await fetch(endpoint + jobId + '/status');
                const data = await res.json();

                const progress = data.progress || 0;
                status.innerHTML = `
                    <div>Status: <strong>${data.status}</strong></div>
                    <div class="progress-bar"><div class="progress-fill" style="width: ${progress}%"></div></div>
                `;

                if (data.status === 'ready') {
                    status.className = 'status success';
                    const downloadUrl = type === 'story' ? `/api/story/story-reel/${jobId}` : `/api/video/short-video/${jobId}`;
                    status.innerHTML += `<br><a href="${downloadUrl}" class="btn btn-primary" style="margin-top: 1rem; display: inline-block;">📥 Download Video</a>`;
                } else if (data.status === 'failed') {
                    status.className = 'status error';
                    status.innerHTML = '❌ Failed: ' + (data.error || 'Unknown error');
                } else {
                    setTimeout(check, 2000);
                }
            } catch (err) {
                setTimeout(check, 3000);
            }
        };
        check();
    }

    // ============================================
    // VIDEO CREATOR MODULE
    // ============================================

    // Add scene
    document.getElementById('addScene').addEventListener('click', () => {
        const container = document.getElementById('scenesContainer');
        const count = container.querySelectorAll('.scene-text').length + 1;
        container.innerHTML += `
            <div class="form-group">
                <label>Scene ${count} - Text</label>
                <textarea class="scene-text" rows="2" placeholder="Enter narration..." required></textarea>
            </div>
            <div class="form-group">
                <label>Keywords</label>
                <input type="text" class="scene-keywords" placeholder="nature, forest">
            </div>
        `;
    });

    // Video Form
    document.getElementById('videoForm').addEventListener('submit', async (e) => {
        e.preventDefault();
        const status = document.getElementById('videoStatus');
        status.className = 'status processing';
        status.innerHTML = '⏳ Creating video...';
        status.classList.remove('hidden');

        const scenes = [];
        document.querySelectorAll('.scene-text').forEach((textarea, i) => {
            const keywords = document.querySelectorAll('.scene-keywords')[i]?.value || '';
            scenes.push({
                text: textarea.value,
                searchTerms: keywords.split(',').map(k => k.trim()).filter(k => k)
            });
        });

        const data = {
            scenes: scenes,
            config: {
                voice: document.getElementById('videoVoice').value,
                music: document.getElementById('videoMusic').value || null
            }
        };

        try {
            const res = await fetch('/api/video/short-video', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify(data)
            });
            const result = await res.json();

            if (result.videoId) {
                status.innerHTML = `✅ Video started! ID: ${result.videoId}`;
                pollStatus(result.videoId, 'video');
            }
        } catch (err) {
            status.className = 'status error';
            status.innerHTML = '❌ Error: ' + err.message;
        }
    });

    // ============================================
    // FACT IMAGE MODULE
    // ============================================
    document.getElementById('factForm').addEventListener('submit', async (e) => {
        e.preventDefault();
        const status = document.getElementById('factStatus');
        status.className = 'status processing';
        status.innerHTML = '⏳ Generating fact video...';
        status.classList.remove('hidden');

        const heading = document.getElementById('factHeading').value.trim();

        const data = {
            model: document.getElementById('factModel').value,
            image_prompt: document.getElementById('factImagePrompt').value,
            fact_text: document.getElementById('factText').value,
            duration: parseInt(document.getElementById('factDuration').value)
        };

        if (heading) {
            data.fact_heading = heading;
            data.heading_background = {
                enabled: true,
                color: document.getElementById('headingBgColor').value,
                padding: 22,
                corner_radius: parseInt(document.getElementById('headingBgRadius').value)
            };
        }

        try {
            const res = await fetch('/api/fact-image/', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify(data)
            });
            const result = await res.json();

            if (res.ok && result.job_id) {
                status.innerHTML = `✅ Job started! ID: ${result.job_id}<br>Checking status...`;
                pollFactStatus(result.job_id);
            } else {
                status.className = 'status error';
                // Show validation errors
                let errorMsg = result.detail || 'Unknown error';
                if (Array.isArray(result.detail)) {
                    errorMsg = result.detail.map(e => e.msg).join(', ');
                }
                status.innerHTML = '❌ Error: ' + errorMsg;
            }
        } catch (err) {
            status.className = 'status error';
            status.innerHTML = '❌ Error: ' + err.message;
        }
    });

    async function pollFactStatus(jobId) {
        const status = document.getElementById('factStatus');

        const check = async () => {
            try {
                const res = await fetch(`/api/fact-image/${jobId}/status`);
                const data = await res.json();

                const progress = data.progress || 0;
                status.innerHTML = `
                    <div>Status: <strong>${data.status}</strong></div>
                    <div class="progress-bar"><div class="progress-fill" style="width: ${progress}%"></div></div>
                `;

                if (data.status === 'ready') {
                    status.className = 'status success';
                    status.innerHTML += `<br><a href="/api/fact-image/${jobId}" class="btn btn-primary" style="margin-top: 1rem; display: inline-block;">📥 Download Video</a>`;
                } else if (data.status === 'failed') {
                    status.className = 'status error';
                    status.innerHTML = '❌ Failed: ' + (data.error || 'Unknown error');
                } else {
                    setTimeout(check, 2000);
                }
            } catch (err) {
                setTimeout(check, 3000);
            }
        };
        check();
    }

    // ============================================
    // TRENDS MODULE
    // ============================================
    document.getElementById('trendingForm').addEventListener('submit', async (e) => {
        e.preventDefault();
        const results = document.getElementById('trendingResults');
        results.innerHTML = '<p>⏳ Loading trends...</p>';

        const data = {
            country: document.getElementById('trendCountry').value,
            limit: parseInt(document.getElementById('trendLimit').value)
        };

        try {
            const res = await fetch('/api/trends/trending-now', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify(data)
            });
            const result = await res.json();

            if (result.success) {
                let html = '<div style="background: var(--bg-secondary); border-radius: 8px; padding: 1rem; max-height: 400px; overflow-y: auto;">';
                result.trends.forEach(t => {
                    html += `<div style="padding: 0.5rem 0; border-bottom: 1px solid var(--border);">
                        <span style="color: var(--accent); font-weight: bold;">#${t.rank}</span> ${t.topic}
                    </div>`;
                });
                html += '</div>';
                results.innerHTML = html;
            } else {
                results.innerHTML = '<p style="color: var(--error);">❌ Error: ' + (result.detail || 'Failed') + '</p>';
            }
        } catch (err) {
            results.innerHTML = '<p style="color: var(--error);">❌ Error: ' + err.message + '</p>';
        }
    });

    document.getElementById('keywordForm').addEventListener('submit', async (e) => {
        e.preventDefault();
        const results = document.getElementById('keywordResults');
        results.innerHTML = '<p>⏳ Analyzing keyword...</p>';

        const data = {
            keyword: document.getElementById('researchKeyword').value,
            region: document.getElementById('researchRegion').value,
            timeframe: document.getElementById('researchTimeframe').value,
            category: document.getElementById('researchCategory').value,
            search_type: document.getElementById('researchType').value
        };

        try {
            const res = await fetch('/api/trends/keyword-research', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify(data)
            });
            const result = await res.json();

            if (result.success) {
                let html = '<div style="display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;">';

                html += '<div style="background: var(--bg-secondary); border-radius: 8px; padding: 1rem;">';
                html += '<h4 style="margin-bottom: 0.5rem;">📌 Related Topics</h4>';
                if (result.related_topics.top && result.related_topics.top.length > 0) {
                    result.related_topics.top.slice(0, 10).forEach(t => {
                        html += `<div style="padding: 0.25rem 0; font-size: 0.9rem;">${t.topic} <span style="color: var(--text-secondary);">(${t.value})</span></div>`;
                    });
                } else {
                    html += '<p style="color: var(--text-secondary); font-size: 0.9rem;">No data</p>';
                }
                html += '</div>';

                html += '<div style="background: var(--bg-secondary); border-radius: 8px; padding: 1rem;">';
                html += '<h4 style="margin-bottom: 0.5rem;">🔍 Related Queries</h4>';
                if (result.related_queries.top && result.related_queries.top.length > 0) {
                    result.related_queries.top.slice(0, 10).forEach(q => {
                        html += `<div style="padding: 0.25rem 0; font-size: 0.9rem;">${q.query} <span style="color: var(--text-secondary);">(${q.value})</span></div>`;
                    });
                } else {
                    html += '<p style="color: var(--text-secondary); font-size: 0.9rem;">No data</p>';
                }
                html += '</div>';

                html += '</div>';
                results.innerHTML = html;
            } else {
                results.innerHTML = '<p style="color: var(--error);">❌ Error: ' + (result.detail || 'Failed') + '</p>';
            }
        } catch (err) {
            results.innerHTML = '<p style="color: var(--error);">❌ Error: ' + err.message + '</p>';
        }
    });

    // ============================================
    // QUIZ REEL MODULE
    // ============================================
    let quizCount = 1;

    document.getElementById('addQuizBtn').addEventListener('click', () => {
        quizCount++;
        const container = document.getElementById('quizContainer');
        const quizHtml = `
            <div class="quiz-item" style="background: var(--bg-secondary); padding: 1.5rem; border-radius: 12px; margin-bottom: 1rem;">
                <h4 style="color: var(--accent); margin-bottom: 1rem;">Quiz ${quizCount}</h4>
                <div class="form-group">
                    <label>Hook (Category)</label>
                    <input type="text" class="quiz-hook" placeholder="e.g., IQ TEST, MATH QUIZ">
                </div>
                <div class="form-group">
                    <label>Question *</label>
                    <input type="text" class="quiz-question" placeholder="Enter your question" required>
                </div>
                <div class="form-row">
                    <div class="form-group">
                        <label>Option A *</label>
                        <input type="text" class="quiz-option-a" placeholder="Answer A" required>
                    </div>
                    <div class="form-group">
                        <label>Option B *</label>
                        <input type="text" class="quiz-option-b" placeholder="Answer B" required>
                    </div>
                    <div class="form-group">
                        <label>Option C *</label>
                        <input type="text" class="quiz-option-c" placeholder="Answer C" required>
                    </div>
                </div>
                <div class="form-row">
                    <div class="form-group">
                        <label>Correct Answer *</label>
                        <select class="quiz-correct" required>
                            <option value="A">A</option>
                            <option value="B">B</option>
                            <option value="C">C</option>
                        </select>
                    </div>
                </div>
                <div class="form-group">
                    <label>Explain (shown after answer)</label>
                    <input type="text" class="quiz-explain" placeholder="Brief explanation">
                </div>
            </div>
        `;
        container.insertAdjacentHTML('beforeend', quizHtml);
    });

    document.getElementById('removeQuizBtn').addEventListener('click', () => {
        const container = document.getElementById('quizContainer');
        const items = container.querySelectorAll('.quiz-item');
        if (items.length > 1) {
            items[items.length - 1].remove();
            quizCount--;
        }
    });

    async function pollQuizStatus(jobId, statusDiv) {
        const checkStatus = async () => {
            try {
                const res = await fetch(`/api/quiz/${jobId}/status`);
                const status = await res.json();

                if (status.status === 'ready') {
                    statusDiv.className = 'status success';
                    statusDiv.innerHTML = `✅ Video Ready! <a href="${status.video_url}" target="_blank" style="color: var(--accent);">Download Video</a>`;
                    return;
                } else if (status.status === 'failed') {
                    statusDiv.className = 'status error';
                    statusDiv.innerHTML = `❌ Failed: ${status.error}`;
                    return;
                } else {
                    statusDiv.innerHTML = `⏳ ${status.status}... ${status.progress}%`;
                    setTimeout(checkStatus, 2000);
                }
            } catch (err) {
                statusDiv.className = 'status error';
                statusDiv.innerHTML = `❌ Error: ${err.message}`;
            }
        };
        checkStatus();
    }

    document.getElementById('quizForm').addEventListener('submit', async (e) => {
        e.preventDefault();
        const status = document.getElementById('quizStatus');
        status.className = 'status';
        status.classList.remove('hidden');
        status.innerHTML = '⏳ Starting quiz video generation...';

        const quizItems = document.querySelectorAll('.quiz-item');
        const quizzes = [];

        quizItems.forEach(item => {
            quizzes.push({
                hook: item.querySelector('.quiz-hook').value || '',
                question: item.querySelector('.quiz-question').value,
                options: {
                    A: item.querySelector('.quiz-option-a').value,
                    B: item.querySelector('.quiz-option-b').value,
                    C: item.querySelector('.quiz-option-c').value
                },
                correct: item.querySelector('.quiz-correct').value,
                explain: item.querySelector('.quiz-explain').value || ''
            });
        });

        const data = {
            quizzes: quizzes,
            voice: document.getElementById('quizVoice').value
        };

        try {
            const res = await fetch('/api/quiz/generate', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify(data)
            });
            const result = await res.json();

            if (result.job_id) {
                status.innerHTML = `⏳ Job started: ${result.job_id} (${quizzes.length} quizzes)`;
                pollQuizStatus(result.job_id, status);
            } else {
                status.className = 'status error';
                status.innerHTML = `❌ Error: ${result.detail || 'Failed to start'}`;
            }
        } catch (err) {
            status.className = 'status error';
            status.innerHTML = '❌ Error: ' + err.message;
        }
    });

    // ============================================
    // TEXT STORY MODULE
    // ============================================
    document.getElementById('tsAddMessage').addEventListener('click', () => {
        const container = document.getElementById('tsMessagesContainer');
        const count = container.querySelectorAll('.ts-message-item').length + 1;
        const html = `
            <div class="ts-message-item" style="background: var(--bg-secondary); padding: 1rem; border-radius: 8px; margin-bottom: 0.5rem;">
                <div class="form-row" style="align-items: flex-end;">
                    <div class="form-group" style="flex: 0 0 100px;">
                        <label>Sender</label>
                        <select class="ts-sender">
                            <option value="B">B (Other)</option>
                            <option value="A">A (You)</option>
                        </select>
                    </div>
                    <div class="form-group" style="flex: 1;">
                        <label>Message ${count}</label>
                        <input type="text" class="ts-text" placeholder="Type message..." required>
                    </div>
                    <button type="button" class="btn btn-secondary ts-remove" style="height: 42px;">✕</button>
                </div>
            </div>
        `;
        container.insertAdjacentHTML('beforeend', html);
    });

    document.getElementById('tsMessagesContainer').addEventListener('click', (e) => {
        if (e.target.classList.contains('ts-remove')) {
            const items = document.querySelectorAll('.ts-message-item');
            if (items.length > 1) {
                e.target.closest('.ts-message-item').remove();
            }
        }
    });

    // Toggle Manual/AI mode - make global
    window.toggleTsMode = function () {
        const mode = document.querySelector('input[name="tsMode"]:checked').value;
        document.getElementById('tsAiSection').style.display = mode === 'ai' ? 'block' : 'none';
        document.getElementById('tsManualSection').style.display = mode === 'manual' ? 'block' : 'none';
    };

    document.getElementById('textStoryForm').addEventListener('submit', async (e) => {
        e.preventDefault();
        const status = document.getElementById('textStoryStatus');
        status.className = 'status processing';
        status.classList.remove('hidden');

        const mode = document.querySelector('input[name="tsMode"]:checked').value;
        let messages = [];

        if (mode === 'ai') {
            const prompt = document.getElementById('tsAiPrompt').value.trim();
            if (!prompt) {
                status.className = 'status error';
                status.innerHTML = '❌ Please enter a prompt for AI!';
                return;
            }

            status.innerHTML = '🤖 AI generating conversation...';

            try {
                const aiRes = await fetch('/api/text-story/ai-generate', {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify({
                        prompt: prompt,
                        person_a_name: document.getElementById('tsPersonA').value || 'You',
                        person_b_name: document.getElementById('tsPersonB').value || 'My Ex',
                        message_count: parseInt(document.getElementById('tsAiMsgCount').value),
                        tone: document.getElementById('tsAiTone').value
                    })
                });
                const aiData = await aiRes.json();

                if (aiData.messages) {
                    messages = aiData.messages;
                    status.innerHTML = `🤖 Generated ${messages.length} messages. Now creating video...`;
                } else {
                    status.className = 'status error';
                    status.innerHTML = '❌ AI failed: ' + (aiData.detail || 'Unknown error');
                    return;
                }
            } catch (err) {
                status.className = 'status error';
                status.innerHTML = '❌ AI Error: ' + err.message;
                return;
            }
        } else {
            const messageItems = document.querySelectorAll('.ts-message-item');
            messageItems.forEach(item => {
                const sender = item.querySelector('.ts-sender').value;
                const text = item.querySelector('.ts-text').value.trim();
                if (text) {
                    messages.push({ sender, text });
                }
            });

            if (messages.length < 2) {
                status.className = 'status error';
                status.innerHTML = '❌ Need at least 2 messages!';
                return;
            }
        }

        status.innerHTML = '⏳ Starting video generation...';

        const data = {
            person_a_name: document.getElementById('tsPersonA').value || 'You',
            person_b_name: document.getElementById('tsPersonB').value || 'My Ex',
            person_b_avatar: document.getElementById('tsAvatar').value || null,
            messages: messages,
            ending_text: document.getElementById('tsEnding').value || null,
            voice_a: document.getElementById('tsVoiceA').value,
            voice_b: document.getElementById('tsVoiceB').value
        };

        try {
            const res = await fetch('/api/text-story/generate', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify(data)
            });
            const result = await res.json();

            if (result.job_id) {
                status.innerHTML = `⏳ Job started: ${result.job_id}`;
                pollTextStoryStatus(result.job_id);
            } else {
                status.className = 'status error';
                status.innerHTML = `❌ Error: ${result.detail || 'Failed to start'}`;
            }
        } catch (err) {
            status.className = 'status error';
            status.innerHTML = '❌ Error: ' + err.message;
        }
    });

    async function pollTextStoryStatus(jobId) {
        const status = document.getElementById('textStoryStatus');
        const poll = async () => {
            try {
                const res = await fetch(`/api/text-story/${jobId}/status`);
                const data = await res.json();

                if (data.status === 'ready') {
                    status.className = 'status success';
                    status.innerHTML = `✅ Video ready! <a href="${data.video_url}" target="_blank" class="btn btn-primary" style="margin-left: 1rem;">📥 Download</a>`;
                } else if (data.status === 'failed') {
                    status.className = 'status error';
                    status.innerHTML = '❌ Failed: ' + (data.error || 'Unknown error');
                } else {
                    const step = data.current_step || 'Processing';
                    status.innerHTML = `⏳ ${step} (${data.progress}%)`;
                    setTimeout(poll, 2000);
                }
            } catch (err) {
                setTimeout(poll, 3000);
            }
        };
        poll();
    }

    // ============================================
    // GEMINI CHATBOT
    // ============================================
    const chatBtn = document.getElementById('chatBtn');
    const chatModal = document.getElementById('chatModal');
    const chatClose = document.getElementById('chatClose');
    const chatForm = document.getElementById('chatForm');
    const chatInput = document.getElementById('chatInput');
    const chatMessages = document.getElementById('chatMessages');

    if (chatBtn) {
        chatBtn.addEventListener('click', () => {
            chatModal.classList.toggle('hidden');
        });

        chatClose.addEventListener('click', () => {
            chatModal.classList.add('hidden');
        });

        chatForm.addEventListener('submit', async (e) => {
            e.preventDefault();
            const message = chatInput.value.trim();
            if (!message) return;

            addMessage(message, 'user');
            chatInput.value = '';

            const loadingId = addMessage('⏳ Thinking...', 'bot');

            try {
                const res = await fetch('/api/chat', {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify({ message })
                });
                const data = await res.json();

                document.getElementById(loadingId).remove();

                if (data.reply) {
                    addMessage(data.reply, 'bot');
                } else if (data.error) {
                    addMessage('❌ ' + data.error, 'bot');
                }
            } catch (err) {
                document.getElementById(loadingId).remove();
                addMessage('❌ Error: ' + err.message, 'bot');
            }
        });

        function addMessage(text, type) {
            const id = 'msg-' + Date.now();
            const div = document.createElement('div');
            div.id = id;
            div.className = 'chat-message ' + type;
            div.textContent = text;
            chatMessages.appendChild(div);
            chatMessages.scrollTop = chatMessages.scrollHeight;
            return id;
        }
    }

}); // End DOMContentLoaded