// API Configuration
const API_BASE_URL = '/api';
let userPersona = 'explorer'; // Default

const chatMessages = document.getElementById('chat-messages');
const userInput = document.getElementById('user-input');
const sendBtn = document.getElementById('send-btn');
const onboardingOverlay = document.getElementById('onboarding-overlay');
const appContainer = document.querySelector('.app-container');
const switchBtn = document.getElementById('switch-btn');
const profileStatus = document.getElementById('profile-status');
const attachBtn = document.getElementById('attach-btn');
const fileUpload = document.getElementById('file-upload');
const personaTooltip = document.getElementById('persona-tooltip');
const infoTrigger = document.getElementById('info-trigger');

let isRequestInProgress = false;
let currentDraftText = "";
let lastCustomFields = null;
let lastFormValues = null;

// Persona Capability Data
const personaCapabilities = {
    lawyer: "<strong>Legal Professional Mode</strong><br>Optimized for deep statutory analysis, procedural advice, and drafting formal legal documents with precise terminology.",
    student: "<strong>Academic Mode</strong><br>Focuses on legal theory, landmark Supreme Court cases, and historical context of Indian laws.",
    citizen: "<strong>Empowerment Mode</strong><br>Provides simple explanations of legal rights, RTI support, and step-by-step guidance for basic legal issues.",
    explorer: "<strong>Orientation Mode</strong><br>General overview of the Indian judicial hierarchy, history, and fundamental legal concepts."
};

function setLockdown(active) {
    isRequestInProgress = active;
    if (active) {
        document.body.classList.add('lockdown-active');
        userInput.placeholder = "Judicial Lockdown: Analysis in progress...";
        sendBtn.disabled = true;
    } else {
        document.body.classList.remove('lockdown-active');
        userInput.placeholder = "Enter your legal query here...";
        sendBtn.disabled = false;
    }
}

// Handle File Upload
attachBtn.addEventListener('click', () => fileUpload.click());

fileUpload.addEventListener('change', async (e) => {
    const file = e.target.files[0];
    if (!file) return;

    addMessage(`Uploading ${file.name}...`, 'user');
    
    const formData = new FormData();
    formData.append('file', file);

    try {
        const response = await fetch(`${API_BASE_URL}/upload`, {
            method: 'POST',
            body: formData
        });
        
        const data = await response.json();
        if (data.text) {
            userInput.value = `Audit this document: \n\n ${data.text.substring(0, 1000)}...`;
            addMessage(`Document ${file.name} processed. I have extracted the text. Click Execute to start the audit.`, 'system');
        }
    } catch (err) {
        addMessage(`Error uploading file: ${err.message}`, 'system');
    }
});
document.querySelectorAll('.persona-btn').forEach(btn => {
    btn.addEventListener('click', () => {
        userPersona = btn.getAttribute('data-persona');
        onboardingOverlay.classList.add('hidden');
        appContainer.classList.remove('blur-background');
        
        // Update top bar status
        profileStatus.innerText = userPersona.charAt(0).toUpperCase() + userPersona.slice(1) + " Dashboard";

        // Apply Dynamic Theme
        document.documentElement.setAttribute('data-theme', userPersona);
        
        // Update Wisdom Tooltip
        personaTooltip.innerHTML = personaCapabilities[userPersona];
        
        addMessage(`Welcome! You are now connected as a **${userPersona.toUpperCase()}**. How can I help you navigate the legal system today?`, 'system');
    });
});

function highlightCitations(text) {
    // Regex to find common Indian legal citations (e.g., Section 302, Article 21, IPC 302)
    const citationRegex = /\b(Section|Article|Act|Clause)\s+\d+[A-Z]?\b|\b(IPC|BNS|CRPC|CPC|DPDPA)\s+\d+[A-Z]?\b/gi;
    return text.replace(citationRegex, (match) => {
        return `<span class="legal-citation" title="Judicial Reference">${match}</span>`;
    });
}

switchBtn.addEventListener('click', () => {
    onboardingOverlay.classList.remove('hidden');
    appContainer.classList.add('blur-background');
});

// Motto Carousel Data
const mottos = [
    { text: "सत्यमेव जयते", lang: "Hindi" },
    { text: "সত্যমেব জয়তে", lang: "Bengali" },
    { text: "सत्यमेव जयते", lang: "Marathi" },
    { text: "సత్యమేవ జయతే", lang: "Telugu" },
    { text: "சத்யமேவ ஜெயதே", lang: "Tamil" },
    { text: "સત્યમેવ જયતે", lang: "Gujarati" },
    { text: "ستیہ میو جیتے", lang: "Urdu" },
    { text: "ಸತ್ಯಮೇವ ಜಯತೇ", lang: "Kannada" },
    { text: "ସତ୍ୟମେବ ଜୟତେ", lang: "Odia" },
    { text: "സത്യമേവ ജയതേ", lang: "Malayalam" }
];

let currentMottoIndex = 0;
const mottoText = document.getElementById('motto-text');
const mottoLang = document.getElementById('motto-lang');

function updateMotto() {
    mottoText.classList.add('fade-out');
    mottoLang.classList.add('fade-out');

    setTimeout(() => {
        currentMottoIndex = (currentMottoIndex + 1) % mottos.length;
        mottoText.innerText = mottos[currentMottoIndex].text;
        mottoLang.innerText = mottos[currentMottoIndex].lang;
        
        mottoText.classList.remove('fade-out');
        mottoLang.classList.remove('fade-out');
    }, 500);
}

setInterval(updateMotto, 4000); // Change every 4 seconds

function addMessage(text, sender) {
    if (text.includes('===REQUEST_NOTICE_FORM===')) {
        try {
            const parts = text.split('===REQUEST_NOTICE_FORM===');
            const jsonStr = parts[1].trim();
            const customFields = JSON.parse(jsonStr);
            addNoticeForm(customFields);
        } catch (e) {
            console.error("Failed to parse custom fields from LLM", e);
            addNoticeForm(["Sender Details (Name, Address)", "Receiver Details (Name, Address)", "Grievance / Cause of Action", "Relief / Demand"]);
        }
        return;
    }

    const msgDiv = document.createElement('div');
    msgDiv.className = `message ${sender}`; // Explicitly set classes
    
    // Highlight Citations
    let highlightedText = highlightCitations(text);
    
    // Add Spark Icon for System
    if (sender === 'system') {
        const spark = document.createElement('div');
        spark.className = 'system-spark';
        spark.innerHTML = '✨';
        msgDiv.appendChild(spark);
    }
    
    const contentDiv = document.createElement('div');
    contentDiv.className = 'message-content';
    let renderText = highlightedText.replace('===DRAFT BEGIN===', '').replace('===DRAFT END===', '');
    contentDiv.innerHTML = marked.parse(renderText);
    msgDiv.appendChild(contentDiv);

    // Action Button Detection (Proactive Agent Feature)
    if (sender === 'system') {
        const actionArea = document.createElement('div');
        actionArea.classList.add('action-area');

        let hasDraft = text.includes('===DRAFT BEGIN===');

        if (hasDraft) {
            // Helper function to extract just the draft
            const extractDraft = (fullText) => {
                const startMarker = '===DRAFT BEGIN===';
                const endMarker = '===DRAFT END===';
                let startIndex = fullText.indexOf(startMarker);
                let endIndex = fullText.indexOf(endMarker);
                if (startIndex !== -1 && endIndex !== -1) {
                    return fullText.substring(startIndex + startMarker.length, endIndex).trim();
                }
                return fullText; // Fallback
            };
            
            const draftText = extractDraft(text);
            currentDraftText = draftText; // Store globally for editing

            const copyBtn = createActionButton('copy', 'Copy Draft', () => {
                navigator.clipboard.writeText(draftText);
                alert('Draft copied to clipboard! (Satyameva Jayate)');
            });
            actionArea.appendChild(copyBtn);

            const docBtn = createActionButton('file-text', 'Download DOC', () => exportToDoc(draftText));
            actionArea.appendChild(docBtn);

            const pdfBtn = createActionButton('download', 'Download PDF', () => exportToPdf(draftText));
            actionArea.appendChild(pdfBtn);
            
            const editBtn = createActionButton('edit-3', 'Edit Draft', () => {
                if (lastCustomFields && lastFormValues) {
                    addNoticeForm(lastCustomFields, lastFormValues);
                } else {
                    addNoticeForm([], []); // Show form with just Additional Instructions
                }
            });
            actionArea.appendChild(editBtn);
        } else {
            if (text.toLowerCase().includes('rti query') || text.toLowerCase().includes('rti act')) {
                const btn = createActionButton('scroll', 'Draft RTI Query', () => {
                    userInput.value = "Draft an RTI query for this matter.";
                    handleSendMessage();
                });
                actionArea.appendChild(btn);
            }

            if (text.toLowerCase().includes('legal notice')) {
                const btn = createActionButton('file-text', 'Prepare Legal Notice', () => {
                    userInput.value = "Please draft a legal notice for this matter.";
                    handleSendMessage();
                });
                actionArea.appendChild(btn);
            }
        }

        if (actionArea.children.length > 0) {
            msgDiv.appendChild(actionArea);
        }
    }
    
    const time = new Date().toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' });
    const timeSpan = document.createElement('span');
    timeSpan.classList.add('message-time');
    timeSpan.innerText = time;
    msgDiv.appendChild(timeSpan);
    
    chatMessages.appendChild(msgDiv);
    setTimeout(scrollToBottom, 50); // Small delay for smooth rendering
    lucide.createIcons();
}

function scrollToBottom() {
    chatMessages.scrollTo({
        top: chatMessages.scrollHeight,
        behavior: 'smooth'
    });
}

function exportToDoc(text) {
    const header = "<html xmlns:o='urn:schemas-microsoft-com:office:office' xmlns:w='urn:schemas-microsoft-com:office:word' xmlns='http://www.w3.org/TR/REC-html40'><head><meta charset='utf-8'><title>Legal Draft</title></head><body>";
    const footer = "</body></html>";
    const sourceHTML = header + marked.parse(text) + footer;
    
    const source = 'data:application/vnd.ms-word;charset=utf-8,' + encodeURIComponent(sourceHTML);
    const fileDownload = document.createElement("a");
    document.body.appendChild(fileDownload);
    fileDownload.href = source;
    fileDownload.download = 'Nyaya_Legal_Draft.doc';
    fileDownload.click();
    document.body.removeChild(fileDownload);
}

function exportToPdf(text) {
    // Premium Print Mode for PDF
    const printWindow = window.open('', '_blank');
    printWindow.document.write(`
        <html>
            <head>
                <title>Nyaya Legal Draft</title>
                <style>
                    body { font-family: 'Times New Roman', serif; padding: 50px; line-height: 1.6; }
                    h1, h2 { color: #4a0e0e; border-bottom: 2px solid #c5a059; }
                    .watermark { position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%) rotate(-45deg); opacity: 0.1; font-size: 80px; z-index: -1; }
                </style>
            </head>
            <body>
                <div class="watermark">NYAYA AGENT</div>
                ${marked.parse(text)}
                <script>setTimeout(() => { window.print(); window.close(); }, 500);</script>
            </body>
        </html>
    `);
    printWindow.document.close();
}

function createActionButton(icon, label, callback) {
    const btn = document.createElement('button');
    btn.classList.add('action-btn');
    btn.innerHTML = `<i data-lucide="${icon}"></i> <span>${label}</span>`;
    btn.onclick = callback;
    return btn;
}

function addNoticeForm(customFields = ["Sender Details (Name, Address)", "Receiver Details (Name, Address)", "Grievance / Cause of Action", "Relief / Demand"], previousValues = null) {
    const msgDiv = document.createElement('div');
    msgDiv.className = `message system`;
    
    // Generate unique ID suffix for this specific form instance
    const uniqueId = Date.now();
    
    // Store globally for edit draft
    lastCustomFields = customFields;
    
    let inputsHtml = customFields.map((field, index) => {
        const isLongText = field.toLowerCase().includes('grievance') || field.toLowerCase().includes('relief') || field.toLowerCase().includes('grounds') || field.toLowerCase().includes('facts');
        const isDate = field.toLowerCase().includes('date');
        
        let value = previousValues && previousValues[index] ? previousValues[index] : "";
        value = value.replace(/"/g, '&quot;');
        
        if (isLongText) {
            return `<textarea id="notice-field-${index}-${uniqueId}" placeholder="${field}" class="form-input">${value}</textarea>`;
        } else if (isDate) {
            const today = new Date().toISOString().split('T')[0];
            return `
                <div style="margin-bottom: 0.5rem; color: rgba(255,255,255,0.7); font-size: 0.85rem;">${field}</div>
                <input type="date" id="notice-field-${index}-${uniqueId}" min="1947-01-01" max="${today}" class="form-input" value="${value}">
            `;
        } else {
            return `<input type="text" id="notice-field-${index}-${uniqueId}" placeholder="${field}" class="form-input" value="${value}">`;
        }
    }).join('');

    let additionalInstructionsHtml = previousValues ? `
        <div style="margin-bottom: 0.5rem; color: rgba(255,255,255,0.7); font-size: 0.85rem; margin-top: 10px;">Additional Instructions / Changes</div>
        <textarea id="notice-additional-instructions-${uniqueId}" placeholder="e.g. Include a demand for 18% interest, or update the date" class="form-input" style="border-color: var(--judicial-gold); min-height: 50px;"></textarea>
    ` : "";

    const formTitle = previousValues ? "Edit Draft" : "Prepare Draft";
    const btnText = previousValues ? "Update Draft" : "Prepare Draft";

    msgDiv.innerHTML = `
        <div class="message-content">
            <h3 style="color: var(--judicial-gold); margin-bottom: 15px; font-family: 'Playfair Display', serif; border-bottom: 1px solid rgba(197, 160, 89, 0.2); padding-bottom: 0.5rem;">${formTitle}</h3>
            <p style="margin-bottom: 10px;">Please provide the details below.</p>
            <div class="legal-form-container">
                ${inputsHtml}
                ${additionalInstructionsHtml}
                <button class="gold-btn form-submit-btn" id="generate-notice-btn-${uniqueId}"><i data-lucide="file-text"></i> ${btnText}</button>
            </div>
        </div>
    `;
    
    chatMessages.appendChild(msgDiv);
    
    setTimeout(() => {
        const btn = document.getElementById(`generate-notice-btn-${uniqueId}`);
        if(btn) {
            btn.onclick = () => {
                let promptParts = [];
                let currentValues = [];
                
                customFields.forEach((field, index) => {
                    const el = document.getElementById(`notice-field-${index}-${uniqueId}`);
                    if (el && el.value.trim()) {
                        promptParts.push(`**${field}:** ${el.value.trim()}`);
                    }
                    currentValues.push(el.value.trim());
                });
                
                // Save values globally for next edit
                lastFormValues = currentValues;

                const additionalEl = document.getElementById(`notice-additional-instructions-${uniqueId}`);
                if (additionalEl && additionalEl.value.trim()) {
                    promptParts.push(`**Additional Instructions / Changes:** ${additionalEl.value.trim()}`);
                }

                btn.disabled = true;
                btn.innerHTML = `<i data-lucide="loader" class="spin"></i> Drafting...`;
                
                let combinedPrompt = "Please prepare the formal legal draft using the following details:\\n\\n" + promptParts.join('\\n\\n');
                
                if (previousValues && currentDraftText) {
                    combinedPrompt += "\\n\\n===EXISTING DRAFT TO MODIFY===\\n" + currentDraftText + "\\n===END EXISTING DRAFT===\\n\\nPlease apply the requested changes/details to the existing draft and return the FULL updated draft.";
                }
                
                userInput.value = combinedPrompt;
                handleSendMessage();
            };
        }
        lucide.createIcons();
    });
    
    setTimeout(() => {
        chatMessages.scrollTo({
            top: chatMessages.scrollHeight,
            behavior: 'smooth'
        });
    }, 50);
    lucide.createIcons();
}

async function handleSendMessage() {
    if (isRequestInProgress) return;
    const text = userInput.value.trim();
    if (!text) return;

    setLockdown(true);

    // Add user message to UI
    addMessage(text, 'user');
    userInput.value = '';

    // Show animated loading indicator
    const loadingId = 'loading-' + Date.now();
    const loadingDiv = document.createElement('div');
    loadingDiv.id = loadingId;
    loadingDiv.classList.add('message', 'system', 'glass', 'legal-loader');
    loadingDiv.innerHTML = `
        <div class="gavel-animate"><i data-lucide="gavel"></i></div>
        <div class="loader-text">Order in the Court... Analyzing</div>
    `;
    chatMessages.appendChild(loadingDiv);
    lucide.createIcons();
    scrollToBottom();

    try {
        const apiPayload = { 
            message: text,
            persona: userPersona
        };

        // Silently inject the draft text if the user is editing it
        if (text.includes("Please modify the draft") && currentDraftText) {
            apiPayload.message = text + `\n\n===CURRENT DRAFT===\n${currentDraftText}`;
        }

        const response = await fetch(`${API_BASE_URL}/chat`, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify(apiPayload)
        });

        const data = await response.json();
        
        // Remove loading indicator
        document.getElementById(loadingId).remove();

        if (data.response) {
            addMessage(data.response, 'system');
        } else if (data.detail) {
            addMessage(`Error: ${data.detail}`, 'system');
        }
    } catch (error) {
        if (document.getElementById(loadingId)) document.getElementById(loadingId).remove();
        addMessage(`Connection Error: Could not reach the Judicial Network. Ensure the server is running.`, 'system');
        console.error('API Error:', error);
    } finally {
        setLockdown(false);
    }
}

sendBtn.addEventListener('click', handleSendMessage);

userInput.addEventListener('keypress', (e) => {
    if (e.key === 'Enter') {
        handleSendMessage();
    }
});

addMessage("Greetings. I am **Nyaya Agent**. I am ready to assist with your legal research, drafting, or compliance queries.", "system");

// Sidebar Navigation
const toolExamples = {
    search: "Search for landmark cases. e.g., 'Find Supreme Court judgments on Right to Privacy (Justice K.S. Puttaswamy case)'",
    notice: "Prepare a formal notice. e.g., 'Help me draft a legal notice for non-payment of rent by a tenant.'",
    rti: "Draft an RTI application. e.g., 'Draft an RTI to find out the status of road repairs in Ward 12.'",
    compliance: "Upload a legal document using the paperclip icon (📎) below for the app to analyze. e.g., 'Audit this privacy policy for compliance with DPDPA 2023.'",
    bridge: "Translate old criminal laws (IPC, CrPC) to the newly enacted Bharatiya Nyaya Sanhita (BNS). e.g., 'What is the new BNS law for cheating (formerly IPC 420)?'"
};

document.querySelectorAll('.nav-item').forEach(item => {
    item.addEventListener('click', () => {
        if (isRequestInProgress) {
            alert('Judicial Lockdown Active: Please wait for the current analysis to complete.');
            return;
        }

        document.querySelectorAll('.nav-item').forEach(btn => btn.classList.remove('active'));
        item.classList.add('active');
        
        const tool = item.getAttribute('data-tool');
        
        // Toggle attachment button visibility
        const attachBtn = document.getElementById('attach-btn');
        if (attachBtn) {
            attachBtn.style.display = (tool === 'compliance') ? 'flex' : 'none';
        }

        if (tool !== 'chat') {
            const example = toolExamples[tool];
            const moduleName = tool === 'bridge' ? 'Law BRIDGE' : tool.toUpperCase();
            addMessage(`Switched to **${moduleName}** module.\n\n**Example:** ${example}`, 'system');
        }
    });
});