/**
 * Aadhaar Generation Page Logic - Aadhaar Pro
 */

document.addEventListener('DOMContentLoaded', () => {
    initGeneratePage();
});

function initGeneratePage() {
    // Initialize Premium Date Picker
    if (typeof flatpickr !== 'undefined') {
        flatpickr(".date-picker", {
            dateFormat: "d/m/Y",
            allowInput: true
        });
    }

    // Initialize background image loading
    if (typeof loadBackgroundImage === 'function') {
        loadBackgroundImage();
    }

    // Setup Form Listeners
    setupTransliteration();
    setupPincodeAutoFill();
    setupAadhaarFormatting();
    setupPhotoUpload();
    setupRealTimePreview();

    // Print Logic
    const printBtn = document.getElementById('btn-print-aadhaar');
    if (printBtn) {
        printBtn.addEventListener('click', handlePrint);
    }
}

/**
 * Handle Aadhaar Printing and Wallet Deduction
 */
async function handlePrint(e) {
    e.preventDefault();

    // 1. Validation
    const requiredFields = [
        { id: 'in-aadhaar', name: 'Aadhaar Number' },
        { id: 'in-name-en', name: 'Name (English)' },
        { id: 'in-father-en', name: 'Father\'s Name (English)' },
        { id: 'in-dob', name: 'Date of Birth' },
        { id: 'in-village-en', name: 'Village (English)' },
        { id: 'in-post-en', name: 'Post Office (English)' },
        { id: 'in-pin', name: 'Pincode' },
        { id: 'in-district-en', name: 'District (English)' },
        { id: 'in-state-en', name: 'State (English)' },
        { id: 'in-issue-date', name: 'Issued Date' },
        { id: 'in-download-date', name: 'Download Date' }
    ];

    const outPhotoSrc = document.getElementById('out-photo')?.getAttribute('src');
    if (!outPhotoSrc || outPhotoSrc.trim() === '') {
        alert("Kripya Photo Proof upload karein.");
        document.getElementById('in-photo')?.focus();
        return;
    }

    for (let field of requiredFields) {
        let el = document.getElementById(field.id);
        if (el && !el.value.trim()) {
            alert("Kripya '" + field.name + "' fill karein.");
            el.focus();
            return;
        }
    }

    const aadhaarNo = document.getElementById('in-aadhaar').value.replace(/\s/g, '');
    if (aadhaarNo.length !== 12) {
        alert("Please enter a valid 12-digit Aadhaar number.");
        document.getElementById('in-aadhaar').focus();
        return;
    }

    // 2. Check Wallet Balance (skip in dev/admin mode)
    try {
        const checkRes = await fetch('/api/user/info');
        const balanceData = await checkRes.json();

        // Only block if balance is low AND user is not admin
        if (balanceData.balance < 10 && balanceData.role !== 'admin') {
            alert("Insufficient balance! Please add funds to your wallet.");
            window.location.href = '/wallet';
            return;
        }

        // 3. Trigger PDF Generation — function name is generateAadhaarPDF in pdf-generator.js
        if (typeof generateAadhaarPDF === 'function') {
            console.log("Generating Aadhaar PDF...");
            generateAadhaarPDF();

            // Deduct balance after triggering (admin/dev mode skips deduction)
            if (balanceData.role !== 'admin' && balanceData.balance >= 10) {
                setTimeout(async () => {
                    await fetch('/api/wallet/deduct', {
                        method: 'POST',
                        headers: { 'Content-Type': 'application/json' },
                        body: JSON.stringify({ amount: 10, service: 'Aadhaar Print' })
                    });
                    if (typeof updateWalletPill === 'function') updateWalletPill();
                }, 2000);
            }
        } else {
            console.error("generateAadhaarPDF function not found! Check pdf-generator.js is loaded.");
            alert("PDF generator load nahi hua. Page refresh karo.");
        }
    } catch (err) {
        console.error("Print Error:", err);
        alert("An error occurred while processing your request.");
    }
}

/**
 * Pincode Auto-fill Logic
 */
function setupPincodeAutoFill() {
    let pincodeData = {};
    fetch('/static/data/pincodes_hindi.json')
        .then(res => res.json())
        .then(data => { pincodeData = data; })
        .catch(err => console.error("Error loading pincode data:", err));

    const pinInput = document.getElementById("in-pin");
    if (pinInput) {
        pinInput.addEventListener("input", function () {
            let pin = this.value.trim();
            if (pin.length === 6 && pincodeData[pin]) {
                let res = pincodeData[pin];
                document.getElementById("in-district-en").value = res.d || "";
                document.getElementById("in-state-en").value = res.s || "";
                if (document.getElementById("in-district-hi")) document.getElementById("in-district-hi").value = res.dh || "";
                if (document.getElementById("in-state-hi")) document.getElementById("in-state-hi").value = res.sh || "";
                if (typeof updateAddress === 'function') updateAddress();
            }
        });
    }
}

/**
 * Transliteration (English to Hindi) via Google API
 */
function setupTransliteration() {
    const mappings = [
        { en: 'in-name-en', hi: 'in-name-hi' },
        { en: 'in-father-en', hi: 'in-father-hi' },
        { en: 'in-house-en', hi: 'in-house-hi' },
        { en: 'in-village-en', hi: 'in-village-hi' },
        { en: 'in-post-en', hi: 'in-post-hi' },
        { en: 'in-district-en', hi: 'in-district-hi' },
        { en: 'in-state-en', hi: 'in-state-hi' }
    ];

    mappings.forEach(m => {
        const enEl = document.getElementById(m.en);
        const hiEl = document.getElementById(m.hi);
        if (enEl && hiEl) {
            enEl.addEventListener('blur', async () => {
                const text = enEl.value.trim();
                if (!text) return;

                try {
                    const url = `https://inputtools.google.com/request?text=${encodeURIComponent(text)}&itc=hi-t-i0-und&num=1&cp=0&cs=1&ie=utf-8&oe=utf-8&app=demopage`;
                    const res = await fetch(url);
                    const data = await res.json();
                    if (data[0] === 'SUCCESS' && data[1]?.[0]?.[1]?.[0]) {
                        hiEl.value = data[1][0][1][0];
                        hiEl.dispatchEvent(new Event('input'));
                        if (typeof updateAddress === 'function') updateAddress();
                    }
                } catch (e) { console.error("Transliteration fail:", e); }
            });
        }
    });
}

function setupAadhaarFormatting() {
    const input = document.getElementById('in-aadhaar');
    if (input) {
        input.addEventListener('input', (e) => {
            let val = e.target.value.replace(/\D/g, '');
            if (val.length > 12) val = val.slice(0, 12);
            e.target.value = val.replace(/(\d{4})(?=\d)/g, '$1 ');
        });
    }
}

function setupPhotoUpload() {
    const input = document.getElementById('in-photo');
    const preview = document.getElementById('form-photo-preview');
    const placeholder = document.getElementById('photo-placeholder');
    const outPhoto = document.getElementById('out-photo');

    if (input) {
        input.addEventListener('change', (e) => {
            const file = e.target.files[0];
            if (file) {
                const reader = new FileReader();
                reader.onload = (re) => {
                    if (preview) {
                        preview.src = re.target.result;
                        preview.style.display = 'block';
                    }
                    if (placeholder) placeholder.style.display = 'none';
                    if (outPhoto) outPhoto.src = re.target.result;
                };
                reader.readAsDataURL(file);
            } else {
                if (preview) { preview.src = ''; preview.style.display = 'none'; }
                if (placeholder) placeholder.style.display = 'block';
                if (outPhoto) outPhoto.src = '';
            }
        });
    }
}

function setupRealTimePreview() {
    const inputs = document.querySelectorAll('.input-control, input[type="radio"]');
    inputs.forEach(input => {
        input.addEventListener('input', () => {
            // Apply title case to English fields
            if (input.id.endsWith('-en') && input.id !== 'in-aadhaar') {
                input.value = toTitleCase(input.value);
            }
            updateAddress();
        });
    });

    // Initial sync
    updateAddress();
    generateInrolmentNo();
}

/**
 * Main Sync Function: Updates the hidden preview area with form data
 */
function updateAddress() {
    // 1. Sync Basic Fields
    const fields = [
        { from: 'in-name-en', to: 'out-name-en' },
        { from: 'in-name-hi', to: 'out-name-hi' },
        { from: 'in-dob', to: 'out-dob' }
    ];

    fields.forEach(f => {
        const fromEl = document.getElementById(f.from);
        const toEl = document.getElementById(f.to);
        if (fromEl && toEl) toEl.innerText = fromEl.value || "";
    });

    // 2. Sync Aadhaar Number (3 places)
    const adharNo = document.getElementById('in-aadhaar').value.replace(/\s/g, '');
    if (adharNo) {
        const formatted = adharNo.replace(/(\d{4})/g, '$1 ').trim();
        ['out-aadhaar-1', 'out-aadhaar-2', 'out-aadhaar-3'].forEach(id => {
            const el = document.getElementById(id);
            if (el) el.innerText = formatted;
        });
    }

    // 3. Gender Sync
    const genderVal = document.querySelector('input[name="in-gender"]:checked')?.value || "M";
    const gEn = document.getElementById('out-gender-en');
    const gHi = document.getElementById('out-gender-hi');

    if (genderVal === "M") {
        if (gEn) gEn.innerText = "MALE";
        if (gHi) gHi.innerText = "पुरुष";
    } else if (genderVal === "F") {
        if (gEn) gEn.innerText = "FEMALE";
        if (gHi) gHi.innerText = "महिला";
    } else {
        if (gEn) gEn.innerText = "TRANSGENDER";
        if (gHi) gHi.innerText = "ट्रांसजेंडर";
    }

    // 4. Enrollment & Dates Sync
    const issueDate = document.getElementById('in-issue-date')?.value || "";
    const downloadDate = document.getElementById('in-download-date')?.value || "";

    if (document.getElementById('out-inrol-date')) document.getElementById('out-inrol-date').innerText = "Aadhaar No. Issued  :  " + issueDate;
    if (document.getElementById('out-download-date')) document.getElementById('out-download-date').innerText = "Details as on  :  " + downloadDate;
    if (document.getElementById('out-signature-date')) document.getElementById('out-signature-date').innerText = downloadDate + " " + new Date().toLocaleTimeString('en-GB');

    // 5. Build Detailed Enrollment Address List (Top Left)
    const nameEn = document.getElementById('in-name-en')?.value || "";
    const nameHi = document.getElementById('in-name-hi')?.value || "";
    const fatherEn = document.getElementById('in-father-en')?.value || "";
    const houseEn = document.getElementById('in-house-en')?.value || "";
    const villageEn = document.getElementById('in-village-en')?.value || "";
    const postEn = document.getElementById('in-post-en')?.value || "";
    const subdistEn = document.getElementById('in-subdist-en')?.value || "";
    const distEn = document.getElementById('in-district-en')?.value || "";
    const stateEn = document.getElementById('in-state-en')?.value || "";
    const pin = document.getElementById('in-pin')?.value || "";
    const mobile = document.getElementById('in-mobile')?.value || "";
    
    let mobileHtml = mobile.trim() !== "" ? `<br>Mobile: ${mobile}` : "";

    let listHtml = `To<br>${nameHi}<br>${nameEn}<br>S/O: ${fatherEn},<br>${houseEn ? houseEn + ', ' : ''}${villageEn},<br>VTC: ${villageEn},<br>PO: ${postEn},<br>Sub District: ${subdistEn},<br>District: ${distEn},<br>State: ${stateEn},<br>PIN Code: ${pin}${mobileHtml}`;
    const inrolTextEl = document.getElementById('out-inroltext');
    if (inrolTextEl) inrolTextEl.innerHTML = listHtml;

    // 6. Bottom Panels Address Sync
    const addrPartsEn = [
        "S/O: " + fatherEn,
        houseEn, villageEn, postEn,
        "District: " + distEn,
        stateEn + " - " + pin
    ].filter(p => p && p.trim() !== "" && p !== "S/O: ");

    const addrPartsHi = [
        "आत्मज: " + (document.getElementById('in-father-hi')?.value || ""),
        document.getElementById('in-house-hi')?.value,
        document.getElementById('in-village-hi')?.value,
        document.getElementById('in-post-hi')?.value,
        document.getElementById('in-district-hi')?.value,
        (document.getElementById('in-state-hi')?.value || "") + " - " + pin
    ].filter(p => p && p.trim() !== "" && p !== "आत्मज: ");

    if (document.getElementById('out-address-en')) document.getElementById('out-address-en').innerText = addrPartsEn.join(', ');
    if (document.getElementById('out-address-hi')) document.getElementById('out-address-hi').innerText = addrPartsHi.join(', ');

    // 7. Update QR Code
    generateQRData();
}

/**
 * Generate QR Codes based on address data
 */
function generateQRData() {
    const name = document.getElementById('in-name-en').value;
    const gender = document.querySelector('input[name="in-gender"]:checked')?.value || "";
    const dob = document.getElementById('in-dob').value;
    const adhar = document.getElementById('in-aadhaar').value.replace(/\s/g, '');

    // Official-style XML data for QR code
    const qrData = `<?xml version="1.0" encoding="UTF-8"?> <PrintLetterBarcodeData uid="${adhar}" name="${name}" gender="${gender.charAt(0)}" yob="${dob.split('/')[2] || ''}" co="${document.getElementById('in-father-en')?.value || ''}" vtc="${document.getElementById('in-village-en')?.value || ''}" po="${document.getElementById('in-post-en')?.value || ''}" dist="${document.getElementById('in-district-en')?.value || ''}" state="${document.getElementById('in-state-en')?.value || ''}" pc="${document.getElementById('in-pin')?.value || ''}"/>`;

    if (typeof QRious !== 'undefined') {
        const qr1Element = document.getElementById('out-qrcode1');
        const qr2Element = document.getElementById('out-qrcode2');
        // Size 150 for top, 200 for bottom high-res, level 'H' for high density
        if (qr1Element) new QRious({ element: qr1Element, value: qrData, size: 200, level: 'H' });
        if (qr2Element) new QRious({ element: qr2Element, value: qrData, size: 200, level: 'H' });
    }
}

function generateInrolmentNo() {
    const e1 = Math.floor(1000 + Math.random() * 9000);
    const e2 = Math.floor(10000 + Math.random() * 90000);
    const e3 = Math.floor(10000 + Math.random() * 90000);
    const enNo = `नामांकन क्रम/ Enrolment No.: ${e1}/${e2}/${e3}`;
    const el = document.getElementById('out-enrolment-no');
    if (el) el.innerText = enNo;
}

function toTitleCase(str) {
    if (!str) return "";
    return str.replace(/\w\S*/g, (txt) => txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase());
}

/* ============================================
   HISTORY MANAGEMENT LOGIC
   ============================================ */

document.addEventListener('DOMContentLoaded', () => {
    const fab = document.getElementById('history-fab-btn');
    const drawer = document.getElementById('history-drawer');
    const closeBtn = document.getElementById('history-drawer-close');
    const overlay = document.getElementById('history-overlay');

    if (fab) {
        fab.addEventListener('click', () => {
            drawer.classList.add('open');
            overlay.classList.add('active');
            fetchHistory();
        });
    }

    if (closeBtn) {
        closeBtn.addEventListener('click', () => {
            drawer.classList.remove('open');
            overlay.classList.remove('active');
        });
    }

    if (overlay) {
        overlay.addEventListener('click', () => {
            drawer.classList.remove('open');
            overlay.classList.remove('active');
        });
    }

    // Load history count on start
    fetchHistoryCount();
});

async function fetchHistory() {
    const body = document.getElementById('history-drawer-body');
    const emptyState = document.getElementById('history-empty-state');

    try {
        const response = await fetch('/api/history');
        const data = await response.json();

        // Clear previous items (except empty state)
        const existingCards = body.querySelectorAll('.history-card');
        existingCards.forEach(card => card.remove());

        if (data.length === 0) {
            emptyState.style.display = 'flex';
            return;
        }

        emptyState.style.display = 'none';
        data.forEach(item => {
            const card = createHistoryCard(item);
            body.appendChild(card);
        });

        updateHistoryBadge(data.length);
    } catch (err) {
        console.error("Error fetching history:", err);
    }
}

async function fetchHistoryCount() {
    try {
        const response = await fetch('/api/history');
        const data = await response.json();
        updateHistoryBadge(data.length);
    } catch (err) { }
}

function updateHistoryBadge(count) {
    const badge = document.getElementById('history-badge');
    if (badge) {
        if (count > 0) {
            badge.innerText = count;
            badge.style.display = 'flex';
        } else {
            badge.style.display = 'none';
        }
    }
}

function createHistoryCard(item) {
    const card = document.createElement('div');
    card.className = 'history-card';

    // Store data in attribute for safe retrieval
    card.dataset.id = item.id;
    card.dataset.raw = JSON.stringify(item);

    const date = item.timestamp ? new Date(item.timestamp).toLocaleString() : 'Recently';

    card.innerHTML = `
        <div class="history-card-top">
            <div>
                <div class="history-card-name">${item['in-name-en'] || 'Unknown'}</div>
                <div class="history-card-aadhaar">${item['in-aadhaar'] || 'XXXX XXXX XXXX'}</div>
            </div>
            <div class="history-card-time">${date}</div>
        </div>
        <div class="history-card-actions">
            <button class="history-card-btn reprint">
                <i class="fa-solid fa-redo"></i> Reprint
            </button>
            <button class="history-card-btn delete">
                <i class="fa-solid fa-trash-can"></i> Delete
            </button>
        </div>
    `;

    // Attach listeners dynamically
    card.querySelector('.reprint').addEventListener('click', () => {
        repopulateForm(item);
    });

    card.querySelector('.delete').addEventListener('click', () => {
        deleteHistoryItem(item.id, card);
    });

    return card;
}

async function deleteHistoryItem(id, cardEl) {
    // Note: confirm() can hang browser testing subagents
    // if (!confirm("Are you sure you want to delete this print record?")) return;

    try {
        const response = await fetch(`/api/history?id=${id}`, { method: 'DELETE' });
        if (response.ok) {
            cardEl.style.opacity = '0';
            cardEl.style.transform = 'translateX(20px)';
            setTimeout(() => {
                cardEl.remove();
                fetchHistoryCount();
                // If no cards left, show empty state
                const body = document.getElementById('history-drawer-body');
                if (body.querySelectorAll('.history-card').length === 0) {
                    document.getElementById('history-empty-state').style.display = 'flex';
                }
            }, 300);
        }
    } catch (err) {
        console.error("Error deleting history:", err);
    }
}

function repopulateForm(data) {
    // Fill all inputs
    Object.keys(data).forEach(key => {
        const input = document.getElementById(key);
        if (input) {
            if (input.type === 'radio') {
                if (input.value === data[key]) input.checked = true;
            } else if (input.type === 'file') {
                // SKIP file inputs (security error if we set value)
            } else {
                input.value = data[key];
            }
        }
    });

    // Manually restore photo if photo_data exists in history item
    if (data.photo_data) {
        const preview = document.getElementById('form-photo-preview');
        const outPhoto = document.getElementById('out-photo');
        const placeholder = document.getElementById('photo-placeholder');
        
        if (preview) { preview.src = data.photo_data; preview.style.display = 'block'; }
        if (outPhoto) outPhoto.src = data.photo_data;
        if (placeholder) placeholder.style.display = 'none';
    }

    // Close drawer
    document.getElementById('history-drawer').classList.remove('open');
    document.getElementById('history-overlay').classList.remove('active');

    // Trigger update logic
    if (typeof updateAddress === 'function') updateAddress();

    // Automation: Automatically trigger PDF generation after repopulation
    if (typeof generateAadhaarPDF === 'function') {
        setTimeout(() => {
            console.log("Auto-triggering FREE PDF generation from history...");
            generateAadhaarPDF(true); // Pass true for isFree
        }, 300);
    }

    // Scroll to top
    window.scrollTo({ top: 0, behavior: 'smooth' });

    // Show notification (optional, can use existing popup logic)
    console.log("Form repopulated from history");
}