// =============================================================================
// MyCard Statement Download Helper (mycard.com.au)
// =============================================================================
// PASTE + ENTER, then click statement rows normally.
// The blob tab still opens (just close it), BUT you also get a properly
// named PDF saved automatically.
//
// TO STOP: just refresh the page (F5)
// =============================================================================

(function () {
    'use strict';

    if (window._mcStatementHelper) {
        if (window._mcOrigWindowOpen) window.open = window._mcOrigWindowOpen;
        console.log('🔄 Restarting MyCard helper...');
    }
    window._mcStatementHelper = true;

    let downloadCount = 0;
    let lastClickedDate = null;
    const downloadedSet = new Set();

    const monthNames = ['', 'January', 'February', 'March', 'April', 'May', 'June',
        'July', 'August', 'September', 'October', 'November', 'December'];

    function extractDate(text) {
        const m = text.match(/(\d{1,2})\s+(January|February|March|April|May|June|July|August|September|October|November|December)\s+(\d{4})/);
        if (!m) return null;
        const monthNum = new Date(`${m[2]} 1, 2000`).getMonth() + 1;
        return { year: m[3], monthNum: String(monthNum).padStart(2, '0'), monthName: m[2] };
    }

    // Click events compose through shadow DOM — use composedPath() to read inner elements
    document.addEventListener('click', function (e) {
        const path = e.composedPath();
        for (const el of path) {
            if (!(el instanceof HTMLElement)) continue;
            // Search this element and its children for <p> with a date
            const paragraphs = el.querySelectorAll ? el.querySelectorAll('p') : [];
            for (const p of paragraphs) {
                const date = extractDate(p.textContent.trim());
                if (date) {
                    lastClickedDate = date;
                    console.log(`⏳ MyCard-Statement-${date.year}-${date.monthNum}-${date.monthName}.pdf...`);
                    return;
                }
            }
        }
    }, true);

    // Also try mousedown with composedPath
    document.addEventListener('mousedown', function (e) {
        const path = e.composedPath();
        for (const el of path) {
            if (!(el instanceof HTMLElement)) continue;
            const paragraphs = el.querySelectorAll ? el.querySelectorAll('p') : [];
            for (const p of paragraphs) {
                const date = extractDate(p.textContent.trim());
                if (date) {
                    lastClickedDate = date;
                    return;
                }
            }
        }
    }, true);

    // Search all shadow roots for dates (fallback)
    function findDateInShadowDom() {
        function searchNode(node) {
            if (node.shadowRoot) {
                const ps = node.shadowRoot.querySelectorAll('p');
                for (const p of ps) {
                    const date = extractDate(p.textContent.trim());
                    if (date) return date;
                }
                for (const child of node.shadowRoot.querySelectorAll('*')) {
                    const result = searchNode(child);
                    if (result) return result;
                }
            }
            return null;
        }
        for (const el of document.querySelectorAll('*')) {
            const result = searchNode(el);
            if (result) return result;
        }
        return null;
    }

    function savePdf(blob, filename) {
        const url = URL.createObjectURL(blob);
        const a = document.createElement('a');
        a.href = url; a.download = filename;
        document.body.appendChild(a); a.click(); document.body.removeChild(a);
        setTimeout(() => URL.revokeObjectURL(url), 2000);
    }

    // Intercept window.open — fetch blob URL and save as named PDF
    const origWindowOpen = window._mcOrigWindowOpen || window.open;
    window._mcOrigWindowOpen = origWindowOpen;
    window.open = function (url, ...rest) {
        const win = origWindowOpen.call(this, url, ...rest);

        if (typeof url === 'string' && url.startsWith('blob:')) {
            if (downloadedSet.has(url)) return win;
            downloadedSet.add(url);
            setTimeout(() => downloadedSet.delete(url), 5000);

            // Try click-tracked date, then shadow DOM scan
            const date = lastClickedDate || findDateInShadowDom();

            fetch(url)
                .then(r => r.blob())
                .then(blob => {
                    return blob.slice(0, 5).text().then(h => {
                        if (h !== '%PDF-') return;
                        let fn;
                        if (date) {
                            fn = `MyCard-Statement-${date.year}-${date.monthNum}-${date.monthName}.pdf`;
                        } else {
                            fn = `MyCard-Statement-${Date.now()}.pdf`;
                        }
                        savePdf(blob, fn);
                        downloadCount++;
                        console.log(`✅ #${downloadCount} ${fn} (${(blob.size / 1024).toFixed(0)} KB)`);
                        console.log(`   Close the blob tab, then click next statement.`);
                    });
                })
                .catch(err => console.error('❌ Failed:', err));
        }

        return win;
    };

    console.log('');
    console.log('✅ MyCard download helper active!');
    console.log('👆 Click statement rows normally.');
    console.log('   Each click: PDF saves as file + blob tab opens (close it).');
    console.log('   To stop: refresh (F5)');
    console.log('');
})();