// =============================================================================
// Westpac Statement Download Helper
// =============================================================================
// PASTE + ENTER, then click Download PDF buttons normally.
// Instead of opening in a new tab, the PDF saves as a properly named file.
//
// TO STOP: just refresh the page (F5)
// =============================================================================

(function () {
    'use strict';

    let downloadCount = 0;

    // Get the currently selected account name for the filename
    function getAccountName() {
        const select = document.getElementById('AccountGlobalId');
        if (!select) return 'Account';
        const text = select.options[select.selectedIndex].text.trim();
        // Extract just the account name (before the number/balance)
        // e.g., "Altitude Qantas Black Card  xxxx xxxx xx77 8032   -$10,272.88"
        //     → "Altitude-Qantas-Black-Card"
        // e.g., "Westpac Choice  733-501 714878   $0.00"
        //     → "Westpac-Choice"
        const match = text.match(/^(.+?)\s{2,}/);
        if (match) {
            return match[1].trim().replace(/\s+/g, '-');
        }
        return text.split(/\s{2,}/)[0].trim().replace(/\s+/g, '-');
    }

    // Parse date from the statement row
    function getDateFromRow(row) {
        const dateCell = row.querySelector('td.date span[data-bind*="FormattedDate"]');
        if (!dateCell) return null;
        const text = dateCell.textContent.trim(); // e.g., "22 Feb 2026"
        const match = text.match(/(\d{1,2})\s+(\w{3})\s+(\d{4})/);
        if (!match) return null;
        const [, day, monthShort, year] = match;
        const monthNum = new Date(`${monthShort} 1, 2000`).getMonth() + 1;
        const monthNames = ['', 'January', 'February', 'March', 'April', 'May', 'June',
            'July', 'August', 'September', 'October', 'November', 'December'];
        return {
            year,
            monthNum: String(monthNum).padStart(2, '0'),
            monthName: monthNames[monthNum]
        };
    }

    // Intercept clicks on Download PDF links
    document.addEventListener('click', function (e) {
        const link = e.target.closest('td.tf-actions a.btn');
        if (!link) return;

        const href = link.getAttribute('href');
        if (!href || !href.includes('getpdfstatement')) return;

        // Prevent the default (opening in new tab)
        e.preventDefault();
        e.stopPropagation();

        const row = link.closest('tr');
        const dateInfo = row ? getDateFromRow(row) : null;
        const accountName = getAccountName();

        let filename;
        if (dateInfo) {
            filename = `Westpac-${accountName}-${dateInfo.year}-${dateInfo.monthNum}-${dateInfo.monthName}.pdf`;
        } else {
            filename = `Westpac-${accountName}-${Date.now()}.pdf`;
        }

        console.log(`⏳ Downloading ${filename}...`);

        // Fetch the PDF and save it
        fetch(href, { credentials: 'include' })
            .then(response => {
                if (!response.ok) throw new Error(`HTTP ${response.status}`);
                return response.blob();
            })
            .then(blob => {
                const url = URL.createObjectURL(blob);
                const a = document.createElement('a');
                a.href = url;
                a.download = filename;
                document.body.appendChild(a);
                a.click();
                document.body.removeChild(a);
                setTimeout(() => URL.revokeObjectURL(url), 2000);
                downloadCount++;
                console.log(`✅ #${downloadCount} ${filename} (${(blob.size / 1024).toFixed(0)} KB)`);
            })
            .catch(err => {
                console.error(`❌ Failed to download ${filename}:`, err);
                console.log('   Opening in new tab as fallback...');
                window.open(href, '_blank');
            });
    }, true);

    console.log('');
    console.log('✅ Westpac download helper active!');
    console.log('👆 Click Download PDF buttons normally.');
    console.log('   Each click: PDF saves as a named file (no new tab).');
    console.log('   To stop: refresh (F5)');
    console.log('');
})();