/* Visual Page Inspector — image viewer with SVG marker overlays */

let currentPageData = null;
let currentZoom = 1.0;
let currentVisualPage = 1;
let tooltipDiv = null;

function initializePageViewer(data) {
    if (!data.page_images || Object.keys(data.page_images).length === 0) return;

    document.getElementById('pageViewerCard').style.display = 'block';
    currentPageData = data;

    const pageSelector = document.getElementById('pageSelector');
    const pageNumbers = Object.keys(data.page_images).map(Number).sort((a, b) => a - b);

    pageSelector.innerHTML = pageNumbers.map(pn => {
        const pi = data.issues.filter(i => i.page_number === pn);
        let color = '#10b981';
        if (pi.some(i => i.severity === 'CRITICAL')) color = '#dc2626';
        else if (pi.some(i => i.severity === 'ERROR')) color = '#ef4444';
        else if (pi.some(i => i.severity === 'WARNING')) color = '#f59e0b';

        return `<button onclick="loadVisualPage(${pn})" id="pageBtn${pn}" aria-label="View page ${pn}, ${pi.length} issues"
            style="padding:10px;border:2px solid #ddd;background:var(--surface);border-radius:6px;cursor:pointer;text-align:left;transition:all 0.2s;display:flex;justify-content:space-between;align-items:center;color:var(--text);">
            <span>Page ${pn}</span>
            ${pi.length > 0 ? `<span style="background:${color};color:white;padding:2px 6px;border-radius:12px;font-size:11px;">${pi.length}</span>` : ''}
        </button>`;
    }).join('');

    const firstWithIssues = pageNumbers.find(p => data.issues.some(i => i.page_number === p));
    loadVisualPage(firstWithIssues || pageNumbers[0]);
}

function loadVisualPage(pageNum, highlightNum) {
    if (!currentPageData || !currentPageData.page_images[pageNum]) return;

    currentVisualPage = pageNum;
    document.getElementById('currentPageTitle').textContent = `Page ${pageNum}`;

    document.querySelectorAll('[id^="pageBtn"]').forEach(btn => {
        btn.style.background = 'var(--surface)';
        btn.style.fontWeight = 'normal';
    });
    const sel = document.getElementById(`pageBtn${pageNum}`);
    if (sel) { sel.style.background = 'var(--accent-subtle)'; sel.style.fontWeight = '600'; }

    const img = document.getElementById('pageImage');
    img.onload = () => {
        drawMarkers(pageNum);
        if (highlightNum !== undefined) {
            // Markers are drawn synchronously in drawMarkers — highlight immediately after
            setTimeout(() => highlightMarker(highlightNum), 50);
        }
    };
    // Use GCS URL directly if available, otherwise fall back to api.php
    const imageUrl = currentPageData.page_images[pageNum];
    if (imageUrl && (imageUrl.startsWith('http://') || imageUrl.startsWith('https://'))) {
        img.src = imageUrl;
    } else {
        img.src = `api.php?action=image&job_id=${currentJobId}&page=${pageNum}`;
    }
}

function drawMarkers(pageNum) {
    const svg = document.getElementById('markerOverlay');
    const img = document.getElementById('pageImage');
    svg.innerHTML = '';

    const imgW = img.naturalWidth;
    const imgH = img.naturalHeight;
    const dispW = img.clientWidth;
    const dispH = img.clientHeight;

    const dpi = currentPageData.page_image_dpi || 150;
    const scale = dpi / 72.0;

    svg.setAttribute('viewBox', `0 0 ${imgW} ${imgH}`);
    svg.setAttribute('width', dispW);
    svg.setAttribute('height', dispH);

    const allWithCoords = currentPageData.issues.filter(i => i.coordinates && i.page_number);
    const pageIssues = allWithCoords.filter(i => i.page_number === pageNum);
    if (pageIssues.length === 0) return;

    // Group by coordinates
    const groups = {};
    pageIssues.forEach(issue => {
        const gIdx = allWithCoords.indexOf(issue) + 1;
        const key = `${issue.coordinates.x0}-${issue.coordinates.y0}-${issue.coordinates.x1}-${issue.coordinates.y1}`;
        if (!groups[key]) groups[key] = { coords: issue.coordinates, issues: [], numbers: [], primary: issue };
        groups[key].issues.push(issue);
        groups[key].numbers.push(gIdx);
    });

    Object.values(groups).forEach(group => {
        const coords = group.coords;
        const nums = group.numbers;
        const cnt = group.issues.length;

        const x0 = coords.x0 * scale;
        const y0 = coords.y0 * scale;
        const x1 = coords.x1 * scale;
        const y1 = coords.y1 * scale;

        let stroke, fill;
        switch (group.primary.severity) {
            case 'CRITICAL': stroke = '#dc2626'; fill = 'rgba(220,38,38,0.2)'; break;
            case 'ERROR': stroke = '#ef4444'; fill = 'rgba(239,68,68,0.2)'; break;
            case 'WARNING': stroke = '#f59e0b'; fill = 'rgba(245,158,11,0.2)'; break;
            default: stroke = '#3b82f6'; fill = 'rgba(59,130,246,0.2)';
        }

        const rect = document.createElementNS('http://www.w3.org/2000/svg', 'rect');
        rect.setAttribute('x', x0); rect.setAttribute('y', y0);
        rect.setAttribute('width', x1 - x0); rect.setAttribute('height', y1 - y0);
        rect.setAttribute('fill', fill); rect.setAttribute('stroke', stroke);
        rect.setAttribute('stroke-width', '3'); rect.setAttribute('stroke-dasharray', '5,5');
        rect.setAttribute('rx', '4');
        rect.style.cursor = 'pointer'; rect.style.pointerEvents = 'all';
        rect.addEventListener('mouseenter', e => showIssueTooltip(e, group.issues));
        rect.addEventListener('mouseleave', hideIssueTooltip);
        svg.appendChild(rect);

        const label = cnt > 1 ? `${nums[0]}+${cnt - 1}` : `${nums[0]}`;
        const circle = document.createElementNS('http://www.w3.org/2000/svg', 'circle');
        circle.setAttribute('cx', x0 + 20); circle.setAttribute('cy', y0 + 20);
        circle.setAttribute('r', cnt > 1 ? '18' : '16');
        circle.setAttribute('fill', stroke); circle.setAttribute('stroke', 'white');
        circle.setAttribute('stroke-width', '2'); circle.setAttribute('id', `marker-${nums[0]}`);
        svg.appendChild(circle);

        const text = document.createElementNS('http://www.w3.org/2000/svg', 'text');
        text.setAttribute('x', x0 + 20); text.setAttribute('y', y0 + 26);
        text.setAttribute('text-anchor', 'middle'); text.setAttribute('fill', 'white');
        text.setAttribute('font-size', cnt > 1 ? '11' : '13'); text.setAttribute('font-weight', 'bold');
        text.textContent = label;
        svg.appendChild(text);
    });
}

function showIssueTooltip(event, issues) {
    if (!Array.isArray(issues)) issues = [issues];

    if (!tooltipDiv) {
        tooltipDiv = document.createElement('div');
        Object.assign(tooltipDiv.style, {
            position: 'fixed', background: 'rgba(0,0,0,0.95)', color: 'white',
            padding: '12px', borderRadius: '8px', maxWidth: '400px', maxHeight: '400px',
            overflowY: 'auto', zIndex: '10000', fontSize: '13px', pointerEvents: 'none'
        });
        document.body.appendChild(tooltipDiv);
    }

    const html = issues.map((issue, idx) => `
        <div style="margin-bottom:${idx < issues.length - 1 ? '10px' : '0'};padding-bottom:${idx < issues.length - 1 ? '10px' : '0'};border-bottom:${idx < issues.length - 1 ? '1px solid #444' : 'none'};">
            <div style="font-weight:bold;margin-bottom:3px;color:${getSeverityColor(issue.severity)};">${issue.severity}: ${issue.category}</div>
            <div style="margin-bottom:3px;font-size:12px;">${issue.description}</div>
            ${issue.recommendation ? `<div style="font-size:11px;opacity:0.9;"><strong>Tip:</strong> ${issue.recommendation}</div>` : ''}
        </div>
    `).join('');

    tooltipDiv.innerHTML = issues.length > 1
        ? `<div style="font-size:11px;opacity:0.8;margin-bottom:8px;">${issues.length} issues at this location:</div>` + html
        : html;
    tooltipDiv.style.display = 'block';
    tooltipDiv.style.left = (event.clientX + 15) + 'px';
    tooltipDiv.style.top = (event.clientY + 15) + 'px';
}

function hideIssueTooltip() {
    if (tooltipDiv) tooltipDiv.style.display = 'none';
}

function zoomIn() { currentZoom = Math.min(currentZoom + 0.25, 3.0); applyZoom(); }
function zoomOut() { currentZoom = Math.max(currentZoom - 0.25, 0.5); applyZoom(); }
function resetZoom() { currentZoom = 1.0; applyZoom(); }

function applyZoom() {
    document.getElementById('zoomContainer').style.transform = `scale(${currentZoom})`;
    document.getElementById('zoomLevel').textContent = `${Math.round(currentZoom * 100)}%`;
}

function highlightMarker(issueNumber) {
    const marker = document.getElementById(`marker-${issueNumber}`);
    if (marker) {
        const r = marker.getAttribute('r');
        marker.setAttribute('r', parseFloat(r) * 1.5);
        setTimeout(() => marker.setAttribute('r', r), 300);
        marker.scrollIntoView({ behavior: 'smooth', block: 'center' });
    }
}