document.addEventListener('DOMContentLoaded', () => {
    const SVG_NS = 'http://www.w3.org/2000/svg';
    const DEFAULT_PLAN_SIZE = { width: 2000, height: 1000 };

    const filterForm = document.getElementById('infra-filter-form');
    const floorSelect = document.getElementById('infra-floor-select');
    if (filterForm && floorSelect) {
        floorSelect.addEventListener('change', () => {
            filterForm.submit();
        });
    }

    const canvas = document.getElementById('infra-floor-canvas');
    const overlay = document.getElementById('infra-floor-overlay');
    const floorSvg = canvas ? canvas.querySelector('.infra-floor-svg') : null;
    if (!canvas || !overlay || !floorSvg) {
        return;
    }

    const patchPanels = safeJsonParse(canvas.dataset.patchpanels);
    const outlets = safeJsonParse(canvas.dataset.outlets);
    const planSize = { ...DEFAULT_PLAN_SIZE };

    const updateOverlayViewBox = () => {
        overlay.setAttribute('viewBox', `0 0 ${planSize.width} ${planSize.height}`);
    };

    const createMarker = (entry, type) => {
        const x = Number(entry.x);
        const y = Number(entry.y);
        if (!Number.isFinite(x) || !Number.isFinite(y)) {
            return;
        }

        const marker = document.createElementNS(SVG_NS, 'rect');
        marker.classList.add('infra-overlay-marker', type);
        marker.setAttribute('x', String(Math.round(x)));
        marker.setAttribute('y', String(Math.round(y)));

        if (type === 'patchpanel') {
            marker.setAttribute('width', String(Math.max(1, Number(entry.width) || 20)));
            marker.setAttribute('height', String(Math.max(1, Number(entry.height) || 5)));
        } else {
            marker.setAttribute('width', '10');
            marker.setAttribute('height', '10');
        }

        const tooltipLines = buildTooltipLines(entry, type);
        if (tooltipLines.length > 0) {
            const titleNode = document.createElementNS(SVG_NS, 'title');
            titleNode.textContent = tooltipLines.join('\n');
            marker.appendChild(titleNode);
        }

        overlay.appendChild(marker);
    };

    patchPanels.forEach((entry) => createMarker(entry, 'patchpanel'));
    outlets.forEach((entry) => createMarker(entry, 'outlet'));

    const loadPlanDimensions = async (svgUrl) => {
        if (!svgUrl) {
            updateOverlayViewBox();
            return;
        }
        try {
            const response = await fetch(svgUrl, { credentials: 'same-origin' });
            if (!response.ok) {
                throw new Error('SVG not available');
            }
            const raw = await response.text();
            const parser = new DOMParser();
            const doc = parser.parseFromString(raw, 'image/svg+xml');
            const root = doc.documentElement;
            if (!root || root.nodeName.toLowerCase() === 'parsererror') {
                throw new Error('Invalid SVG');
            }

            const vb = String(root.getAttribute('viewBox') || '').trim();
            if (vb) {
                const parts = vb.split(/\s+/).map((value) => Number(value));
                if (parts.length === 4 && parts.every((value) => Number.isFinite(value))) {
                    planSize.width = Math.max(1, parts[2]);
                    planSize.height = Math.max(1, parts[3]);
                    updateOverlayViewBox();
                    return;
                }
            }

            const width = Number(root.getAttribute('width'));
            const height = Number(root.getAttribute('height'));
            if (Number.isFinite(width) && Number.isFinite(height) && width > 0 && height > 0) {
                planSize.width = width;
                planSize.height = height;
            } else {
                planSize.width = DEFAULT_PLAN_SIZE.width;
                planSize.height = DEFAULT_PLAN_SIZE.height;
            }
            updateOverlayViewBox();
        } catch (error) {
            planSize.width = DEFAULT_PLAN_SIZE.width;
            planSize.height = DEFAULT_PLAN_SIZE.height;
            updateOverlayViewBox();
        }
    };

    loadPlanDimensions(floorSvg.getAttribute('src') || '');
});

function safeJsonParse(value) {
    if (!value) {
        return [];
    }
    try {
        const parsed = JSON.parse(value);
        return Array.isArray(parsed) ? parsed : [];
    } catch (error) {
        return [];
    }
}

function buildTooltipLines(entry, type) {
    if (type === 'patchpanel') {
        const lines = [
            `Patchpanel: ${entry.name || '-'}`,
            `Ports: ${Number(entry.port_count) || 0}`,
            `Position: ${Number(entry.x) || 0} x ${Number(entry.y) || 0}`
        ];
        if (entry.comment) {
            lines.push(`Kommentar: ${entry.comment}`);
        }
        return lines;
    }

    const roomLabel = `${entry.room_name || '-'}${entry.room_number ? ` (${entry.room_number})` : ''}`;
    const lines = [
        `Wandbuchse: ${entry.name || '-'}`,
        `Raum: ${roomLabel}`,
        `Position: ${Number(entry.x) || 0} x ${Number(entry.y) || 0}`
    ];
    if (entry.port_names) {
        lines.push(`Ports: ${entry.port_names}`);
    }
    if (entry.comment) {
        lines.push(`Kommentar: ${entry.comment}`);
    }
    return lines;
}