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 scene = document.getElementById('infra-floor-scene');
    const floorSvg = canvas ? canvas.querySelector('.infra-floor-svg') : null;
    if (!canvas || !overlay || !floorSvg || !scene) {
        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 camera = {
        scale: 1,
        tx: 0,
        ty: 0
    };
    const SCALE_MIN = 0.6;
    const SCALE_MAX = 3.5;
    const SCALE_STEP = 0.15;
    let drag = null;

    const clamp = (value, min, max) => Math.min(max, Math.max(min, value));

    const applyCamera = () => {
        scene.style.transform = `translate(${camera.tx}px, ${camera.ty}px) scale(${camera.scale})`;
    };

    const zoomAtCenter = (factor) => {
        const nextScale = clamp(camera.scale * factor, SCALE_MIN, SCALE_MAX);
        if (Math.abs(nextScale - camera.scale) < 0.0001) {
            return;
        }
        camera.scale = nextScale;
        applyCamera();
    };

    const resetCamera = () => {
        camera.scale = 1;
        camera.tx = 0;
        camera.ty = 0;
        applyCamera();
    };

    canvas.addEventListener('wheel', (event) => {
        event.preventDefault();
        zoomAtCenter(event.deltaY < 0 ? (1 + SCALE_STEP) : (1 - SCALE_STEP));
    }, { passive: false });

    canvas.addEventListener('pointerdown', (event) => {
        drag = {
            x: event.clientX,
            y: event.clientY,
            baseX: camera.tx,
            baseY: camera.ty
        };
        canvas.classList.add('is-dragging');
        canvas.setPointerCapture(event.pointerId);
    });

    canvas.addEventListener('pointermove', (event) => {
        if (!drag) {
            return;
        }
        camera.tx = drag.baseX + (event.clientX - drag.x);
        camera.ty = drag.baseY + (event.clientY - drag.y);
        applyCamera();
    });

    const stopDrag = (event) => {
        if (!drag) {
            return;
        }
        drag = null;
        canvas.classList.remove('is-dragging');
        if (event && typeof event.pointerId === 'number') {
            canvas.releasePointerCapture(event.pointerId);
        }
    };

    canvas.addEventListener('pointerup', stopDrag);
    canvas.addEventListener('pointercancel', stopDrag);

    document.querySelectorAll('[data-infra-zoom]').forEach((button) => {
        button.addEventListener('click', () => {
            const action = button.getAttribute('data-infra-zoom');
            if (action === 'in') {
                zoomAtCenter(1 + SCALE_STEP);
                return;
            }
            if (action === 'out') {
                zoomAtCenter(1 - SCALE_STEP);
                return;
            }
            resetCamera();
        });
    });

    applyCamera();

    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;
}