/**
 * MAPS TOPOLOGI - MAPLIBRE VERSION
 * Menampilkan marker dinamis dengan icon custom
 */

let map;
const markers = []; // Array untuk menyimpan instance marker
var currentStyle = 'hybrid';

// --- DEFINISI STYLE GOOGLE MAPS ---
const googleHybridStyle = {
    'version': 8,
    'sources': {
        'google-hybrid': {
            'type': 'raster',
            'tiles': ['https://mt1.google.com/vt/lyrs=y&x={x}&y={y}&z={z}'],
            'tileSize': 256,
            'attribution': '© Google Maps'
        }
    },
    'layers': [{
        'id': 'google-hybrid-layer',
        'type': 'raster',
        'source': 'google-hybrid',
        'minzoom': 0,
        'maxzoom': 22
    }]
};

const googleStreetStyle = {
    'version': 8,
    'sources': {
        'google-street': {
            'type': 'raster',
            'tiles': ['https://mt1.google.com/vt/lyrs=m&x={x}&y={y}&z={z}'],
            'tileSize': 256,
            'attribution': '© Google Maps'
        }
    },
    'layers': [{
        'id': 'google-street-layer',
        'type': 'raster',
        'source': 'google-street',
        'minzoom': 0,
        'maxzoom': 22
    }]
};

function initMap(center) {
    // Init MapLibre
    map = new maplibregl.Map({
        container: 'map',
        style: googleHybridStyle, // Default Hybrid
        center: [center.lng, center.lat], // [Lng, Lat]
        zoom: 10,
        attributionControl: true,
        dragRotate: false,
        pitchWithRotate: false,
        touchPitch: false
    });
    
    map.touchZoomRotate.disableRotation();
    map.addControl(new maplibregl.NavigationControl({ showCompass: false, showZoom: true }), 'top-right');
    map.addControl(new maplibregl.FullscreenControl(), 'top-left');

    // Tambahkan tombol ganti layer
    addLayerSwitcher();

    // Tunggu map load sebelum ambil data marker
    map.on('load', function() {
        fetchMarkers();
        // Refresh marker tiap 30 detik
        setInterval(fetchMarkers, 30000);
    });
}

function addLayerSwitcher() {
    class LayerSwitchControl {
        onAdd(map) {
            this._map = map;
            this._container = document.createElement('div');
            this._container.className = 'maplibregl-ctrl maplibregl-ctrl-group';
            
            const btn = document.createElement('button');
            btn.innerHTML = '🗺️'; // Icon peta
            btn.title = "Ganti Tampilan (Satelit/Jalan)";
            btn.type = "button";
            btn.onclick = () => {
                // Logic ganti style
                if (currentStyle === 'hybrid') {
                    map.setStyle(googleStreetStyle);
                    currentStyle = 'street';
                    // Kita perlu fetch ulang marker karena ganti style me-reset canvas DOM di beberapa versi
                    setTimeout(fetchMarkers, 500); 
                } else {
                    map.setStyle(googleHybridStyle);
                    currentStyle = 'hybrid';
                    setTimeout(fetchMarkers, 500);
                }
            };
            this._container.appendChild(btn);
            return this._container;
        }
        onRemove() {
            this._container.parentNode.removeChild(this._container);
            this._map = undefined;
        }
    }
    map.addControl(new LayerSwitchControl(), 'top-right');
}

function fetchMarkers() {
    // topologiId diambil dari variabel global di halaman PHP
    fetch(`load/maps_marker.php?i=${topologiId}`)
        .then(response => {
            if (!response.ok) throw new Error('Network response was not ok');
            return response.json();
        })
        .then(res => {
            if (!res.status) {
                console.warn("⚠️ Tidak ada data marker");
                return;
            }

            // 1. Hapus marker lama dari peta
            markers.forEach(marker => marker.remove());
            markers.length = 0; // Kosongkan array

            // 2. Tambahkan marker baru
            res.data.forEach(markerData => {
                // Buat elemen HTML Custom untuk Icon
                const el = document.createElement('div');
                el.className = 'custom-marker';
                
                // Masukkan gambar icon dari API
                const img = document.createElement('img');
                img.src = markerData.icon; // URL icon dari database
                img.style.width = '30px';
                img.style.height = '30px';
                img.style.display = 'block';
                // Opsional: tambahkan style cursor
                el.style.cursor = 'pointer';
                el.appendChild(img);

                // Buat Marker MapLibre
                const markerInstance = new maplibregl.Marker({
                    element: el,
                    // anchor bottom agar ujung bawah icon menunjuk ke lokasi persis
                    anchor: 'bottom' 
                })
                .setLngLat([markerData.lng, markerData.lat]) // [Lng, Lat]
                .setPopup(new maplibregl.Popup({ offset: 25 }).setHTML(markerData.content)) // Popup
                .addTo(map);

                markers.push(markerInstance);
            });

            console.log(`✅ Marker berhasil ditampilkan: ${markers.length}`);
        })
        .catch(error => console.error('❌ Error fetching markers:', error));
}

// Entry Point: Ambil center dari API, lalu init map
window.onload = function() {
    fetch(`load/maps_marker.php?i=${topologiId}`)
        .then(res => res.json())
        .then(res => {
            if (res.status && res.centerlonglat) {
                console.log("📍 Init map pakai centerlonglat:", res.centerlonglat);
                initMap(res.centerlonglat);
            } else {
                console.warn("⚠️ Centerlonglat tidak ada, pakai fallback Jakarta");
                initMap({ lat: -6.2, lng: 106.816666 });
            }
        })
        .catch(err => {
            console.error("❌ Gagal ambil data awal:", err);
            initMap({ lat: -6.2, lng: 106.816666 }); // fallback
        });
};