Vue.component('tt-map', {
    props: {
        markersData: {
            type: Array,
            default: () => [] // Expecting [{ lat: Number, lng: Number, options: { maki?: Object, popup?: String, asyncPopupContent?: Function } }, ...]
        },
        config: {
            type: Object,
            default: () => ({}) // User overrides for defaults
        },
        loading: {
            type: Boolean,
            default: false
        }
    },
    data() {
        return {
            map: null,
            markerLayer: null,
            tileLayers: { streets: null, satellite: null },
            mapType: localStorage.getItem('tt-map-type') || 'streets', // Default to 'streets' or stored preference
            internalLoading: true,
            scriptsLoaded: false,
        };
    },
    computed: {
        isLoading() {
            return this.internalLoading || this.loading;
        },
        mapConfig() {
            const defaults = {
                center: [46.9, 15.4995],
                zoom: 11,
                mapboxKey: window.TT_CONFIG?.MAPBOX_KEY,
                streetsTileUrl: 'https://api.mapbox.com/styles/v1/{id}/tiles/{z}/{x}/{y}?access_token={accessToken}',
                streetsTileId: 'mapbox/streets-v11',
                satelliteTileUrl: 'https://api.mapbox.com/styles/v1/{id}/tiles/{z}/{x}/{y}?access_token={accessToken}',
                satelliteTileId: 'mapbox/satellite-streets-v12', // Or 'mapbox/satellite-v9'
                tileAttribution: '© <a href="https://www.mapbox.com/about/maps/">Mapbox</a> © <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a>',
                clusterOptions: {},
                makiMarkerOptions: { icon: "marker", color: "#3b82f6", size: "m" }
            };
            return { ...defaults, ...this.config }; // Merge user config over defaults
        }
    },
    async mounted() {
        try {
            await this.loadScripts();
            this.scriptsLoaded = true;
            this.initializeMap();
            this.updateMarkers();
            this.internalLoading = false;
        } catch (error) {
            console.error("Map Initialization Error:", error);
            this.internalLoading = false;
        }
    },
    methods: {
        loadScripts() {
            const scripts = [
                { type: 'link', url: 'https://unpkg.com/leaflet@1.9.4/dist/leaflet.css' },
                { type: 'script', url: 'https://unpkg.com/leaflet@1.9.4/dist/leaflet.js' },
                { type: 'script', url: 'https://unpkg.com/leaflet-makimarkers@3.1.0/Leaflet.MakiMarkers.js' },
                { type: 'link', url: 'https://unpkg.com/leaflet.markercluster@1.5.3/dist/MarkerCluster.css' },
                { type: 'link', url: 'https://unpkg.com/leaflet.markercluster@1.5.3/dist/MarkerCluster.Default.css' },
                { type: 'script', url: 'https://unpkg.com/leaflet.markercluster@1.5.3/dist/leaflet.markercluster.js' }
            ];

            const promises = scripts.map(s => new Promise((resolve, reject) => {
                let el;
                if (s.type === 'script') {
                    el = document.createElement('script');
                    el.src = s.url; el.async = false; el.onload = resolve; el.onerror = reject;
                } else {
                    el = document.createElement('link');
                    el.rel = 'stylesheet'; el.href = s.url; resolve();
                }
                if (el) document.head.appendChild(el); else reject();
            }));
            return Promise.all(promises);
        },
        initializeMap() {
            if (!this.scriptsLoaded || !L || !L.MarkerClusterGroup || !L.MakiMarkers || !this.mapConfig.mapboxKey) return;

            this.map = L.map(this.$refs.mapContainer, { preferCanvas: true }).setView(this.mapConfig.center, this.mapConfig.zoom);
            L.MakiMarkers.accessToken = this.mapConfig.mapboxKey;

            this.tileLayers.streets = L.tileLayer(this.mapConfig.streetsTileUrl, {
                attribution: this.mapConfig.tileAttribution, maxZoom: 18, id: this.mapConfig.streetsTileId,
                tileSize: 512, zoomOffset: -1, accessToken: this.mapConfig.mapboxKey
            });
            this.tileLayers.satellite = L.tileLayer(this.mapConfig.satelliteTileUrl, {
                attribution: this.mapConfig.tileAttribution, maxZoom: 18, id: this.mapConfig.satelliteTileId,
                tileSize: 512, zoomOffset: -1, accessToken: this.mapConfig.mapboxKey
            });

            this.tileLayers[this.mapType].addTo(this.map); // Add initial layer based on preference

            this.markerLayer = L.markerClusterGroup(this.mapConfig.clusterOptions);
            this.map.addLayer(this.markerLayer);

            // Invalidate size after initial load if container might not have been ready
            this.$nextTick(() => {
                this.map.invalidateSize();
            });
            // Add resize listener
            window.addEventListener('resize', this.handleResize);
        },
        updateMarkers() {
            if (!this.map || !this.markerLayer || !this.scriptsLoaded) return;
            this.markerLayer.clearLayers();
            const markersToAdd = [];
            this.markersData.forEach(data => {
                if (data.lat != null && data.lng != null) {
                    const makiOptions = { ...this.mapConfig.makiMarkerOptions, ...(data.options?.maki || {}) };
                    const icon = L.MakiMarkers.icon(makiOptions);
                    const marker = L.marker([data.lat, data.lng], { icon: icon });

                    if (data.options?.popup) {
                        marker.bindPopup(data.options.popup);
                    } else if (data.options?.asyncPopupContent && typeof data.options.asyncPopupContent === 'function') {
                        marker.bindPopup(() => '<div class="popup-loader">Loading...</div>'); // Initial content
                        marker.on('popupopen', async (e) => {
                            const popup = e.popup;
                            try {
                                const content = await data.options.asyncPopupContent(data); // Pass marker data to function
                                popup.setContent(content);
                            } catch (error) {
                                console.error("Error loading popup content:", error);
                                popup.setContent('<div class="text-danger">Failed to load content.</div>');
                            }
                            popup.update(); // Adjust size
                        });
                    }

                    if (data.options?.tooltip) marker.bindTooltip(data.options.tooltip);
                    markersToAdd.push(marker);
                }
            });
            if (markersToAdd.length > 0) this.markerLayer.addLayers(markersToAdd);
        },
        toggleMapType() {
            this.map.removeLayer(this.tileLayers[this.mapType]);
            this.mapType = this.mapType === 'streets' ? 'satellite' : 'streets';
            this.tileLayers[this.mapType].addTo(this.map);
            localStorage.setItem('tt-map-type', this.mapType);
        },
        handleResize() {
            if (this.map) {
                // Use debounce if resize events fire too rapidly
                this.map.invalidateSize();
            }
        }
    },
    watch: {
        markersData: { handler() { this.updateMarkers(); }, deep: true },
        loading(newVal) {
            // Optional: Invalidate map size when loading finishes, in case container size changed
            if (!newVal && this.map) {
                this.$nextTick(() => this.map.invalidateSize());
            }
        }
    },
    beforeDestroy() {
        window.removeEventListener('resize', this.handleResize);
        if (this.map) {
            this.map.remove();
            this.map = null;
        }
    },
    template: `
      <div style="position: relative; width: 100%; height: 100%;">
        <div v-if="isLoading" style="position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 1001; background: rgba(255,255,255,0.7); display: flex; justify-content: center; align-items: center;">
          <tt-loader></tt-loader>
        </div>
        <div ref="mapContainer" style="width: 100%; height: 100%; z-index: 1;" :style="{ visibility: internalLoading ? 'hidden' : 'visible' }"></div>
        <button @click="toggleMapType"
                class="btn btn-light btn-sm"
                style="position: absolute; top: 10px; right: 10px; z-index: 1000;">
          <i :class="mapType === 'streets' ? 'fas fa-globe-americas' : 'fas fa-map'"></i>
          {{ mapType === 'streets' ? 'Satellite' : 'Map' }}
        </button>
      </div>
    `
});