/**
 * Cut Drawing Module
 * Handles polygon drawing functionality for creating map cuts
 */

export class CutDrawing {
    constructor(map, options = {}) {
        this.map = map;
        this.vertices = [];
        this.markers = [];
        this.polyline = null;
        this.previewPolygon = null; // Add preview polygon
        this.isDrawing = false;
        this.onComplete = options.onComplete || null;
    }
    
    /**
     * Start drawing mode
     */
    startDrawing(onFinish, onCancel) {
        if (this.isDrawing) {
            this.cancelDrawing();
        }
        
        this.isDrawing = true;
        this.onFinishCallback = onFinish;
        this.onCancelCallback = onCancel;
        this.vertices = [];
        this.markers = [];
        
        // Change cursor and add click listener
        this.map.getContainer().style.cursor = 'crosshair';
        this.map.on('click', this.onMapClick.bind(this));
        
        // Disable double-click zoom while drawing
        this.map.doubleClickZoom.disable();
        
        console.log('Cut drawing started - click to add points');
    }
    
    /**
     * Handle map clicks to add vertices
     */
    onMapClick(e) {
        if (!this.isDrawing) return;
        
        // Add vertex marker
        const marker = L.marker(e.latlng, {
            icon: L.divIcon({
                className: 'cut-vertex-marker',
                html: '<div class="vertex-point"></div>',
                iconSize: [12, 12],
                iconAnchor: [6, 6]
            }),
            draggable: false
        }).addTo(this.map);
        
        this.vertices.push(e.latlng);
        this.markers.push(marker);
        
        // Update the polyline
        this.updatePolyline();
        
        // Call update callback if available
        if (this.onUpdate) {
            this.onUpdate();
        }
        
        console.log(`Added vertex ${this.vertices.length} at`, e.latlng);
    }
    
    /**
     * Update the polyline connecting vertices
     */
    updatePolyline() {
        // Remove existing polyline
        if (this.polyline) {
            this.map.removeLayer(this.polyline);
        }
        
        if (this.vertices.length > 1) {
            // Create polyline connecting all vertices
            this.polyline = L.polyline(this.vertices, {
                color: '#3388ff',
                weight: 2,
                dashArray: '5, 5',
                opacity: 0.8
            }).addTo(this.map);
        }
    }
    
    /**
     * Finish drawing and create polygon
     */
    finishDrawing() {
        if (this.vertices.length < 3) {
            alert('A cut must have at least 3 points');
            return;
        }

        // Create the polygon
        const latlngs = this.vertices.map(v => v.getLatLng());
        
        // Close the polygon
        latlngs.push(latlngs[0]);
        
        // Generate GeoJSON
        const geojson = {
            type: 'Polygon',
            coordinates: [latlngs.map(ll => [ll.lng, ll.lat])]
        };
        
        // Calculate bounds
        const bounds = {
            north: Math.max(...latlngs.map(ll => ll.lat)),
            south: Math.min(...latlngs.map(ll => ll.lat)),
            east: Math.max(...latlngs.map(ll => ll.lng)),
            west: Math.min(...latlngs.map(ll => ll.lng))
        };
        
        console.log('Cut drawing finished with', this.vertices.length, 'vertices');
        
        // Show preview before clearing drawing
        const color = document.getElementById('cut-color')?.value || '#3388ff';
        const opacity = parseFloat(document.getElementById('cut-opacity')?.value) || 0.3;
        this.showPreview(geojson, color, opacity);
        
        // Clean up drawing elements
        this.clearDrawing();
        
        // Call completion callback with the data
        if (this.onComplete && typeof this.onComplete === 'function') {
            console.log('Calling completion callback with geojson and bounds');
            this.onComplete(geojson, bounds);
        } else {
            console.error('No completion callback defined');
        }
        
        // Reset state
        this.isDrawing = false;
        this.updateToolbar();
    }
    
    /**
     * Cancel drawing
     */
    cancelDrawing() {
        if (!this.isDrawing) return;
        
        console.log('Cut drawing cancelled');
        this.cleanup();
        
        if (this.onCancelCallback) {
            this.onCancelCallback();
        }
    }
    
    /**
     * Remove the last added vertex
     */
    undoLastVertex() {
        if (!this.isDrawing || this.vertices.length === 0) return;
        
        // Remove last vertex and marker
        this.vertices.pop();
        const lastMarker = this.markers.pop();
        if (lastMarker) {
            this.map.removeLayer(lastMarker);
        }
        
        // Update polyline
        this.updatePolyline();
        
        // Call update callback if available
        if (this.onUpdate) {
            this.onUpdate();
        }
        
        console.log('Removed last vertex, remaining:', this.vertices.length);
    }
    
    /**
     * Clear all vertices and start over
     */
    clearVertices() {
        if (!this.isDrawing) return;
        
        // Remove all markers
        this.markers.forEach(marker => {
            this.map.removeLayer(marker);
        });
        
        // Remove polyline
        if (this.polyline) {
            this.map.removeLayer(this.polyline);
            this.polyline = null;
        }
        
        // Reset arrays
        this.vertices = [];
        this.markers = [];
        
        // Call update callback if available
        if (this.onUpdate) {
            this.onUpdate();
        }
        
        console.log('Cleared all vertices');
    }
    
    /**
     * Cleanup drawing state
     */
    cleanup() {
        // Remove all markers
        this.markers.forEach(marker => {
            this.map.removeLayer(marker);
        });
        
        // Remove polyline
        if (this.polyline) {
            this.map.removeLayer(this.polyline);
        }
        
        // Reset cursor
        this.map.getContainer().style.cursor = '';
        
        // Remove event listeners
        this.map.off('click', this.onMapClick);
        
        // Re-enable double-click zoom
        this.map.doubleClickZoom.enable();
        
        // Reset state
        this.isDrawing = false;
        this.vertices = [];
        this.markers = [];
        this.polyline = null;
        this.onFinishCallback = null;
        this.onCancelCallback = null;
    }
    
    /**
     * Get current drawing state
     */
    getState() {
        return {
            isDrawing: this.isDrawing,
            vertexCount: this.vertices.length,
            canFinish: this.vertices.length >= 3
        };
    }
    
    /**
     * Preview polygon without finishing
     */
    showPreview(geojson, color = '#3388ff', opacity = 0.3) {
        this.clearPreview();
        
        if (!geojson) return;
        
        try {
            const coordinates = geojson.coordinates[0];
            const latlngs = coordinates.map(coord => L.latLng(coord[1], coord[0]));
            
            this.previewPolygon = L.polygon(latlngs, {
                color: color,
                weight: 2,
                opacity: 0.8,
                fillColor: color,
                fillOpacity: opacity,
                className: 'cut-preview-polygon'
            }).addTo(this.map);
            
            // Add CSS class for opacity control
            const pathElement = this.previewPolygon.getElement();
            if (pathElement) {
                pathElement.classList.add('cut-polygon');
                console.log('Added cut-polygon class to preview polygon');
            }
            
            console.log('Preview polygon shown with opacity:', opacity);
        } catch (error) {
            console.error('Error showing preview polygon:', error);
        }
    }
    
    /**
     * Update preview polygon style without recreating it
     */
    updatePreview(color = '#3388ff', opacity = 0.3) {
        if (this.previewPolygon) {
            this.previewPolygon.setStyle({
                color: color,
                weight: 2,
                opacity: 0.8,
                fillColor: color,
                fillOpacity: opacity
            });
            
            // Ensure CSS class is still present
            const pathElement = this.previewPolygon.getElement();
            if (pathElement) {
                pathElement.classList.add('cut-polygon');
            }
            
            console.log('Preview polygon style updated with opacity:', opacity);
        }
    }
    
    clearPreview() {
        if (this.previewPolygon) {
            this.map.removeLayer(this.previewPolygon);
            this.previewPolygon = null;
        }
    }
    
    /**
     * Update drawing style (called from admin cuts manager)
     */
    updateDrawingStyle(color = '#3388ff', opacity = 0.3) {
        // Update the polyline connecting vertices if it exists
        if (this.polyline) {
            this.polyline.setStyle({
                color: color,
                weight: 2,
                opacity: 0.8
            });
        }
        
        // Update preview polygon if it exists
        this.updatePreview(color, opacity);
        
        console.log('Cut drawing style updated with color:', color, 'opacity:', opacity);
    }
}