import { useState, useMemo, useCallback } from 'react';
import { Drawer } from 'vaul';
import { MapPin, PoundSterling } from 'lucide-react';
import { SwipeableCardRow } from './SwipeableCardRow';
import { ListView } from './ListView';
import type { GeoJSONFeatureCollection, PropertyProperties, PropertyFeature } from '@/types';

interface MobileBottomSheetProps {
    listingData: GeoJSONFeatureCollection | null;
    onPropertyClick?: (property: PropertyProperties, coordinates: [number, number]) => void;
    highlightedPropertyUrl?: string | null;
    onActiveListingChange?: (feature: PropertyFeature | null) => void;
    poiMetricSelection?: { poiId: number; travelMode: string } | null;
}

function formatCurrency(value: number): string {
    if (value >= 1000) return `£${(value / 1000).toFixed(1)}k`;
    return `£${Math.round(value)}`;
}

export function MobileBottomSheet({
    listingData,
    onPropertyClick,
    highlightedPropertyUrl,
    onActiveListingChange,
    poiMetricSelection,
}: MobileBottomSheetProps) {
    const [snap, setSnap] = useState<string | number | null>("148px");
    const [activeCardIndex, setActiveCardIndex] = useState(0);

    const features = listingData?.features ?? [];

    const stats = useMemo(() => {
        if (features.length === 0) return { count: 0, avgPrice: 0 };
        const validPrices = features
            .map((f) => f.properties.total_price)
            .filter((p): p is number => typeof p === 'number' && p > 0);
        const avgPrice = validPrices.length > 0
            ? validPrices.reduce((a, b) => a + b, 0) / validPrices.length
            : 0;
        return { count: features.length, avgPrice };
    }, [features]);

    const avgPricePerSqm = useMemo(() => {
        const validPrices = features
            .map((f) => f.properties.qmprice)
            .filter((p): p is number => typeof p === 'number' && p > 0);
        return validPrices.length > 0
            ? validPrices.reduce((a, b) => a + b, 0) / validPrices.length
            : 0;
    }, [features]);

    const handleActiveIndexChange = useCallback((index: number) => {
        setActiveCardIndex(index);
        if (features[index]) {
            onActiveListingChange?.(features[index]);
        }
    }, [features, onActiveListingChange]);

    const handleCardClick = useCallback((feature: PropertyFeature) => {
        window.open(feature.properties.url, '_blank', 'noopener,noreferrer');
        onPropertyClick?.(feature.properties, feature.geometry.coordinates);
    }, [onPropertyClick]);

    const isExpanded = snap === 0.85;

    return (
        <Drawer.Root
            open
            snapPoints={["80px", "148px", 0.85]}
            activeSnapPoint={snap}
            setActiveSnapPoint={setSnap}
            modal={false}
        >
            <Drawer.Portal>
                <Drawer.Content
                    className="fixed inset-x-0 bottom-0 z-40 flex flex-col rounded-t-xl bg-background border-t shadow-lg"
                    style={{ maxHeight: '85vh' }}
                >
                    <Drawer.Title className="sr-only">Property Listings</Drawer.Title>
                    {/* Drag handle */}
                    <div className="flex justify-center pt-2 pb-1">
                        <div className="h-1.5 w-10 rounded-full bg-muted-foreground/30" />
                    </div>

                    {/* Compact stats (always visible) */}
                    <div className="flex items-center gap-4 px-4 pb-2 text-sm text-muted-foreground">
                        <div className="flex items-center gap-1.5">
                            <MapPin className="h-4 w-4" />
                            <span className="font-medium text-foreground">{stats.count.toLocaleString()}</span>
                            <span>listings</span>
                        </div>
                        {stats.avgPrice > 0 && (
                            <div className="flex items-center gap-1.5">
                                <PoundSterling className="h-4 w-4" />
                                <span>Avg: <span className="font-medium text-foreground">{formatCurrency(stats.avgPrice)}</span></span>
                            </div>
                        )}
                    </div>

                    {/* Swipeable cards (visible at peek snap) */}
                    {!isExpanded && features.length > 0 && (
                        <SwipeableCardRow
                            features={features}
                            activeIndex={activeCardIndex}
                            onActiveIndexChange={handleActiveIndexChange}
                            avgPricePerSqm={avgPricePerSqm}
                            highlightedPropertyUrl={highlightedPropertyUrl}
                            onCardClick={handleCardClick}
                        />
                    )}

                    {/* Full list view (visible at expanded snap) */}
                    {isExpanded && listingData && features.length > 0 && (
                        <div className="flex-1 min-h-0 overflow-hidden">
                            <ListView
                                listingData={listingData}
                                onPropertyClick={onPropertyClick}
                                highlightedPropertyUrl={highlightedPropertyUrl}
                                poiMetricSelection={poiMetricSelection}
                            />
                        </div>
                    )}
                </Drawer.Content>
            </Drawer.Portal>
        </Drawer.Root>
    );
}