/**
 * Google Maps GeoJSON parser for rMaps place import.
 * Ported from rmaps-online/src/lib/googleMapsParser.ts (pure TS, no React deps).
 */

export interface ParsedPlace {
	name: string;
	lat: number;
	lng: number;
	address?: string;
	category?: string;
}

export interface ParseResult {
	success: boolean;
	places: ParsedPlace[];
	error?: string;
	totalFeatures: number;
}

const MAX_FILE_SIZE = 50 * 1024 * 1024; // 50 MB

/**
 * Parse a Google Maps GeoJSON export into a list of places.
 * Accepts standard GeoJSON FeatureCollection with Point features.
 */
export function parseGoogleMapsGeoJSON(jsonStr: string): ParseResult {
	if (jsonStr.length > MAX_FILE_SIZE) {
		return { success: false, places: [], error: "File too large (max 50 MB)", totalFeatures: 0 };
	}

	let data: any;
	try {
		data = JSON.parse(jsonStr);
	} catch {
		return { success: false, places: [], error: "Invalid JSON", totalFeatures: 0 };
	}

	if (!data || data.type !== "FeatureCollection" || !Array.isArray(data.features)) {
		return { success: false, places: [], error: "Not a valid GeoJSON FeatureCollection", totalFeatures: 0 };
	}

	const places: ParsedPlace[] = [];

	for (const feature of data.features) {
		if (!feature?.geometry || feature.geometry.type !== "Point") continue;

		const coords = feature.geometry.coordinates;
		if (!Array.isArray(coords) || coords.length < 2) continue;

		const lng = coords[0];
		const lat = coords[1];

		// Validate coordinates
		if (typeof lat !== "number" || typeof lng !== "number") continue;
		if (lat < -90 || lat > 90 || lng < -180 || lng > 180) continue;
		if (isNaN(lat) || isNaN(lng)) continue;

		// Extract name from various properties formats
		const props = feature.properties || {};
		const name =
			props.name ||
			props.Name ||
			props.title ||
			props.Title ||
			props["Google Maps URL"]?.split("/place/")?.pop()?.split("/")?.[0]?.replace(/\+/g, " ") ||
			`Place at ${lat.toFixed(4)}, ${lng.toFixed(4)}`;

		places.push({
			name: String(name).substring(0, 200),
			lat,
			lng,
			address: props.address || props.Address || props.description || undefined,
			category: props.category || props.Category || undefined,
		});
	}

	return {
		success: places.length > 0,
		places,
		totalFeatures: data.features.length,
		...(places.length === 0 ? { error: "No valid Point features found" } : {}),
	};
}