import Foundation

public struct InlqGeocodingPlace: Codable {
    public let id: String
    public let name: String
    public let nameAr: String?
    public let nameEn: String?
    public let category: String?
    public let city: String?
    public let neighbourhood: String?
    public let address: String?
    public let position: InlqLatLng
}

/**
 * Commercial Geocoding & Reverse Geocoding Service calling Intaleq SaaS API on iOS (Swift).
 */
public class IntaleqGeocodingService {

    public static let shared = IntaleqGeocodingService()

    private init() {}

    /**
     * Search for places, addresses, and POIs by text query.
     */
    public func search(
        query: String,
        proximity: InlqLatLng? = nil,
        limit: Int = 10,
        completion: @escaping (Result<[InlqGeocodingPlace], Error>) -> Void
    ) {
        guard let encoded = query.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) else {
            completion(.failure(NSError(domain: "IntaleqMaps", code: -1, userInfo: [NSLocalizedDescriptionKey: "Invalid query"])))
            return
        }

        var urlStr = "\(IntaleqMaps.shared.baseUrl)/api/geocoding/search?q=\(encoded)&limit=\(limit)"
        if let proximity = proximity {
            urlStr += "&lat=\(proximity.latitude)&lng=\(proximity.longitude)"
        }

        guard let url = URL(string: urlStr) else {
            completion(.failure(NSError(domain: "IntaleqMaps", code: -1, userInfo: [NSLocalizedDescriptionKey: "Invalid URL"])))
            return
        }

        var request = URLRequest(url: url)
        request.httpMethod = "GET"
        request.setValue(IntaleqMaps.shared.apiKey, forHTTPHeaderField: "x-api-key")
        request.setValue("application/json", forHTTPHeaderField: "Accept")

        URLSession.shared.dataTask(with: request) { data, _, error in
            if let error = error {
                completion(.failure(error))
                return
            }

            guard let data = data else {
                completion(.success([]))
                return
            }

            do {
                if let json = try JSONSerialization.jsonObject(with: data) as? [String: Any],
                   let features = json["features"] as? [[String: Any]] {

                    let places: [InlqGeocodingPlace] = features.compactMap { f in
                        guard let geom = f["geometry"] as? [String: Any],
                              let coords = geom["coordinates"] as? [Double],
                              coords.count >= 2 else { return nil }

                        let props = f["properties"] as? [String: Any] ?? [:]
                        return InlqGeocodingPlace(
                            id: f["id"] as? String ?? UUID().uuidString,
                            name: props["name"] as? String ?? "موقع محدد",
                            nameAr: props["name_ar"] as? String,
                            nameEn: props["name_en"] as? String,
                            category: props["category"] as? String,
                            city: props["city"] as? String,
                            neighbourhood: props["neighbourhood"] as? String,
                            address: props["address"] as? String,
                            position: InlqLatLng(latitude: coords[1], longitude: coords[0])
                        )
                    }
                    completion(.success(places))
                } else {
                    completion(.success([]))
                }
            } catch {
                completion(.failure(error))
            }
        }.resume()
    }

    /**
     * Reverse geocode coordinate to get street and neighborhood name.
     */
    public func reverseGeocode(
        position: InlqLatLng,
        completion: @escaping (Result<InlqGeocodingPlace?, Error>) -> Void
    ) {
        let urlStr = "\(IntaleqMaps.shared.baseUrl)/api/geocoding/reverse?lat=\(position.latitude)&lng=\(position.longitude)"
        guard let url = URL(string: urlStr) else {
            completion(.failure(NSError(domain: "IntaleqMaps", code: -1, userInfo: [NSLocalizedDescriptionKey: "Invalid URL"])))
            return
        }

        var request = URLRequest(url: url)
        request.httpMethod = "GET"
        request.setValue(IntaleqMaps.shared.apiKey, forHTTPHeaderField: "x-api-key")
        request.setValue("application/json", forHTTPHeaderField: "Accept")

        URLSession.shared.dataTask(with: request) { data, _, error in
            if let error = error {
                completion(.failure(error))
                return
            }

            guard let data = data else {
                completion(.success(nil))
                return
            }

            do {
                if let json = try JSONSerialization.jsonObject(with: data) as? [String: Any],
                   let features = json["features"] as? [[String: Any]], let first = features.first,
                   let geom = first["geometry"] as? [String: Any],
                   let coords = geom["coordinates"] as? [Double], coords.count >= 2 {

                    let props = first["properties"] as? [String: Any] ?? [:]
                    let place = InlqGeocodingPlace(
                        id: first["id"] as? String ?? UUID().uuidString,
                        name: props["name"] as? String ?? "موقع محدد",
                        nameAr: props["name_ar"] as? String,
                        nameEn: props["name_en"] as? String,
                        category: props["category"] as? String,
                        city: props["city"] as? String,
                        neighbourhood: props["neighbourhood"] as? String,
                        address: props["address"] as? String,
                        position: InlqLatLng(latitude: coords[1], longitude: coords[0])
                    )
                    completion(.success(place))
                } else {
                    completion(.success(nil))
                }
            } catch {
                completion(.failure(error))
            }
        }.resume()
    }
}