//
//  LocationGeocoder.swift
//  suixinkan
//

import Foundation

/// 高德逆地理编码封装，对齐 Android `GeocodeSearch`。
final class LocationGeocoder: NSObject, AMapSearchDelegate {

    static let shared = LocationGeocoder()

    private var searchAPI: AMapSearchAPI?
    private var continuation: CheckedContinuation<String, Never>?

    private override init() {
        super.init()
    }

    /// 将坐标解析为可读地址。
    func reverseGeocode(latitude: Double, longitude: Double) async -> String {
        do {
            try AMapBootstrap.requireConfigured()
        } catch {
            return ""
        }

        return await withCheckedContinuation { continuation in
            self.continuation?.resume(returning: "")
            self.continuation = continuation

            guard let api = makeSearchAPI() else {
                continuation.resume(returning: "")
                return
            }
            let request = AMapReGeocodeSearchRequest()
            request.location = AMapGeoPoint.location(withLatitude: CGFloat(latitude), longitude: CGFloat(longitude))
            request.requireExtension = true
            request.radius = 200
            api.aMapReGoecodeSearch(request)
        }
    }

    func onReGeocodeSearchDone(_ request: AMapReGeocodeSearchRequest!, response: AMapReGeocodeSearchResponse!) {
        let address = response?.regeocode?.formattedAddress ?? ""
        continuation?.resume(returning: address)
        continuation = nil
    }

    func aMapSearchRequest(_ request: Any!, didFailWithError error: Error!) {
        continuation?.resume(returning: "")
        continuation = nil
    }

    private func makeSearchAPI() -> AMapSearchAPI? {
        if let searchAPI {
            return searchAPI
        }
        guard let api = AMapSearchAPI() else { return nil }
        api.delegate = self
        searchAPI = api
        return api
    }
}