//
//  MapViewModel.swift
//  Runner
//
//  Created by Groot on 2025/5/7.
//

import Flutter
import Foundation
import MapKit
import CoreLocation
import SwiftUI
import Combine

private let coordinates: [CLLocationCoordinate2D] = [
    CLLocationCoordinate2D(latitude: 39.90333, longitude: 116.39167), // 北京
    CLLocationCoordinate2D(latitude: 31.23170, longitude: 121.47264), // 上海
    CLLocationCoordinate2D(latitude: 22.54554, longitude: 114.05786), // 深圳
    CLLocationCoordinate2D(latitude: 23.12911, longitude: 113.26437), // 广州
    CLLocationCoordinate2D(latitude: 30.59276, longitude: 114.30525), // 武汉
]

class MapViewModel: NSObject, ObservableObject, MapCapability {

    var paramsDecodeError: FlutterError? = FlutterError(code: "InvalidArguments", message: "Invalid arguments", details: nil)

    var methodChannel: FlutterMethodChannel?

    @Published var currentRegion: MKCoordinateRegion?
    
    // 记录用户位置
    @Published var userLocation: CLLocationCoordinate2D?

    // 地图Marker
    @Published var markers: [ATMapMarker] = []
    
    // 地图Polyline
    @Published var polylines: [ATMapPolyline] = []

    // 处理地图移动
    func handleMapMoveCamera(args: [String: Any]?, result: @escaping FlutterResult) {
        guard let args = args, let cameraPosition = ATMapCameraPosition.fromJson(json: args) else {
            result(paramsDecodeError)
            return
        }
        
        let center = CLLocationCoordinate2D(latitude: cameraPosition.latitude, longitude: cameraPosition.longitude)
        let span = MKCoordinateSpan(latitudeDelta: cameraPosition.zoom, longitudeDelta: cameraPosition.zoom)
        
        currentRegion = MKCoordinateRegion(center: center, span: span)
        result(nil)
    }

    // 处理地图添加Marker
    func handleMapAddMarker(args: [String: Any]?, result: @escaping FlutterResult) {
        guard let args = args, let marker = ATMapMarker.fromJson(json: args) else {
            result(paramsDecodeError)
            return
        }

        // 检查是否已存在相同ID的标记，如果有则先移除
        if let index = markers.firstIndex(where: { $0.id == marker.id }) {
            markers.remove(at: index)
        }
        
        markers.append(marker)
        result(nil)
    }

    // 处理地图清除Marker
    func handleMapClearMarkers(result: @escaping FlutterResult) {
        markers = []
        result(nil)
    }

    // 处理地图替换所有Marker
    func handleMapReplaceAllMarkers(args: [String: Any]?, result: @escaping FlutterResult) {
        defer {
            result(nil)
        }
        guard let args = args, let markers = args["markers"] as? [[String: Any]] else {
            result(paramsDecodeError)
            return
        }

        let mapMarkers = markers.compactMap({ ATMapMarker.fromJson(json: $0) })

        self.markers = mapMarkers
    }

    // 处理Marker点击事件
    func handleMarkerTap(marker: inout ATMapMarker) {
        toggleMarkerSelected(marker: &marker)
        methodChannel?.invokeMethod(ChannelMethods.methodMarkerOnTap.rawValue, arguments: marker.toJson())
    }

    // 处理地图添加Polyline
    func handleMapAddPolyline(args: [String: Any]?, result: @escaping FlutterResult) {
        guard let args = args, let pointsArray = args["points"] as? [[String: Any]] else {
            result(paramsDecodeError)
            return
        }
        let coordinates = pointsArray.compactMap({ CLLocationCoordinate2D.fromJson(json: $0) })
        let polyline = ATMapPolyline(points: coordinates)
        polylines.append(polyline)

        result(nil)
    }
}   

// Propertie Action
extension MapViewModel {
    func toggleMarkerSelected(marker: inout ATMapMarker) {
        marker.isSelected = !marker.isSelected
    }
}