using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Android;
using System.Runtime.InteropServices;
using AOT;
public class GPSTool
{

#if UNITY_IPHONE
    static Action<string[]> callbackOut;
    [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
    public delegate void ResultHandler(string resultString);
    [MonoPInvokeCallback(typeof(ResultHandler))]
    static void resultHandler(string parameter)
    {
        //Debug.Log("unity parameter:" + parameter);
        string[] components = parameter.Split(new char[] { '\t' }, 6);
        string address = components[5];
        string[] addressOut = address.Split(new char[] { '\t' }, 3);
        callbackOut?.Invoke(addressOut);

        // 停止获取位置信息
        LocationPluginInterface.StopUpdatingLocation();
    }
#endif

    #if UNITY_ANDROID
    private static Action<string[]> callbackRecord;
    public static void OnLocationUpdate()
    {
        if (callbackRecord != null)
        {
            GetAddress(callbackRecord);
            callbackRecord = null;
        }
    }
    #endif
    //GPS获取地址
    //成功返回：string[]{国，省，市} (数组中不允许有null)
    //失败返回：null
    public static void GetAddress(Action<string[]> callback)
    {
#if UNITY_ANDROID
        Action callAndroidMethod = delegate ()
        {
            if (Application.isEditor) return;
            string[] address = null;
            using (var clsU3D = new AndroidJavaClass("com.unity3d.player.UnityPlayer"))
            using (var objCtx = clsU3D.GetStatic<AndroidJavaObject>("currentActivity"))
            using (var objGPSTool = new AndroidJavaClass("com.example.smartbowlib.GPSTool"))
            {
                bool gpsOpened = objGPSTool.CallStatic<bool>("hasOpenGPS", objCtx);    
                if (!gpsOpened)
                {
                    var view = OpenGPSView.Init();
                    if (view) view.onOpened = () => GetAddress(callback);
                    return;
                }         
                address = objGPSTool.CallStatic<string[]>("getAddress", objCtx);
                if (address != null)
                {
                    foreach (var item in address)
                    {
                        if (item == null)
                        {
                            address = null;
                            break;
                        }
                    }
                }
                if (address != null)
                {
                    Debug.Log("获取地理位置成功：" + string.Join(" ", address));
                    callback?.Invoke(address);
                }
                //如果安卓层未能获取到位置（比如gps刚打开），会等待gps更新，至到知道位置后，会通知Unity
                //因此可以先保留callback用于下次回调
                else if (address == null) callbackRecord = callback;
            }
        };
        List<string> permissions = new List<string>();
        permissions.Add(Permission.CoarseLocation);
        permissions.Add(Permission.FineLocation);
        for (int i = permissions.Count - 1; i >= 0; i--)
        {
            if (Permission.HasUserAuthorizedPermission(permissions[i])) permissions.RemoveAt(i);
        }
        if (permissions.Count > 0)
        {
            var requestCB = new PermissionCallbacks();
            int needPermissionCount = permissions.Count;
            requestCB.PermissionGranted += (s) =>
            {
                Debug.Log("用户同意" + s);
                needPermissionCount--;
                if (needPermissionCount == 0) callAndroidMethod.Invoke();
            };
            bool hasExecuteOnDenied = false;
            requestCB.PermissionDenied += (s) =>
            {
                Debug.Log("用户拒绝" + s);
                if (!hasExecuteOnDenied)
                {
                    hasExecuteOnDenied = true;
                    AlertNoPermission();
                }
            };
            requestCB.PermissionDeniedAndDontAskAgain += (s) =>
            {
                Debug.Log("用户拒绝且要求不再询问" + s);
                if (!hasExecuteOnDenied)
                {
                    hasExecuteOnDenied = true;
                    AlertNoPermission();
                }
            };
            Permission.RequestUserPermissions(permissions.ToArray(), requestCB);
        }
        else
        {
            callAndroidMethod.Invoke();
        }
#endif

#if UNITY_IPHONE
        callbackOut = callback;
        ResultHandler handler = new ResultHandler(resultHandler);
        IntPtr fp = Marshal.GetFunctionPointerForDelegate(handler);

        LocationPluginInterface.StartUpdatingLocation(fp);
#endif


    }

    //提示用户：尚未授予定位权限
    static void AlertNoPermission()
    {
        ModalManager.ShowConfirmModal_NoLocationPermission();
    }
}