using System.Collections;
using System.Collections.Generic;
using UnityEngine;

/// <summary>
/// Unity Bluetooth (Android)
/// https://github.com/JCxYIS/UnityBluetooth
/// </summary>
public class BluetoothManager
{
    private static AndroidJavaClass _javaClass;
    private static AndroidJavaObject _javaInstance = null;

    /* -------------------------------------------------------------------------- */

    [System.Serializable]
    public struct BluetoothDevice
    {
        public string name;
        public string mac;
    }

    /* -------------------------------------------------------------------------- */

    private static void EnsureInstance()
    {
        if (Application.platform != RuntimePlatform.Android)
        {
            throw new System.NotSupportedException("BluetoothManager currently only works on Android.");
        }

        if (_javaInstance == null)
        {
            // context = activity.Call<AndroidJavaObject>("getApplicationContext");
            _javaClass = new AndroidJavaClass("com.bonus.bdxt.BluetoothManager");
            //_javaClass = new AndroidJavaClass("im.shv.rtk.BluetoothManager");
            _javaInstance = _javaClass.CallStatic<AndroidJavaObject>("getInstance");
            Debug.Log("[BluetoothManager] Inited.");
        }
    }

    /* -------------------------------------------------------------------------- */

    /// <summary>
    /// Init permission.
    /// It is recommended to call this method in the first scene (before connect).
    /// </summary>
    public static void CheckPermission()
    {
        EnsureInstance();
        _javaInstance.Call("CheckPermission");
    }


    /// <summary>
    /// Start scanning nearby bluetooth devices
    /// </summary>
    public static void StartDiscovery()
    {
        EnsureInstance();
        _javaInstance.Call("StartDiscovery");
    }

    /// <summary>
    /// Get the list of nearby devices.
    /// Don't forget to call StartDiscovery() first!
    /// </summary>
    /// <returns>A string list. String form: <c>"{Name}|{MAC}"</c></returns>
    public static List<BluetoothDevice> GetAvailableDevices()
    {
        EnsureInstance();
        string[] devices = _javaInstance.Call<string[]>("GetAvailableDevices");
        List<BluetoothDevice> deviceList = new List<BluetoothDevice>();
        string[] deviceRawStr;
        for (int i = 0; i < devices.Length; i++)
        {
            deviceRawStr = devices[i].Split('|');
            deviceList.Add(new BluetoothDevice
            {
                name = deviceRawStr[0],
                mac = deviceRawStr[1]
            });
        }
        return deviceList;
    }

    /// <summary>
    /// Connect to a device with the specified address.
    /// </summary>
    /// <param name="mac">Address</param>
    /// <param name="pin">If the device hasn't been bonded and it has PIN, then this field is required.</param>
    /// <returns></returns>
    public static bool Connect(string mac, string pin = "")
    {
        EnsureInstance();
        return _javaInstance.Call<bool>("Connect", mac, pin);
    }

    /// <summary>
    /// Is Connected?
    /// </summary>
    public static bool IsConnected()
    {
        EnsureInstance();
        return _javaInstance.Call<bool>("IsConnected");
    }

    /// <summary>
    /// Get connected device, if no device is connected, return "|".
    /// </summary>
    /// <returns>{NAME}|{MAC}</returns>
    public static string GetConnectedDevice()
    {
        EnsureInstance();
        return _javaInstance.Call<string>("GetConnectedDevice");
    }

    /// <summary>
    /// Send data to the remote device.
    /// You need to append newline (e.g. '\n' or '\r\n') by yourself.
    /// </summary>
    /// <param name="data"></param>
    /// <returns></returns>    
    public static bool Send(string data)
    {
        EnsureInstance();
        return _javaInstance.Call<bool>("Send", data);
    }

    /// <summary>
    /// Input stream buffer size
    /// </summary>
    /// <returns>Negative value means not connected or error</returns>
    public static int Available()
    {
        return _javaInstance.Call<int>("Available");
    }

    /// <summary>
    /// Read a line from input stream
    /// </summary>
    /// <returns></returns>
    public static string ReadLine()
    {
        EnsureInstance();
        return _javaInstance.Call<string>("ReadLine");
    }

    /// <summary>
    /// Stop the connection
    /// </summary>
    public static void Stop()
    {
        EnsureInstance();
        _javaInstance.Call("Stop");
    }

    /* -------------------------------------------------------------------------- */

    /// <summary>
    /// Show a Toast (bottom message)
    /// </summary>
    public static void Toast(string msg)
    {
        EnsureInstance();
        _javaClass.CallStatic("Toast", msg);
    }

    /* -------------------------------------------------------------------------- */

    public static string[] StrArrTest(int len)
    {
        EnsureInstance();
        return _javaInstance.Call<string[]>("StrArrTest", len);
    }
}