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

public class Demo : MonoBehaviour
{
    private BluetoothHelper helper;
    private bool isScanning;
    private bool isConnecting;

    private string data;

    private string tmp;

    private LinkedList<BluetoothDevice> devices;
    // Start is called before the first frame update
    void Start()
    {
        data = "";
        tmp = "";
        try{
            BluetoothHelper.BLE = false;
            helper = BluetoothHelper.GetInstance();
            helper.OnConnected += OnConnected;
            helper.OnConnectionFailed += OnConnectionFailed;
            helper.OnScanEnded += OnScanEnded;
            helper.OnDataReceived += OnDataReceived;

            helper.setCustomStreamManager(new MyStreamManager()); //implement your own way of delimiting the messages
            //helper.setTerminatorBasedStream("\n"); //every messages ends with new line character

        }catch(Exception e){
            Debug.LogError(e);
        }
        
    }

    void OnDataReceived(BluetoothHelper helper){
        data += "\n<" + helper.Read();
    }

    void OnScanEnded(BluetoothHelper helper, LinkedList<BluetoothDevice> devices){
        this.isScanning = false;
        this.devices = devices;
    }

    void OnConnected(BluetoothHelper helper){
        isConnecting=false;
        helper.StartListening();
    }

    void OnConnectionFailed(BluetoothHelper helper){
        isConnecting = false;
        Debug.Log("Connection lost");
    }


    void OnGUI(){

        if(helper == null)
            return;
        if(!helper.isConnected() && !isScanning && !isConnecting){
            if (GUI.Button(new Rect(Screen.width / 2 - Screen.width / 10, Screen.height / 10, Screen.width / 5, Screen.height / 10), "Start Scanning")){
                isScanning = helper.ScanNearbyDevices();
            }
            if(devices != null && devices.First != null) {
                draw();
            }
        }else if(!helper.isConnected() && isScanning){
            GUI.TextArea(new Rect(Screen.width / 2 - Screen.width / 10, Screen.height / 10, Screen.width / 5, Screen.height / 10), "Scanning...");
        }else if(helper.isConnected()){

            GUI.TextArea(new Rect(Screen.width / 4, 2 * Screen.height / 10, Screen.width / 2, 7*Screen.height / 10), data);
            tmp = GUI.TextField(new Rect(Screen.width / 4, Screen.height / 10, Screen.width / 2, Screen.height / 10 - 10), tmp);
            if (GUI.Button(new Rect( 3 * Screen.width / 4 + 10, Screen.height / 10, Screen.width / 5, Screen.height / 10), "Send"))
            {
                helper.SendData(tmp);
                data += "\n>"+tmp;
                tmp = "";
            }
            if (GUI.Button(new Rect(3 * Screen.width / 4 + 10, 8 * Screen.height / 10, Screen.width / 5, Screen.height / 10), "Disconnect"))
            {
                helper.Disconnect();
            }
        }
    }

    private void draw(){
        LinkedListNode<BluetoothDevice> node = devices.First;
        for (int i = 0; i < 9; i++)
        {
            for (int j = 0; j < 3; j++)
            {
                string bluetoothName = node.Value.DeviceName;
                if (GUI.Button(new Rect((j + 1) * Screen.width / 5 + 5, (i + 2) * Screen.height / 10 + 5, Screen.width / 5 - 10, Screen.height / 10 - 10), bluetoothName + " - " + node.Value.Rssi))
                {
                    helper.setDeviceName(bluetoothName);
                    try{
                        helper.Connect();
                        isConnecting = true;
                    }catch(Exception){
                        isConnecting = false;
                    }
                }
                node = node.Next;
                if (node == null)
                    return;
            }
        }
    }

    void OnDestroy(){
        if(helper != null)
            helper.Disconnect();
    }
}