using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Sockets;
using UnityEngine;

using UnityEditor;

namespace FreeD 
{

    [ExecuteInEditMode]
    public class FreeDSimulator : MonoBehaviour
    {
        [Header("Sending to destination")]
        public string destinationIp = "127.0.0.1";
        public int destinationPort = 40_000;
        public bool active = true;

        [Header("Setup")]
        public int cameraId = 0;
        public Camera physicalCamera;
        private Transform target;

        [Tooltip("Run the server in edit mode")]
        public new bool runInEditMode = true;
        [Tooltip("Show received messages in Unity console")]
        public bool showPacketInConsole = true;

        public PacketSent sent;

        // Communication setup
        UdpClient listener;
        IPEndPoint groupEP;
        Packet packet;

        public delegate void PacketSent(Packet packet);

        public void OnEnable() 
        {
            if (!Application.isPlaying && !runInEditMode) return;

            listener = new UdpClient(destinationIp, destinationPort);
            groupEP = new IPEndPoint(IPAddress.Parse(destinationIp), destinationPort);

            physicalCamera = GetComponent<Camera>();
            target = physicalCamera.gameObject.transform;
            
            active = true;
        }

        private void OnDisable()
        {
            Stop();
        }

        public void Update()
        {
            if (!Application.isPlaying && !runInEditMode) return;
            if (!active) return;

            try
            {
                packet = new Packet();

                // Mathematical transformations according to `FreeDLink.cs`
                packet.Id = cameraId;
                packet.Pan = target.transform.localRotation.eulerAngles.y;      // degrees
                packet.Tilt = -target.transform.localRotation.eulerAngles.x;
                packet.Roll = -target.transform.localRotation.eulerAngles.z;
                packet.PosZ = -target.transform.localPosition.z * 1000f;        // millimeters
                packet.PosX = target.transform.localPosition.x * 1000f;
                packet.PosY = target.transform.localPosition.y * 1000f;

                if(physicalCamera != null)
                {
                    // Original value FreeD is between [0-4095], but values in the Virtual Studio Labs are between [21-63]
                    packet.Zoom = physicalCamera.fieldOfView * ((19f-169f)/(63f-21f));
                    packet.Focus = -physicalCamera.focusDistance * 1000f;      // Value between 0-4095
                }
                else
                {
                    packet.Zoom = 0.5f;
                    packet.Focus = -800f;
                }    

                try
                {
                    var binary_packet = Packet.Encode(packet);
                    var result = listener.Send(binary_packet, binary_packet.Length);
                    if(sent != null) sent(packet);

                    if(showPacketInConsole)
                        Debug.Log($"Camera ID {packet.Id} sending: {packet.Id},{packet.Pan},{packet.Tilt},{packet.Roll},{packet.PosZ},{packet.PosX},{packet.PosY},{packet.Zoom},{packet.Focus}");
                }
                catch(Exception e)
                {
                    Debug.LogError(e);
                }
            }
            catch (SocketException e)
            {
                Debug.LogError(e);
            }
        }

        public void Stop() 
        {
            active = false;
            listener.Close();
        }
    }


#if UNITY_EDITOR
    [CustomEditor(typeof(FreeDSimulator))]
    public class FreeDSimulatorEditor : Editor
    {
        public override void OnInspectorGUI()
        {

            FreeDSimulator myScript = (FreeDSimulator)target;

            if(myScript.active)
            {
                if (GUILayout.Button($"Stop Simulation Camera ID {myScript.cameraId}"))
                    myScript.enabled = false;
            }
            else
            {
                if (GUILayout.Button($"Start Simulation Camera ID {myScript.cameraId}"))
                    myScript.enabled = true;
            }    

            DrawDefaultInspector();
        }
    }
#endif
}