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


/* Traffic controller
 * Felelős a forgalom irányításáért és a forgalom figyeléséért.
 * 
 * Az autók innen kérdezik le, hogy adott kereszteződésből merre lehet menni a lámpa szerint, illetve van-e még hely
 * az adott úton. 
 * 
 * Autókat spawnol (és színez is).
 * 
 * Lekérdezi a lámpák állapotát.
 * Jegyzi a várakozó autók számát és elüldi a megfelelő szervernek.
 * 
 * Csak szerveroldalon fut.
 */

//Nem kell SyncVar-ral foglalkoznia a UNET-nek
[NetworkSettings(channel = 0, sendInterval = 0)]
public class TrafficController : NetworkBehaviour {

	[Header("Network setup")]
	public string url = "http://localhost:8080/";
	public string getURI = "/trafficLights/";
	public string putRoadsURI = "/roads/";
	public string putCarCountURI = "/passedCarCount";

	[Header("Road setup")]
	public Road[] roads = new Road[16];
	public List<CrossroadUnity> crossroadsUnity;
	public TrafficLights trafficLights;

	[Header("Misc setup")]
	public GameObject carPrefab;
	public List<Color> carColors;
	public carCount carCounter;
	//ezek roadID-k
	public int[] spawnPosition = { 0, 1, 5, 6, 10, 11, 15, 12 };
	public float updateInterval = 1;
	public float spawnInterval = 0.5f;

	private float timePassedUpdate = 0;
	private float timePassedSpawn = 0;
	private int current = 0;

	public override void OnStartServer () {
		base.OnStartServer();
		url = url.TrimEnd('/');

		trafficLights = new TrafficLights();

		StartCoroutine("getState");
	}
	
	void Update () {
		if (!isServer) return;

		timePassedUpdate += Time.deltaTime;
		if (timePassedUpdate >= updateInterval)
		{
			StartCoroutine("getState");
			StartCoroutine("putRoads");
			StartCoroutine("putCarCount");

			timePassedUpdate = 0;
		}

		timePassedSpawn += Time.deltaTime;
		if (timePassedSpawn >= spawnInterval)
		{
			spawnCar(spawnPosition[current++]);
			current %= spawnPosition.Length;
			timePassedSpawn = 0;
		}
	}


	IEnumerator getState ()
	{
		using (WWW www = new WWW(url + getURI))
		{
			yield return www;

			trafficLights.roadSystem = JsonUtility.FromJson<RoadSystem>(www.text);

			for (int i = 0; i < 4; i++)
			{
				crossroadsUnity[i].colors.RpcUpdateColors(trafficLights[i].N, trafficLights[i].E, trafficLights[i].S, trafficLights[i].W);

				trafficLights.isWithoutLights[i] = !(trafficLights[i].N != "off" && trafficLights[i].E != "off" && trafficLights[i].S != "off" && trafficLights[i].W != "off");
			}

		}
	}

	IEnumerator putRoads ()
	{
		string roadStates = "{ \"NW\": { \"W\":" +  roads[0].carCount.ToString() +
									   ",\"N\":" +  roads[1].carCount.ToString() +
									   ",\"E\":" +  roads[2].carCount.ToString() +
									   ",\"S\":" +  roads[3].carCount.ToString() +
									   "}" +
							", \"NE\": { \"W\":" +  roads[4].carCount.ToString() +
									   ",\"N\":" +  roads[5].carCount.ToString() +
									   ",\"E\":" +  roads[6].carCount.ToString() +
									   ",\"S\":" +  roads[7].carCount.ToString() +
									   "}" +
							", \"SE\": { \"W\":" +  roads[8].carCount.ToString() +
									   ",\"N\":" +  roads[9].carCount.ToString() +
									   ",\"E\":" + roads[10].carCount.ToString() +
									   ",\"S\":" + roads[11].carCount.ToString() +
									   "}" +
							", \"SW\": { \"W\":" + roads[12].carCount.ToString() +
									   ",\"N\":" + roads[13].carCount.ToString() +
									   ",\"E\":" + roads[14].carCount.ToString() +
									   ",\"S\":" + roads[15].carCount.ToString() +
									   "}" + 
							"}";


		byte[] data = System.Text.Encoding.UTF8.GetBytes(roadStates);
		UnityWebRequest www = UnityWebRequest.Put(url + putRoadsURI, data);
		yield return www.SendWebRequest();

		if (www.isNetworkError || www.isHttpError)
		{
			Debug.Log(www.error);
		}
	}

	IEnumerator putCarCount ()
	{
		byte[] data = System.Text.Encoding.UTF8.GetBytes(carCounter.throughput.ToString());
		UnityWebRequest www = UnityWebRequest.Put(url + putCarCountURI, data);
		yield return www.SendWebRequest();

		if (www.isNetworkError || www.isHttpError)
		{
			Debug.Log(www.error);
		}
	}

	//Beállítja a hívó autó next roadId-jét és megmondja, mehet-e a lámpa alapján.
	public bool getInfo(int index, string direction, ref int forwardRoadID, ref int rightRoadID)
	{
		bool canGo = trafficLights.canGo(index);
		switch (direction)
		{
			case "North":
				forwardRoadID = crossroadsUnity[index].southNextRoadID;
				rightRoadID = crossroadsUnity[index].westNextRoadID;
				return trafficLights[index].N == "green" || canGo;
			case "East":
				forwardRoadID = crossroadsUnity[index].westNextRoadID;
				rightRoadID = crossroadsUnity[index].northNextRoadID;
				return trafficLights[index].E == "green" || canGo;
			case "South":
				forwardRoadID = crossroadsUnity[index].northNextRoadID;
				rightRoadID = crossroadsUnity[index].eastNextRoadID;
				return trafficLights[index].S == "green" || canGo;
			case "West":
				forwardRoadID = crossroadsUnity[index].eastNextRoadID;
				rightRoadID = crossroadsUnity[index].southNextRoadID;
				return trafficLights[index].W == "green" || canGo;
			default:
				return false;
		}
	}


	//Megmondja, hogy az autó mehet-e az alapján, hogy hány autó van a cél úton.
	//Az autó arra megy majd, amerre tud.
	public bool changeRoad(int current, int next)
	{
		if (next == -1)
		{
			roads[current].carCount--;
			return true;
		}
		if (roads[next].isThereSpace)
		{
			roads[current].carCount--;
			roads[next].carCount++;

			roads[next].isThereSpace = false;

			return true;
		}
		else return false;
	}

	//Szerveroldalról autót spawnol, ha tud.
	[Server]
	public void spawnCar(int index)
	{
		if(roads[index].spawnPoint)
		{
			if (roads[index].isThereSpace)
			{
				roads[index].isThereSpace = false;
				roads[index].carCount++;
				
				GameObject car = (GameObject)Instantiate(carPrefab, roads[index].spawnPoint.transform.position, roads[index].spawnPoint.transform.rotation);

				car.GetComponent<CarHL>().RoadID = index;
				car.GetComponent<CarHL>().CarColor = carColors[Random.Range(0, carColors.Count)];

				NetworkServer.Spawn(car);
			}
		}
	}
}


[System.Serializable]
public struct CrossroadUnity
{
	public trafficLightColor colors;

	//int?-et nem támogat unity, invalid érték: -1
	//Itt a kereszteződésből kivezető út ID-jét tároljuk.
	public int northNextRoadID;
	public int southNextRoadID;
	public int westNextRoadID;
	public int eastNextRoadID;
}

/* Utak kiosztása:
 * Egy út lehet, hogy fizikailag egy, viszont az alapján van szétosztva, hogy melyik kereszteződésbe torkollik.
 * Lehet intuitívabb elnevezése lenne road helyett a lane.
 *			 	  
 *		1	 	  5
 *		V		  V
 *   0 > < 2   4 > < 6
 *   	^	 	  ^
 *		3	 	  7
 *
 *	   13		  9
 *		V		  V
 *  12 > < 14  8 > < 10
 *		^		  ^
 *	   15		  11
 *  
 *  (Észak felfele van [arra mutat a fehér nyíl pályán], a 4 csomópont a 4 kereszteződésnek felel meg.)
 */

//Unityben egy utat egy ilyen szimbolizál
[System.Serializable]
public struct Road
{
	//Nem kötelező megadni
	public Transform spawnPoint;
	//A safespace állítja
	public bool isThereSpace;
	public int carCount;
}

[System.Serializable]
public struct Crossroads
{
	public string N;
	public string E;
	public string S;
	public string W;
}

[System.Serializable]
public struct RoadSystem
{
	public Crossroads NW;
	public Crossroads NE;
	public Crossroads SE;
	public Crossroads SW;
}

public class TrafficLights
{
	public RoadSystem roadSystem;

	public bool[] isWithoutLights = { true, true, true, true };
	public bool[] isThereSpace = { true, true, true, true };

	public bool canGo(int i)
	{
		return isWithoutLights[i] && isThereSpace[i];
	}

	public Crossroads this[int i]
	{
		get {
			switch(i)
			{
				case 0:
					return roadSystem.NW;
				case 1:
					return roadSystem.NE;
				case 2:
					return roadSystem.SE;
				default:
					return roadSystem.SW;
			}
		}
	}
}