using UnityEngine;
using UnityEngine.EventSystems;
using System.Collections;
using System.Collections.Generic;
using System.Runtime.InteropServices;

public class InputController : MonoBehaviour {

	private const float ORIGIN_SIZE = 25f;
	private const float MIN_SIZE = 10f;
	private const float MAX_SIZE = 25f;

	private const float MIN_ANGLE = 30f;
	private const float MAX_ANGLE = 80f;

	private const float FAR_AWAY_SIZE = 100f;

	public enum State
	{
		Faraway,
		ZoomIn,
		Battle,
	}

	public enum CameraMode
	{
		LockCraft = 0,
		FreeLook = 1
	}

	public State state;
	public CameraMode cameraMode;

	private BattleController battleController;
	private GameObject ground;

	private Vector3 lastMousePosition;

	public GameObject moveMarkPrefab;

	public bool lockCamera = true;

	private float distance = FAR_AWAY_SIZE;
	private float targetDistance = FAR_AWAY_SIZE;
	private float targetAngle = MAX_ANGLE;

	public ITarget cameraLockedTarget;
	private Vector3 lookAtPos;

	public CameraShake cameraShake;
	
	void Start () 
	{
		ground = GameObject.FindObjectOfType<GroundPlane>().gameObject;
		cameraShake = Camera.main.GetComponent<CameraShake>();
	}

	private bool IsPointerOverUIObject()
	{
		PointerEventData eventDataCurrentPosition = new PointerEventData(EventSystem.current);
		eventDataCurrentPosition.position = new Vector2(Input.mousePosition.x, Input.mousePosition.y);
		
		List<RaycastResult> results = new List<RaycastResult>();
		EventSystem.current.RaycastAll(eventDataCurrentPosition, results);
		return results.Count > 0;
	}

	public void SetBattleController(BattleController battleController)
	{
		this.battleController = battleController;
	}

	public Vector3 cameraPosition
	{
		get{
			return lookAtPos;
		}
	}

//	private void findCameraLockTarget()
//	{
//		if(battleController.ctrlCraft == null)
//		{
//			if(battleController.GetMyPlayer() == null || battleController.isGameOver || battleController.GetMyPlayer().CanRelive())
//			{
//				return;
//			}
//
//			bool findTarget = false;
//			ITarget firstTarget = null;
//			List<BattleObject> list = battleController.GetMap().GetBattleObjectByRange(new Vector3(), float.MaxValue, battleController.GetMyPlayer().team);
//			list.Sort(CompareCraftId);
//
//			for(int i=0; i<list.Count; i++)
//			{
//				BattleObject bo = list[i];
//				if(firstTarget == null)
//				{
//					firstTarget = bo;
//				}
//
//				if(cameraLockedTarget != null && cameraLockedTarget is BattleObject)
//				{
//					BattleObject lockedObj = cameraLockedTarget as BattleObject;
//					if(bo.id > lockedObj.id)
//					{
//						findTarget = true;
//						cameraLockedTarget = bo;
//						break;
//					}
//				}
//			}
//
//			if(!findTarget)
//			{
//				cameraLockedTarget = firstTarget;
//			}
//		}
//		else
//		{
//			cameraLockedTarget = battleController.ctrlCraft;
//		}
//	}


	public static int CompareCraftId(BattleObject a, BattleObject b)
	{
		if (a == null)
		{
			if (b == null)
			{
				return 0;
			}
			else
			{
				return -1;
			}
		}
		else
		{
			if (b == null)
			{
				return 1;
			}
			else
			{
				if(a.id > b.id)
				{
					return 1;
				}
				else if(a.id < b.id)
				{
					return -1;
				}
				else
				{
					return 0;
				}
			}
		}
	}


	public void SetCameraTo(Vector3 pos)
	{
		lookAtPos = pos;
		Vector3 cameraPosition = Camera.main.transform.position;
		Vector3 cameraRotation = Camera.main.transform.eulerAngles;
		
		float theta = NumberUtil.angleToRadian (cameraRotation.x);
		
		pos.y += distance * Mathf.Sin(theta);
		pos.z -= distance * Mathf.Cos(theta);

		Camera.main.transform.position = pos;
	}


	private void updateCamera ()
	{
		if (cameraMode != CameraMode.LockCraft)
			return;
		
		if(lockCamera)
		{
			if(cameraLockedTarget != null)
			{
				if(state == State.ZoomIn)
				{
					targetDistance -= GameTime.deltaTime*(targetDistance - MAX_SIZE) * 3f;
					if(targetDistance < MAX_SIZE+0.1f)
					{
						targetDistance = MAX_SIZE;
						state = State.Battle;
						battleController.ReadyToAction();
					}
				}

				Camera camera = battleController.gameCamera;

				Vector3 cameraPosition = camera.transform.position;
				Vector3 ctrlCraftPosition = cameraLockedTarget.position;
				lookAtPos = ctrlCraftPosition;

				distance = targetDistance;

				targetAngle = MIN_ANGLE + (MAX_ANGLE - MIN_ANGLE) * (targetDistance - MIN_SIZE) / (MAX_SIZE - MIN_SIZE);
				targetAngle = NumberUtil.forceBetween(targetAngle, MIN_ANGLE, MAX_ANGLE);
				Quaternion cameraRotation = Quaternion.Euler(targetAngle, 0f, 0f); ;

				float theta = NumberUtil.angleToRadian (targetAngle);

//				distance += (targetDistance - distance)*5f*GameTime.deltaTime;
				ctrlCraftPosition.y += distance * Mathf.Sin(theta);
				ctrlCraftPosition.z -= distance * Mathf.Cos(theta);

				if (battleController.GetCtrlCraft () != null) {
					cameraPosition.x += (ctrlCraftPosition.x - cameraPosition.x) * 5f * GameTime.deltaTime + cameraShake.offsetX;
					cameraPosition.z += (ctrlCraftPosition.z - cameraPosition.z) * 5f * GameTime.deltaTime + cameraShake.offsetZ;
					//				cameraPosition.y += (ctrlCraftPosition.y-cameraPosition.y)*5f*GameTime.deltaTime;
				} else {
					cameraPosition.x = ctrlCraftPosition.x + cameraShake.offsetX;
					cameraPosition.z = ctrlCraftPosition.z + cameraShake.offsetZ;
				}

				cameraPosition.y = ctrlCraftPosition.y;

				camera.transform.position = Vector3.Lerp(cameraPosition, camera.transform.position, GameTime.deltaTime * 5f);
				//camera.transform.localRotation = Quaternion.Slerp(camera.transform.localRotation, cameraRotation, GameTime.deltaTime * 100f); 
				camera.transform.localRotation = cameraRotation; 
			}
		}
		else
		{
			if(Input.GetMouseButtonDown(0))
			{
				lastMousePosition = Input.mousePosition;
			}
			else if(Input.GetMouseButton(0))
			{
				Vector3 currentMousePosition = Input.mousePosition;
				
				Vector3 lastWorldPosition = Camera.main.ScreenToWorldPoint(lastMousePosition);
				Vector3 currentWorldPosition = Camera.main.ScreenToWorldPoint(currentMousePosition);
				
				float deltaX = currentWorldPosition.x - lastWorldPosition.x;
				float deltaY = (currentWorldPosition.z - lastWorldPosition.z)/Mathf.Cos(Mathf.PI*10/180);
				
				Vector3 cameraPosition = Camera.main.transform.position;
				cameraPosition.x -= deltaX;
				cameraPosition.z -= deltaY;
				Camera.main.transform.position = cameraPosition;
				
				lastMousePosition = currentMousePosition;
			}
		}
	}


	void LateUpdate()
	{
		updateCamera ();
	}

	// Update is called once per frame
	void Update () 
	{
		float mouseScrollWheel = Input.GetAxis("Mouse ScrollWheel");
		if(mouseScrollWheel != 0)
		{
			zoom(-mouseScrollWheel*2);
		}

		if(battleController.isGameOver || BattleController.battleType == BattleController.BattleType.Edit)
		{
			return;
		}

		if (cameraMode == CameraMode.LockCraft)
			CameraLockCraft ();
		else if (cameraMode == CameraMode.FreeLook)
			CameraFreeLook ();
	}

	private Vector3 mouseDownPos;
	private Vector3 mouseDownCameraPos;
	private void CameraFreeLook()
	{
		if (Input.GetMouseButtonDown (0)) {
			mouseDownPos = Input.mousePosition;
			mouseDownCameraPos = Camera.main.transform.position;
		}

		if(Input.GetMouseButton(0))
		{
			Vector3 currentMousePos = Input.mousePosition;
			Vector3 pos = Camera.main.transform.position;

			float deltaX = (currentMousePos.x - mouseDownPos.x) / Screen.width;
			float deltaY = (currentMousePos.y - mouseDownPos.y) / Screen.height;

			pos.x = mouseDownCameraPos.x - deltaX * 20f;
			pos.z = mouseDownCameraPos.z - deltaY * 20f;
			Camera.main.transform.position = Vector3.Lerp (pos, Camera.main.transform.position, GameTime.deltaTime * 10f);
		}
	}

	private void CameraLockCraft()
	{
		Craft ctrlCraft = battleController.GetCtrlCraft();
		if (ctrlCraft != null) {
			if (Input.GetMouseButtonDown (0) && !IsPointerOverUIObject ()) {
				doClick ();
			}

			if (Input.GetKeyDown (KeyCode.Q)) {
				battleController.AttempUsePower (ctrlCraft.GetPowerManager ().GetPowers () [1].GetId ());
			} else if (Input.GetKeyDown (KeyCode.W)) {
				battleController.AttempUsePower (ctrlCraft.GetPowerManager ().GetPowers () [2].GetId ());
			} else if (Input.GetKeyDown (KeyCode.E)) {
				battleController.AttempUsePower (ctrlCraft.GetPowerManager ().GetPowers () [3].GetId ());
			} else if (Input.GetKeyDown (KeyCode.A)) {
				battleController.AttempUsePower (ctrlCraft.GetPowerManager ().GetCrystalPowers () [0].GetId ());
			} else if (Input.GetKeyDown (KeyCode.S)) {
				battleController.AttempUsePower (ctrlCraft.GetPowerManager ().GetCrystalPowers () [1].GetId ());
			}
		} else {
			if (Input.GetMouseButtonDown (0) && !IsPointerOverUIObject ()) {
				LockNextCraft ();
			}
		}
	}


	private void doClick()
	{
		Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
		RaycastHit hitInfo;
		
		if(Physics.Raycast(ray, out hitInfo))
		{
			if(hitInfo.collider.gameObject.Equals(ground))
			{
				int hitCol = (int)(hitInfo.point.x/Map.TILE_WIDTH);
				int hitRow = (int)(hitInfo.point.z/Map.TILE_LENGTH);
				
				Map map = battleController.GetMap();
				hitCol = NumberUtil.forceBetween(hitCol, 0, map.columns-1);
				hitRow = NumberUtil.forceBetween(hitRow, 0, map.rows-1);
				
				GameObject moveMark = Instantiate(moveMarkPrefab) as GameObject;
				Vector3 moveMarkPosition = new Vector3(hitInfo.point.x, 0.01f, hitInfo.point.z);
				moveMark.transform.position = moveMarkPosition;

				battleController.GetCtrlCraft().GetComponent<CraftAI>().followTarget = false;
				battleController.GetCtrlCraft().forceMove = true;
				battleController.GetMessageManager().Move(battleController.GetCtrlCraft(), hitCol, hitRow);

//				if(battleController.ctrlCraft.target == null)
//				{
//					float theta = NumberUtil.getRadianByATan(moveMarkPosition.x, moveMarkPosition.z, battleController.ctrlCraft.position.x, battleController.ctrlCraft.position.z);
//					float rotateAngle = 90-NumberUtil.radianToAngle(theta);
//					battleController.ctrlCraft.setRotateTargetAngle(rotateAngle);
//				}
			}
			else
			{
				Craft craft = hitInfo.collider.GetComponent<Craft>();
				if(craft == null)
				{
					Debuger.LogError("craft is null");
					return;
				}

				if (craft.team != battleController.GetCtrlCraft().team) {
					battleController.GetCtrlCraft().target = craft;
					battleController.GetCtrlCraft().GetComponent<CraftAI> ().followTarget = true;
				}
			}
		}
	}

	public void LockNextCraft()
	{
		if (state != State.Battle)
			return;

		if (cameraLockedTarget == null || !(cameraLockedTarget is Craft) || (cameraLockedTarget as Craft).IsDead ())
			cameraLockedTarget = null;

		List<Player> playerList = battleController.GetBattleSession ().GetPlayerList ();
		Craft firstCraft = null;
		for(int i=0; i<playerList.Count; i++)
		{
			Player player = playerList [i];
			if (player.GetHero ().GetCraft () == null)
				continue;

			if (firstCraft == null)
				firstCraft = player.GetHero ().GetCraft ();

			if (cameraLockedTarget != null) {
				if(cameraLockedTarget == player.GetHero().GetCraft())
				{
					cameraLockedTarget = null;
				}
			} else {
				cameraLockedTarget = player.GetHero ().GetCraft ();
				break;
			}
		}

		if (cameraLockedTarget == null) {
			cameraLockedTarget = firstCraft;
		}
	}

	private void zoom(float value)
	{
		if(state == State.Battle)
		{
			targetDistance += value*10f;
			targetDistance = NumberUtil.forceBetween(targetDistance, MIN_SIZE, MAX_SIZE);
		}
	}
	
}