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

public class TokenBehaviour : MonoBehaviour
{
    private Vector3 mOffset;
    private Vector3 startingPosition;
    private Vector3 slotPosition;
    private float mZCoord;
    private bool triggered = false;
    private Rigidbody rBody;
    private Collider InitialTriggerVolume;
    private bool initTrigger = true;
    public Text countText;
    public Text winText;
    private float fDistance;
    private double dDistance;
    private Vector3 intersection;
    private Vector3[] TriggerVolumePositions = new Vector3[15];
    private Vector3[] TokenPositions = new Vector3[15];
    private float positionOffset = 0.4F;

    void Start()
    {
        rBody = GetComponent<Rigidbody>();
        SetCountText();
        winText.text = "";
        for (int i=0;i<15;i++)
        {
            TriggerVolumePositions[i] = GameObject.Find("TriggerVolume"+i.ToString()).transform.position;
            TokenPositions[i] = GameObject.Find("Token"+i.ToString()).transform.position;
        }
    }

    private void OnMouseDown()
    {
        startingPosition = transform.position;
        mZCoord = Camera.main.WorldToScreenPoint(gameObject.transform.position).z;
        mOffset = gameObject.transform.position - GetMouseWorldPos();
    }

    private void OnMouseUp()
    {
        string slotInBetweenID = slotInBetween();
        string destinationSlotID = destinationSlot();
        fDistance = Vector3.Distance(slotPosition, startingPosition);
        dDistance = Convert.ToDouble(fDistance);
        if (triggered && (dDistance > 10.8 && dDistance < 13.4))
        {
            transform.position = slotPosition;
            rBody.velocity = Vector3.zero;
            GameValue.numberOfPegsLeft--;
            GameObject.Find(InitialTriggerVolume.gameObject.name).GetComponent<PegSlot>().freeSlot = true;
            GameObject.Find("TriggerVolume" + slotInBetweenID).GetComponent<PegSlot>().freeSlot = true;
            GameObject.Find("TriggerVolume" + destinationSlotID).GetComponent<PegSlot>().freeSlot = false;
            GameObject.Find("Token" + slotInBetweenID).SetActive(false);
            gameObject.name = "Token" + destinationSlotID;
            SetCountText();
        }
        else
        {
            transform.position = startingPosition;
            rBody.velocity = Vector3.zero;
        }
    }

    private Vector3 GetMouseWorldPos()
    {
        Vector3 mousePoint = Input.mousePosition;
        mousePoint.z = mZCoord;
        return Camera.main.ScreenToWorldPoint(mousePoint);
    }

    private void OnMouseDrag()
    {
        transform.position = GetMouseWorldPos() + mOffset;
        transform.position = new Vector3(transform.position.x, 6, transform.position.z);
    }

    void OnTriggerEnter(Collider other)
    {
        if (other.gameObject.CompareTag("Trigger Volume") && GameObject.Find(other.gameObject.name).GetComponent<PegSlot>().freeSlot)
        {
            triggered = true;
            slotPosition = other.gameObject.transform.position;
        }
    }

    void OnTriggerExit(Collider other)
    {
        if(initTrigger && other.gameObject.CompareTag("Trigger Volume"))
        {
            InitialTriggerVolume = other;
            initTrigger = false;
        }
        else if (other.gameObject.CompareTag("Trigger Volume"))
        {
            triggered = false;
        }
        else if (other.gameObject.CompareTag("BoundingArea") && !GameValue.firstRoundDone)
        {
            GameValue.numberOfPegsLeft--;
            GameObject.Find(InitialTriggerVolume.gameObject.name).GetComponent<PegSlot>().freeSlot = true;
            GameValue.firstRoundDone = true;
            gameObject.SetActive(false);
            SetCountText();
        }
    }

    void SetCountText()
    {
        countText.text = "Peg left : " + GameValue.numberOfPegsLeft.ToString();
        if (GameValue.numberOfPegsLeft == 0)
        {
            winText.text = "You win!";
        }
    }

    private string slotInBetween()
    {
        string slotInBetween = "";
        intersection.x = (startingPosition.x + slotPosition.x) / 2;
        intersection.y = 4.54F;
        intersection.z = (startingPosition.z + slotPosition.z) / 2;
        for (int i = 0; i < 15; i++)
        {
            if(((intersection.x > TriggerVolumePositions[i].x - positionOffset) && (intersection.x < TriggerVolumePositions[i].x + positionOffset)) && ((intersection.z > TriggerVolumePositions[i].z - positionOffset) && (intersection.z < TriggerVolumePositions[i].z + positionOffset)))
            {
                slotInBetween = i.ToString();
            }
        }
        return slotInBetween;
    }

    private string destinationSlot()
    {
        string destinationSlot = "";
        for (int i = 0; i < 15; i++)
        {
            if (((slotPosition.x > TokenPositions[i].x - positionOffset) && (slotPosition.x < TokenPositions[i].x + positionOffset)) && ((slotPosition.z > TokenPositions[i].z - positionOffset) && (slotPosition.z < TokenPositions[i].z + positionOffset)))
            {
                destinationSlot = i.ToString();
            }
        }
        return destinationSlot;
    }
}