using System.Collections;
using System.Collections.Generic;
using Enums;
using UnityEngine;

//This is a SINGULAR gem
public class SC_Gem : MonoBehaviour
{
    [HideInInspector]
    public Vector2Int posIndex;

    private Vector2 firstTouchPosition;
    private Vector2 finalTouchPosition;
    private bool mousePressed;
    private float swipeAngle = 0;
    private SC_Gem otherGem;

    public GemType type;
    public bool isMatch = false;
    private Vector2Int previousPos;
    public GameObject destroyEffect;
    public int scoreValue = 10;

    public int blastSize = 1;
    private SC_GameLogic scGameLogic;

    void Update()
    {
        //if the current position doesnt match the index in GameBoard, animate it to move to the correct position
        //else, we update the GameBoard with the current possition, do we need this every frame????
        if (Vector2.Distance(this.transform.position, this.posIndex) > 0.01f)
            this.transform.position = Vector2.Lerp(this.transform.position, this.posIndex, SC_GameVariables.Instance.gemSpeed * Time.deltaTime);
        else
        {
            this.transform.position = new Vector3(this.posIndex.x, this.posIndex.y, 0);
            this.scGameLogic.SetGem(this.posIndex.x, this.posIndex.y, this);
        }
        
        if (this.mousePressed && Input.GetMouseButtonUp(0))
        {
            this.mousePressed = false;
            if (this.scGameLogic.CurrentState == GameState.Move)
            {
                this.finalTouchPosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
                CalculateAngle();
            }
        }
    }

    public void SetupGem(SC_GameLogic _ScGameLogic,Vector2Int _Position)
    {
        this.posIndex = _Position;
        this.scGameLogic = _ScGameLogic;
    }

    //Not every gem needs this
    private void OnMouseDown()
    {
        if (this.scGameLogic.CurrentState == GameState.Move)
        {
            this.firstTouchPosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
            this.mousePressed = true;
        }
    }

    //Not every gem needs this
    private void CalculateAngle()
    {
        this.swipeAngle = Mathf.Atan2(this.finalTouchPosition.y - this.firstTouchPosition.y, this.finalTouchPosition.x - this.firstTouchPosition.x);
        this.swipeAngle = this.swipeAngle * 180 / Mathf.PI;

        if (Vector3.Distance(this.firstTouchPosition, this.finalTouchPosition) > .5f)
            MovePieces();
    }

    //Not every gem needs this, maybe
    private void MovePieces()
    {
        this.previousPos = this.posIndex;

        if (this.swipeAngle < 45 && this.swipeAngle > -45 && this.posIndex.x < SC_GameVariables.Instance.rowsSize - 1)
        {
            this.otherGem = this.scGameLogic.GetGem(this.posIndex.x + 1, this.posIndex.y);
            this.otherGem.posIndex.x--;
            this.posIndex.x++;

        }
        else if (this.swipeAngle > 45 && this.swipeAngle <= 135 && this.posIndex.y < SC_GameVariables.Instance.colsSize - 1)
        {
            this.otherGem = this.scGameLogic.GetGem(this.posIndex.x, this.posIndex.y + 1);
            this.otherGem.posIndex.y--;
            this.posIndex.y++;
        }
        else if (this.swipeAngle < -45 && this.swipeAngle >= -135 && this.posIndex.y > 0)
        {
            this.otherGem = this.scGameLogic.GetGem(this.posIndex.x, this.posIndex.y - 1);
            this.otherGem.posIndex.y++;
            this.posIndex.y--;
        }
        else if (this.swipeAngle > 135 || this.swipeAngle < -135 && this.posIndex.x > 0)
        {
            this.otherGem = this.scGameLogic.GetGem(this.posIndex.x - 1, this.posIndex.y);
            this.otherGem.posIndex.x++;
            this.posIndex.x--;
        }

        this.scGameLogic.SetGem(this.posIndex.x, this.posIndex.y, this);
        this.scGameLogic.SetGem(this.otherGem.posIndex.x, this.otherGem.posIndex.y, this.otherGem);

        StartCoroutine(CheckMoveCo());
    }

    //Why are we checking matches on the Gem itself
    public IEnumerator CheckMoveCo()
    {
        this.scGameLogic.SetState(GameState.Wait);

        yield return new WaitForSeconds(.5f);
        this.scGameLogic.FindAllMatches();

        if (this.otherGem != null)
        {
            if (this.isMatch == false && this.otherGem.isMatch == false)
            {
                this.otherGem.posIndex = this.posIndex;
                this.posIndex = this.previousPos;

                this.scGameLogic.SetGem(this.posIndex.x, this.posIndex.y, this);
                this.scGameLogic.SetGem(this.otherGem.posIndex.x, this.otherGem.posIndex.y, this.otherGem);

                yield return new WaitForSeconds(.5f);
                this.scGameLogic.SetState(GameState.Move);
            }
            else
            {
                this.scGameLogic.DestroyMatches();
            }
        }
    }
}