using System;
using UnityEngine;
using UnityEngine.Serialization;

[ExecuteInEditMode]
public class Dimensions : MonoBehaviour {

	[Tooltip("Player panels height")]
	public float panelHeightPixels;
	
	[Tooltip("Size in Unity units")]
	public Vector2 playGroundSize;
	
	[Tooltip("Height of the empty space between board and death zone")]
	public float emptySpaceHeight;
	
	
	public Camera mainCamera;
	public EdgeCollider2D topC, bottomC, leftC, rightC;
	public SpriteRenderer playGround;
	public SpriteRenderer playerPanelTop;
	public SpriteRenderer playerPanelBottom;
	public SpriteRenderer background;

	public static Dimensions Singleton;
	private void Awake() {
		Singleton = this;
		GetComponents();
		SetDimensions();
	}

	private void GetComponents() {
		topL = topC.GetComponent<LineRenderer>();
		bottomL = bottomC.GetComponent<LineRenderer>();
	}

	public float top, bottom, left, right;
	public float boardTop, boardBottom;

	public float Width => right * 2;
	public float Height => top * 2;

	private LineRenderer topL, bottomL;

	private void SetDimensions() {
		top = playGroundSize.y / 2;
		bottom = -top;
		right = playGroundSize.x / 2;
		left = -right;

		boardTop = top - emptySpaceHeight;
		boardBottom = -boardTop;

		Vector2 v1 = new Vector3(left, 0);
		Vector2 v2 = new Vector3(right, 0);
		Vector2 v3 = new Vector3(0, top);
		Vector2 v4 = new Vector3(0, bottom);

		topC.transform.position = new Vector2(0, top);
		bottomC.transform.position = new Vector2(0, bottom);
		leftC.transform.position = new Vector2(left, 0);
		rightC.transform.position = new Vector2(right, 0);
		topC.points = new[] {v1, v2};
		bottomC.points = new[] {v1, v2};
		leftC.points = new[] {v3, v4};
		rightC.points = new[] {v3, v4};
		
		playGround.transform.rotation = Quaternion.Euler(0, 0, 90);
		playGround.size = new Vector2(playGroundSize.y, playGroundSize.x);
		
		const float lineWidth = 0.5f;
		Vector3 offset = Vector3.up * lineWidth / 2;
		
		topL.positionCount = bottomL.positionCount = 2;
		var v12 = new[] {(Vector3) v1 - offset, (Vector3) v2 - offset};
		topL.SetPositions(v12);
		v12 = new[] {(Vector3) v1 + offset, (Vector3) v2 + offset};
		bottomL.SetPositions(v12);
		
		mainCamera.orthographicSize = 0.5f / (1 - 2 * panelHeightPixels / mainCamera.pixelHeight) * playGroundSize.y;
		float height = mainCamera.orthographicSize * 2;
		float width = mainCamera.aspect * height;
		float panelHeight = (height - playGroundSize.y) / 2;

		playerPanelTop.transform.position = new Vector2(0, (height + Height) / 4);
		playerPanelBottom.transform.position = new Vector2(0, -(height + Height) / 4);
		
		playerPanelTop.size = playerPanelBottom.size = new Vector2(width, panelHeight);

		background.size = new Vector2(width, playGroundSize.y);
	}
	
	private void Update() {
		if (Application.isPlaying)
			return;
		
		SetDimensions();
	}
}