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

public class Laser : MonoBehaviour
{
    public bool flipDirection;
    public int power = 1;

    float maxDistance = 1000.0f;
    bool isHorizontal;
    LineRenderer laserLine;
    GameObject lastChargePoint;

    void Start()
    {
        laserLine = GetComponent<LineRenderer>();
        isHorizontal = GetComponent<Turret>().isHorizontal;
    }

    void Update()
    {
        RaycastHit2D hit = DrawLaser(transform.position);
        HandleHit(hit);
    }

    RaycastHit2D DrawLaser(Vector3 startPosition)
    {
        laserLine.SetPosition(0, startPosition);
        RaycastHit2D hit;

        if (isHorizontal)
        {
            float endpointY = flipDirection ? startPosition.y - maxDistance : startPosition.y + maxDistance;
            hit = Physics2D.Raycast(startPosition, flipDirection ? Vector2.down : Vector2.up);

            if (hit.collider) laserLine.SetPosition(1, hit.point);
            else laserLine.SetPosition(1, new Vector3(startPosition.x, endpointY, 0));
        } else
        {
            float endpointX = flipDirection ? startPosition.x - maxDistance : startPosition.x + maxDistance;
            hit = Physics2D.Raycast(startPosition, flipDirection ? Vector2.left : Vector2.right);

            if (hit.collider) laserLine.SetPosition(1, hit.point);
            else laserLine.SetPosition(1, new Vector3(endpointX, startPosition.y, 0));
        }

        return hit;
    }

    void HandleHit(RaycastHit2D hit)
    {
        if (hit.collider)
        {
            if (hit.collider.tag == "Mirror") HitMirror(hit);
            if (hit.collider.tag == "Charge Point") HitChargePoint(hit);
        }
        else HitNothing();
    }

    void HitMirror(RaycastHit2D hit)
    {

        if (isHorizontal)
        {
            // TODO
        }
        else
        {
            // TODO
        }
    }

    void HitChargePoint(RaycastHit2D hit)
    {
        if (hit.collider.gameObject != lastChargePoint) hit.collider.GetComponent<ChargePoint>().adjustCharges(power);
        lastChargePoint = hit.collider.gameObject;
    }

    void HitNothing()
    {
        if (lastChargePoint) lastChargePoint.GetComponent<ChargePoint>().adjustCharges(power * -1);
        lastChargePoint = null;
    }

    void OnDrawGizmosSelected()
    {
        float distance = 1.0f;
        isHorizontal = GetComponent<Turret>().isHorizontal;
        Vector3 offset = isHorizontal ? new Vector3(0, distance, 0) : new Vector3(distance, 0, 0);

        Gizmos.color = Color.blue;
        Gizmos.DrawLine(transform.position, flipDirection ? transform.position - offset : transform.position + offset);
    }
}