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

public class Boat : MonoBehaviour
{
    private NavMeshAgent agent;
    private LineRenderer lineRenderer;
    
    private GameObject spot;

    private Coroutine draw;
    
    public delegate void LandedEventHandler();
    public event LandedEventHandler OnLanded;

    private void Awake()
    {
        agent = GetComponent<NavMeshAgent>();
        lineRenderer = GetComponent<LineRenderer>();
        lineRenderer.startWidth = 0.1f;
        lineRenderer.endWidth = 0.1f;
        lineRenderer.material.color = Color.yellow;
        lineRenderer.enabled = false;
        
        spot = Instantiate(DataManager.Inst.mouseSpot);
    }

    private void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            var ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            RaycastHit hit;

            if (Physics.Raycast(ray, out hit, 1000f))
            {
                agent.SetDestination(hit.point);

                spot.gameObject.SetActive(true);
                spot.transform.position = hit.point;
                
                if (draw != null) StopCoroutine(draw);
                draw = StartCoroutine(DrawPath());
            }
        }
        else if (agent.remainingDistance < 0.1f)
        {
            spot.gameObject.SetActive(false);
            
            lineRenderer.enabled = false;
            if (draw != null) StopCoroutine(draw);
            
            OnLanded?.Invoke();
        }
    }

    private IEnumerator DrawPath()
    {
        lineRenderer.enabled = true;
        yield return null;
        while (true)
        {
            var count = agent.path.corners.Length;
            lineRenderer.positionCount = count;
            for (var i = 0; i < count; i++)
            {
                lineRenderer.SetPosition(i, agent.path.corners[i] + new Vector3(0,1,0));
            }
            yield return null;
        }
    }
}