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

public enum Firemode
{
    SemiAuto,
    FullAuto
}

public class Shotgun : MonoBehaviour
{
    [Header("Put Animator Controller here")]
    public Animator animator;



    private AudioSource audioSource;
    private bool fireLock = false;

    [Header("Object References")]
    public ParticleSystem muzzleFlash;
    public Transform shootPoint;
    public GameObject bloodPrefab;
    public GameObject sparkPrefab;
    [Header("UI References")]
    public Text ammoText;
    [Header("Sound References")]
    public AudioClip fireSound;
    public AudioClip dryFireSound;
    public AudioClip reloadSound;

    [Header("Weapon Attributes")]
    public Firemode fireMode = Firemode.FullAuto;
    public float damage = 10f;
    public float fireRate = 1.0f;
    public int bulletsInClip;
    public int clipSize = 30;
    public int bulletsLeft;
    public int maxAmmo = 120;
    public int pellets = 1;
    public float reloadTime = 2.978f;
    public float spread = 0.1f;
    private bool isReloading = false;


    void Start()
    {
        animator = GetComponent<Animator>();
        audioSource = GetComponent<AudioSource>();

        bulletsInClip = clipSize;
        bulletsLeft = maxAmmo;

        UpdateTexts();
    }

    void UpdateTexts() {
        ammoText.text = "Ammo: " + bulletsInClip + " / " + bulletsLeft;
    }


    void Update()
    {
        if (isReloading)
            return;
        if (fireMode == Firemode.FullAuto && Input.GetButton("Fire1"))
        {
            CheckFire();
        }
        else if (fireMode == Firemode.SemiAuto && Input.GetButtonDown("Fire1"))
        {
            CheckFire();
        }

        if (Input.GetButtonDown("Reload"))
        {
            CheckReload();
        }
        if (bulletsInClip == 0)
        {
            StartCoroutine(Reload());
            audioSource.PlayOneShot(reloadSound);
        }
    }

    void CheckFire()
    {   if (fireLock) return;

        if (bulletsInClip > 0)
        {

            Fire();
            animator.CrossFadeInFixedTime("Fire", 0.01f);
        }
        else
        {
            DryFire();
        }
    }

    void Fire()
    {
        bulletsInClip--;

        audioSource.PlayOneShot(fireSound);
        fireLock = true;

        for(int i = 0; i < pellets; i++)   {
            DetectHit();
        }

        muzzleFlash.Stop();
        muzzleFlash.Play();

        UpdateTexts();

        StartCoroutine(CoResetFireLock());
    }

    public void CreateBlood(Vector3 pos, Quaternion rot)
    {
        GameObject blood = Instantiate(bloodPrefab, pos, rot);
        Destroy(blood, 1f);
    }

    void DetectHit() {
        RaycastHit hit;

        if(Physics.Raycast(shootPoint.position, CalculateSpread(spread, shootPoint), out hit)) {
            if (hit.transform.CompareTag("Enemy")) {
                 Health health = hit.transform.GetComponent<Health>();

                if(health == null) {
                    throw new System.Exception("Cannot found Health Component on Enemy.");
                }
                else {
                    health.TakeDamage(damage);
                    CreateBlood(hit.point, hit.transform.rotation);
                }
            }
            else
            {
                GameObject spark = Instantiate(sparkPrefab, hit.point, hit.transform.rotation);
                Destroy(spark, 1);
            }
        }
    }

    Vector3 CalculateSpread(float spread, Transform shootPoint)
    {
        return Vector3.Lerp(shootPoint.TransformDirection(Vector3.forward * 100), Random.onUnitSphere, spread);
    }

    void DryFire()
    {
        audioSource.PlayOneShot(dryFireSound);
        fireLock = true;

        StartCoroutine(CoResetFireLock());
    }

    IEnumerator CoResetFireLock()
    {
        yield return new WaitForSeconds(fireRate);
        fireLock = false;
    }

    void CheckReload()
    {
        if (bulletsLeft > 0 && bulletsInClip < clipSize)
        {
            StartCoroutine(Reload());
            audioSource.PlayOneShot(reloadSound);
        }
    }

    IEnumerator Reload()
    {animator.CrossFadeInFixedTime("ReloadStartEmpty", 0.01f);
        isReloading = true;

        yield return new WaitForSeconds(reloadTime);

        int bulletsToLoad = clipSize - bulletsInClip;
        int bulletsToSub = (bulletsLeft >= bulletsToLoad) ? bulletsToLoad : bulletsLeft;

        bulletsLeft -= bulletsToSub;
        bulletsInClip += bulletsToLoad;

        isReloading = false;

        UpdateTexts();
    }

    public void OnReload()
    {

    }
}