TankShooting

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

public class TankShooting : MonoBehaviour
{
    public Text ammoText;

    public int ammo = 30; // Current ammo "in gun"
    public int totalAmmo = 100; // Total amount of ammo
    public int maxClipSize = 30; // Full reload amount

    public GameObject shootObj; // Where shots spawn from
    public GameObject bulletPrefab; // Prefab we shoot

    public AudioClip[] shootClip; // Shoot audio clips
    AudioSource audioSrc; // AudioSource for playing clips

    void Start ()
    {
        // Gets audiosource from this obj
        audioSrc = GetComponent<AudioSource>();
        AdjustAmmo(0); // Updates ammoText
    }

	void Update ()
    {
        // If you press space and have ammo > shoot
        if (Input.GetKeyDown(KeyCode.Space) && ammo > 0)
        {
            ammo--; // Ammo goes down by 1
            AdjustAmmo(0); // Updates ammoText

            // Randomly change pitch and play random shoot clip (variety)
            audioSrc.pitch = Random.Range(0.75f, 1.25f);
            audioSrc.PlayOneShot( shootClip [ Random.Range(0,shootClip.Length) ] );

            // Spawn bullet at shootObj position
            GameObject bullet = Instantiate(bulletPrefab, shootObj.transform.position, Quaternion.identity);
            // Add force to bullet
            bullet.GetComponent<Rigidbody>().AddForce(transform.forward * 1750);
            // Destroy bullet after 5 sec
            Destroy(bullet, 5);
        }

        if(Input.GetKeyDown(KeyCode.R))
        {
            Reload();
        }
	}

    // Fills up ammo as much as possible
    void Reload()
    {
        // Figure out how much ammo we need to reload
        int ammoToReload = maxClipSize - ammo;

        // If we dont have enough total ammo for full reload
        if(totalAmmo < ammoToReload)
        {
            // Put all our ammo into current ammo
            ammo += totalAmmo;
            totalAmmo = 0;
        }
        else
        {
            // Full ammo
            ammo = maxClipSize;
            // Total ammo is subtracted by the amount we're reloading
            totalAmmo -= ammoToReload;
        }
        // Update text
        AdjustAmmo(0);
    }

    public void AdjustAmmo(int adj)
    {
        // Adjust our total ammo
        totalAmmo += adj;

        // Update ammo text
        ammoText.text = "AMMO: " + ammo + " / " + totalAmmo;
    }
}