feat: Player

Assets/_Content/Scripts/Combat/ProjectileLauncher.cs

@@ -0,0 +1,107 @@
+using System;
+using UnityEngine;
+
+namespace Arena.Combat
+{
+	/// <summary>
+	/// Fires projectiles from a muzzle, limited by the fire interval and the ammo count.
+	/// Placed on the root of the shooter, which the projectiles ignore.
+	/// </summary>
+	public class ProjectileLauncher : MonoBehaviour
+	{
+		[System.Serializable]
+		public class Settings
+		{
+			[Tooltip("Weapon data: damage, fire interval, ammo, projectile.")]
+			public WeaponData Weapon;
+		}
+
+		[System.Serializable]
+		public struct References
+		{
+			[Tooltip("Spawn point of the projectiles. Its forward axis gives the direction.")]
+			public Transform Muzzle;
+		}
+
+		[System.Serializable]
+		public class StateContainer
+		{
+			public int Ammo;
+		}
+
+		#region Fields
+
+		[SerializeField] private Settings _settings;
+		[SerializeField] private References _references;
+		[SerializeField] private StateContainer _state;
+
+		/// <summary>
+		/// Raised with the current and max ammo each time the ammo changes.
+		/// </summary>
+		public event Action<int, int> OnAmmoChange;
+
+		public StateContainer State => _state;
+		public int MaxAmmo => _settings.Weapon.MaxAmmo;
+
+		private float _nextFireTime;
+
+		#endregion
+
+		#region Unity Lifecycle
+
+		private void Awake()
+		{
+			_state.Ammo = MaxAmmo;
+		}
+
+		#endregion
+
+		#region Public Methods
+
+		/// <summary>
+		/// Fires one projectile if the weapon is ready and has ammo. Returns true if a shot was fired.
+		/// </summary>
+		public bool TryFire()
+		{
+			if (Time.time < _nextFireTime || _state.Ammo <= 0)
+				return false;
+
+			_nextFireTime = Time.time + _settings.Weapon.FireInterval;
+			SetAmmo(_state.Ammo - 1);
+
+			Transform muzzle = _references.Muzzle;
+			Projectile projectile = Instantiate(_settings.Weapon.ProjectilePrefab, muzzle.position, muzzle.rotation);
+			projectile.Launch(_settings.Weapon.Damage, gameObject);
+			return true;
+		}
+
+		/// <summary>
+		/// Adds ammo without exceeding the weapon maximum.
+		/// </summary>
+		public void AddAmmo(int amount)
+		{
+			if (amount <= 0)
+				return;
+
+			SetAmmo(Mathf.Min(_state.Ammo + amount, MaxAmmo));
+		}
+
+		#endregion
+
+		#region Private Methods
+
+		private void SetAmmo(int value)
+		{
+			_state.Ammo = value;
+			OnAmmoChange?.Invoke(_state.Ammo, MaxAmmo);
+		}
+
+		[ContextMenu("Debug/Try Fire")]
+		private void DebugTryFire()
+		{
+			TryFire();
+		}
+
+		#endregion
+	}
+}