Player throw back the ball from walk or idle state

scripts/player/player.gd

@@ -1,6 +1,8 @@
 class_name Player
 extends CharacterBody2D
 
+signal hit
+signal collide_with_ball
 @export var speed = 120
 var y_spawn_offset = -8
 @onready var animation_player = $AnimationPlayer
@@ -11,3 +13,9 @@ func _ready():
 	var spawn_cell: Vector2i = tile_map.get_bottom_spawn_cell()
 	position = tile_map.map_to_local(spawn_cell)
 	position.y += y_spawn_offset
+
+
+func _on_area_2d_body_entered(body: Node2D):
+	# As player’s Area2D only collide with balls
+	# We only enter this function after colliding with a ball
+	collide_with_ball.emit()

scripts/player/states/player_idle_state.gd

@@ -1,13 +1,23 @@
 class_name PlayerIdleState
 extends PlayerState
 
+var collide_with_ball = false
+
 func enter(_msg := {}):
 	player.velocity = Vector2.ZERO
 	player.animation_player.play("idle")
 
 func update(_delta):
+	if collide_with_ball && Input.is_action_pressed("hit"):
+		collide_with_ball = false
+		state_machine.transition_to("Throw")
+	
 	if get_input_direction() != Vector2.ZERO:
 		state_machine.transition_to("Walk")
 
 func get_input_direction():
 	return Input.get_vector("move_left", "move_right", "move_up", "move_down")
+
+
+func _on_player_collide_with_ball():
+	collide_with_ball = true

scripts/player/states/player_throw_state.gd

@@ -0,0 +1,20 @@
+class_name PlayerThrowState
+extends PlayerState
+
+var is_animation_finished = false
+
+func enter(_msg := {}):
+	player.animation_player.speed_scale = 0.8
+	player.animation_player.play("throw")
+	player.hit.emit()
+
+func update(_delta: float):
+	if is_animation_finished:
+		state_machine.transition_to("Idle")
+
+func exit():
+	is_animation_finished = false
+	player.animation_player.speed_scale = 1
+
+func _on_animation_player_animation_finished(_anim_name):
+	is_animation_finished = true

scripts/player/states/player_walk_state.gd

@@ -4,13 +4,15 @@ extends PlayerState
 func enter(_msg := {}):
 	player.animation_player.play("walk")
 
-func physics_update(_delta):
+func physics_update(delta):
 	var direction = get_input_direction()
-	player.velocity = direction * player.speed
+	var velocity = direction * player.speed
+		
+	var collision = player.move_and_collide(velocity * delta)
+	if collision and Input.is_action_pressed("hit"):
+		state_machine.transition_to("Throw")
 	
-	player.move_and_slide() # This method calculate with delta, we don't need to do it.
-	
-	if player.velocity == Vector2.ZERO:
+	if velocity == Vector2.ZERO:
 		state_machine.transition_to("Idle")
 
 func get_input_direction():