State-Machine-Script

class_name PlayerStateMachine extends Node

var states: Array[ State ]
var prev_state: State
var current_state: State

# Called when the node enters the scene tree for the first time.
func _ready():
    process_mode = Node.PROCESS_MODE_DISABLED
    pass # Replace with function body.


# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta):
    ChangeState(current_state.Process(delta))
    pass


func _physics_process(delta):
    ChangeState(current_state.Physics(delta))
    pass


func _unhandled_input(event):
    ChangeState(current_state.HandleInput(event))
    pass


func Initialize(_player: Player) -> void:
    states = []

    for c in get_children():
        if c is State:
            states.append(c)

    if states.size() > 0:
        states[0].player = _player
        ChangeState(states[0])
        process_mode = Node.PROCESS_MODE_INHERIT


func ChangeState(new_state : State) -> void:
    if new_state == null || new_state == current_state:
        return

    if current_state:
        current_state.Exit()

    prev_state = current_state
    current_state = new_state
    current_state.Enter()