extends CharacterBody2D

@onready var tile_layer : TileMapLayer = $"../TileMapLayer"

@export_category("Movement")
@export var acceleration : float = 50
@export var braking : float = 20
@export var move_speed : float = 100

var move_input : float

func _physics_process(delta: float) -> void:
	
	#Horizontal movement.
	move_input = Input.get_axis("move_left", "move_right")
	if move_input != 0:
		velocity.x = lerp(velocity.x, move_input * move_speed, acceleration * delta)
	else:
		velocity.x = lerp(velocity.x, 0.0, braking * delta)
		
	#Vertical movement.
	velocity.y += al_globals.gravity * delta
	
	if Input.is_action_just_pressed("flip") and (is_on_floor() or is_on_ceiling()):
		al_globals.gravity *= -1
	
	move_and_slide() #Allow physics control.
	spike_detection() #Checks for tiles with the "Spike" custom data enabled.
	
func spike_detection() -> void:
	#Adapted from Godot forum post.
	
	#Get current tile, and then put the data from it into a variable.
	var tile_coord = tile_layer.local_to_map(tile_layer.to_local(global_position))
	var tile_data = tile_layer.get_cell_tile_data(tile_coord)
	
	#If it has data, check for it. If it has the "spike" custom data, ensure the gravity is set back to normal, and then reset the level.
	if tile_data:
		var custom_data = tile_data.get_custom_data("spike")
		if custom_data == true:
			if al_globals.gravity < 0:
				al_globals.gravity *= -1
			get_tree().change_scene_to_file("res://Scenes/main.tscn")