extends CharacterBody2D

@onready var tile_layer : TileMapLayer = $"../TileMapLayer"
@onready var level : Node2D = $".."

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

var move_input : float
var dead : bool

func _ready() -> void:
	respawn()

func _physics_process(delta: float) -> void:
	
	if dead == false:
		#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:
			death()
			await get_tree().create_timer(1).timeout
			respawn()
			
			
func death() -> void:
	dead = true
	velocity.x = 0
	velocity.y = 0
	scale.x = lerp(scale.x, 0.0, 0.1)
	scale.y = lerp(scale.y, 0.0, 0.1)
	if al_globals.gravity < 0:
		al_globals.gravity *= -1
		
func respawn() -> void:
	dead = false
	scale.x = lerp(scale.x, 1.0, 0.1)
	scale.y = lerp(scale.y, 1.0, 0.1)
	position.x = level.startPosX
	position.y = level.startPosY