extends KinematicBody

const EPSILON = 0.0001
const SPEED = 3.0

export var inventory = { "ore" : 0 }

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

func _physics_process(delta):
	var input = Vector3(Input.get_axis("left", "right"), 0.0, Input.get_axis("up", "down"))
	var motion = Plane.PLANE_XZ.project(get_viewport().get_camera().global_transform.basis.xform(input)).normalized() * SPEED
	if motion.length_squared() > EPSILON:
		$DungMan.look_at(global_transform.origin - motion, Vector3.UP)
	move_and_slide(motion)

func can_afford(item_name, item_amount):
	assert(item_amount > 0)
	var current_amount : int = 0
	if(inventory.has(item_name)):
		current_amount = inventory[item_name]
	return current_amount >= item_amount
	
func modify_inventory(item_name, item_amount):
	if item_amount == 0:
		return true
		
	var is_op_valid : bool = true
	
	# Note(asr): check if you can afford the item if we are removing
	# for item grants op is always valid
	if item_amount < 0:
		is_op_valid = can_afford(item_name, abs(item_amount))
		
	if not is_op_valid:
		return false
	
	var current_amount : int = 0
	if inventory.has(item_name):
		current_amount = inventory[item_name]
	# Note(asr): clamp to 0. can't have negative items
	var new_amount : int = max(current_amount + item_amount, 0)
	inventory[item_name] = new_amount
	print("inventory updated: ", item_name, " : ", new_amount)
	return true

func _unhandled_input(event):
	if event.is_action_pressed("action"):
		for area in $"%TriggerVolume".get_overlapping_areas():
			if try_trigger_interact(area):
				break
		
func try_trigger_interact(area):
	var owner = area
	if area.has_meta("owner"):
		owner = area.get_meta("owner")
	
	if not owner.has_method("on_player_interact"):
		return false
		
	var result = owner.on_player_interact(self)
	if not result:
		print("player failed to interacted with ", owner)
		return

	print("player interacted with ", owner)
	return true