class_name Player
extends CharacterBody3D

const SPEED = 3.0
const JUMP_VELOCITY = 3.5

@onready var geometry:Node3D = %Geometry
@onready var actionable_detector = %ActionableDetector
@onready var animation_tree:AnimationTree = $Geometry/AnimationTree
@onready var build_location:Node3D = %BuildLocation
@onready var right_hand_attachement:HandTool = %RightHandAttachement

var tool_damage:bool = false :
	get:
		return tool_damage
	set(value):
		tool_damage = value
		
		if right_hand_attachement != null and right_hand_attachement.tool_hitbox:
			right_hand_attachement.tool_hitbox.monitorable = bool(tool_damage)

var gravity = ProjectSettings.get_setting("physics/3d/default_gravity")
var inventory:Inventory = Inventory.new()
var selected_tool_slot_index:int = 0
var current_tool:ItemResource = null

var _current_look_direction:Vector3 = Vector3.BACK
var _target_look_direction:Vector3 = Vector3.BACK
var _look_angle_damper:SpringDamper = SpringDamper.new(0, 4, 0.06, 0.003)

var is_input_blocked:bool = false

signal trigger_message(message:String)

func _process(_delta):
	if animation_tree.get("parameters/playback").get_current_node() == "Interact":
		animation_tree.set("parameters/conditions/interact", false)

func _handle_input() -> void:
	# Get the input direction and handle the movement/deceleration.
	# As good practice, you should replace UI actions with custom gameplay actions.
	var input_dir = Input.get_vector("walk_left", "walk_right", "walk_forward", "walk_back")
	var direction = Vector3(input_dir.x, 0, input_dir.y).normalized()
	if direction:
		velocity.x = direction.x * SPEED
		velocity.z = direction.z * SPEED
	else:
		velocity.x = move_toward(velocity.x, 0, SPEED)
		velocity.z = move_toward(velocity.z, 0, SPEED)

	if is_on_floor() and Input.is_action_just_pressed("jump"):
		velocity.y = JUMP_VELOCITY

func _physics_process(delta):
	# Add the gravity.
	if not is_on_floor():
		velocity.y -= gravity * delta

	if is_input_blocked:
		velocity = Vector3.ZERO
	else:
		_handle_input()

	move_and_slide()
	
	var ground_velocity:Vector2 = Vector2(velocity.x, velocity.z)
	var is_moving:bool = ground_velocity.length_squared() > 0.1 * 0.1
	
	if is_moving:
		_target_look_direction = Vector3(velocity.x, 0, velocity.z).normalized()

	_current_look_direction = basis.z

	update_look_direction(delta)

	animation_tree.set("parameters/conditions/running", is_moving)
	animation_tree.set("parameters/conditions/idle", not is_moving)

func init_look_target_direction() -> void:
	_target_look_direction = basis.z

func update_look_direction(delta:float) -> void:
	var current_look_angle:float = _current_look_direction.signed_angle_to(Vector3.BACK, Vector3.UP)
	var target_look_angle:float = _target_look_direction.signed_angle_to(Vector3.BACK, Vector3.UP)
	if target_look_angle - current_look_angle > PI:
		current_look_angle = current_look_angle + PI * 2
	elif current_look_angle - target_look_angle > PI:
		current_look_angle = current_look_angle - PI * 2
	
	var damped_look_angle:float = _look_angle_damper.calc(current_look_angle, target_look_angle, delta)
	
	_current_look_direction = Vector3(sin(-damped_look_angle), 0, cos(-damped_look_angle))
	self.basis = Basis.looking_at(-_current_look_direction)
	

func set_tool_slot_index(value:int) -> void:
	if inventory == null:
		return
	
	selected_tool_slot_index = value
	set_right_hand_item(inventory.get_tool_item_stacks()[selected_tool_slot_index].item)

func on_item_picked_up(item:ItemResource):
	trigger_message.emit("Picked up a " + item.name)
	inventory.add_item(item)


func get_actionable_global_transform() -> Vector3:
	return build_location.global_position


func set_right_hand_item(item:ItemResource) -> void:
	current_tool = null
	
	right_hand_attachement.set_tool(item.scene.instantiate())
	
	if item != null and item.is_tool:
		current_tool = item

		animation_tree.set("parameters/Interact/conditions/tool_action_slice", false)
		animation_tree.set("parameters/Interact/conditions/tool_action_chop", false)				
		
		match item.tool_action:
			1:
				animation_tree.set("parameters/Interact/conditions/tool_action_chop", true)
			2:
				animation_tree.set("parameters/Interact/conditions/tool_action_slice", true)

func has_build_tool_active() -> bool:
	if current_tool and current_tool.resource_path == "res://data/items/hammer.tres":
		return true
	
	return false

func handle_tool_slot_input_events(_event:InputEvent) -> bool:
	var key_event:InputEventKey = _event as InputEventKey
	
	if key_event and key_event.is_released():
		if key_event.keycode >= KEY_1 and key_event.keycode <= KEY_9:
			set_tool_slot_index(key_event.keycode - KEY_1)
			return true
	
	if _event.is_action_released("item_next"):
		set_tool_slot_index((selected_tool_slot_index + 1) % (inventory.get_tool_item_stacks().size()))
		return true

	if _event.is_action_released("item_prev"):
		var tool_slot_size = inventory.get_tool_item_stacks().size()
		set_tool_slot_index((selected_tool_slot_index + tool_slot_size - 1) % (tool_slot_size))
		return true
		
	return false

func _unhandled_input(_event: InputEvent) -> void:
	if Input.is_action_just_pressed("ui_accept"):
		var actionables = actionable_detector.get_overlapping_areas()
		if actionables.size() > 0:
			_target_look_direction = (actionables[0].global_position - position).normalized()
			actionables[0].action()
			
			get_viewport().set_input_as_handled()
			return
	
	if Input.is_action_just_pressed("interaction"):
		animation_tree.set("parameters/conditions/interact", true)
		
		get_viewport().set_input_as_handled()
		return