extends Spatial

class_name Board

onready var CardTemplate := preload("res://Scenes/Components/Card.tscn")

onready var camera := $Camera
onready var hand := $Camera/Hand
onready var ui := $BoardUI
onready var cards := $Cards

export var mouseHandThreshold = 0.85

var holdingCard: Card = null
var focusedCard: Card = null

var mouseOrigin: Vector2
var lastCameraTransform: Transform

func _ready():
	add_card("ff36", 0, true)
	add_card("ff36", 0, true)
	add_card("ff36", 0, true)
	add_card("ff36", 0, true)
	add_card("ff36", 0, true)
	add_card("ff36", 0, true)
	add_card("ff36", 0, true)
	add_card("ff36", 0, true)
	add_card("ff36", 0, true)
	add_card("ff36", 0, true)
	add_card("ff36", 0, false)
	reorder_hand()

func _input(event: InputEvent):
	# Camera zoom
	if event.is_action("zoom_in"):
		camera.zoom(true)
	elif event.is_action("zoom_out"):
		camera.zoom(false)
	# Save original camera and mouse position before panning
	if event.is_action_pressed("pan"):
		mouseOrigin = get_viewport().get_mouse_position()
		lastCameraTransform = camera.transform

func _process(delta: float):
	# If mouse is under a certain area then we're managing our hand
	var absMousePos := get_viewport().get_mouse_position()
	# If panning, translate mouse delta to camera delta
	if Input.is_action_pressed("pan"):
		var mouseDelta := absMousePos - mouseOrigin
		var mousePos: Vector2 = mouseDelta * 0.0096 * (1-camera.get_zoom()/5) # Magic numbers everywhere
		camera.transform.origin = lastCameraTransform.origin - Vector3(mousePos.x, 0, mousePos.y)
	# If holding a card, move it between board/hand
	if holdingCard != null:
		var relPos: float = absMousePos.y / get_viewport().size.y
		var selectingHand: bool = relPos > mouseHandThreshold
		if selectingHand and not holdingCard.inHand:
			holdingCard.inHand = true
			call_deferred("reparent", holdingCard, cards, hand)
		elif not selectingHand and holdingCard.inHand:
			holdingCard.inHand = false
			call_deferred("reparent", holdingCard, hand, cards)

func _card_picked(card: Card):
	holdingCard = card
	holdingCard.animation.play("lift")

func _card_dropped(card: Card):
	if card.inHand:
		card.animation.play("drop")
	else:
		card.animation.play_backwards("lift")
	holdingCard = null

func _card_selected(card: Card):
	if card.inHand and focusedCard == null:
		focusedCard = card
		card.animation.play("focus")

func _card_unselected(card: Card):
	if focusedCard == card:
		focusedCard = null
		card.animation.play("blur")

func reparent(object: Node, from: Node, to: Node):
	from.remove_child(object)
	to.add_child(object)
	object.set_owner(to)
	reorder_hand()

func add_card(cardID: String, playerID: int, inHand: bool):
	var card := CardTemplate.instance()
	card.cardID = cardID
	card.playerID = playerID
	card.inHand = inHand
	card.connect("card_dropped", self, "_card_dropped", [card])
	card.connect("card_picked", self, "_card_picked", [card])
	card.connect("card_selected", ui, "_card_selected", [card])
	card.connect("card_unselected", ui, "_card_unselected", [card])
	card.connect("card_selected", self, "_card_selected", [card])
	card.connect("card_unselected", self, "_card_unselected", [card])
	card.connect("card_dropped_anim", self, "check_hand_drop", [card])
	card.connect("card_menu", ui, "show_card_menu", [card])
	if inHand:
		# TODO if player != me, put in opponent's hand
		hand.add_child(card)
	else:
		cards.add_child(card)

func check_hand_drop(card: Card):
	# Re-order hand as soon as the animation is over
	if card.inHand:
		card.reset_transform()
		reorder_hand()

const MAX_CARD_DISTANCE := 0.5
const HAND_SCREEN_PERC := 0.6
const CARD_ROTATION := 0.03
const UNITSPERPX := 0.003

func reorder_hand():
	var cardsInHand: Array = hand.get_children()
	cardsInHand.sort_custom(TransformSorter, "sort")
	var size := cardsInHand.size()

	# Calculate total width of the player's hand and other things
	# This is done in two ways, for small hands, MAX_CARD_DISTANCE is usually used
	# as constant distance between cards, however, as the hand gets larger we don't
	# want them to go offscreen, therefore a "maximum screen %" is used to determine
	# how to fit all the cards within a % of the viewport's width
	var distancePerc := get_viewport().size.x * HAND_SCREEN_PERC * UNITSPERPX / size
	var distance := min(distancePerc, MAX_CARD_DISTANCE)
	var totalWidth := distance * (size-1)
	var minX := -totalWidth/2
	
	# Iterate over all items, keep track of the index
	var i := 0
	for child in cardsInHand:
		child.tween_move_to(Vector3(minX + distance * i, 0.02*i, -0.005*i))
		child.tween_rotate(Vector3(0, CARD_ROTATION * (size/2.0 - i), 0))
		i += 1
		child.reset_transform()
		child.tween()

class TransformSorter:
    static func sort(a, b):
        if a.transform.origin.x < b.transform.origin.x:
            return true
        return false