extends Window

var itemShopDisplayScene = preload("res://UI/Shopping/ItemShopDisplay.tscn")
@onready var inventoryItemDisplayer = $"VBoxContainer/Invs/Inventory/ItemZone/Items"
@onready var shopItemDisplayer = $"VBoxContainer/Invs/Shop/ItemZone/Items"
@onready var playerTradeItemDisplayer = $"VBoxContainer/TradeZone/TradeSides/PlayerSide/ItemZone/Items"
@onready var shopTradeItemDisplayer = $"VBoxContainer/TradeZone/TradeSides/ShopSide/ItemZone/Items"

@onready var costDisplay = $VBoxContainer/CostDisplay

@export var DeliveryItems:Array[Resource]

var shopItems = []

var playerTradeItems:Inventory
var shopTradeItems:Inventory

func _ready():
	inventoryItemDisplayer.buttonPressed.connect(add_to_player_trade)
	playerTradeItemDisplayer.buttonPressed.connect(remove_from_player_trade)
	
	shopItemDisplayer.buttonPressed.connect(add_to_shop_trade)
	shopTradeItemDisplayer.buttonPressed.connect(remove_from_shop_trade)
	
	shopItemDisplayer.quantitiesShown = false
	
	playerTradeItemDisplayer.negativeOptions = true
	shopTradeItemDisplayer.negativeOptions = true
	
	playerTradeItemDisplayer.positiveOptions = false
	shopTradeItemDisplayer.positiveOptions = false

func opened():
	get_tree().paused = true
	set_up_inventory()
	set_up_shop_inventory()
	
	playerTradeItems = Inventory.new()
	shopTradeItems = Inventory.new()
	
	update_cost_display()

func set_up_inventory():
	var inv = InventoryManager.get_inventory()
	for item in inv.items:
		if DeliveryItems.has(item):
			inventoryItemDisplayer.inventory.items.append(item)
			pass
	inventoryItemDisplayer.update_display()

func set_up_shop_inventory():
	shopItemDisplayer.inventory.items = shopItems
	for i in shopItems.size():
		shopItemDisplayer.inventory.quantities.append(1)
	
	shopItemDisplayer.update_display()

func add_to_shop_trade(item):
	shopTradeItems.add_item(item)
	
	shopTradeItemDisplayer.inventory = shopTradeItems
	shopTradeItemDisplayer.update_display()
	
	update_cost_display()

func remove_from_shop_trade(item):
	shopTradeItems.remove_item(item)
	
	shopTradeItemDisplayer.inventory = shopTradeItems
	shopTradeItemDisplayer.update_display()
	
	update_cost_display()

func add_to_player_trade(item):
	InventoryManager.remove_item_from_inventory(item)
	playerTradeItems.add_item(item)
	
	playerTradeItemDisplayer.inventory = playerTradeItems
	playerTradeItemDisplayer.update_display()
	inventoryItemDisplayer.update_display()
	
	update_cost_display()

func remove_from_player_trade(item):
	InventoryManager.add_item_to_inventory(item)
	playerTradeItems.remove_item(item)
	
	playerTradeItemDisplayer.inventory = playerTradeItems
	playerTradeItemDisplayer.update_display()
	inventoryItemDisplayer.update_display()
	
	update_cost_display()

func update_cost_display():
	var cost = get_cost()
	costDisplay.set_display(cost)

func get_cost():
	var playerOffering = 0
	var shopOffering = 0
	
	for i in range(playerTradeItems.items.size()):
		playerOffering += playerTradeItems.items[i].value * playerTradeItems.quantities[i]
	
	for i in range(shopTradeItems.items.size()):
		shopOffering += shopTradeItems.items[i].value * shopTradeItems.quantities[i]
	
	return playerOffering - shopOffering

func reset_items():
	for i in range(playerTradeItems.items.size()):
		var currentItem = playerTradeItems.items[i]
		InventoryManager.add_item_to_inventory(currentItem, playerTradeItems.quantities[i])
	
	playerTradeItems = Inventory.new()
	playerTradeItemDisplayer.inventory = playerTradeItems
	playerTradeItemDisplayer.update_display()
	
	shopTradeItems = Inventory.new()
	shopTradeItemDisplayer.inventory = shopTradeItems
	shopTradeItemDisplayer.update_display()

func _on_leave_button_pressed():
	reset_items()
	get_tree().paused = false
	hide()

func _on_confirm_button_pressed():
	var currentCost = get_cost()*-1
	var currentGrapesOwned = InventoryManager.get_grape_count()
	
	if currentGrapesOwned >= currentCost:
		confirm_trade()

func confirm_trade():
	var currentCost = get_cost()
	InventoryManager.alter_grape_count(currentCost)
	
	for i in range(shopTradeItems.items.size()):
		InventoryManager.add_item_to_inventory(shopTradeItems.items[i], shopTradeItems.quantities[i])
	
	playerTradeItems = Inventory.new()
	playerTradeItemDisplayer.inventory = playerTradeItems
	playerTradeItemDisplayer.update_display()
	
	shopTradeItems = Inventory.new()
	shopTradeItemDisplayer.inventory = shopTradeItems
	shopTradeItemDisplayer.update_display()
	
	inventoryItemDisplayer.update_display()
	
	update_cost_display()