extends Control

var items : Array[Array]

@onready var positive_modifiers = [$Speed,$BulletSpeed,$Ammunition,$Damage]
@onready var negative_modifiers = [$IncomingDamage,$FiringDelay,$Size,$TaxRate]

var item_offset : int = 26

@export var bonus_scene : PackedScene

@export var item_scene : PackedScene
@export var items_start : Node2D

@export var player : CharacterBody2D

func _ready():
	items.append([])
	items.append([])
	for y in range(4):
		items[0].append([])
		items[1].append([])
		for x in range(4):
			
			var new_item = item_scene.instantiate()
			new_item.set_value(abs(y-x)+1)
			new_item.position = items_start.position + Vector2(x*item_offset,y*item_offset)
			new_item.last_position = Vector2i(x,y)
			new_item.inventory = self
			
			items[0][y].append(new_item)
			add_child(items[0][y][x])
			
			if x == y:
				var new_bonus = bonus_scene.instantiate()
				new_bonus.position = items_start.position + Vector2(x*item_offset,y*item_offset)
				new_bonus.last_position = Vector2i(x,y)
				new_bonus.inventory = self
				items[1][y].append(new_bonus)
				add_child(items[1][y][x])
			else:
				items[1][y].append(null)
	
	update_calculations()
			
func update_calculations():
	for y in range(4):
		var total = 0
		for x in range(4):
			if items[0][y][x] != null and items[1][y][x] == null:
				total += items[0][y][x]._value
		if total == 0:
			total = 1
		for x in range(4):
			if items[1][y][x] != null:
				total = items[1][y][x].calculate_bonus(total, items[0][y][x]._value)
		match y:
			0:
				player.speed = total
			1:
				player.bullet_speed = total
			2:
				player.ammunition = total
			3:
				player.damage = total
		positive_modifiers[y].text = '=' + str(total)
	
	for x in range(4):
		var total = 0
		for y in range(4):
			if items[0][y][x] != null and items[1][y][x] == null:
				total += items[0][y][x]._value
		if total == 0:
			total = 1
		for y in range(4):
			if items[1][y][x] != null:
				total = items[1][y][x].calculate_bonus(total, items[0][y][x]._value)
		match x:
			0:
				player.incoming_damage = total
			1:
				player.bullet_delay = total
			2:
				player.size = total
			3:
				player.tax = total
		negative_modifiers[x].text = '=' + str(total)

func inventory_to_global_coords(position : Vector2i) -> Vector2:
	return items_start.global_position + Vector2(position.x*item_offset,position.y*item_offset)

func global_to_inventory_coords(position : Vector2):
	position -= (items_start.global_position-Vector2(item_offset/2,item_offset/2))
	position = Vector2i(position)
	
	
	if position.x < 0 or position.y < 0:
		return null
		
	position /= item_offset
	
	position = Vector2i(position)
	
	if position.x >= 4 or position.y >= 4:
		return null
	
	return position
	

func _process(delta: float) -> void:
	pass
	
func _input(event):
	if event is InputEventMouseButton:
		var layer = 0
		if (event.button_index == MOUSE_BUTTON_LEFT or event.button_index == MOUSE_BUTTON_RIGHT) and event.pressed:
			if(event.button_index == MOUSE_BUTTON_RIGHT):
				layer = 1
			var inventory_position = global_to_inventory_coords(event.position)
			if inventory_position != null and items[layer][inventory_position.y][inventory_position.x] != null:
				items[layer][inventory_position.y][inventory_position.x].dragging = true
				items[layer][inventory_position.y][inventory_position.x].last_position = Vector2i(inventory_position.x,inventory_position.y)
				items[layer][inventory_position.y][inventory_position.x] = null