extends Panel
## One inventory slot: icon, stack count, optional hotbar number. Renders a
## stack and reports clicks; it never changes the inventory itself.

signal clicked(index: int, right: bool, shift: bool)

const UITheme = preload("res://scripts/ui/theme.gd")

var index := 0
var _icon: TextureRect
var _count: Label
var _key: Label
var _style: StyleBoxFlat
var _selected_style: StyleBoxFlat
var _stack = null
var _wear: ColorRect
var _wear_fill: ColorRect

func _init(i: int = 0, size_px: int = 64, key_label: String = "") -> void:
	index = i
	custom_minimum_size = Vector2(size_px, size_px)
	mouse_filter = Control.MOUSE_FILTER_STOP
	_style = UITheme.box(UITheme.SLOT_BG, UITheme.SLOT_BORDER, 2, 5, 0)
	_selected_style = UITheme.box(UITheme.SLOT_BG.lightened(0.15), UITheme.SELECTED, 3, 5, 0)
	add_theme_stylebox_override("panel", _style)

	_icon = TextureRect.new()
	_icon.expand_mode = TextureRect.EXPAND_IGNORE_SIZE
	_icon.stretch_mode = TextureRect.STRETCH_KEEP_ASPECT_CENTERED
	_icon.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	_icon.offset_left = 5; _icon.offset_top = 5; _icon.offset_right = -5; _icon.offset_bottom = -5
	_icon.mouse_filter = Control.MOUSE_FILTER_IGNORE
	add_child(_icon)

	_count = UITheme.label("", 15)
	_count.set_anchors_and_offsets_preset(Control.PRESET_BOTTOM_RIGHT)
	_count.grow_horizontal = Control.GROW_DIRECTION_BEGIN
	_count.grow_vertical = Control.GROW_DIRECTION_BEGIN
	_count.offset_right = -5
	_count.offset_bottom = -2
	_count.mouse_filter = Control.MOUSE_FILTER_IGNORE
	add_child(_count)

	_key = UITheme.label(key_label, 12, UITheme.TEXT_DIM)
	_key.position = Vector2(5, 2)
	_key.mouse_filter = Control.MOUSE_FILTER_IGNORE
	add_child(_key)

	_wear = ColorRect.new()
	_wear.color = Color(0, 0, 0, 0.6)
	_wear.set_anchors_and_offsets_preset(Control.PRESET_BOTTOM_WIDE)
	_wear.offset_left = 6
	_wear.offset_right = -6
	_wear.offset_top = -9
	_wear.offset_bottom = -5
	_wear.mouse_filter = Control.MOUSE_FILTER_IGNORE
	_wear.visible = false
	add_child(_wear)
	_wear_fill = ColorRect.new()
	_wear_fill.anchor_bottom = 1.0
	_wear_fill.mouse_filter = Control.MOUSE_FILTER_IGNORE
	_wear.add_child(_wear_fill)

func set_stack(stack) -> void:
	_stack = stack
	if stack == null:
		_icon.texture = null
		_count.text = ""
		tooltip_text = ""
		_wear.visible = false
		return
	_icon.texture = ItemDB.icon(stack.id)
	_count.text = str(stack.count) if stack.count > 1 else ""
	var def := ItemDB.get_item(stack.id)
	tooltip_text = "%s\n%s" % [def.get("name", stack.id), def.get("description", "")]
	# Wear: a bar along the bottom once a tool or weapon has been used.
	var full := ItemDB.max_durability(stack.id)
	var left := ItemDB.durability(stack)
	if full > 0 and left < full:
		var k := float(left) / full
		_wear.visible = true
		_wear_fill.anchor_right = k
		_wear_fill.color = Color(0.85, 0.25, 0.2) if k < 0.2 else (Color(0.9, 0.75, 0.25) if k < 0.5 else Color(0.45, 0.8, 0.35))
		tooltip_text += "\n%d of %d uses left" % [left, full]
	else:
		_wear.visible = false

func set_selected(on: bool) -> void:
	add_theme_stylebox_override("panel", _selected_style if on else _style)

func _gui_input(event: InputEvent) -> void:
	if event is InputEventMouseButton and event.pressed:
		if event.button_index == MOUSE_BUTTON_LEFT or event.button_index == MOUSE_BUTTON_RIGHT:
			clicked.emit(index, event.button_index == MOUSE_BUTTON_RIGHT, event.shift_pressed)
			accept_event()