extends PanelContainer

@export var slot_kind: String = "cargo"
@export var slot_index: int = 0
@export var overlay_slot: bool = false

@onready var slot_label: Label = $SlotLabel

var _inventory: ShipInventory
var _icon: TextureRect
var _delete_button: Button
var _drop_highlight := false

func _ready() -> void:
	if slot_kind == "cargo":
		var overlay := Control.new()
		overlay.name = "ActionOverlay"
		overlay.mouse_filter = Control.MOUSE_FILTER_IGNORE
		add_child(overlay)
		_delete_button = Button.new()
		_delete_button.name = "SalvageButton"
		_delete_button.icon = preload("res://assets/icons/screwdriver.png")
		_delete_button.expand_icon = true
		_delete_button.add_theme_constant_override("icon_max_width", 18)
		_delete_button.z_index = 5
		_delete_button.tooltip_text = "Rozłóż przedmiot: +10 części"
		_delete_button.focus_mode = Control.FOCUS_NONE
		var tool_style := StyleBoxFlat.new()
		tool_style.bg_color = Color(0.04, 0.07, 0.1, 0.72)
		tool_style.border_color = Color("b68c53")
		tool_style.set_border_width_all(1)
		tool_style.set_corner_radius_all(3)
		tool_style.set_content_margin_all(2)
		_delete_button.add_theme_stylebox_override("normal", tool_style)
		_delete_button.add_theme_stylebox_override("hover", tool_style)
		_delete_button.add_theme_stylebox_override("pressed", tool_style)
		overlay.add_child(_delete_button)
		_delete_button.set_anchors_and_offsets_preset(Control.PRESET_TOP_RIGHT)
		_delete_button.offset_left = -24
		_delete_button.offset_right = -2
		_delete_button.offset_top = 2
		_delete_button.offset_bottom = 24
		_delete_button.custom_minimum_size = Vector2(22, 22)
		_delete_button.hide()
		_delete_button.pressed.connect(_delete_item)
	_inventory = get_tree().get_first_node_in_group("ship_inventory") as ShipInventory
	if _inventory:
		_inventory.inventory_changed.connect(_refresh)
		_inventory.ammunition_changed.connect(_refresh)
	custom_minimum_size = Vector2(72, 72) if slot_kind == "cargo" else Vector2(56, 56)
	slot_label.custom_minimum_size = Vector2.ZERO
	slot_label.add_theme_font_size_override("font_size", 9)
	_icon = TextureRect.new()
	_icon.name = "ItemIcon"
	_icon.expand_mode = TextureRect.EXPAND_IGNORE_SIZE
	_icon.stretch_mode = TextureRect.STRETCH_KEEP_ASPECT_CENTERED
	_icon.mouse_filter = Control.MOUSE_FILTER_IGNORE
	add_child(_icon)
	if overlay_slot and slot_kind == "weapon":
		var binding := Label.new()
		binding.mouse_filter = Control.MOUSE_FILTER_IGNORE
		binding.text = ["LPM", "PPM", "ŚPM"][slot_index]
		binding.position = Vector2(2, -24)
		binding.add_theme_font_size_override("font_size", 9)
		binding.add_theme_color_override("font_color", Color("a0b2c4"))
		# Use a plain overlay to keep the binding outside the slot's content layout.
		var marker := Control.new()
		marker.mouse_filter = Control.MOUSE_FILTER_IGNORE
		add_child(marker)
		marker.add_child(binding)
	_refresh()

func _process(_delta: float) -> void:
	var valid_drop := get_viewport().gui_is_dragging() and _can_drop_data(Vector2.ZERO, get_viewport().gui_get_drag_data())
	if valid_drop != _drop_highlight:
		_drop_highlight = valid_drop
		_apply_slot_style(_inventory.get_item(slot_kind, slot_index) if _inventory != null else null)
	_update_salvage_visibility()
	if slot_kind == "weapon" and _has_missile():
		queue_redraw()

func _update_salvage_visibility() -> void:
	if _delete_button == null or _inventory == null:
		return
	var hovered_control := get_viewport().gui_get_hovered_control()
	var hovered := hovered_control == self or (hovered_control != null and is_ancestor_of(hovered_control))
	_delete_button.visible = is_visible_in_tree() and hovered and _inventory.get_item(slot_kind, slot_index) != null and not get_viewport().gui_is_dragging()

func _draw() -> void:
	if slot_kind != "weapon" or not _has_missile() or _inventory == null:
		return
	var weapons := _inventory.ship.get_node("WeaponController")
	var remaining := float(weapons.get("missile_cooldown_remaining"))
	var duration := float(weapons.get("missile_cooldown_duration"))
	if remaining > 0.0:
		var height := (size.y - 4.0) * clampf(remaining / duration, 0.0, 1.0)
		draw_rect(Rect2(2.0, size.y - 2.0 - height, size.x - 4.0, height), Color(1.0, 0.5, 0.1, 0.45))

func _refresh() -> void:
	if not is_node_ready() or not _inventory:
		return
	var item: ItemInstance = _inventory.get_item(slot_kind, slot_index)
	_apply_slot_style(item)
	if not _inventory.is_slot_unlocked(slot_kind,slot_index):
		_icon.texture = null
		slot_label.visible = true
		slot_label.text = "BLOKADA"
		slot_label.add_theme_color_override("font_color",Color("9a795b"))
		tooltip_text = "Slot zablokowany. Odblokowuj kolejne miejsca w hangarze fregaty.\nNastępny slot: " + _inventory.get_slot_unlock_cost_text(slot_kind)
		_update_salvage_visibility()
		return
	_icon.texture = item.definition.icon if item != null and item.definition != null else _empty_icon()
	_icon.modulate = Color(1, 1, 1, 1.0 if item != null else 0.16)
	slot_label.visible = _icon.texture == null
	tooltip_text = item.get_tooltip_text() if item != null else _empty_slot_text()
	if item != null and slot_kind == "weapon" and _has_missile():
		tooltip_text += "\nCooldown po addonach: %.2f s\nZapas rakiet: %d" % [_inventory.get_missile_cooldown(item), _inventory.get_missile_count()]
	_update_salvage_visibility()
	if item == null or item.definition == null:
		slot_label.add_theme_color_override("font_color", Color("82909e"))
		slot_label.text = "—"
		return
	var definition := item.definition
	slot_label.add_theme_color_override("font_color", Color("f1f4f8"))
	slot_label.text = definition.display_name

func _apply_slot_style(item: ItemInstance) -> void:
	var style := StyleBoxFlat.new()
	style.bg_color = Color("101925")
	style.border_color = Color("354455")
	style.set_border_width_all(1)
	style.set_content_margin_all(5)
	style.set_corner_radius_all(4)
	if slot_kind == "cargo":
		style.content_margin_right = 5
	if item != null and item.definition != null:
		style.border_color = item.get_type_color()
		style.bg_color = item.get_background_color()
		style.set_border_width_all(2)
	if overlay_slot:
		style.bg_color.a = 0.86 if item != null else 0.48
	if _drop_highlight:
		style.border_color = Color("75ffd0")
		style.set_border_width_all(3)
		style.bg_color = Color(0.08, 0.3, 0.25, 0.85)
		style.shadow_color = Color(0.2, 1.0, 0.72, 0.3)
		style.shadow_size = 5
	add_theme_stylebox_override("panel", style)

func _delete_item() -> void:
	if _inventory:
		_inventory.delete_cargo_item(slot_index)

func _make_custom_tooltip(for_text: String) -> Object:
	var panel := PanelContainer.new()
	panel.set_script(preload("res://scripts/ui/item_tooltip_frame.gd"))
	var background := StyleBoxFlat.new()
	background.bg_color = Color("101925b8")
	background.border_color = Color("52677e")
	background.set_border_width_all(1)
	background.border_width_top = 2
	background.set_content_margin_all(12)
	background.set_corner_radius_all(3)
	background.shadow_size = 0
	panel.add_theme_stylebox_override("panel", background)
	var label := RichTextLabel.new()
	label.fit_content = true
	label.scroll_active = false
	label.mouse_filter = Control.MOUSE_FILTER_IGNORE
	label.custom_minimum_size.x = 290
	label.size.x = 290
	label.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	label.add_theme_font_size_override("normal_font_size", 11)
	label.add_theme_constant_override("line_separation", -2)
	label.add_theme_color_override("default_color", Color("c4d2df"))
	var item := _inventory.get_item(slot_kind, slot_index)
	if item:
		# Dark neutral body with an accent tied to the equipment category.
		background.bg_color = Color("0c1520").lerp(item.get_background_color().darkened(0.8), 0.25)
		background.bg_color.a = 0.72
		background.border_color = item.get_type_color()
		panel.set("accent", item.get_type_color())
	var columns := HBoxContainer.new()
	columns.add_theme_constant_override("separation", 12)
	panel.add_child(columns)
	var details := VBoxContainer.new()
	details.custom_minimum_size.x = 290
	details.size_flags_vertical = Control.SIZE_SHRINK_BEGIN
	details.add_theme_constant_override("separation", 8)
	columns.add_child(details)
	var lines := for_text.split("\n")
	if item != null:
		var header_frame := PanelContainer.new()
		var header_style := StyleBoxFlat.new()
		header_style.bg_color = Color(item.get_type_color().darkened(0.8), 0.45)
		header_style.border_color = item.get_type_color().darkened(0.35)
		header_style.border_width_left = 3
		header_style.set_content_margin_all(8)
		header_frame.add_theme_stylebox_override("panel", header_style)
		details.add_child(header_frame)
		var header := HBoxContainer.new()
		header.add_theme_constant_override("separation", 10)
		header_frame.add_child(header)
		if item.definition.icon != null:
			var icon := TextureRect.new()
			icon.texture = item.definition.icon
			icon.custom_minimum_size = Vector2(54, 54)
			icon.expand_mode = TextureRect.EXPAND_IGNORE_SIZE
			icon.stretch_mode = TextureRect.STRETCH_KEEP_ASPECT_CENTERED
			header.add_child(icon)
		var heading := VBoxContainer.new()
		heading.size_flags_horizontal = Control.SIZE_EXPAND_FILL
		heading.add_theme_constant_override("separation", 2)
		header.add_child(heading)
		var title := _comparison_label(item.definition.display_name, 0, Color("f1f4f8"))
		title.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
		title.add_theme_font_size_override("font_size", 13)
		heading.add_child(title)
		heading.add_child(_comparison_label("%s · POZ. %d" % [item.get_rarity_name(), item.item_level], 0, item.get_type_color().lightened(0.25)))
		heading.add_child(_comparison_label("%s · ADDONY: %d/5" % [_category_name(item.definition.category), item.get_addon_count()], 0, Color("8ba2b7")))
		lines = lines.slice(2)
		while not lines.is_empty() and lines[0].is_empty():
			lines.remove_at(0)
	details.add_child(label)
	for line in lines:
		if line == "CECHA GŁÓWNA" or line.contains("ADDONY (aktywne"):
			label.push_font_size(10)
			label.push_color(Color("91dbea"))
			label.add_text("PARAMETRY\n" if line == "CECHA GŁÓWNA" else "ADDONY · PO ZAMONTOWANIU\n")
			label.pop()
			label.pop()
			continue
		var quality := 0
		var is_addon := false
		if item:
			for modifier in item.additional_modifiers:
				if modifier != null and line == modifier.get_display_text():
					is_addon = true
					quality = modifier.get_roll_quality(item.item_level)
					break
		var color := Color("ffd166") if quality == 2 else (Color("79e6a0") if quality == 1 else Color("c4d2df"))
		if line.begins_with("Obrażenia:"):
			label.push_font_size(13)
			color = Color("ffd166")
		if line.begins_with("Typ obrażeń:"):
			color = [Color("efb568"), Color("91dbea"), Color("a9ef83")][item.get_damage_type()] if item != null else Color("e6f2fc")
		if line.begins_with("Każdy strzał"):
			color = Color("8298ad")
		label.push_color(color)
		label.add_text(("★ " if quality == 2 else ("• " if is_addon else "")) + line + "\n")
		label.pop()
		if line.begins_with("Obrażenia:"):
			label.pop()
	if slot_kind == "cargo" and item != null:
		_add_comparison_column(columns, item)
	# Wrapped text can become shorter after the first layout pass.
	panel.minimum_size_changed.connect(func() -> void: panel.reset_size.call_deferred())
	panel.reset_size.call_deferred()
	return panel

func _add_comparison_column(columns: HBoxContainer, item: ItemInstance) -> void:
	if item.definition.category == ItemDefinition.Category.WEAPON:
		_add_weapon_comparison(columns, item)
		return
	var module_index := ShipInventory.MODULE_CATEGORIES.find(item.definition.category)
	if module_index < 0:
		return
	columns.add_child(VSeparator.new())
	var comparison := RichTextLabel.new()
	comparison.name = "EquipmentComparison"
	comparison.fit_content = true
	comparison.scroll_active = false
	comparison.mouse_filter = Control.MOUSE_FILTER_IGNORE
	comparison.custom_minimum_size.x = 270
	comparison.size.x = 270
	comparison.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	comparison.add_theme_font_size_override("normal_font_size", 11)
	comparison.add_theme_constant_override("line_separation", -2)
	comparison.add_theme_color_override("default_color", Color("c4d2df"))
	comparison.size_flags_vertical = Control.SIZE_SHRINK_BEGIN
	columns.add_child(comparison)
	var equipped := _inventory.get_item("module", module_index)
	comparison.push_color(Color("91dbea"))
	comparison.add_text("ZMIANY PO ZAŁOŻENIU\n")
	comparison.pop()
	comparison.add_text("Slot: %s\n" % ShipInventory.MODULE_NAMES[module_index])
	comparison.add_text("Obecnie: %s\n\n" % ("%s • Poz. %d" % [equipped.definition.display_name, equipped.item_level] if equipped != null else "pusty"))
	comparison.add_text("Zmiana statystyk statku:\n")
	var rows := _inventory.get_item_comparison(item, equipped)
	if rows.is_empty():
		comparison.add_text("Bez zmian w bonusach.\n")
	for row in rows:
		comparison.push_color(Color("79e6a0") if row["delta"] > 0.0 else Color("ff8989"))
		var name: String = row["name"]
		comparison.add_text("%s: %+.2f %s\n" % [name, row["delta"], row["unit"]])
		comparison.pop()
	comparison.push_color(Color("8298ad"))
	comparison.push_font_size(10)
	comparison.add_text("\nUwzględnia utratę bonusów zdejmowanego przedmiotu.")
	comparison.pop()
	comparison.pop()

func _comparison_label(text_value: String, width: float, color: Color = Color("f1f4f8")) -> Label:
	var label := Label.new()
	label.text = text_value
	label.custom_minimum_size.x = width
	label.add_theme_font_size_override("font_size", 10)
	label.add_theme_color_override("font_color", color)
	label.mouse_filter = Control.MOUSE_FILTER_IGNORE
	return label

func _comparison_delta(value: float) -> Label:
	var label := _comparison_label(("%+.2f" % value).replace(".", ",") if not is_zero_approx(value) else "—", 64, Color("79e6a0") if value > 0.0 else (Color("ff8989") if value < 0.0 else Color("82909e")))
	label.horizontal_alignment = HORIZONTAL_ALIGNMENT_RIGHT
	return label

func _add_weapon_comparison(columns: HBoxContainer, item: ItemInstance) -> void:
	columns.add_child(VSeparator.new())
	var section := VBoxContainer.new()
	section.name = "WeaponComparison"
	section.add_theme_constant_override("separation", 6)
	columns.add_child(section)
	section.add_child(_comparison_label("ZMIANY PO WYMIANIE BRONI", 0, Color("91dbea")))
	var grid := GridContainer.new()
	grid.columns = 4
	grid.add_theme_constant_override("h_separation", 8)
	grid.add_theme_constant_override("v_separation", 4)
	section.add_child(grid)
	grid.add_child(_comparison_label("", 185))
	var comparisons: Array[Dictionary] = []
	for index in [0, 2, 1]:
		grid.add_child(_comparison_label("%d · %s" % [index + 1, ["LPM", "PPM", "ŚPM"][index]], 64, Color("91dbea")))
		comparisons.append(_inventory.get_weapon_comparison(item, index))
	grid.add_child(_comparison_label("DPS broni", 185, Color("ffd166")))
	for comparison in comparisons:
		grid.add_child(_comparison_delta(comparison["dps_delta"]))
	var keys := {}
	for comparison in comparisons:
		for row in comparison["stats"]:
			keys[row["key"]] = row
	for key in keys:
		var row: Dictionary = keys[key]
		var compact_name: String = {"missile_cooldown_reduction": "Skróc. cooldownu rakiet", "critical_damage_percent": "Obraż. krytyczne", "energy_regeneration": "Regener. energii", "shield_regeneration": "Regener. tarcz", "shield_on_damage_percent": "Odzysk tarcz z obr."}.get(key, row["name"])
		var caption: Label = _comparison_label("%s (%s)" % [compact_name, row["unit"]], 185)
		caption.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
		caption.custom_minimum_size.x = 185
		caption.size_flags_horizontal = Control.SIZE_FILL
		grid.add_child(caption)
		for comparison in comparisons:
			var delta := 0.0
			for change in comparison["stats"]:
				if change["key"] == key:
					delta = float(change["delta"])
					break
			grid.add_child(_comparison_delta(delta))
	var note := _comparison_label("Średni DPS z krytykami i cooldownem.\nBez ograniczeń energii i amunicji.\nAddony uwzględniają zdjęcie obecnej broni.", 0, Color("a0b2c4"))
	note.add_theme_font_size_override("font_size", 10)
	section.add_child(note)

func _get_drag_data(_at_position: Vector2) -> Variant:
	if not _inventory:
		return null
	var item: ItemInstance = _inventory.get_item(slot_kind, slot_index)
	if item == null:
		return null
	# Native preview lives in the viewport's base canvas, below HUD CanvasLayers.
	# Keep its drag lifecycle, but draw the centered icon in a dedicated top layer.
	var overlay := get_tree().get_first_node_in_group("item_drag_overlay")
	if overlay == null:
		overlay = CanvasLayer.new()
		overlay.name = "ItemDragOverlay"
		overlay.set_script(preload("res://scripts/ui/item_drag_overlay.gd"))
		var host := get_tree().current_scene
		if host == null:
			host = get_viewport()
		host.add_child(overlay)
	overlay.call("begin_drag", item)
	var native_preview := Control.new()
	native_preview.mouse_filter = Control.MOUSE_FILTER_IGNORE
	set_drag_preview(native_preview)
	return {"from_kind": slot_kind, "from_index": slot_index}

func _can_drop_data(_at_position: Vector2, data: Variant) -> bool:
	return (
		_inventory != null
		and data is Dictionary
		and _inventory.can_move_item(
			str(data.get("from_kind", "")),
			int(data.get("from_index", -1)),
			slot_kind,
			slot_index
		)
	)

func _drop_data(_at_position: Vector2, data: Variant) -> void:
	_inventory.move_item(
		str(data.get("from_kind", "")),
		int(data.get("from_index", -1)),
		slot_kind,
		slot_index
	)

func _has_missile() -> bool:
	if _inventory == null or slot_kind != "weapon":
		return false
	var item := _inventory.get_item(slot_kind, slot_index)
	return item != null and item.definition.weapon_kind == ItemDefinition.WeaponKind.MISSILE

func _empty_slot_text() -> String:
	if slot_kind == "weapon":
		return "BROŃ [%s]" % ["LPM", "PPM", "ŚPM"][slot_index]
	if slot_kind == "module":
		return ShipInventory.MODULE_NAMES[slot_index].to_upper()
	if slot_kind == "extension":
		return "ROZSZ. [%d]" % (slot_index + 1)
	return "PUSTY"

func _category_name(category: int) -> String:
	match category:
		ItemDefinition.Category.WEAPON:
			return "BROŃ"
		ItemDefinition.Category.SHIELD:
			return "TARCZA"
		ItemDefinition.Category.ARMOR:
			return "PANCERZ"
		ItemDefinition.Category.REACTOR:
			return "REAKTOR"
		ItemDefinition.Category.ENGINE:
			return "SILNIK"
		ItemDefinition.Category.COMPUTER:
			return "KOMPUTER"
		ItemDefinition.Category.ACTIVE_EXTENSION:
			return "ROZSZERZENIE"
		ItemDefinition.Category.CONSUMABLE:
			return "ZUŻYWALNY"
	return "PRZEDMIOT"

func _stat_text(item: ItemInstance) -> String:
	var definition := item.definition
	if definition.category == ItemDefinition.Category.CONSUMABLE:
		return "[R] +10% energii"
	if definition.category == ItemDefinition.Category.WEAPON:
		return "%s · Poz. %d" % [item.get_damage_range_text(), item.item_level]
	if definition.primary_stat.is_empty():
		return "Poz. %d" % item.item_level
	var total_value := item.get_stat_total(definition.primary_stat)
	var sign_text := "+" if total_value >= 0.0 else ""
	return "%s%.0f%s · Poz. %d" % [sign_text, total_value, definition.stat_suffix, item.item_level]

func _empty_icon() -> Texture2D:
	if slot_kind != "module":
		return null
	var names := ["shield", "armor", "engine", "reactor", "computer"]
	return load("res://assets/icons/%s.png" % names[slot_index]) as Texture2D