extends Control
class_name MarketplaceUI
## Marketplace Browse & Buy UI panel.
##
## Displays:
## - Search bar with keyword, item type, and price filters
## - Marketplace active listings cards
## - Item details and direct atomic purchase flow
## - Wallet balance and real-time status feedback
##
## docs/planning/economy.md US-6 (task 9797a0cfd9e6).

signal back_requested
signal item_purchased(listing_id: int)

@onready var back_button: Button = $VBox/HeaderHBox/BackButton
@onready var refresh_button: Button = $VBox/HeaderHBox/RefreshButton
@onready var balance_label: Label = $VBox/HeaderHBox/BalanceLabel
@onready var status_label: Label = $VBox/StatusLabel

# Filter inputs
@onready var search_edit: LineEdit = $VBox/FilterBar/SearchEdit
@onready var type_option: OptionButton = $VBox/FilterBar/TypeOption
@onready var min_price_edit: LineEdit = $VBox/FilterBar/MinPriceEdit
@onready var max_price_edit: LineEdit = $VBox/FilterBar/MaxPriceEdit
@onready var search_btn: Button = $VBox/FilterBar/SearchBtn

# Listings container
@onready var listings_container: GridContainer = $VBox/Scroll/ListingsGrid

var _api_client: Node = null


func _ready() -> void:
	_api_client = _get_api()
	_setup_type_options()
	_wire_signals()
	if _api_client != null and _api_client.has_token():
		refresh_balance()
		search_listings()


func _get_api() -> Node:
	if has_node("/root/ApiClient"):
		return get_node("/root/ApiClient")
	return null


func _setup_type_options() -> void:
	if not type_option:
		return
	type_option.clear()
	type_option.add_item("All Types", 0)
	type_option.add_item("Avatar Item", 1)
	type_option.add_item("Asset", 2)
	type_option.add_item("Experience Pass", 3)


func _wire_signals() -> void:
	if back_button and not back_button.pressed.is_connected(_on_back_pressed):
		back_button.pressed.connect(_on_back_pressed)
	if refresh_button and not refresh_button.pressed.is_connected(refresh_all):
		refresh_button.pressed.connect(refresh_all)
	if search_btn and not search_btn.pressed.is_connected(search_listings):
		search_btn.pressed.connect(search_listings)
	if search_edit and not search_edit.text_submitted.is_connected(func(_txt): search_listings()):
		search_edit.text_submitted.connect(func(_txt): search_listings())


func _on_back_pressed() -> void:
	back_requested.emit()
	if get_tree() and get_tree().current_scene == self:
		get_tree().change_scene_to_file("res://scenes/main_menu.tscn")


func show_status(text: String, is_error: bool = false) -> void:
	if not status_label:
		return
	status_label.text = text
	if is_error:
		status_label.add_theme_color_override("font_color", Color(1.0, 0.3, 0.3))
	else:
		status_label.add_theme_color_override("font_color", Color(0.3, 0.9, 0.3))


func refresh_all() -> void:
	refresh_balance()
	search_listings()


func refresh_balance() -> void:
	var api = _get_api()
	if not api or not api.has_token():
		return
	var res: Dictionary = await EconomyApiClient.get_wallet(api)
	if res.ok and res.data is Dictionary:
		var balance: int = int(res.data.get("balance", 0))
		if balance_label:
			balance_label.text = "Wallet: %d CR" % balance


func search_listings() -> void:
	var api = _get_api()
	if not api:
		return

	var q: String = search_edit.text.strip_edges() if search_edit else ""
	var item_type: String = ""
	if type_option and type_option.selected > 0:
		match type_option.selected:
			1: item_type = "avatar_item"
			2: item_type = "asset"
			3: item_type = "experience_pass"

	var min_price: int = -1
	if min_price_edit and min_price_edit.text.is_valid_int():
		min_price = min_price_edit.text.to_int()

	var max_price: int = -1
	if max_price_edit and max_price_edit.text.is_valid_int():
		max_price = max_price_edit.text.to_int()

	show_status("Loading listings...")
	var res: Dictionary = await EconomyApiClient.search_listings(api, q, item_type, min_price, max_price)
	if res.ok and res.data is Dictionary:
		var items: Array = res.data.get("listings", [])
		render_listings(items)
		show_status("Found %d active listings" % items.size())
	else:
		show_status("Search failed: " + res.detail, true)


func render_listings(listings: Array) -> void:
	if not listings_container:
		return

	for c in listings_container.get_children():
		listings_container.remove_child(c)
		c.queue_free()

	if listings.is_empty():
		var empty_lbl := Label.new()
		empty_lbl.text = "No listings matching your search."
		empty_lbl.add_theme_color_override("font_color", Color(0.6, 0.6, 0.6))
		listings_container.add_child(empty_lbl)
		return

	for l in listings:
		if not l is Dictionary:
			continue
		var card := _create_listing_card(l)
		listings_container.add_child(card)


func _create_listing_card(listing: Dictionary) -> Control:
	var card := PanelContainer.new()
	card.custom_minimum_size = Vector2(240, 200)

	var margin := MarginContainer.new()
	margin.add_theme_constant_override("margin_left", 12)
	margin.add_theme_constant_override("margin_top", 12)
	margin.add_theme_constant_override("margin_right", 12)
	margin.add_theme_constant_override("margin_bottom", 12)
	card.add_child(margin)

	var vbox := VBoxContainer.new()
	vbox.add_theme_constant_override("separation", 8)
	margin.add_child(vbox)

	var cat_item: Dictionary = listing.get("catalog_item", {})
	var title_lbl := Label.new()
	title_lbl.text = str(cat_item.get("name", "Unnamed Item"))
	title_lbl.add_theme_font_size_override("font_size", 16)
	vbox.add_child(title_lbl)

	var type_lbl := Label.new()
	var itype: String = str(cat_item.get("item_type", "")).replace("_", " ").capitalize()
	type_lbl.text = itype
	type_lbl.add_theme_color_override("font_color", Color(0.4, 0.7, 1.0))
	type_lbl.add_theme_font_size_override("font_size", 12)
	vbox.add_child(type_lbl)

	var seller_lbl := Label.new()
	var seller_name: String = str(listing.get("seller_username", "Unknown"))
	seller_lbl.text = "By " + seller_name
	seller_lbl.add_theme_color_override("font_color", Color(0.6, 0.6, 0.6))
	seller_lbl.add_theme_font_size_override("font_size", 12)
	vbox.add_child(seller_lbl)

	var desc_lbl := Label.new()
	var desc: String = str(cat_item.get("description", ""))
	if desc.length() > 60:
		desc = desc.substr(0, 57) + "..."
	desc_lbl.text = desc
	desc_lbl.size_flags_vertical = Control.SIZE_EXPAND_FILL
	desc_lbl.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
	vbox.add_child(desc_lbl)

	var bottom_hbox := HBoxContainer.new()
	vbox.add_child(bottom_hbox)

	var price: int = int(listing.get("price", 0))
	var price_lbl := Label.new()
	price_lbl.text = "%d CR" % price
	price_lbl.add_theme_font_size_override("font_size", 16)
	price_lbl.add_theme_color_override("font_color", Color(1.0, 0.8, 0.2))
	price_lbl.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	bottom_hbox.add_child(price_lbl)

	var buy_btn := Button.new()
	buy_btn.text = "Buy"
	buy_btn.custom_minimum_size = Vector2(80, 32)
	var listing_id: int = int(listing.get("id", 0))
	buy_btn.pressed.connect(_on_buy_clicked.bind(listing_id, str(cat_item.get("name", "Item")), price))
	bottom_hbox.add_child(buy_btn)

	return card


func _on_buy_clicked(listing_id: int, item_name: String, price: int) -> void:
	var api = _get_api()
	if not api or not api.has_token():
		show_status("Please login to purchase items", true)
		return

	show_status("Purchasing '%s' for %d CR..." % [item_name, price])
	var res: Dictionary = await EconomyApiClient.purchase_listing(api, listing_id)
	if res.ok:
		show_status("Successfully purchased '%s'! Item added to inventory." % item_name)
		item_purchased.emit(listing_id)
		refresh_all()
	else:
		show_status("Purchase failed: " + res.detail, true)