feat(godot): discovery & home UI with search, categories, sorting, pagination, and world entry

scenes/discovery_ui.tscn

@@ -0,0 +1,150 @@
+[gd_scene load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://scripts/discovery_ui.gd" id="1_disc"]
+
+[node name="DiscoveryUI" type="Control"]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+script = ExtResource("1_disc")
+
+[node name="VBox" type="VBoxContainer" parent="."]
+layout_mode = 1
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+offset_left = 32.0
+offset_top = 24.0
+offset_right = -32.0
+offset_bottom = -24.0
+grow_horizontal = 2
+grow_vertical = 2
+theme_override_constants/separation = 12
+
+[node name="Header" type="HBoxContainer" parent="VBox"]
+layout_mode = 2
+theme_override_constants/separation = 16
+
+[node name="BackButton" type="Button" parent="VBox/Header"]
+custom_minimum_size = Vector2(100, 36)
+layout_mode = 2
+text = "< Back"
+
+[node name="TitleLabel" type="Label" parent="VBox/Header"]
+layout_mode = 2
+size_flags_horizontal = 3
+theme_override_font_sizes/font_size = 26
+text = "Discover Experiences"
+horizontal_alignment = 1
+
+[node name="RefreshButton" type="Button" parent="VBox/Header"]
+custom_minimum_size = Vector2(100, 36)
+layout_mode = 2
+text = "Refresh"
+
+[node name="StatusLabel" type="Label" parent="VBox"]
+visible = false
+layout_mode = 2
+theme_override_colors/font_color = Color(1, 0.3, 0.3, 1)
+text = ""
+
+[node name="Filters" type="HBoxContainer" parent="VBox"]
+layout_mode = 2
+theme_override_constants/separation = 10
+
+[node name="SearchEdit" type="LineEdit" parent="VBox/Filters"]
+custom_minimum_size = Vector2(240, 36)
+layout_mode = 2
+placeholder_text = "Search by name or tag..."
+
+[node name="CategoryOption" type="OptionButton" parent="VBox/Filters"]
+custom_minimum_size = Vector2(160, 36)
+layout_mode = 2
+
+[node name="SortOption" type="OptionButton" parent="VBox/Filters"]
+custom_minimum_size = Vector2(140, 36)
+layout_mode = 2
+
+[node name="FilterButton" type="Button" parent="VBox/Filters"]
+custom_minimum_size = Vector2(90, 36)
+layout_mode = 2
+text = "Filter"
+
+[node name="Content" type="Control" parent="VBox"]
+layout_mode = 2
+size_flags_vertical = 3
+
+[node name="LoadingLabel" type="Label" parent="VBox/Content"]
+visible = false
+layout_mode = 1
+anchors_preset = 14
+anchor_top = 0.5
+anchor_right = 1.0
+anchor_bottom = 0.5
+offset_top = -12.0
+offset_bottom = 12.0
+text = "Loading experiences..."
+horizontal_alignment = 1
+
+[node name="ErrorLabel" type="Label" parent="VBox/Content"]
+visible = false
+layout_mode = 1
+anchors_preset = 14
+anchor_top = 0.5
+anchor_right = 1.0
+anchor_bottom = 0.5
+offset_top = -12.0
+offset_bottom = 12.0
+theme_override_colors/font_color = Color(1, 0.4, 0.4, 1)
+text = ""
+horizontal_alignment = 1
+
+[node name="EmptyLabel" type="Label" parent="VBox/Content"]
+visible = false
+layout_mode = 1
+anchors_preset = 14
+anchor_top = 0.5
+anchor_right = 1.0
+anchor_bottom = 0.5
+offset_top = -12.0
+offset_bottom = 12.0
+theme_override_colors/font_color = Color(0.7, 0.7, 0.7, 1)
+text = "No experiences found."
+horizontal_alignment = 1
+
+[node name="Scroll" type="ScrollContainer" parent="VBox/Content"]
+layout_mode = 1
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+
+[node name="WorldsVBox" type="VBoxContainer" parent="VBox/Content/Scroll"]
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 3
+theme_override_constants/separation = 10
+
+[node name="Pagination" type="HBoxContainer" parent="VBox"]
+layout_mode = 2
+theme_override_constants/separation = 16
+alignment = 1
+
+[node name="PrevButton" type="Button" parent="VBox/Pagination"]
+custom_minimum_size = Vector2(90, 32)
+layout_mode = 2
+text = "< Prev"
+
+[node name="PageLabel" type="Label" parent="VBox/Pagination"]
+layout_mode = 2
+text = "Page 1 of 1"
+horizontal_alignment = 1
+
+[node name="NextButton" type="Button" parent="VBox/Pagination"]
+custom_minimum_size = Vector2(90, 32)
+layout_mode = 2
+text = "Next >"

scripts/discovery_ui.gd

@@ -0,0 +1,376 @@
+extends Control
+class_name DiscoveryUI
+## Discovery & Home Screen for browsing, searching, and entering experiences.
+##
+## docs/planning/discovery.md (task b77bddf31ba5).
+
+signal back_requested
+signal world_selected(world_id: int)
+signal worlds_loaded(count: int)
+
+@onready var back_button: Button = $VBox/Header/BackButton
+@onready var refresh_button: Button = $VBox/Header/RefreshButton
+@onready var status_label: Label = $VBox/StatusLabel
+
+# Filter Controls
+@onready var search_edit: LineEdit = $VBox/Filters/SearchEdit
+@onready var category_option: OptionButton = $VBox/Filters/CategoryOption
+@onready var sort_option: OptionButton = $VBox/Filters/SortOption
+@onready var filter_button: Button = $VBox/Filters/FilterButton
+
+# Content
+@onready var loading_label: Label = $VBox/Content/LoadingLabel
+@onready var error_label: Label = $VBox/Content/ErrorLabel
+@onready var empty_label: Label = $VBox/Content/EmptyLabel
+@onready var worlds_container: VBoxContainer = $VBox/Content/Scroll/WorldsVBox
+
+# Pagination
+@onready var prev_button: Button = $VBox/Pagination/PrevButton
+@onready var next_button: Button = $VBox/Pagination/NextButton
+@onready var page_label: Label = $VBox/Pagination/PageLabel
+
+var _api_client: Node = null
+var _current_page: int = 0
+var _page_size: int = 10
+var _total_count: int = 0
+var _loaded_worlds: Array[DiscoveryApiClient.WorldSummary] = []
+
+
+func _ready() -> void:
+	_api_client = _get_api()
+	_wire_signals()
+	_setup_sort_options()
+	_setup_initial_ui_state()
+
+	# Populate categories then load initial worlds feed
+	await load_categories()
+	await load_worlds(0)
+
+
+func _get_api() -> Node:
+	if has_node("/root/ApiClient"):
+		return get_node("/root/ApiClient")
+	var api_script = load("res://scripts/api_client.gd")
+	if api_script:
+		var api = api_script.new()
+		add_child(api)
+		return api
+	return null
+
+
+func _setup_initial_ui_state() -> void:
+	if loading_label: loading_label.visible = false
+	if error_label: error_label.visible = false
+	if empty_label: empty_label.visible = false
+	if prev_button: prev_button.disabled = true
+	if next_button: next_button.disabled = true
+	if page_label: page_label.text = "Page 1"
+
+
+func _setup_sort_options() -> void:
+	if not sort_option:
+		return
+	sort_option.clear()
+	sort_option.add_item("Newest", 0)
+	sort_option.add_item("Most Played", 1)
+	sort_option.add_item("Trending", 2)
+	sort_option.selected = 0
+
+
+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(_on_refresh_pressed):
+		refresh_button.pressed.connect(_on_refresh_pressed)
+	if filter_button and not filter_button.pressed.is_connected(_on_filter_pressed):
+		filter_button.pressed.connect(_on_filter_pressed)
+	if search_edit and not search_edit.text_submitted.is_connected(_on_search_submitted):
+		search_edit.text_submitted.connect(_on_search_submitted)
+	if category_option and not category_option.item_selected.is_connected(_on_category_selected):
+		category_option.item_selected.connect(_on_category_selected)
+	if sort_option and not sort_option.item_selected.is_connected(_on_sort_selected):
+		sort_option.item_selected.connect(_on_sort_selected)
+	if prev_button and not prev_button.pressed.is_connected(_on_prev_page_pressed):
+		prev_button.pressed.connect(_on_prev_page_pressed)
+	if next_button and not next_button.pressed.is_connected(_on_next_page_pressed):
+		next_button.pressed.connect(_on_next_page_pressed)
+
+
+func load_categories() -> void:
+	if not category_option:
+		return
+	category_option.clear()
+	category_option.add_item("All Categories", 0)
+
+	if _api_client == null:
+		return
+
+	var res: Dictionary = await DiscoveryApiClient.get_categories(_api_client)
+	if res.ok and res.data is Array:
+		var idx := 1
+		for cat in res.data:
+			var cat_str := str(cat).strip_edges()
+			if cat_str != "":
+				category_option.add_item(cat_str, idx)
+				idx += 1
+
+
+func load_worlds(page: int = 0) -> void:
+	_current_page = page
+	if loading_label: loading_label.visible = true
+	if error_label: error_label.visible = false
+	if empty_label: empty_label.visible = false
+
+	var q := search_edit.text.strip_edges() if search_edit else ""
+	var category := ""
+	if category_option and category_option.selected > 0:
+		category = category_option.get_item_text(category_option.selected)
+
+	var sort := "newest"
+	if sort_option:
+		match sort_option.selected:
+			0: sort = "newest"
+			1: sort = "most_played"
+			2: sort = "trending"
+
+	var skip := _current_page * _page_size
+	var res: Dictionary = await DiscoveryApiClient.get_worlds(
+		_api_client,
+		q,
+		[],
+		category,
+		sort,
+		skip,
+		_page_size
+	)
+
+	if loading_label: loading_label.visible = false
+
+	if not res.ok:
+		if error_label:
+			error_label.text = "Error: %s" % res.detail
+			error_label.visible = true
+		_clear_container()
+		return
+
+	var parsed: DiscoveryApiClient.DiscoveryResult = res.get("parsed")
+	if parsed == null and res.data is Dictionary:
+		parsed = DiscoveryApiClient.DiscoveryResult.from_dict(res.data)
+
+	if parsed == null:
+		if error_label:
+			error_label.text = "Invalid discovery response"
+			error_label.visible = true
+		_clear_container()
+		return
+
+	_total_count = parsed.total
+	_loaded_worlds = parsed.items
+
+	_render_worlds(_loaded_worlds)
+	_update_pagination()
+	worlds_loaded.emit(_loaded_worlds.size())
+
+
+func _clear_container() -> void:
+	if not worlds_container:
+		return
+	for c in worlds_container.get_children():
+		worlds_container.remove_child(c)
+		c.queue_free()
+
+
+func _render_worlds(worlds: Array[DiscoveryApiClient.WorldSummary]) -> void:
+	_clear_container()
+
+	if worlds.is_empty():
+		if empty_label:
+			empty_label.text = "No experiences found matching your criteria."
+			empty_label.visible = true
+		return
+
+	if empty_label: empty_label.visible = false
+
+	for world in worlds:
+		var card := _create_world_card(world)
+		worlds_container.add_child(card)
+
+
+func _create_world_card(world: DiscoveryApiClient.WorldSummary) -> Control:
+	var panel := PanelContainer.new()
+	panel.size_flags_horizontal = Control.SIZE_EXPAND_FILL
+	panel.custom_minimum_size = Vector2(0, 90)
+
+	var style := StyleBoxFlat.new()
+	style.bg_color = Color(0.14, 0.16, 0.20, 1.0)
+	style.corner_radius_top_left = 6
+	style.corner_radius_top_right = 6
+	style.corner_radius_bottom_left = 6
+	style.corner_radius_bottom_right = 6
+	style.content_margin_left = 16
+	style.content_margin_right = 16
+	style.content_margin_top = 10
+	style.content_margin_bottom = 10
+	panel.add_theme_stylebox_override("panel", style)
+
+	var vbox := VBoxContainer.new()
+	vbox.size_flags_horizontal = Control.SIZE_EXPAND_FILL
+	vbox.add_theme_constant_override("separation", 4)
+	panel.add_child(vbox)
+
+	# Title & Category Row
+	var title_row := HBoxContainer.new()
+	var name_label := Label.new()
+	name_label.text = world.name
+	name_label.add_theme_font_size_override("font_size", 18)
+	name_label.add_theme_color_override("font_color", Color(1.0, 1.0, 1.0, 1.0))
+	title_row.add_child(name_label)
+
+	if world.category != "":
+		var cat_label := Label.new()
+		cat_label.text = "  [%s]" % world.category
+		cat_label.add_theme_font_size_override("font_size", 14)
+		cat_label.add_theme_color_override("font_color", Color(0.4, 0.7, 1.0, 1.0))
+		title_row.add_child(cat_label)
+
+	var spacer := Control.new()
+	spacer.size_flags_horizontal = Control.SIZE_EXPAND_FILL
+	title_row.add_child(spacer)
+
+	# Enter World Button
+	var enter_button := Button.new()
+	enter_button.text = "Enter World"
+	enter_button.custom_minimum_size = Vector2(110, 30)
+	enter_button.pressed.connect(_on_enter_world_pressed.bind(world.id, enter_button))
+	title_row.add_child(enter_button)
+	vbox.add_child(title_row)
+
+	# Description
+	var desc_label := Label.new()
+	desc_label.text = world.description if world.description != "" else "No description provided."
+	desc_label.autowrap_mode = TextServer.AUTOWRAP_WORD
+	desc_label.add_theme_font_size_override("font_size", 13)
+	desc_label.add_theme_color_override("font_color", Color(0.75, 0.75, 0.75, 1.0))
+	vbox.add_child(desc_label)
+
+	# Metadata Row: Tags, Plays, Owner
+	var meta_row := HBoxContainer.new()
+	meta_row.add_theme_constant_override("separation", 16)
+
+	var play_label := Label.new()
+	play_label.text = "%d plays" % world.play_count
+	play_label.add_theme_font_size_override("font_size", 12)
+	play_label.add_theme_color_override("font_color", Color(0.6, 0.9, 0.6, 1.0))
+	meta_row.add_child(play_label)
+
+	if world.tags.size() > 0:
+		var tags_str: String = ""
+		for t in world.tags:
+			tags_str += "#" + str(t) + " "
+		var tags_label := Label.new()
+		tags_label.text = tags_str.strip_edges()
+		tags_label.add_theme_font_size_override("font_size", 12)
+		tags_label.add_theme_color_override("font_color", Color(0.8, 0.7, 0.4, 1.0))
+		meta_row.add_child(tags_label)
+
+	if world.owner_username != "":
+		var owner_label := Label.new()
+		owner_label.text = "Creator: %s" % world.owner_username
+		owner_label.add_theme_font_size_override("font_size", 12)
+		owner_label.add_theme_color_override("font_color", Color(0.6, 0.6, 0.6, 1.0))
+		meta_row.add_child(owner_label)
+
+	vbox.add_child(meta_row)
+
+	return panel
+
+
+func _update_pagination() -> void:
+	var total_pages := int(ceil(float(_total_count) / float(_page_size)))
+	if total_pages <= 0:
+		total_pages = 1
+
+	if page_label:
+		page_label.text = "Page %d of %d (%d experiences)" % [_current_page + 1, total_pages, _total_count]
+
+	if prev_button:
+		prev_button.disabled = (_current_page <= 0)
+	if next_button:
+		next_button.disabled = ((_current_page + 1) >= total_pages)
+
+
+func _on_enter_world_pressed(world_id: int, button: Button) -> void:
+	button.disabled = true
+	button.text = "Joining…"
+	world_selected.emit(world_id)
+
+	# 1. Record visit metric
+	if _api_client != null:
+		await DiscoveryApiClient.record_visit(_api_client, world_id)
+
+	# 2. Join flow (existing game server orchestration)
+	if _api_client != null and _api_client.has_method("join_world"):
+		var result: Dictionary = await _api_client.join_world(world_id)
+		if result.ok and result.data is Dictionary:
+			var d: Dictionary = result.data
+			if has_node("/root/Session"):
+				get_node("/root/Session").begin(world_id, str(d.get("host", "")), int(d.get("port", 0)))
+			get_tree().change_scene_to_file("res://scenes/game.tscn")
+			return
+
+		if result.status == 503:
+			# Dev fallback: local single-player
+			if has_node("/root/Session"):
+				get_node("/root/Session").clear()
+			get_tree().change_scene_to_file("res://scenes/game.tscn")
+			return
+
+		if status_label:
+			status_label.text = "Failed to join: " + str(result.detail)
+			status_label.visible = true
+	else:
+		# Fallback if standalone test or not wired
+		if has_node("/root/Session"):
+			get_node("/root/Session").clear()
+		get_tree().change_scene_to_file("res://scenes/game.tscn")
+		return
+
+	button.disabled = false
+	button.text = "Enter World"
+
+
+func _on_filter_pressed() -> void:
+	load_worlds(0)
+
+
+func _on_search_submitted(_new_text: String) -> void:
+	load_worlds(0)
+
+
+func _on_category_selected(_index: int) -> void:
+	load_worlds(0)
+
+
+func _on_sort_selected(_index: int) -> void:
+	load_worlds(0)
+
+
+func _on_refresh_pressed() -> void:
+	load_worlds(_current_page)
+
+
+func _on_prev_page_pressed() -> void:
+	if _current_page > 0:
+		load_worlds(_current_page - 1)
+
+
+func _on_next_page_pressed() -> void:
+	var total_pages := int(ceil(float(_total_count) / float(_page_size)))
+	if (_current_page + 1) < total_pages:
+		load_worlds(_current_page + 1)
+
+
+func _on_back_pressed() -> void:
+	back_requested.emit()
+	if get_tree():
+		get_tree().change_scene_to_file("res://scenes/main_menu.tscn")

scripts/smoke_test_discovery_ui.gd

@@ -0,0 +1,89 @@
+extends SceneTree
+## Headless smoke test for DiscoveryUI.
+
+func _initialize() -> void:
+	_run()
+
+func _run() -> void:
+	print("[SMOKE] Starting DiscoveryUI smoke test...")
+	await process_frame
+
+	var scene = load("res://scenes/discovery_ui.tscn")
+	if not scene:
+		printerr("[FAIL] Could not load res://scenes/discovery_ui.tscn")
+		quit(1)
+		return
+
+	var ui: DiscoveryUI = scene.instantiate()
+	root.add_child(ui)
+	await process_frame
+
+	# 1. Verify node references
+	assert(ui.search_edit != null, "search_edit is null")
+	assert(ui.category_option != null, "category_option is null")
+	assert(ui.sort_option != null, "sort_option is null")
+	assert(ui.filter_button != null, "filter_button is null")
+	assert(ui.worlds_container != null, "worlds_container is null")
+	assert(ui.prev_button != null, "prev_button is null")
+	assert(ui.next_button != null, "next_button is null")
+	assert(ui.page_label != null, "page_label is null")
+	print("[PASS] Node references verified")
+
+	# 2. Verify sort options
+	assert(ui.sort_option.item_count == 3, "sort_option should have 3 items")
+	assert(ui.sort_option.get_item_text(0) == "Newest", "sort 0 should be Newest")
+	assert(ui.sort_option.get_item_text(1) == "Most Played", "sort 1 should be Most Played")
+	assert(ui.sort_option.get_item_text(2) == "Trending", "sort 2 should be Trending")
+	print("[PASS] Sort options verified")
+
+	# 3. Verify category dropdown initial state
+	assert(ui.category_option.item_count >= 1, "category_option should have at least All Categories")
+	assert(ui.category_option.get_item_text(0) == "All Categories", "category 0 should be All Categories")
+	print("[PASS] Category dropdown verified")
+
+	# 4. Test rendering of WorldSummary cards
+	var mock_w := DiscoveryApiClient.WorldSummary.new()
+	mock_w.id = 101
+	mock_w.name = "Cyber Nexus"
+	mock_w.category = "Action"
+	mock_w.tags = ["cyberpunk", "pvp"]
+	mock_w.play_count = 256
+	mock_w.description = "A futuristic arena"
+	mock_w.owner_username = "neon_builder"
+
+	var mock_worlds: Array[DiscoveryApiClient.WorldSummary] = [mock_w]
+	ui._render_worlds(mock_worlds)
+	assert(ui.worlds_container.get_child_count() == 1, "Should render 1 card")
+	assert(ui.empty_label.visible == false, "empty_label should be hidden when items present")
+	print("[PASS] World card rendering verified")
+
+	# 5. Test empty state
+	var empty_list: Array[DiscoveryApiClient.WorldSummary] = []
+	ui._render_worlds(empty_list)
+	assert(ui.worlds_container.get_child_count() == 0, "Container should have 0 children")
+	assert(ui.empty_label.visible == true, "empty_label should be visible when empty")
+	print("[PASS] Empty state verified")
+
+	# 6. Test pagination logic
+	ui._total_count = 25
+	ui._page_size = 10
+	ui._current_page = 0
+	ui._update_pagination()
+	assert(ui.prev_button.disabled == true, "Page 0 prev_button should be disabled")
+	assert(ui.next_button.disabled == false, "Page 0 next_button should be enabled")
+	assert(ui.page_label.text.contains("Page 1 of 3"), "Page 1 of 3 mismatch: %s" % ui.page_label.text)
+
+	ui._current_page = 1
+	ui._update_pagination()
+	assert(ui.prev_button.disabled == false, "Page 1 prev_button should be enabled")
+	assert(ui.next_button.disabled == false, "Page 1 next_button should be enabled")
+
+	ui._current_page = 2
+	ui._update_pagination()
+	assert(ui.prev_button.disabled == false, "Page 2 prev_button should be enabled")
+	assert(ui.next_button.disabled == true, "Page 2 next_button should be disabled")
+	print("[PASS] Pagination logic verified")
+
+	ui.queue_free()
+	print("[SMOKE] DiscoveryUI smoke test PASSED")
+	quit(0)