extends Node
## Title screen: Continue, New World, Load World (with delete), Quit.
## The island itself, in menu mode, slowly flies past in the background.

const UITheme = preload("res://scripts/ui/theme.gd")
const WORLD_SCENE := "res://scenes/world.tscn"

var _pages: Dictionary = {}     ## name -> Control
var _name_edit: LineEdit
var _seed_edit: LineEdit
var _list: VBoxContainer
var _armed_delete := ""

func _ready() -> void:
	Saves.current_id = ""
	get_tree().auto_accept_quit = true
	get_tree().paused = false
	Input.mouse_mode = Input.MOUSE_MODE_VISIBLE

	var backdrop: Node3D = load(WORLD_SCENE).instantiate()
	backdrop.menu_mode = true
	add_child(backdrop)
	# The backdrop's (disabled) player captures the mouse in its _ready; take
	# it back, or the menu can't be clicked.
	Input.mouse_mode = Input.MOUSE_MODE_VISIBLE

	var ui := CanvasLayer.new()
	ui.layer = 10
	add_child(ui)
	var root := Control.new()
	root.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
	ui.add_child(root)

	# Soft vignette on the left so the text reads over the scenery.
	var shade := TextureRect.new()
	var g := Gradient.new()
	g.offsets = PackedFloat32Array([0.0, 1.0])
	g.colors = PackedColorArray([Color(0, 0, 0, 0.6), Color(0, 0, 0, 0)])
	var gt := GradientTexture2D.new()
	gt.gradient = g
	gt.fill_to = Vector2(1, 0)
	shade.texture = gt
	shade.set_anchors_and_offsets_preset(Control.PRESET_LEFT_WIDE)
	shade.offset_right = 720
	shade.mouse_filter = Control.MOUSE_FILTER_IGNORE
	root.add_child(shade)

	var col := VBoxContainer.new()
	col.set_anchors_and_offsets_preset(Control.PRESET_LEFT_WIDE)
	col.offset_left = 70
	col.offset_top = 90
	col.offset_right = 520
	col.add_theme_constant_override("separation", 14)
	root.add_child(col)
	col.add_child(UITheme.label("VALHEIMLIKE", 54))
	col.add_child(UITheme.label("Survive the island. Build a home.", 18, UITheme.TEXT_DIM))
	var spacer := Control.new()
	spacer.custom_minimum_size = Vector2(0, 24)
	col.add_child(spacer)

	_pages["main"] = _main_page()
	_pages["new"] = _new_page()
	_pages["load"] = _load_page()
	for p in _pages.values():
		col.add_child(p)
	_show("main")
	_maybe_capture()

## Dev hook, same as world.gd: `-- --shot=/abs/prefix` saves the title pages.
func _maybe_capture() -> void:
	var prefix := ""
	for a in OS.get_cmdline_user_args():
		if a.begins_with("--shot="):
			prefix = a.trim_prefix("--shot=")
	if prefix.is_empty():
		return
	await get_tree().create_timer(1.0).timeout
	print("[title] mouse mode: %s" % ["visible", "hidden", "captured", "confined"][Input.mouse_mode])
	for page in ["main", "new", "load"]:
		_show(page)
		await get_tree().create_timer(4.0 if page == "main" else 0.5).timeout
		await RenderingServer.frame_post_draw
		get_viewport().get_texture().get_image().save_png("%s_title_%s.png" % [prefix, page])
		print("[title] saved %s_title_%s.png" % [prefix, page])
	get_tree().quit()

func _unhandled_input(event: InputEvent) -> void:
	if event is InputEventKey and event.pressed and event.keycode == KEY_ESCAPE and not _pages["main"].visible:
		_show("main")

func _show(page: String) -> void:
	for k in _pages:
		_pages[k].visible = k == page
	_armed_delete = ""
	if page == "load":
		_fill_list()
	elif page == "new":
		_name_edit.text = _unique_name()
		_seed_edit.text = ""
		_name_edit.grab_focus()
		_name_edit.select_all()

func _button(text: String, cb: Callable, min_w: int = 320) -> Button:
	var b := Button.new()
	b.text = text
	b.focus_mode = Control.FOCUS_NONE
	b.custom_minimum_size = Vector2(min_w, 46)
	b.add_theme_font_size_override("font_size", 19)
	b.alignment = HORIZONTAL_ALIGNMENT_LEFT
	b.pressed.connect(cb)
	return b

func _main_page() -> Control:
	var v := VBoxContainer.new()
	v.add_theme_constant_override("separation", 10)
	var worlds := Saves.list_worlds()
	if not worlds.is_empty():
		var w: Dictionary = worlds[0]
		v.add_child(_button("Continue: %s" % w.name, _play.bind(w.id)))
	v.add_child(_button("New World", _show.bind("new")))
	var lb := _button("Load World", _show.bind("load"))
	lb.disabled = worlds.is_empty()
	v.add_child(lb)
	v.add_child(_button("Quit", get_tree().quit))
	return v

func _new_page() -> Control:
	var p := UITheme.panel()
	var v := VBoxContainer.new()
	v.add_theme_constant_override("separation", 8)
	p.add_child(v)
	v.add_child(UITheme.label("New World", 24))
	v.add_child(UITheme.label("Name", 15, UITheme.TEXT_DIM))
	_name_edit = LineEdit.new()
	_name_edit.custom_minimum_size = Vector2(360, 40)
	_name_edit.max_length = 32
	_name_edit.text_submitted.connect(func(_t): _create())
	v.add_child(_name_edit)
	v.add_child(UITheme.label("Seed (blank = random island, 1337 = the original)", 15, UITheme.TEXT_DIM))
	_seed_edit = LineEdit.new()
	_seed_edit.placeholder_text = "random"
	_seed_edit.custom_minimum_size = Vector2(360, 40)
	_seed_edit.text_submitted.connect(func(_t): _create())
	v.add_child(_seed_edit)
	var h := HBoxContainer.new()
	h.add_theme_constant_override("separation", 10)
	h.add_child(_button("Create & Play", _create, 170))
	h.add_child(_button("Back", _show.bind("main"), 120))
	v.add_child(h)
	return p

func _load_page() -> Control:
	var p := UITheme.panel()
	var v := VBoxContainer.new()
	v.add_theme_constant_override("separation", 8)
	p.add_child(v)
	v.add_child(UITheme.label("Load World", 24))
	var scroll := ScrollContainer.new()
	scroll.custom_minimum_size = Vector2(460, 320)
	scroll.horizontal_scroll_mode = ScrollContainer.SCROLL_MODE_DISABLED
	_list = VBoxContainer.new()
	_list.size_flags_horizontal = Control.SIZE_EXPAND_FILL
	_list.add_theme_constant_override("separation", 6)
	scroll.add_child(_list)
	v.add_child(scroll)
	v.add_child(_button("Back", _show.bind("main"), 120))
	return p

func _fill_list() -> void:
	for c in _list.get_children():
		c.queue_free()
	var worlds := Saves.list_worlds()
	if worlds.is_empty():
		_list.add_child(UITheme.label("No worlds yet.", 16, UITheme.TEXT_DIM))
		return
	for w in worlds:
		var row := PanelContainer.new()
		row.add_theme_stylebox_override("panel", UITheme.box(UITheme.SLOT_BG, UITheme.SLOT_BORDER, 1, 5, 8))
		var h := HBoxContainer.new()
		h.add_theme_constant_override("separation", 8)
		row.add_child(h)
		var info := VBoxContainer.new()
		info.size_flags_horizontal = Control.SIZE_EXPAND_FILL
		info.add_child(UITheme.label(w.name, 18))
		var played := int(w.get("play_time", 0.0))
		var when := Time.get_datetime_string_from_unix_time(int(w.get("last_played", 0)), true)
		info.add_child(UITheme.label("seed %d  ·  played %dh %02dm  ·  %s" % [int(w.seed), played / 3600, (played / 60) % 60, when], 13, UITheme.TEXT_DIM))
		h.add_child(info)
		h.add_child(_button("Play", _play.bind(w.id), 80))
		var del := Button.new()
		del.text = "Delete"
		del.focus_mode = Control.FOCUS_NONE
		del.custom_minimum_size = Vector2(90, 46)
		del.add_theme_font_size_override("font_size", 19)
		del.pressed.connect(_on_delete.bind(w.id, del))
		h.add_child(del)
		_list.add_child(row)

func _on_delete(id: String, b: Button) -> void:
	if _armed_delete != id:
		_armed_delete = id
		b.text = "Sure?"
		return
	Saves.delete_world(id)
	_armed_delete = ""
	_fill_list()
	if Saves.list_worlds().is_empty():
		_rebuild_main()

func _rebuild_main() -> void:
	var old: Control = _pages["main"]
	var parent := old.get_parent()
	var idx := old.get_index()
	old.queue_free()
	_pages["main"] = _main_page()
	parent.add_child(_pages["main"])
	parent.move_child(_pages["main"], idx)
	_pages["main"].visible = false

func _unique_name() -> String:
	var names := Saves.list_worlds().map(func(w): return w.name)
	var n := names.size() + 1
	var base := "Island"
	while ("%s %d" % [base, n]) in names:
		n += 1
	return "%s %d" % [base, n]

func _create() -> void:
	var world_name := _name_edit.text.strip_edges()
	if world_name.is_empty():
		world_name = _unique_name()
	var seed_text := _seed_edit.text.strip_edges()
	var seed := int(seed_text) if seed_text.is_valid_int() else (seed_text.hash() if not seed_text.is_empty() else randi())
	_play(Saves.create_world(world_name, seed))

func _play(id: String) -> void:
	Saves.current_id = id
	get_tree().change_scene_to_file(WORLD_SCENE)