extends Node
## Boot the client windowed, capture a few screens, and quit.
##
##   SHOT_DIR=/tmp/shots godot --path . res://tools/screenshot.tscn
##
## This exists because UI is the one part of the game the rest of the tooling
## cannot check. `check.sh` proves it parses, the suite proves the theme
## resolves, the smoke test proves nothing errors -- and all three passed
## while the entire interface rendered unstyled, because Godot's theme
## inheritance breaks at the first non-Control parent and nothing had ever
## looked at the screen.
##
## Needs a real display, so it is not part of any automated gate. Run it after
## touching anything under src/ui/ and open the files.

const GAME := preload("res://src/game.tscn")
## Frame numbers, not seconds: the point is a deterministic sequence, and a
## windowed client at 60fps gets there in about four seconds.
const AT_MENU := 30
const ENTER_GAME := 34
const AT_GAME := 200
const OPEN_MENU := 210
const AT_INGAME_MENU := 240
const OPEN_SETTINGS := 250
const AT_SETTINGS := 280
const OPEN_CREDITS := 290
const AT_CREDITS := 320
const OPEN_UPGRADES := 330
const AT_UPGRADES := 360
const OPEN_ROSTER := 370
const AT_ROSTER := 400
const DONE := 410

var _frame: int = 0
var _game: Node = null
var _menu: Control = null
var _dir: String = "user://"


func _ready() -> void:
	GameOpts.parse()
	Engine.physics_ticks_per_second = SimConfig.TICK_RATE
	Settings.load_and_apply()
	var from_env := OS.get_environment("SHOT_DIR")
	if not from_env.is_empty():
		_dir = from_env
	get_window().size = Vector2i(1280, 720)
	_menu = preload("res://src/ui/main_menu.gd").new()
	add_child(_menu)


## Put the player at the quartermaster on BOTH sides. Setting only the client's
## predicted position does not hold: reconciliation pulls it back to whatever
## the server says within a tick or two, the game scene notices it is no longer
## at the NPC, and closes the screen again.
func _stand_at_the_npc() -> void:
	var npc: Vector2 = Net.client.upgrade_npc
	Net.client.predicted_pos = npc
	var inst := Net.server.instance_of(Net.LOCAL_PEER)
	if inst != null:
		var p: SimPlayer = inst.world.players.get(Net.LOCAL_PEER)
		if p != null:
			p.pos = npc
	_game.set("_upgrades_open", true)


func _process(_delta: float) -> void:
	_frame += 1
	# Held until the shot is taken; one frame of it is not enough.
	if _frame > OPEN_UPGRADES and _frame <= AT_UPGRADES:
		_stand_at_the_npc()
	# Same reason: the game scene owns this screen's visibility too and decides
	# it every frame, so one assignment lasts exactly one frame.
	if _frame > OPEN_ROSTER and _frame <= AT_ROSTER:
		_show_the_roster()
	match _frame:
		AT_MENU:
			_grab("menu")
		ENTER_GAME:
			_menu.queue_free()
			Net.host(27455)
			Net.start_local_client()
			_game = GAME.instantiate()
			add_child(_game)
		AT_GAME:
			_grab("game")
		OPEN_MENU:
			_game.get_node("GameMenu").open()
		AT_INGAME_MENU:
			_grab("menu_ingame")
		OPEN_SETTINGS:
			_game.get_node("GameMenu").close()
			_game.get_node("SettingsScreen").open()
		AT_SETTINGS:
			_grab("settings")
		OPEN_CREDITS:
			_game.get_node("SettingsScreen").visible = false
			_game.get_node("CreditsScreen").open()
		AT_CREDITS:
			_grab("credits")
		OPEN_UPGRADES:
			# Driven with a made-up offer rather than by earning one: the point
			# here is the card layout, and levelling a character up first would
			# make the shot depend on a dungeon run.
			_game.get_node("CreditsScreen").visible = false
			# The game scene owns this screen's visibility and re-asserts it
			# every frame, closing it unless the player is at the NPC -- so
			# setting `visible` directly lasted exactly one frame. Stand the
			# player at the quartermaster and open it the way the game does.
			_stand_at_the_npc()
			var offer: Array[StringName] = [
				Upgrades.SPLIT_SHOT, Upgrades.POISON, Upgrades.ERASER]
			var taken: Array[StringName] = [Upgrades.SNIPER, Upgrades.SPREAD]
			_game.get_node("UpgradeScreen").refresh(2, offer, taken)
		AT_UPGRADES:
			_grab("upgrades")
		OPEN_ROSTER:
			_show_the_roster()
		AT_ROSTER:
			_grab("roster")
		DONE:
			Net.shutdown()
			get_tree().quit(0)


## Put the roster on screen with a made-up set of characters.
##
## Made up for the same reason the upgrade offer is: the point is the layout,
## and earning three characters at three different health levels first would
## make the shot depend on a dungeon run. One whole, one badly hurt, one barely
## alive -- health survives a run now, so the wounded rows are the reason this
## screen is worth a picture at all.
##
## Walking off the quartermaster first is not optional: the game scene re-opens
## the upgrade screen every frame the player is standing on the NPC, and it
## draws over this one.
func _show_the_roster() -> void:
	var away: Vector2 = Net.client.upgrade_npc + Vector2(600.0, 0.0)
	Net.client.predicted_pos = away
	var inst := Net.server.instance_of(Net.LOCAL_PEER)
	if inst != null:
		var p: SimPlayer = inst.world.players.get(Net.LOCAL_PEER)
		if p != null:
			p.pos = away
	_game.set("_upgrades_open", false)
	_game.set("_roster_open", true)
	var roster: Array[Dictionary] = [
		_roster_entry("Whole", 4, 1300, 1300, Color(0.5, 0.9, 1.0)),
		_roster_entry("Bruised", 7, 1600, 940, Color(1.0, 0.8, 0.4)),
		_roster_entry("Nearly", 11, 2000, 160, Color(1.0, 0.5, 0.5)),
	]
	_game.get_node("CharacterSelect").refresh(roster, "c4")


## One roster row in the shape decode_characters produces.
func _roster_entry(who: String, level: int, ceiling: int, current: int,
		tint: Color) -> Dictionary:
	return {
		"id": "c%d" % level,
		"name": who,
		"level": level,
		"xp": 0,
		"progress": 0.4,
		"max_hp": ceiling,
		"hp": current,
		"active": true,
		"colour": tint,
		"inventory": [0, 0, 0, 0] as Array[int],
	}


func _grab(shot_name: String) -> void:
	var path := "%s/shot_%s.png" % [_dir, shot_name]
	var err := get_viewport().get_texture().get_image().save_png(path)
	if err != OK:
		printerr("could not write %s (error %d)" % [path, err])
		return
	print("saved ", path)