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")
const GAME_SCENE := preload("res://src/view/game_scene.gd")
## Its own store and its own account, like every diagnostic. Without these the
## tool hosted a listen server on the player's REAL character store as the
## player's REAL account, and walked their character into dungeons to take
## pictures -- with health carried between runs, a stray hit would have stuck,
## and a death would have retired someone's character for a screenshot.
const STORE := "user://screenshot_characters.json"
const ACCOUNT := 777001
## 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 := 200
const ENTER_GAME := 204
const AT_GAME := 370
const OPEN_MENU := 380
const AT_INGAME_MENU := 410
const OPEN_SETTINGS := 420
const AT_SETTINGS := 450
const OPEN_CREDITS := 460
const AT_CREDITS := 490
const OPEN_UPGRADES := 500
const AT_UPGRADES := 530
const OPEN_ROSTER := 540
const AT_ROSTER := 570
const ENTER_DUNGEON := 580
const AT_DUNGEON := 650
const TO_TUNNEL := 660
const AT_TUNNEL := 720
const AT_TUNNEL_DEBUG := 730
const TO_BOSS := 740
const AT_BOSS := 810
const ESCAPE_START := 830
## A safety net only: the run normally ends the moment the escape shot is taken.
const DONE := 1710

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


func _ready() -> void:
	GameOpts.parse()
	GameOpts.store_path = STORE
	GameOpts.account_override = ACCOUNT
	DirAccess.remove_absolute(ProjectSettings.globalize_path(STORE))
	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
		# Made rather than assumed. The example in CLAUDE.md points at a fresh
		# /tmp/shots, and a missing directory fails every capture one at a time
		# with an error that names the file rather than the folder.
		DirAccess.make_dir_recursive_absolute(_dir)
	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()
	# On an entrance for the hub shot, so its prompt is in the picture.
	if _frame > AT_GAME - 40 and _frame <= AT_GAME:
		_stand_on_a_portal()
	# 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()
	# Held, because the boss is firing and one landed ring would end the shot.
	# High until just before the picture and low after, so the damage trail
	# -- the part of the bar the drop took -- is still draining when it is taken.
	if _frame > TO_BOSS and not _left_shot:
		# Forty frames, not ten: at a high frame rate ten is shorter than one
		# snapshot, and the picture showed the health from before the drop.
		_hold_health(0.62 if _frame < AT_BOSS - 40 else 0.22)
	# Captured by progress rather than by frame count. The channel is one second
	# of server ticks and frames run as fast as the display allows, so a fixed
	# frame number lands anywhere from a quarter of the way in to after it has
	# completed -- and a completed escape teleports the player out mid-sequence.
	if _frame >= ESCAPE_START and not _left_shot:
		Net.client.request_escape = true
		if Net.client.my_escape >= 0.45:
			_grab("leaving")
			Net.client.request_escape = false
			_left_shot = true
			Net.shutdown()
			get_tree().quit(0)
			return
	if _frame == AT_BOSS - 30:
		Net.server._grant_xp(Net.LOCAL_PEER, 46)
	# Frames, not seconds, and this runs as fast as the display allows -- so
	# early enough that the banner's fade-in is over even at a high frame rate.
	if _frame == AT_BOSS - 60:
		_game.get_node("HUD").banner("LEVEL 7", "a choice waits at the quartermaster")
	match _frame:
		AT_MENU:
			_grab("menu")
		ENTER_GAME:
			_menu.queue_free()
			Net.host(27455)
			_seed_character()
			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")
		ENTER_DUNGEON:
			# The fog is what these two are for, and the hub is the worst place to
			# judge it: one big room with little in it to cast a shadow.
			_game.set("_roster_open", false)
			_game.get_node("CharacterSelect").set_fallen("")
			Net.server._send_to_dungeon(Net.LOCAL_PEER)
		AT_DUNGEON:
			_grab("dungeon")
		TO_TUNNEL:
			_stand_in_a_tunnel()
		AT_TUNNEL:
			_grab("tunnel")
			# The same view with F1's overlay: the outline is where each fog ray
			# stopped, which is the quickest way to tell a rendering mistake from
			# a geometry one.
			_game.get_node("WorldView").debug_hitboxes = true
		AT_TUNNEL_DEBUG:
			_grab("tunnel_debug")
		TO_BOSS:
			_game.get_node("WorldView").debug_hitboxes = false
			_stage_a_boss_fight()
		AT_BOSS:
			_grab("boss_fight")
		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)
	# A death, as it is announced on the screen a death sends you to.
	_game.get_node("CharacterSelect").set_fallen(GAME_SCENE.fallen_line(
		{"name": "Quillfell", "level": 9, "where": "The Choir Vault"}))
	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")


## A character worth photographing: levelled, carrying things, so the HUD has
## something in every slot and a bar that is not empty. Made in the scratch
## store before the local client says hello, so it is who the client resumes.
func _seed_character() -> void:
	var store := Net.server.store
	var c := store.create_character(ACCOUNT, "Ash")
	store.grant_xp(ACCOUNT, c.id, Progression.total_xp_for_level(6) + 260)
	var bag: Array[StringName] = [Items.HEALTH_POTION, Items.WARDENS_RATION,
		Items.HEALTH_POTION, Items.NONE]
	store.set_inventory(ACCOUNT, c.id, bag)
	store.flush()


func _stand_on_a_portal() -> void:
	if Net.client == null or Net.client.portals.is_empty():
		return
	var at: Vector2 = Net.client.portals[0]["pos"]
	Net.client.predicted_pos = at
	var p := _player()
	if p != null:
		p.pos = at


func _player() -> SimPlayer:
	var inst := Net.server.instance_of(Net.LOCAL_PEER)
	return inst.world.players.get(Net.LOCAL_PEER) if inst != null else null


func _hold_health(share: float) -> void:
	var p := _player()
	if p != null:
		p.hp = maxi(1, int(float(p.max_hp) * share))


## Into the boss arena, low on health, with a party member beside you and a
## few messages in the feed: everything on the HUD that only exists mid-fight,
## in one picture.
##
## The party member is a world player with no socket behind it -- added to the
## simulation and the roster, never to the instance's send list, so the server
## never tries to talk to it.
func _stage_a_boss_fight() -> void:
	var inst := Net.server.instance_of(Net.LOCAL_PEER)
	if inst == null:
		return
	var at := inst.boss_spawn + Vector2(-200.0, 60.0)
	Net.client.predicted_pos = at
	var me := _player()
	if me != null:
		me.pos = at
		me.spawn_grace = 0
	var friend := inst.world.add_player(999, "Wren")
	friend.pos = at + Vector2(-40.0, -70.0)
	friend.colour = Color(1.0, 0.75, 0.45)
	friend.hp = int(float(friend.max_hp) * 0.6)
	friend.spawn_grace = 0
	Net.server.peer_names[999] = "Wren"
	Net.server.peer_instance[999] = inst.id
	# And one out of sight, so the marker pointing the way to them shows.
	var away := inst.world.add_player(998, "Lark")
	away.pos = at + Vector2(-560.0, 260.0)
	away.colour = Color(0.55, 0.85, 1.0)
	away.spawn_grace = 0
	Net.server.peer_names[998] = "Lark"
	Net.server.peer_instance[998] = inst.id
	Net.server._broadcast_roster()
	var hud := _game.get_node("HUD")
	hud.notify("+ Health Potion", Items.get_def(Items.HEALTH_POTION).tint)
	hud.notify("Warden's Ration used", Items.get_def(Items.WARDENS_RATION).tint)


## Move the player, on both sides, into the tunnel closest to where it spawned:
## somewhere with walls close on two sides and a corner in view, which is where
## the old fog looked worst.
func _stand_in_a_tunnel() -> void:
	var inst := Net.server.instance_of(Net.LOCAL_PEER)
	if inst == null or inst.rooms.is_empty():
		return
	var map := inst.world.map
	var start: Rect2i = inst.rooms[0]
	var spawn := map.to_tile(inst.world.spawn_point)
	var best := Vector2i(-1, -1)
	var best_d := INF
	for ty in map.height:
		for tx in map.width:
			if map.at(tx, ty) != MapGrid.Kind.FLOOR:
				continue
			var here := Vector2i(tx, ty)
			var in_room := inst.boss_room.has_point(here)
			for r: Rect2i in inst.rooms:
				if r.grow(1).has_point(here):
					in_room = true
			if in_room:
				continue
			# A couple of tiles clear of the first room, so the tunnel's walls
			# are on screen and not just the doorway.
			if start.grow(3).has_point(here):
				continue
			var d := float((here - spawn).length_squared())
			if d < best_d:
				best_d = d
				best = here
	if best.x < 0:
		return
	var at := map.tile_centre(best.x, best.y)
	Net.client.predicted_pos = at
	var p: SimPlayer = inst.world.players.get(Net.LOCAL_PEER)
	if p != null:
		p.pos = at


## 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)