Win and Lose Screen

extends Node2D

# "$GameOverPanel" is the node named GameOverPanel, sitting under this one.
@onready var game_over_panel: GameOverPanel = $GameOverPanel

## Once the game is over, ignore any more zone touches.
var is_game_over: bool = false

func _ready() -> void:
	%WinZone.body_entered.connect(_on_win_zone_entered)
	%LoseZone.body_entered.connect(_on_lose_zone_entered)

func _on_win_zone_entered(body: Node2D) -> void:
	# Two reasons to quit early: the game already ended, or the thing that
	# touched the zone was not the player. "not (...)" flips true and false.
	if is_game_over or not (body is WinLosePlayer):
		return
	# Set the flag FIRST, so a second touch cannot get past the line above.
	is_game_over = true
	# GameOverPanel is our child, so we skip signals and call its function.
	game_over_panel.show_win()

func _on_lose_zone_entered(body: Node2D) -> void:
	if is_game_over or not (body is WinLosePlayer):
		return
	is_game_over = true
	game_over_panel.show_lose()

class_name GameOverPanel
extends CanvasLayer

@onready var message_label: Label = %MessageLabel

func _ready() -> void:
	# Start hidden. The level shows it only when the game ends.
	%Overlay.hide()
	%PlayAgainButton.pressed.connect(_on_play_again_pressed)
	%HomeButton.pressed.connect(_on_home_pressed)

## Called BY win_and_lose_screen.gd when the player reaches the green zone.
func show_win() -> void:
	_end_game("You Win!", Color(0.4, 1.0, 0.5))

## Called BY win_and_lose_screen.gd when the player reaches the red zone.
func show_lose() -> void:
	_end_game("You Lose!", Color(1.0, 0.4, 0.4))

# Both show_win() and show_lose() do the same three things, so the shared
# work lives here and they each just pass in their own words and colour.
func _end_game(message: String, color: Color) -> void:
	message_label.text = message
	# "modulate" tints the label. Color(red, green, blue), 0.0 to 1.0 each.
	message_label.modulate = color
	%Overlay.show()
	# Freeze the whole game behind the panel.
	get_tree().paused = true
	# "grab_focus()" puts the keyboard on this button, so pressing Enter
	# works without touching the mouse.
	%PlayAgainButton.grab_focus()

func _on_play_again_pressed() -> void:
	# ALWAYS unpause before leaving, or the next scene opens frozen solid.
	get_tree().paused = false
	# "reload_current_scene()" builds this level again from scratch.
	get_tree().reload_current_scene()

func _on_home_pressed() -> void:
	get_tree().paused = false
	get_tree().change_scene_to_file("res://shared/ui/lesson_select.tscn")

class_name WinLosePlayer
extends CharacterBody2D

## How fast the player moves. "@export" puts "speed" at the top of the
## Inspector panel, so you can change it there instead of in this file.
@export var speed: float = 200.0

# "_physics_process()" runs about 60 times a second. Godot calls it for you.
func _physics_process(_delta: float) -> void:
	# "Input.get_vector(...)" checks all four keys at once and hands back
	# an arrow pointing where to go. The four names in quotes are ours.
	# See them under Project > Project Settings > Input Map.
	var direction: Vector2 = Input.get_vector(
		"move_left", "move_right", "move_up", "move_down"
	)
	# "direction" is only WHICH WAY (its length is always 1).
	# "direction * speed" stretches it, so "velocity" is also HOW FAST.
	velocity = direction * speed
	# Nothing moves until "move_and_slide()" runs.
	# "Slide" means we slide along walls instead of sticking to them.
	move_and_slide()

	# The warrior picture only faces right. Walking left mirrors it.
	if direction.x != 0.0:
		$Sprite2D.flip_h = direction.x < 0.0