feat: add selectable levels and previews

Added two more level names and their descriptions to test out if the
game would handle multiple levels correctly. Also changed levels.json
into a dict where the keys are level names and the value is another dict
with its properties.

Author: danielzting

LevelSelect.gd

@@ -1,12 +1,21 @@
 extends HBoxContainer
 
+var levels
+
 func _ready():
-	var file = File.new()
-	file.open("res://levels.json", file.READ)
-	var levels = parse_json(file.get_as_text())
+	var descriptions = File.new()
+	descriptions.open("res://levels.json", descriptions.READ)
+	levels = parse_json(descriptions.get_as_text())
+	var first = true
 	for level in levels:
 		var button = Button.new()
-		button.text = level.name
+		button.text = level
 		button.align = Button.ALIGN_LEFT
+		button.connect("focus_entered", self, "_on_Button_focus_changed")
 		$LevelsBorder/Levels.add_child(button)
-		$PreviewBorder/Preview/Info.text = level.documentation
+		if first:
+			button.grab_focus()
+			first = false
+
+func _on_Button_focus_changed():
+	$PreviewBorder/Preview/Info.text = levels[get_focus_owner().text]["about"]

MainMenu.gd

@@ -1,4 +1,7 @@
 extends VBoxContainer
 
+func _ready():
+	$StartButton.grab_focus()
+
 func _on_StartButton_pressed():
 	get_tree().change_scene("res://LevelSelect.tscn")

levels.json

@@ -1,6 +1,14 @@
-[
+{
+	"BUBBLE SORT":
 	{
-		"name": "BUBBLE SORT",
-		"documentation": "Bubble sort is a simple sorting algorithm typically taught in introductory computer science classes. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nulla et iaculis neque. Vivamus pellentesque dictum rutrum."
+		"about": "Bubble sort is a simple sorting algorithm, typically the first taught in introductory computer science classes."
+	},
+	"SELECTION SORT":
+	{
+		"about": "Why would you use selection sort when there's bubble sort and insertion sort..."
+	},
+	"INSERTION SORT":
+	{
+		"about": "Lorem ipsum sit dolor amet"
 	}
-]
+}

project.godot

@@ -16,7 +16,7 @@ _global_script_class_icons={
 [application]
 
 config/name="Human Computer Simulator"
-run/main_scene="res://MainMenu.tscn"
+run/main_scene="res://LevelSelect.tscn"
 run/low_processor_mode=true
 boot_splash/image="res://splash.png"