# Quiz based on a single or multiple choice form.

# The class is set to tool mode to use it in the Course Builder plugin.

tool

class_name QuizChoice

extends Quiz

signal choice_type_changed(is_multiple_choice)

const ERROR_NO_VALID_ANSWERS := "No valid answers set for QuizChoice resource, can't test answers."

export var answer_options := []

export var valid_answers := []

export var is_multiple_choice := true setget set_is_multiple_choice

export var do_shuffle_answers := true

# We use the constructor to reset arrays and avoid a bug where creating a new

# QuizChoice references the answer_options and valid_answers of the previously

# created resource.

func _init() -> void:

answer_options = []

valid_answers = []

is_multiple_choice = true

do_shuffle_answers = true

func test_answer(answers: Array) -> AnswerTestResult:

assert(not valid_answers.empty(), ERROR_NO_VALID_ANSWERS)

var result := AnswerTestResult.new()

result.is_correct = answers.size() == valid_answers.size()

if result.is_correct:

for answer in answers:

if not answer in valid_answers:

result.is_correct = false

break

return result

func set_is_multiple_choice(value: bool) -> void:

is_multiple_choice = value

emit_signal("choice_type_changed", is_multiple_choice)

func get_correct_answer_string() -> String:

var answer_count := valid_answers.size()

var string := ""

if answer_count == 1:

string = valid_answers.back()

else:

# We want a string with the form "a, b, and c"

var index := 0

var separator := ", "

for answer in valid_answers:

string += answer

if index < answer_count - 1:

string += separator

if index == answer_count - 2:

string += " and "

index += 1

return string

func get_answer_count() -> int:

return valid_answers.size()