diff --git a/Semesterprojekt/src/main/java/thb/jeanluc/adventure/io/GameIO.java b/Semesterprojekt/src/main/java/thb/jeanluc/adventure/io/GameIO.java index 98584b0..9ca91b1 100644 --- a/Semesterprojekt/src/main/java/thb/jeanluc/adventure/io/GameIO.java +++ b/Semesterprojekt/src/main/java/thb/jeanluc/adventure/io/GameIO.java @@ -9,6 +9,8 @@ import thb.jeanluc.adventure.io.text.Renderings; import thb.jeanluc.adventure.io.text.RoomView; import thb.jeanluc.adventure.io.text.StyledText; +import java.util.List; + /** * Bidirectional channel between the engine and the player. Commands emit * semantic, role-styled output via {@link #print(StyledText)} (the primitive) @@ -56,4 +58,38 @@ public interface GameIO { default void showQuests(QuestView view) { print(QuestText.render(view)); } + + /** + * Presents a titled list of options and returns the 0-based index of the + * player's choice. Default (console) prints a numbered list and reads a + * number, re-prompting on invalid input. EOF / empty input returns the + * LAST option (menus place the safe/cancel option last). Frontends with + * native widgets (e.g. buttons) may override. + * + * @param title heading shown above the options + * @param options non-empty list of option labels + * @return 0-based index into {@code options} + */ + default int choose(String title, List options) { + StyledText.Builder b = StyledText.builder().heading(title).plain("\n"); + for (int i = 0; i < options.size(); i++) { + b.plain(" " + (i + 1) + ") " + options.get(i) + "\n"); + } + print(b.build()); + while (true) { + String line = readLine(); + if (line == null || line.isBlank()) { + return options.size() - 1; + } + try { + int n = Integer.parseInt(line.trim()); + if (n >= 1 && n <= options.size()) { + return n - 1; + } + } catch (NumberFormatException ignored) { + // fall through to re-prompt + } + write("Please enter a number between 1 and " + options.size() + "."); + } + } } diff --git a/Semesterprojekt/src/test/java/thb/jeanluc/adventure/io/ChooseDefaultTest.java b/Semesterprojekt/src/test/java/thb/jeanluc/adventure/io/ChooseDefaultTest.java new file mode 100644 index 0000000..d42ee6f --- /dev/null +++ b/Semesterprojekt/src/test/java/thb/jeanluc/adventure/io/ChooseDefaultTest.java @@ -0,0 +1,32 @@ +package thb.jeanluc.adventure.io; + +import org.junit.jupiter.api.Test; + +import java.util.List; + +import static org.assertj.core.api.Assertions.assertThat; + +class ChooseDefaultTest { + + @Test + void returnsZeroBasedIndexOfValidChoice() { + TestIO io = new TestIO().enqueue("2"); + int i = io.choose("Menu", List.of("A", "B", "C")); + assertThat(i).isEqualTo(1); + } + + @Test + void rePromptsOnInvalidThenAccepts() { + TestIO io = new TestIO().enqueue("9").enqueue("x").enqueue("1"); + int i = io.choose("Menu", List.of("A", "B")); + assertThat(i).isZero(); + assertThat(io.allOutput()).contains("between 1 and 2"); + } + + @Test + void eofReturnsLastOption() { + TestIO io = new TestIO(); // empty queue → readLine() returns null + int i = io.choose("Menu", List.of("Play", "Quit")); + assertThat(i).isEqualTo(1); + } +}