import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.nio.charset.StandardCharsets;
import java.util.NoSuchElementException;

import static org.junit.jupiter.api.Assertions.*;


class PasswordManagerTest {

    static PasswordManager pm;

    @BeforeAll
    static void init() {
        pm = new PasswordManager();
    }

    @BeforeEach
    void reset() {
        pm.outputStream = System.out;
        pm.inputStream = System.in;
    }

    @Test
    void constructor() {
        assertInstanceOf(PasswordManager.class, pm);
    }

    @Test
    void listVaults() {
        pm.listVaults();
    }

    @Test
    void openVault() {
        pm.openVault();
    }

    @Test
    void menuNavigationListVaults() {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        pm.inputStream = new ByteArrayInputStream("l\n".getBytes(StandardCharsets.UTF_8));
        pm.outputStream = outputStream;
        pm.showMenu();
        assertTrue(outputStream.toString().endsWith("Vaults:\n"));
    }

    @Test
    void menuNavigationOpenVault() {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        pm.inputStream = new ByteArrayInputStream("v 0\n".getBytes(StandardCharsets.UTF_8));
        pm.outputStream = outputStream;
        pm.showMenu();
        assertTrue(outputStream.toString().endsWith("-- vaults not implemented yet\n"));
    }

    @Test
    void showMenu() {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        pm.inputStream = getEmptyStringInputStream();
        pm.outputStream = outputStream;
        assertThrowsExactly(NoSuchElementException.class, () -> pm.showMenu());
        assertTrue(outputStream.toString().startsWith("\nciip Gruppe 8"));
    }

    @Test
    void exitMenu() {
        pm.inputStream = new ByteArrayInputStream("e\n".getBytes(StandardCharsets.UTF_8));
        pm.showMenu();
        assertFalse(pm.running);
    }

    @Test
    void doNotExitMenuAfterWrongInput() {
        pm.inputStream = new ByteArrayInputStream("__\n".getBytes(StandardCharsets.UTF_8));
        pm.showMenu();
        assertTrue(pm.running);

        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        pm.inputStream = getEmptyStringInputStream();
        pm.outputStream = outputStream;

        assertThrowsExactly(NoSuchElementException.class, () -> pm.showMenu());
        assertTrue(outputStream.toString().startsWith("\nciip Gruppe 8"));
    }

    private ByteArrayInputStream getEmptyStringInputStream() {
        return new ByteArrayInputStream("".getBytes(StandardCharsets.UTF_8));
    }
}