package com.vaadin.data;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertSame;

import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;

import com.vaadin.tests.data.bean.Person;

public class BinderTest extends BinderTestBase<Binder<Person>, Person> {

    @Before
    public void setUp() {
        binder = new Binder<>();
        item = new Person();
        item.setFirstName("Johannes");
        item.setAge(32);
    }

    @Test(expected = NullPointerException.class)
    public void bindNullBean_throws() {
        binder.bind(null);
    }

    @Test(expected = NullPointerException.class)
    public void bindNullField_throws() {
        binder.forField(null);
    }

    @Test(expected = NullPointerException.class)
    public void bindNullGetter_throws() {
        binder.bind(nameField, null, Person::setFirstName);
    }

    @Test
    public void fieldBound_bindItem_fieldValueUpdated() {
        binder.forField(nameField).bind(Person::getFirstName,
                Person::setFirstName);
        binder.bind(item);
        assertEquals("Johannes", nameField.getValue());
    }

    @Test
    public void fieldBoundWithShortcut_bindBean_fieldValueUpdated() {
        bindName();
        assertEquals("Johannes", nameField.getValue());
    }

    @Test
    public void beanBound_updateFieldValue_beanValueUpdated() {
        binder.bind(item);
        binder.bind(nameField, Person::getFirstName, Person::setFirstName);

        assertEquals("Johannes", nameField.getValue());
        nameField.setValue("Artur");
        assertEquals("Artur", item.getFirstName());
    }

    @Test
    public void bound_getBean_returnsBoundBean() {
        assertFalse(binder.getBean().isPresent());
        binder.bind(item);
        assertSame(item, binder.getBean().get());
    }

    @Test
    public void unbound_getBean_returnsNothing() {
        binder.bind(item);
        binder.unbind();
        assertFalse(binder.getBean().isPresent());
    }

    @Test
    public void bound_changeFieldValue_beanValueUpdated() {
        bindName();
        nameField.setValue("Henri");
        assertEquals("Henri", item.getFirstName());
    }

    @Test
    public void unbound_changeFieldValue_beanValueNotUpdated() {
        bindName();
        nameField.setValue("Henri");
        binder.unbind();
        nameField.setValue("Aleksi");
        assertEquals("Henri", item.getFirstName());
    }

    @Test
    public void bindNullSetter_valueChangesIgnored() {
        binder.bind(nameField, Person::getFirstName, null);
        binder.bind(item);
        nameField.setValue("Artur");
        assertEquals(item.getFirstName(), "Johannes");
    }

    @Test
    public void bound_bindToAnotherBean_stopsUpdatingOriginal() {
        bindName();
        nameField.setValue("Leif");

        Person p2 = new Person();
        p2.setFirstName("Marlon");
        binder.bind(p2);
        assertEquals("Marlon", nameField.getValue());
        assertEquals("Leif", item.getFirstName());
        assertSame(p2, binder.getBean().get());

        nameField.setValue("Ilia");
        assertEquals("Ilia", p2.getFirstName());
        assertEquals("Leif", item.getFirstName());
    }

    @Test
    public void save_unbound_noChanges() throws ValidationException {
        Binder<Person> binder = new Binder<>();
        Person person = new Person();

        int age = 10;
        person.setAge(age);

        binder.save(person);

        Assert.assertEquals(age, person.getAge());
    }

    @Test
    public void save_bound_beanIsUpdated() throws ValidationException {
        Binder<Person> binder = new Binder<>();
        binder.bind(nameField, Person::getFirstName, Person::setFirstName);

        Person person = new Person();

        String fieldValue = "bar";
        nameField.setValue(fieldValue);

        person.setFirstName("foo");

        binder.save(person);

        Assert.assertEquals(fieldValue, person.getFirstName());
    }

    @Test
    public void load_bound_fieldValueIsUpdated() {
        binder.bind(nameField, Person::getFirstName, Person::setFirstName);

        Person person = new Person();

        String name = "bar";
        person.setFirstName(name);
        binder.load(person);

        Assert.assertEquals(name, nameField.getValue());
    }

    @Test
    public void load_unbound_noChanges() {
        nameField.setValue("");

        Person person = new Person();

        String name = "bar";
        person.setFirstName(name);
        binder.load(person);

        Assert.assertEquals("", nameField.getValue());
    }

    protected void bindName() {
        binder.bind(nameField, Person::getFirstName, Person::setFirstName);
        binder.bind(item);
    }
}