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package com.googlecode.gwt.test.assertions;

import com.googlecode.gwt.test.finder.GwtInstance;

import java.util.Arrays;

import static org.assertj.core.util.Objects.namesOf;

/**
 * Assertions for {@link GwtInstance} wrapped object.
 * 
 * To create a new instance of this class use the method
 * {@link GwtAssertions#assertThat(GwtInstance)}.
 * 
 *
 * @author Gael Lazzari
 */
public class GwtInstanceAssert extends GwtGenericAssert {

    /**
     * Creates a new {@link GwtInstanceAssert}.
     *
     * @param instance the wrapper around the target to verify.
     */
    protected GwtInstanceAssert(GwtInstance instance) {
        super(instance.getRaw(), GwtInstanceAssert.class);
    }

    /**
     * Verifies that the actual {@code Object} is an instance of the given type.
     *
     * @param type the type to check the actual {@code Object} against.
     * @return this assertion object.
     * @throws AssertionError           if the actual {@code Object} is {@code null}.
     * @throws AssertionError           if the actual {@code Object} is not an instance of the given type.
     * @throws IllegalArgumentException if the given type is {@code null}.
     */
    @Override
    public GwtInstanceAssert isInstanceOf(Class type) {
        assertNotNull();
        validateNotNull(type);
        Class current = actual.getClass();
        if (!type.isAssignableFrom(current))
            failWithMessage("expected instance of:<%s> but was instance of:<%s>", type, current);

        return this;
    }

    /**
     * Verifies that the actual {@code Object} is an instance of any of the given types.
     *
     * @param types the types to check the actual {@code Object} against.
     * @return this assertion object.
     * @throws AssertionError           if the actual {@code Object} is {@code null}.
     * @throws AssertionError           if the actual {@code Object} is not an instance of any of the given
     *                                  types.
     * @throws IllegalArgumentException if the given array of types is {@code null}.
     * @throws IllegalArgumentException if the given array of types contains {@code null}s.
     */
    @Override
    public GwtInstanceAssert isInstanceOfAny(Class... types) {
        isNotNull();
        if (types == null)
            throw new IllegalArgumentException("The given array of types should not be null");
        if (!foundInstanceOfAny(types))
            failWithMessage("expected instance of any:<%s> but was instance of:<%s>",
                    typeNames(types), actual.getClass().getName());
        return this;
    }

    private void assertNotNull() {
        if (actual == null) {
            failWithMessage("expecting actual value not to be null");
        }
    }

    private boolean foundInstanceOfAny(Class... types) {
        Class current = actual.getClass();
        for (Class type : types) {
            validateNotNull(type);
            if (type.isAssignableFrom(current))
                return true;
        }
        return false;
    }

    private String typeNames(Class... types) {
        return Arrays.toString(namesOf(types));
    }

    private void validateNotNull(Class type) {
        if (type == null)
            throw new IllegalArgumentException("Expected type cannot be null");
    }

}