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/**
 * Copyright 2012 Lyncode
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.lyncode.xml.matchers;

import com.lyncode.test.matchers.extractor.ExtractFunction;
import com.lyncode.test.matchers.extractor.MatcherExtractor;
import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.hamcrest.TypeSafeMatcher;

import javax.xml.namespace.QName;
import javax.xml.stream.events.XMLEvent;

import static org.hamcrest.core.AnyOf.anyOf;

public class XmlEventMatchers {
    public static Matcher text () {
        return new TypeSafeMatcher() {
            @Override
            protected boolean matchesSafely(XMLEvent item) {
                return item.isCharacters();
            }

            @Override
            public void describeTo(Description description) {
                description.appendText("is text");
            }
        };
    }

    public static Matcher aStartElement () {
        return new TypeSafeMatcher() {
            @Override
            protected boolean matchesSafely(XMLEvent item) {
                return item.isStartElement();
            }

            @Override
            public void describeTo(Description description) {
                description.appendText("is start element");
            }
        };
    }

    public static Matcher anEndElement () {
        return new TypeSafeMatcher() {
            @Override
            protected boolean matchesSafely(XMLEvent item) {
                return item.isEndElement();
            }

            @Override
            public void describeTo(Description description) {
                description.appendText("is end element");
            }
        };
    }

    public static Matcher theEndOfDocument () {
        return new TypeSafeMatcher() {
            @Override
            protected boolean matchesSafely(XMLEvent item) {
                return item.isEndDocument();
            }

            @Override
            public void describeTo(Description description) {
                description.appendText("is the end of the document");
            }
        };
    }

    public static Matcher theStartOfDocument () {
        return new TypeSafeMatcher() {
            @Override
            protected boolean matchesSafely(XMLEvent item) {
                return item.isStartDocument();
            }

            @Override
            public void describeTo(Description description) {
                description.appendText("is the start of the document");
            }
        };
    }

    public static Matcher anElement () {
        return anyOf(aStartElement(), anEndElement());
    }

    public static Matcher anElementOr (Matcher matcher) {
        return anyOf(aStartElement(), anEndElement(), matcher);
    }

    public static Matcher hasAttributes () {
        return new TypeSafeMatcher() {
            @Override
            protected boolean matchesSafely(XMLEvent item) {
                return aStartElement().matches(item) && item.asStartElement().getAttributes().hasNext();
            }

            @Override
            public void describeTo(Description description) {
                description.appendText("has attributes");
            }
        };
    }

    public static Matcher elementName (Matcher nameMatcher) {
        return new MatcherExtractor(nameMatcher, extractName());
    }

    private static ExtractFunction extractName() {
        return new ExtractFunction() {
            @Override
            public QName apply(XMLEvent input) {
                if (input.isStartElement()) return input.asStartElement().getName();
                else if (input.isEndElement()) return input.asEndElement().getName();
                else return null;
            }

            @Override
            public void describeTo(Description description) {
                description.appendText("name");
            }
        };
    }
}