/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you 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 org.apache.causeway.viewer.restfulobjects.applib;

import java.io.IOException;

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

import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.CoreMatchers.not;
import static org.hamcrest.CoreMatchers.nullValue;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.junit.jupiter.api.Assertions.fail;

import static org.apache.causeway.viewer.restfulobjects.applib.JsonFixture.readJson;

class JsonRepresentationTest_getLink_isLink {

    private LinkRepresentation link;
    private JsonRepresentation jsonRepresentation;

    @BeforeEach
    public void setUp() throws Exception {
        link = new LinkRepresentation().withHref("http://foo/bar").withMethod(RestfulHttpMethod.GET);
        jsonRepresentation = new JsonRepresentation(readJson("map.json"));
    }

    @Test
    public void forLink_whenSimpleKey() throws IOException {
        link.withRel("someRel");
        assertThat(jsonRepresentation.isLink("aLink"), is(true));
        assertThat(jsonRepresentation.getLink("aLink"), is(link));
    }

    @Test
    public void forLink_whenMultipartKey() throws IOException {
        link.withRel("someSubRel");
        assertThat(jsonRepresentation.isLink("aSubMap.aLink"), is(true));
        assertThat(jsonRepresentation.getLink("aSubMap.aLink"), is(link));
    }

    @Test
    public void forNonExistent() throws IOException {
        assertThat(jsonRepresentation.isLink("doesNotExist"), is(false));
        assertThat(jsonRepresentation.getLink("doesNotExist"), is(nullValue()));
    }

    @Test
    public void forValue() throws IOException {
        assertThat(jsonRepresentation.isLink("anInt"), is(false));
        try {
            jsonRepresentation.getLink("anInt");
            fail();
        } catch (final IllegalArgumentException e) {
            assertThat(e.getMessage(), is("'anInt' is a value that does not represent a link"));
        }
    }

    @Test
    public void forMap() throws IOException {
        assertThat(jsonRepresentation.isLink("aSubMap"), is(false));
        try {
            jsonRepresentation.getLink("aSubMap");
            fail();
        } catch (final IllegalArgumentException e) {
            assertThat(e.getMessage(), is("'aSubMap' is a map that does not fully represent a link"));
        }
    }

    @Test
    public void forList() throws IOException {
        assertThat(jsonRepresentation.isLink("aSubList"), is(false));
        try {
            jsonRepresentation.getLink("aSubList");
            fail();
        } catch (final IllegalArgumentException e) {
            assertThat(e.getMessage(), is("'aSubList' is an array that does not represent a link"));
        }
    }

    @Test
    public void withPredicate() throws IOException {

        // given
        link = new LinkRepresentation().withRel(Rel.SELF).withHref("http://foo/bar").withMethod(RestfulHttpMethod.GET);
        JsonRepresentation linkListRepr = JsonRepresentation.newArray();
        linkListRepr.arrayAdd(link);

        jsonRepresentation = JsonRepresentation.newMap();
        jsonRepresentation.mapPutJsonRepresentation("links", linkListRepr);

        // when, then
        assertThat(jsonRepresentation.isLink("links[rel=self]"), is(true));
        assertThat(jsonRepresentation.getLink("links[rel=self]"), is(not(nullValue())));

        assertThat(jsonRepresentation.isLink("links[rel=other]"), is(false));
        assertThat(jsonRepresentation.getLink("links[rel=other]"), is(nullValue()));
    }

}
