/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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.
 */

/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.script.mustache;

import org.opensearch.core.common.bytes.BytesReference;
import org.opensearch.core.xcontent.MediaTypeRegistry;
import org.opensearch.core.xcontent.ToXContent;
import org.opensearch.core.xcontent.XContentBuilder;
import org.opensearch.core.xcontent.XContentParseException;
import org.opensearch.core.xcontent.XContentParser;
import org.opensearch.common.xcontent.XContentType;
import org.opensearch.common.xcontent.json.JsonXContent;
import org.opensearch.script.ScriptType;
import org.opensearch.test.AbstractXContentTestCase;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;

import static org.opensearch.test.hamcrest.OpenSearchAssertions.assertToXContentEquivalent;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.hasEntry;
import static org.hamcrest.Matchers.nullValue;

public class SearchTemplateRequestXContentTests extends AbstractXContentTestCase<SearchTemplateRequest> {

    @Override
    public SearchTemplateRequest createTestInstance() {
        return SearchTemplateRequestTests.createRandomRequest();
    }

    @Override
    protected SearchTemplateRequest doParseInstance(XContentParser parser) throws IOException {
        return SearchTemplateRequest.fromXContent(parser);
    }

    /**
     * Note that when checking equality for xContent parsing, we omit two parts of the request:
     * - The 'simulate' option, since this parameter is not included in the
     *   request's xContent (it's instead used to determine the request endpoint).
     * - The random SearchRequest, since this component only affects the request
     *   parameters and also isn't captured in the request's xContent.
     */
    @Override
    protected void assertEqualInstances(SearchTemplateRequest expectedInstance, SearchTemplateRequest newInstance) {
        assertTrue(
            expectedInstance.isExplain() == newInstance.isExplain()
                && expectedInstance.isProfile() == newInstance.isProfile()
                && expectedInstance.getScriptType() == newInstance.getScriptType()
                && Objects.equals(expectedInstance.getScript(), newInstance.getScript())
                && Objects.equals(expectedInstance.getScriptParams(), newInstance.getScriptParams())
        );
    }

    @Override
    protected boolean supportsUnknownFields() {
        return false;
    }

    public void testToXContentWithInlineTemplate() throws IOException {
        SearchTemplateRequest request = new SearchTemplateRequest();

        request.setScriptType(ScriptType.INLINE);
        request.setScript("{\"query\": { \"match\" : { \"{{my_field}}\" : \"{{my_value}}\" } } }");
        request.setProfile(true);

        Map<String, Object> scriptParams = new HashMap<>();
        scriptParams.put("my_field", "foo");
        scriptParams.put("my_value", "bar");
        request.setScriptParams(scriptParams);

        XContentType contentType = randomFrom(XContentType.values());
        XContentBuilder expectedRequest = MediaTypeRegistry.contentBuilder(contentType)
            .startObject()
            .field("source", "{\"query\": { \"match\" : { \"{{my_field}}\" : \"{{my_value}}\" } } }")
            .startObject("params")
            .field("my_field", "foo")
            .field("my_value", "bar")
            .endObject()
            .field("explain", false)
            .field("profile", true)
            .endObject();

        XContentBuilder actualRequest = MediaTypeRegistry.contentBuilder(contentType);
        request.toXContent(actualRequest, ToXContent.EMPTY_PARAMS);

        assertToXContentEquivalent(BytesReference.bytes(expectedRequest), BytesReference.bytes(actualRequest), contentType);
    }

    public void testToXContentWithStoredTemplate() throws IOException {
        SearchTemplateRequest request = new SearchTemplateRequest();

        request.setScriptType(ScriptType.STORED);
        request.setScript("match_template");
        request.setExplain(true);

        Map<String, Object> params = new HashMap<>();
        params.put("my_field", "foo");
        params.put("my_value", "bar");
        request.setScriptParams(params);

        XContentType contentType = randomFrom(XContentType.values());
        XContentBuilder expectedRequest = MediaTypeRegistry.contentBuilder(contentType)
            .startObject()
            .field("id", "match_template")
            .startObject("params")
            .field("my_field", "foo")
            .field("my_value", "bar")
            .endObject()
            .field("explain", true)
            .field("profile", false)
            .endObject();

        XContentBuilder actualRequest = MediaTypeRegistry.contentBuilder(contentType);
        request.toXContent(actualRequest, ToXContent.EMPTY_PARAMS);

        assertToXContentEquivalent(BytesReference.bytes(expectedRequest), BytesReference.bytes(actualRequest), contentType);
    }

    public void testFromXContentWithEmbeddedTemplate() throws Exception {
        String source = "{"
            + "    'source' : {\n"
            + "    'query': {\n"
            + "      'terms': {\n"
            + "        'status': [\n"
            + "          '{{#status}}',\n"
            + "          '{{.}}',\n"
            + "          '{{/status}}'\n"
            + "        ]\n"
            + "      }\n"
            + "    }\n"
            + "  }"
            + "}";

        SearchTemplateRequest request = SearchTemplateRequest.fromXContent(newParser(source));
        assertThat(request.getScript(), equalTo("{\"query\":{\"terms\":{\"status\":[\"{{#status}}\",\"{{.}}\",\"{{/status}}\"]}}}"));
        assertThat(request.getScriptType(), equalTo(ScriptType.INLINE));
        assertThat(request.getScriptParams(), nullValue());
    }

    public void testFromXContentWithEmbeddedTemplateAndParams() throws Exception {
        String source = "{"
            + "    'source' : {"
            + "      'query': { 'match' : { '{{my_field}}' : '{{my_value}}' } },"
            + "      'size' : '{{my_size}}'"
            + "    },"
            + "    'params' : {"
            + "        'my_field' : 'foo',"
            + "        'my_value' : 'bar',"
            + "        'my_size' : 5"
            + "    }"
            + "}";

        SearchTemplateRequest request = SearchTemplateRequest.fromXContent(newParser(source));
        assertThat(request.getScript(), equalTo("{\"query\":{\"match\":{\"{{my_field}}\":\"{{my_value}}\"}},\"size\":\"{{my_size}}\"}"));
        assertThat(request.getScriptType(), equalTo(ScriptType.INLINE));
        assertThat(request.getScriptParams().size(), equalTo(3));
        assertThat(request.getScriptParams(), hasEntry("my_field", "foo"));
        assertThat(request.getScriptParams(), hasEntry("my_value", "bar"));
        assertThat(request.getScriptParams(), hasEntry("my_size", 5));
    }

    public void testFromXContentWithMalformedRequest() {
        // Unclosed template id
        expectThrows(XContentParseException.class, () -> SearchTemplateRequest.fromXContent(newParser("{'id' : 'another_temp }")));
    }

    /**
     * Creates a {@link XContentParser} with the given String while replacing single quote to double quotes.
     */
    private XContentParser newParser(String s) throws IOException {
        assertNotNull(s);
        return createParser(JsonXContent.jsonXContent, s.replace("'", "\""));
    }
}