/*
 * 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.logging.log4j.layout.template.json;

import static org.apache.logging.log4j.layout.template.json.TestHelpers.serializeUsingLayout;

import java.math.BigDecimal;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.config.Configuration;
import org.apache.logging.log4j.core.config.DefaultConfiguration;
import org.apache.logging.log4j.core.layout.GelfLayout;
import org.apache.logging.log4j.core.time.Instant;
import org.apache.logging.log4j.layout.template.json.JsonTemplateLayout.EventTemplateAdditionalField;
import org.assertj.core.api.Assertions;
import org.junit.jupiter.api.Test;

class GelfLayoutTest {

    private static final Configuration CONFIGURATION = new DefaultConfiguration();

    private static final String HOST_NAME = "localhost";

    private static final JsonTemplateLayout JSON_TEMPLATE_LAYOUT = JsonTemplateLayout.newBuilder()
            .setConfiguration(CONFIGURATION)
            .setEventTemplateUri("classpath:GelfLayout.json")
            .setEventTemplateAdditionalFields(new EventTemplateAdditionalField[] {
                EventTemplateAdditionalField.newBuilder()
                        .setKey("host")
                        .setValue(HOST_NAME)
                        .build()
            })
            .build();

    private static final GelfLayout GELF_LAYOUT = GelfLayout.newBuilder()
            .setConfiguration(CONFIGURATION)
            .setHost(HOST_NAME)
            .setCompressionType(GelfLayout.CompressionType.OFF)
            .build();

    @Test
    void test_lite_log_events() {
        final List<LogEvent> logEvents = LogEventFixture.createLiteLogEvents(1_000);
        test(logEvents);
    }

    @Test
    void test_full_log_events() {
        final List<LogEvent> logEvents = LogEventFixture.createFullLogEvents(1_000);
        test(logEvents);
    }

    private static void test(final Collection<LogEvent> logEvents) {
        for (final LogEvent logEvent : logEvents) {
            test(logEvent);
        }
    }

    private static void test(final LogEvent logEvent) {
        final Map<String, Object> jsonTemplateLayoutMap = renderUsingJsonTemplateLayout(logEvent);
        final Map<String, Object> gelfLayoutMap = renderUsingGelfLayout(logEvent);
        verifyTimestamp(logEvent.getInstant(), jsonTemplateLayoutMap, gelfLayoutMap);
        Assertions.assertThat(jsonTemplateLayoutMap).isEqualTo(gelfLayoutMap);
    }

    private static Map<String, Object> renderUsingJsonTemplateLayout(final LogEvent logEvent) {
        return serializeUsingLayout(logEvent, JSON_TEMPLATE_LAYOUT);
    }

    private static Map<String, Object> renderUsingGelfLayout(final LogEvent logEvent) {
        return serializeUsingLayout(logEvent, GELF_LAYOUT);
    }

    /**
     * Handle timestamps individually to avoid floating-point comparison hiccups.
     */
    private static void verifyTimestamp(
            final Instant logEventInstant,
            final Map<String, Object> jsonTemplateLayoutMap,
            final Map<String, Object> gelfLayoutMap) {
        final BigDecimal jsonTemplateLayoutTimestamp = (BigDecimal) jsonTemplateLayoutMap.remove("timestamp");
        final BigDecimal gelfLayoutTimestamp = (BigDecimal) gelfLayoutMap.remove("timestamp");
        final String description = String.format(
                "instantEpochSecs=%d.%d, jsonTemplateLayoutTimestamp=%s, gelfLayoutTimestamp=%s",
                logEventInstant.getEpochSecond(),
                logEventInstant.getNanoOfSecond(),
                jsonTemplateLayoutTimestamp,
                gelfLayoutTimestamp);
        Assertions.assertThat(jsonTemplateLayoutTimestamp.compareTo(gelfLayoutTimestamp))
                .as(description)
                .isEqualTo(0);
    }
}
