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/**
 * 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 io.fabric8.kubernetes.assertions;

import io.fabric8.kubernetes.api.model.Pod;
import io.fabric8.kubernetes.api.model.PodList;
import io.fabric8.kubernetes.api.model.LabelSelectorRequirement;
import io.fabric8.kubernetes.assertions.support.PodWatcher;
import io.fabric8.kubernetes.client.KubernetesClient;
import io.fabric8.kubernetes.client.Watch;
import io.fabric8.utils.Strings;
import io.fabric8.utils.Systems;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.List;
import java.util.Map;

import static java.lang.Long.getLong;
import static org.assertj.core.api.Java6Assertions.assertThat;

/**
 * Assertion helper for performing assertions on a selection of pods
 */
public class PodSelectionAssert {
    public static final String PROPERTY_ASSERT_NOT_READY_TIMEOUT_MILLIS = "fabric8.assert.notReadyTimeoutMills";
    public static final String PROPERTY_ASSERT_READY_PERIOD_MILLIS = "fabric8.assert.readyPeriodMills";

    public static final long DEFAULT_NOT_READY_TIMEOUT_MS = 5 * 60 * 1000;
    public static final long DEFAULT_READY_PERIOD_MS = 10 * 1000;

    private static final transient Logger LOG = LoggerFactory.getLogger(PodSelectionAssert.class);

    private final KubernetesClient client;
    private final Integer replicas;
    private final Map matchLabels;
    private final List matchExpressions;
    private final String description;


    public static long getDefaultReadyPeriodMs() {
        return parseLongValue(Systems.getEnvVarOrSystemProperty(PROPERTY_ASSERT_READY_PERIOD_MILLIS), DEFAULT_READY_PERIOD_MS);
    }

    public static long getDefaultNotReadyTimeoutMs() {
        return parseLongValue(Systems.getEnvVarOrSystemProperty(PROPERTY_ASSERT_NOT_READY_TIMEOUT_MILLIS), DEFAULT_NOT_READY_TIMEOUT_MS);
    }

    private static long parseLongValue(String text, long defaultValue) {
        if (Strings.isNotBlank(text)) {
            try {
                return Long.parseLong(text);
            } catch (NumberFormatException e) {
                LOG.warn("Could not parse long value " + text + ": " + e, e);
            }
        }
        return defaultValue;
    }

    public PodSelectionAssert(KubernetesClient client, Integer replicas, Map matchLabels, List matchExpressions, String description) {
        this.client = client;
        this.replicas = replicas;
        this.matchLabels = matchLabels;
        this.matchExpressions = matchExpressions;
        this.description = description;
    }

    public KubernetesClient getClient() {
        return client;
    }

    public String getDescription() {
        return description;
    }

    public Integer getReplicas() {
        return replicas;
    }

    public Map getMatchLabels() {
        return matchLabels;
    }

    public List getMatchExpressions() {
        return matchExpressions;
    }

    /**
     * Asserts that a pod is ready for this deployment all become ready within the given time and that each one keeps being ready for the given time
     */
    public PodSelectionAssert isPodReadyForPeriod() {
        return isPodReadyForPeriod(getDefaultNotReadyTimeoutMs(), getDefaultReadyPeriodMs());
    }

    /**
     * Asserts that a pod is ready for this deployment all become ready within the given time and that each one keeps being ready for the given time
     */
    public PodSelectionAssert isPodReadyForPeriod(long notReadyTimeoutMS, long readyPeriodMS) {
        if (replicas.intValue() <= 0) {
            LOG.warn("Not that the pod selection for: " + description + " has no replicas defined so we cannot assert there is a pod ready");
            return this;
        }

        try (PodWatcher podWatcher = new PodWatcher(this, notReadyTimeoutMS, readyPeriodMS);
             Watch watch = client.pods().withLabels(matchLabels).watch(podWatcher);
        ) {
            podWatcher.loadCurrentPods();
            podWatcher.waitForPodReady();

        }
        return this;
    }

    /**
     * Loads the current pods for this selection
     *
     * @return the current pods
     */
    public List getPods() {
        PodList list = getClient().pods().withLabels(getMatchLabels()).list();
        assertThat(list).describedAs(getDescription() + " pods").isNotNull();
        return list.getItems();
    }
}