/**
 * 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.oozie.servlet;

import java.io.InputStreamReader;
import java.io.StringReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.Callable;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.io.IOUtils;
import org.apache.hadoop.util.Shell;

import org.apache.oozie.BuildInfo;
import org.apache.oozie.client.OozieClient.SYSTEM_MODE;
import org.apache.oozie.client.rest.JsonTags;
import org.apache.oozie.client.rest.RestConstants;
import org.apache.oozie.service.InstrumentationService;
import org.apache.oozie.service.Services;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.JSONValue;
import org.junit.internal.AssumptionViolatedException;

import static org.junit.Assume.assumeTrue;

public class TestV1AdminServlet extends DagServletTestCase {

    static {
        new V1AdminServlet();
        new V1JobServlet();
    }
    private static final boolean IS_SECURITY_ENABLED = false;

    @Override
    protected void setUp()throws Exception {
        super.setUp();
    }

    public void testStatus() throws Exception {
        runTest("/v1/admin/*", V1AdminServlet.class, IS_SECURITY_ENABLED, new Callable<Void>() {
            public Void call() throws Exception {
                URL url = createURL(RestConstants.ADMIN_STATUS_RESOURCE, Collections.EMPTY_MAP);
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setRequestMethod("GET");
                assertEquals(HttpServletResponse.SC_OK, conn.getResponseCode());
                assertTrue(conn.getHeaderField("content-type").startsWith(RestConstants.JSON_CONTENT_TYPE));
                JSONObject json = (JSONObject) JSONValue.parse(new InputStreamReader(conn.getInputStream(),
                        StandardCharsets.UTF_8));
                assertEquals(SYSTEM_MODE.NORMAL.toString(), json.get(JsonTags.OOZIE_SYSTEM_MODE));
                return null;
            }
        });
    }

    public void testOsEnv() throws Exception {
        runTest("/v1/admin/*", V1AdminServlet.class, IS_SECURITY_ENABLED, new Callable<Void>() {
            public Void call() throws Exception {
                URL url = createURL(RestConstants.ADMIN_OS_ENV_RESOURCE, Collections.EMPTY_MAP);
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setRequestMethod("GET");
                assertEquals(HttpServletResponse.SC_OK, conn.getResponseCode());
                assertTrue(conn.getHeaderField("content-type").startsWith(RestConstants.JSON_CONTENT_TYPE));
                JSONObject json = (JSONObject) JSONValue.parse(new InputStreamReader(conn.getInputStream(),
                        StandardCharsets.UTF_8));
                assertTrue("USERNAME, USER or HOME property not found in json",
                        json.containsKey(Shell.WINDOWS ? "USERNAME" : "USER") ||
                                json.containsKey("HOME")
                );
                return null;
            }
        });
    }

    public void testJavaSysProps() throws Exception {
        runTest("/v1/admin/*", V1AdminServlet.class, IS_SECURITY_ENABLED, new Callable<Void>() {
            public Void call() throws Exception {
                URL url = createURL(RestConstants.ADMIN_JAVA_SYS_PROPS_RESOURCE, Collections.EMPTY_MAP);
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setRequestMethod("GET");
                assertEquals(HttpServletResponse.SC_OK, conn.getResponseCode());
                assertTrue(conn.getHeaderField("content-type").startsWith(RestConstants.JSON_CONTENT_TYPE));
                JSONObject json = (JSONObject) JSONValue.parse(new InputStreamReader(conn.getInputStream(),
                        StandardCharsets.UTF_8));
                assertTrue(json.containsKey("java.version"));
                return null;
            }
        });
    }

    public void testConfiguration() throws Exception {
        runTest("/v1/admin/*", V1AdminServlet.class, IS_SECURITY_ENABLED, new Callable<Void>() {
            public Void call() throws Exception {
                URL url = createURL(RestConstants.ADMIN_CONFIG_RESOURCE, Collections.EMPTY_MAP);
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setRequestMethod("GET");
                assertEquals(HttpServletResponse.SC_OK, conn.getResponseCode());
                assertTrue(conn.getHeaderField("content-type").startsWith(RestConstants.JSON_CONTENT_TYPE));
                JSONObject json = (JSONObject) JSONValue.parse(new InputStreamReader(conn.getInputStream(),
                        StandardCharsets.UTF_8));
                assertTrue(json.containsKey(Services.CONF_SERVICE_CLASSES));
                return null;
            }
        });
    }

    public void testInstrumentation() throws Exception {
        try {
            assumeTrue("Instrumentation is disabled by default since 5.0.0", InstrumentationService.isEnabled());
        } catch (final AssumptionViolatedException ex) {
            log.info("Istrumentation is disabled");
            return;
        }

        runTest("/v1/admin/*", V1AdminServlet.class, IS_SECURITY_ENABLED, new Callable<Void>() {
            public Void call() throws Exception {
                URL url = createURL(RestConstants.ADMIN_INSTRUMENTATION_RESOURCE, Collections.EMPTY_MAP);
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setRequestMethod("GET");
                assertEquals(HttpServletResponse.SC_OK, conn.getResponseCode());
                assertTrue(conn.getHeaderField("content-type").startsWith(RestConstants.JSON_CONTENT_TYPE));
                JSONObject json = (JSONObject) JSONValue.parse(new InputStreamReader(conn.getInputStream(),
                        StandardCharsets.UTF_8));
                assertTrue(json.containsKey(JsonTags.INSTR_VARIABLES));
                return null;
            }
        });
    }

    public void testSafeMode() throws Exception {
        runTest(new String[]{"/v1/admin/*", "/v1/job/*"}, new Class[]{V1AdminServlet.class, V1JobServlet.class},
                IS_SECURITY_ENABLED, new Callable<Void>() {
                    public Void call() throws Exception {

                        MockDagEngineService.reset();
                        Map<String, String> params = new HashMap<String, String>();
                        params.put(RestConstants.ACTION_PARAM, RestConstants.JOB_ACTION_START);
                        URL url = createURL("/v1/job/*", MockDagEngineService.JOB_ID + "1"
                                + MockDagEngineService.JOB_ID_END, params);
                        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                        conn.setRequestMethod("PUT");
                        assertEquals(HttpServletResponse.SC_OK, conn.getResponseCode());

                        MockDagEngineService.reset();
                        url = createURL("/v1/admin/*", RestConstants.ADMIN_STATUS_RESOURCE, Collections.EMPTY_MAP);
                        conn = (HttpURLConnection) url.openConnection();
                        conn.setRequestMethod("GET");
                        assertEquals(HttpServletResponse.SC_OK, conn.getResponseCode());
                        assertTrue(conn.getHeaderField("content-type").startsWith(RestConstants.JSON_CONTENT_TYPE));
                        JSONObject json = (JSONObject) JSONValue.parse(new InputStreamReader(conn.getInputStream(),
                                StandardCharsets.UTF_8));
                        assertTrue(json.containsKey(JsonTags.OOZIE_SYSTEM_MODE));
                        assertEquals(SYSTEM_MODE.NORMAL.toString(), json.get(JsonTags.OOZIE_SYSTEM_MODE));

                        MockDagEngineService.reset();
                        params = new HashMap<String, String>();
                        params.put(RestConstants.ADMIN_SYSTEM_MODE_PARAM, SYSTEM_MODE.SAFEMODE.toString());
                        url = createURL("/v1/admin/*", RestConstants.ADMIN_STATUS_RESOURCE, params);
                        conn = (HttpURLConnection) url.openConnection();
                        conn.setRequestMethod("PUT");
                        assertEquals(HttpServletResponse.SC_OK, conn.getResponseCode());

                        MockDagEngineService.reset();
                        url = createURL("/v1/admin/*", RestConstants.ADMIN_STATUS_RESOURCE, Collections.EMPTY_MAP);
                        conn = (HttpURLConnection) url.openConnection();
                        conn.setRequestMethod("GET");
                        assertEquals(HttpServletResponse.SC_OK, conn.getResponseCode());
                        assertTrue(conn.getHeaderField("content-type").startsWith(RestConstants.JSON_CONTENT_TYPE));
                        json = (JSONObject) JSONValue.parse(new InputStreamReader(conn.getInputStream(),
                                StandardCharsets.UTF_8));
                        assertTrue(json.containsKey(JsonTags.OOZIE_SYSTEM_MODE));
                        assertEquals(SYSTEM_MODE.SAFEMODE.toString(), json.get(JsonTags.OOZIE_SYSTEM_MODE));

                        MockDagEngineService.reset();
                        params = new HashMap<String, String>();
                        params.put(RestConstants.ACTION_PARAM, RestConstants.JOB_ACTION_START);
                        url = createURL("/v1/job/*", MockDagEngineService.JOB_ID + "1"
                                + MockDagEngineService.JOB_ID_END, params);
                        conn = (HttpURLConnection) url.openConnection();
                        conn.setRequestMethod("PUT");
                        assertEquals(HttpServletResponse.SC_SERVICE_UNAVAILABLE, conn.getResponseCode());

                        MockDagEngineService.reset();
                        params = new HashMap<String, String>();
                        params.put(RestConstants.ADMIN_SYSTEM_MODE_PARAM, SYSTEM_MODE.NORMAL.toString());
                        url = createURL("/v1/admin/*", RestConstants.ADMIN_STATUS_RESOURCE, params);
                        conn = (HttpURLConnection) url.openConnection();
                        conn.setRequestMethod("PUT");
                        assertEquals(HttpServletResponse.SC_OK, conn.getResponseCode());

                        MockDagEngineService.reset();
                        url = createURL("/v1/admin/*", RestConstants.ADMIN_STATUS_RESOURCE, Collections.EMPTY_MAP);
                        conn = (HttpURLConnection) url.openConnection();
                        conn.setRequestMethod("GET");
                        assertEquals(HttpServletResponse.SC_OK, conn.getResponseCode());
                        assertTrue(conn.getHeaderField("content-type").startsWith(RestConstants.JSON_CONTENT_TYPE));
                        json = (JSONObject) JSONValue.parse(new InputStreamReader(conn.getInputStream(),
                                StandardCharsets.UTF_8));
                        assertTrue(json.containsKey(JsonTags.OOZIE_SYSTEM_MODE));
                        assertEquals(SYSTEM_MODE.NORMAL.toString(), json.get(JsonTags.OOZIE_SYSTEM_MODE));

                        MockDagEngineService.reset();
                        params = new HashMap<String, String>();
                        params.put(RestConstants.ACTION_PARAM, RestConstants.JOB_ACTION_START);
                        url = createURL("/v1/job/*", MockDagEngineService.JOB_ID + "1"
                                + MockDagEngineService.JOB_ID_END, params);
                        conn = (HttpURLConnection) url.openConnection();
                        conn.setRequestMethod("PUT");
                        assertEquals(HttpServletResponse.SC_OK, conn.getResponseCode());

                        return null;
                    }
                });
    }

    public void testVersion() throws Exception {
        runTest("/v1/admin/*", V1AdminServlet.class, IS_SECURITY_ENABLED, new Callable<Void>() {
            public Void call() throws Exception {
                URL url = createURL(RestConstants.ADMIN_BUILD_VERSION_RESOURCE, Collections.EMPTY_MAP);
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setRequestMethod("GET");
                assertEquals(HttpServletResponse.SC_OK, conn.getResponseCode());
                assertTrue(conn.getHeaderField("content-type").startsWith(RestConstants.JSON_CONTENT_TYPE));
                final String response = IOUtils.toString(conn.getInputStream());
                JSONObject json = (JSONObject) JSONValue.parse(new StringReader(response));
                assertEquals(BuildInfo.getBuildInfo().getProperty(BuildInfo.BUILD_VERSION), json.get(JsonTags.BUILD_VERSION));
                JSONObject buildInfo = (JSONObject) json.get(JsonTags.BUILD_INFO);
                for (String buildInfoKey : BuildInfo.getBuildInfo().stringPropertyNames()) {
                    assertEquals("Build value difference in key " + buildInfoKey,
                            BuildInfo.getBuildInfo().getProperty(buildInfoKey), buildInfo.get(buildInfoKey));
                }
                return null;
            }
        });

    }

    public void testV1QueueDump() throws Exception {
        runTest("/v1/admin/*", V1AdminServlet.class, IS_SECURITY_ENABLED, new Callable<Void>() {
            public Void call() throws Exception {
                URL url = createURL(RestConstants.ADMIN_QUEUE_DUMP_RESOURCE, Collections.EMPTY_MAP);
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setRequestMethod("GET");
                assertEquals(HttpServletResponse.SC_OK, conn.getResponseCode());
                assertTrue(conn.getHeaderField("content-type").startsWith(RestConstants.JSON_CONTENT_TYPE));
                JSONObject json = (JSONObject) JSONValue.parse(new InputStreamReader(conn.getInputStream(),
                        StandardCharsets.UTF_8));
                assertTrue(json.containsKey(JsonTags.QUEUE_DUMP));
                return null;
            }
        });

    }

    public void testAvailableTimeZones() throws Exception {
        runTest("/v1/admin/*", V1AdminServlet.class, IS_SECURITY_ENABLED, new Callable<Void>() {
            public Void call() throws Exception {
                URL url = createURL(RestConstants.ADMIN_TIME_ZONES_RESOURCE, Collections.EMPTY_MAP);
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setRequestMethod("GET");
                assertEquals(HttpServletResponse.SC_OK, conn.getResponseCode());
                assertTrue(conn.getHeaderField("content-type").startsWith(RestConstants.JSON_CONTENT_TYPE));
                JSONObject json = (JSONObject) JSONValue.parse(new InputStreamReader(conn.getInputStream(),
                        StandardCharsets.UTF_8));
                assertTrue(json.containsKey(JsonTags.AVAILABLE_TIME_ZONES));
                JSONArray array = (JSONArray) json.get(JsonTags.AVAILABLE_TIME_ZONES);
                assertFalse(array.isEmpty());
                return null;
            }
        });

    }

    public void testPurgeServiceV1() throws Exception {
        runTest("/v1/admin/*", V1AdminServlet.class, IS_SECURITY_ENABLED, new Callable<Void>() {
            @Override
            public Void call() throws Exception {
                URL url = createURL(RestConstants.ADMIN_PURGE, Collections.EMPTY_MAP);
                HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                connection.setRequestMethod("PUT");
                assertEquals(HttpServletResponse.SC_OK, connection.getResponseCode());
                return null;
            }
        });
    }
}