/**
 * 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;

import org.apache.hadoop.conf.Configuration;
import org.apache.oozie.client.WorkflowJob;
import org.apache.oozie.client.OozieClient;
import org.apache.oozie.service.ActionService;
import org.apache.oozie.service.SchemaService;
import org.apache.oozie.service.WorkflowStoreService;
import org.apache.oozie.service.Services;
import org.apache.oozie.test.EmbeddedServletContainer;
import org.apache.oozie.test.XTestCase;
import org.apache.oozie.util.IOUtils;
import org.apache.oozie.util.XConfiguration;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.io.StringReader;
import java.io.OutputStream;
import java.io.FileOutputStream;
import java.nio.charset.StandardCharsets;

public class TestDagEngine extends XTestCase {
    private EmbeddedServletContainer container;
    private Services services;

    public static class CallbackServlet extends HttpServlet {
        public static volatile String JOB_ID = null;
        public static String NODE_NAME = null;
        public static String STATUS = null;

        public static void reset() {
            JOB_ID = null;
            NODE_NAME = null;
            STATUS = null;
        }

        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            JOB_ID = req.getParameter("jobId");
            NODE_NAME = req.getParameter("nodeName");
            STATUS = req.getParameter("status");
            resp.setStatus(HttpServletResponse.SC_OK);
        }

    }
    protected void setUp() throws Exception {
        super.setUp();
        CallbackServlet.reset();
        container = new EmbeddedServletContainer("oozie");
        container.addServletEndpoint("/callback", CallbackServlet.class);
        container.start();

        setSystemProperty(SchemaService.WF_CONF_EXT_SCHEMAS, "wf-ext-schema.xsd");
        services = new Services();
        services.init();
        services.get(ActionService.class).registerAndInitExecutor(ForTestingActionExecutor.class);
    }

    protected void tearDown() throws Exception {
        services.destroy();
        container.stop();
        super.tearDown();
    }

    public void testSubmit() throws Exception {
        String workflowPath = getTestCaseFileUri("workflow.xml");
        Reader reader = IOUtils.getResourceAsReader("wf-ext-schema-valid.xml", -1);
        Writer writer = new OutputStreamWriter(new FileOutputStream(new File(getTestCaseDir(), "workflow.xml")),
                StandardCharsets.UTF_8);
        IOUtils.copyCharStream(reader, writer);

        OutputStream os = new FileOutputStream(new File(getTestCaseDir(), "config-default.xml"));
        XConfiguration defaultConf = new XConfiguration();
        defaultConf.set("a", "AA");
        defaultConf.set("b", "BB");
        defaultConf.set("e", "${d}${d}");
        defaultConf.writeXml(os);
        os.close();

        final DagEngine engine = new DagEngine(getTestUser());
        Configuration conf = new XConfiguration();
        conf.set(OozieClient.APP_PATH, workflowPath);
        conf.set(OozieClient.USER_NAME, getTestUser());

        conf.set(OozieClient.LOG_TOKEN, "t");
        conf.set(OozieClient.ACTION_NOTIFICATION_URL, container.getServletURL("/callback") +
                                                      "?jobId=$jobId&status=$status&nodeName=$nodeName");
        conf.set("signal-value", "OK");
        conf.set("external-status", "ok");
        conf.set("error", "end.error");
        conf.set("b", "B");
        conf.set("c", "C");
        conf.set("d", "${c}${c}");
        conf.set("f", "${e}${e}");

        final String jobId1 = engine.submitJob(conf, true);

        WorkflowJob wf = engine.getJob(jobId1);
        XConfiguration wfConf = new XConfiguration(new StringReader(wf.getConf()));
        assertEquals("AA", wfConf.get("a"));
        assertEquals("B", wfConf.get("b"));
        assertEquals("C", conf.get("c"));
        assertEquals("CC", conf.get("d"));
        assertEquals("CCCC", conf.get("e"));
        assertEquals("CCCCCCCC", conf.get("f"));

        waitFor(10000, new Predicate() {
            public boolean evaluate() throws Exception {
                WorkflowJobBean bean = Services.get().get(WorkflowStoreService.class).create().getWorkflow(jobId1, false);
                return bean.getWorkflowInstance().getStatus().isEndState();
            }
        });
        assertEquals(WorkflowJob.Status.KILLED, engine.getJob(jobId1).getStatus());
        waitFor(10000, new Predicate() {
            public boolean evaluate() throws Exception {
                return CallbackServlet.JOB_ID != null;
            }
        });
        assertEquals(wf.getId(), CallbackServlet.JOB_ID);
        assertTrue("kill".equals(CallbackServlet.NODE_NAME) || "a".equals(CallbackServlet.NODE_NAME));
        assertTrue("T:null".equals(CallbackServlet.STATUS) || "T:kill".equals(CallbackServlet.STATUS));
    }

    public void testJobDefinition() throws Exception {
        String workflowPath = getTestCaseFileUri("workflow.xml");
        Reader reader = IOUtils.getResourceAsReader("wf-ext-schema-valid.xml", -1);
        Writer writer = new OutputStreamWriter(new FileOutputStream(new File(getTestCaseDir(), "workflow" +
                ".xml")), StandardCharsets.UTF_8);
        IOUtils.copyCharStream(reader, writer);

        final DagEngine engine = new DagEngine(getTestUser());
        Configuration conf = new XConfiguration();
        conf.set(OozieClient.APP_PATH, workflowPath);
        conf.set(OozieClient.USER_NAME, getTestUser());

        conf.set(OozieClient.LOG_TOKEN, "t");
        conf.set("signal-value", "OK");
        conf.set("external-status", "ok");
        conf.set("error", "end.error");

        String jobId1 = engine.submitJob(conf, false);

        String def = engine.getDefinition(jobId1);
        assertNotNull(def);
    }

    public void testGetJobs() throws Exception {
        String workflowPath = getTestCaseFileUri("workflow.xml");
        Reader reader = IOUtils.getResourceAsReader("wf-ext-schema-valid.xml", -1);
        Writer writer = new OutputStreamWriter(new FileOutputStream(new File(getTestCaseDir(), "workflow" +
                ".xml")), StandardCharsets.UTF_8);
        IOUtils.copyCharStream(reader, writer);

        final DagEngine engine = new DagEngine(getTestUser());
        Configuration conf = new XConfiguration();
        conf.set(OozieClient.APP_PATH, workflowPath);
        conf.set(OozieClient.USER_NAME, getTestUser());

        conf.set(OozieClient.LOG_TOKEN, "t");
        conf.set("signal-value", "OK");
        conf.set("external-status", "ok");
        conf.set("error", "end.error");

        final String jobId1 = engine.submitJob(conf, true);
        String jobId2 = engine.submitJob(conf, false);
/*
        WorkflowsInfo wfInfo = engine.getJobs("group=" + getTestGroup(), 1, 1);
        List<WorkflowJobBean> workflows = wfInfo.getWorkflows();
        assertEquals(1, workflows.size());
        assertEquals(getTestGroup(), workflows.get(0).getGroup());
        assertEquals(jobId1, workflows.get(0).getId());

        wfInfo = engine.getJobs("group=" + getTestGroup(), 1, 5);
        workflows = wfInfo.getWorkflows();
        assertEquals(2, workflows.size());
        assertEquals(getTestGroup(), workflows.get(0).getGroup());
        assertEquals(jobId1, workflows.get(0).getId());
        assertEquals(jobId2, workflows.get(1).getId());

        wfInfo = engine.getJobs("user=" + getTestUser(), 1, 1);
        workflows = wfInfo.getWorkflows();
        assertEquals(1, workflows.size());
        assertEquals(getTestUser(), workflows.get(0).getUser());
        assertEquals(jobId1, workflows.get(0).getId());

        wfInfo = engine.getJobs("user=" + getTestUser(), 2, 5);
        workflows = wfInfo.getWorkflows();
        assertEquals(1, workflows.size());
        assertEquals(getTestUser(), workflows.get(0).getUser());
        assertEquals(jobId2, workflows.get(0).getId());

        waitFor(5000, new Predicate() {
            public boolean evaluate() throws Exception {
                WorkflowJobBean bean = Services.get().get(WorkflowStoreService.class).create().getWorkflow(jobId1, false);
                return bean.getWorkflowInstance().getStatus().isEndState();
            }
        });

        wfInfo = engine.getJobs("status=PREP", 1, 5);
        workflows = wfInfo.getWorkflows();
        assertEquals(1, workflows.size());
        assertEquals(jobId2, workflows.get(0).getId());

        wfInfo = engine.getJobs("name=test-wf", 1, 5);
        workflows = wfInfo.getWorkflows();
        assertEquals(2, workflows.size());
        assertEquals(jobId1, workflows.get(0).getId());
        assertEquals(jobId2, workflows.get(1).getId());

        wfInfo = engine.getJobs("name=test-wf;status=PREP", 1, 5);
        workflows = wfInfo.getWorkflows();
        assertEquals(1, workflows.size());
        assertEquals(jobId2, workflows.get(0).getId());
*/
    }
}