package pl.edu.mimuw.cloudatlas.agent;

import org.junit.Before;
import org.junit.Test;
import static org.junit.Assert.*;
import static org.hamcrest.CoreMatchers.hasItems;

import java.util.concurrent.TimeUnit;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Set;

import pl.edu.mimuw.cloudatlas.Container;
import pl.edu.mimuw.cloudatlas.agent.modules.ModuleType;
import pl.edu.mimuw.cloudatlas.agent.messages.AgentMessage;
import pl.edu.mimuw.cloudatlas.agent.messages.RequestStateMessage;
import pl.edu.mimuw.cloudatlas.agent.messages.StateMessage;
import pl.edu.mimuw.cloudatlas.model.AttributesMap;
import pl.edu.mimuw.cloudatlas.model.ValueString;
import pl.edu.mimuw.cloudatlas.model.ValueTime;
import pl.edu.mimuw.cloudatlas.model.ZMI;

public class NewApiImplementationTests {
    private NewApiImplementation api;
    private MockEventBus eventBus;

    @Before
    public void initializeApi() throws Exception {
        eventBus = new MockEventBus();
        api = new NewApiImplementation(eventBus);
    }

    @Test
    public void testGetZoneSet() throws Exception {
        final Set<String> zoneSet = new HashSet();
        final Container<Exception> exceptionContainer = new Container();
        Thread apiThread = new Thread(() -> {
            try {
                zoneSet.addAll(api.getZoneSet());
            } catch (Exception e) {
                exceptionContainer.thing = e;
            }
        });
        apiThread.start();

        AgentMessage message = eventBus.events.poll(100, TimeUnit.MILLISECONDS);
        assertNotNull(message);
        assertEquals(ModuleType.RMI, message.getDestinationModule());
        RequestStateMessage requestMessage = (RequestStateMessage) message;

        ZMI root = new ZMI();
        StateMessage responseMessage = new StateMessage("", ModuleType.RMI, 0, 0, root, null);
        requestMessage.getFuture().complete(responseMessage);

        apiThread.join(100);
        assertFalse(apiThread.isAlive());
        assertNull(exceptionContainer.thing);

        assertThat(zoneSet, hasItems("/"));
    }

    @Test
    public void testRootGetZoneAttributeValues() throws Exception {
        final Container<AttributesMap> attributes = new Container();
        final Container<Exception> exceptionContainer = new Container();
        Thread apiThread = new Thread(() -> {
            try {
                attributes.thing = api.getZoneAttributeValues("/");
            } catch (Exception e) {
                exceptionContainer.thing = e;
            }
        });
        apiThread.start();

        AgentMessage message = eventBus.events.poll(100, TimeUnit.MILLISECONDS);
        assertNotNull(message);
        assertEquals(ModuleType.RMI, message.getDestinationModule());
        RequestStateMessage requestMessage = (RequestStateMessage) message;

        ZMI zmi = new ZMI();
        zmi.getAttributes().add("timestamp", new ValueTime(42l));
        StateMessage response = new StateMessage("", ModuleType.RMI, 0, 0, zmi, new HashMap());
        requestMessage.getFuture().complete(response);

        apiThread.join(100);
        assertFalse(apiThread.isAlive());
        assertNull(exceptionContainer.thing);

        assertEquals(new ValueTime(42l), attributes.thing.getOrNull("timestamp"));
    }

    @Test
    public void testGetZoneAttributeValues() throws Exception {
        final Container<AttributesMap> attributes = new Container();
        final Container<Exception> exceptionContainer = new Container();
        Thread apiThread = new Thread(() -> {
            try {
                attributes.thing = api.getZoneAttributeValues("/son");
            } catch (Exception e) {
                exceptionContainer.thing = e;
            }
        });
        apiThread.start();

        AgentMessage message = eventBus.events.poll(100, TimeUnit.MILLISECONDS);
        assertNotNull(message);
        assertEquals(ModuleType.RMI, message.getDestinationModule());
        RequestStateMessage requestMessage = (RequestStateMessage) message;

        ZMI zmi = new ZMI();
        zmi.getAttributes().add("timestamp", new ValueTime(42l));
        ZMI son = new ZMI(zmi);
        zmi.addSon(son);
        son.getAttributes().add("name", new ValueString("son"));
        son.getAttributes().add("timestamp", new ValueTime(43l));
        StateMessage response = new StateMessage("", ModuleType.RMI, 0, 0, zmi, new HashMap());
        requestMessage.getFuture().complete(response);

        apiThread.join(100);
        assertFalse(apiThread.isAlive());
        assertNull(exceptionContainer.thing);

        assertEquals(new ValueTime(43l), attributes.thing.getOrNull("timestamp"));
        assertEquals(new ValueString("son"), attributes.thing.getOrNull("name"));
    }

    /*
    @Test
    public void testIntermediateGetZoneAttributeValue() throws Exception {
        AttributesMap attributes = api.getZoneAttributeValues("/uw");
        assertEquals(new ValueInt(1l), attributes.get("level"));
        assertEquals(new ValueString("uw"), attributes.get("name"));
    }

    @Test
    public void testLeafGetZoneAttributeValue() throws Exception {
        AttributesMap attributes = api.getZoneAttributeValues("/pjwstk/whatever01");
        assertEquals(new ValueInt(2l), attributes.get("level"));
        assertEquals(new ValueString("whatever01"), attributes.get("name"));
        assertEquals(new ValueString("/pjwstk/whatever01"), attributes.get("owner"));
        assertEquals(new ValueTime("2012/11/09 21:12:00.000"), attributes.get("timestamp"));
        assertEquals(new ValueInt(1l), attributes.get("cardinality"));
        assertEquals(new ValueTime("2012/10/18 07:03:00.000"), attributes.get("creation"));
        assertEquals(new ValueDouble(0.1), attributes.get("cpu_usage"));
        assertEquals(new ValueInt(7l), attributes.get("num_cores"));
        assertEquals(new ValueInt(215l), attributes.get("num_processes"));

        List<Value> phpModules = new ArrayList<Value>();
        phpModules.add(new ValueString("rewrite"));
        assertEquals(new ValueList(phpModules, TypePrimitive.STRING), attributes.get("php_modules"));
    }

    @Test
    public void testInstallQuery() throws Exception {
        String name = "&query";
        String queryCode = "SELECT 1 AS one";
        api.installQuery(name, queryCode);
        assertAttributeInZmiEquals(name, new ValueQuery(queryCode), "/");
        assertAttributeInZmiEquals(name, new ValueQuery(queryCode), "/uw");
        assertAttributeInZmiEquals(name, new ValueQuery(queryCode), "/pjwstk");
    }

    @Test
    public void testInstallQueryRuns() throws Exception {
        api.installQuery("&query", "SELECT 1 AS one");
        assertAttributeInZmiEquals("one", new ValueInt(1l), "/");
        assertAttributeInZmiEquals("one", new ValueInt(1l), "/uw");
        assertAttributeInZmiEquals("one", new ValueInt(1l), "/pjwstk");
    }

    @Test
    public void testInstallQueryRuns2() throws Exception {
        api.installQuery("&query", "SELECT sum(num_processes) AS num_processes");
        assertAttributeInZmiEquals("num_processes", new ValueInt(362l), "/uw");
        assertAttributeInZmiEquals("num_processes", new ValueInt(437l), "/pjwstk");
        assertAttributeInZmiEquals("num_processes", new ValueInt(799l), "/");
    }

    @Test
    public void testInstallQueryWithInvalidNameFails() throws Exception {
        String name = "query";
        String queryCode = "SELECT 1 AS one";
        try {
            api.installQuery(name, queryCode);
            assertTrue("should have thrown", false);
        } catch (Exception e) {
            assertEquals("Invalid query identifier", e.getMessage());
        }
    }

    public void assertAttributeInZmiEquals(String attribute, Value expected, String zmiPath) throws Exception {
        AttributesMap attributes = api.getZoneAttributeValues(zmiPath);
        assertEquals(expected, attributes.get(attribute));
    }

    @Test
    public void testUninstallQuery() throws Exception {
        String name = "&query";
        String queryCode = "SELECT 1 AS one";
        api.installQuery(name, queryCode);
        api.uninstallQuery(name);
        AttributesMap attributes = api.getZoneAttributeValues("/pjwstk");
        assertNull(attributes.getOrNull(name));
    }

    @Test
    public void testSetAttributeValueChange() throws Exception {
        Value numProcesses = new ValueInt(42l);
        api.setAttributeValue("/uw/khaki13", "num_processes", numProcesses);
        AttributesMap attributes = api.getZoneAttributeValues("/uw/khaki13");
        assertEquals(numProcesses, attributes.get("num_processes"));
    }

    @Test
    public void testSetAttributeValueAdd() throws Exception {
        Value numProcesses = new ValueInt(42l);
        api.setAttributeValue("/uw/khaki13", "an_attribute", numProcesses);
        AttributesMap attributes = api.getZoneAttributeValues("/uw/khaki13");
        assertEquals(numProcesses, attributes.get("an_attribute"));
    }

    @Test
    public void testSetAttributeValueRunsQueries() throws Exception {
        api.installQuery("&query", "SELECT sum(num_processes) AS num_processes");
        Value numProcesses = new ValueInt(42l);
        api.setAttributeValue("/uw/khaki13", "num_processes", numProcesses);
        assertAttributeInZmiEquals("num_processes", new ValueInt(297l), "/uw");
        assertAttributeInZmiEquals("num_processes", new ValueInt(437l), "/pjwstk");
        assertAttributeInZmiEquals("num_processes", new ValueInt(734l), "/");
    }
    */
}