// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.config.application;

import com.yahoo.config.provision.Environment;
import com.yahoo.config.provision.RegionName;
import org.custommonkey.xmlunit.XMLUnit;
import org.junit.Test;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.stream.XMLStreamException;
import javax.xml.transform.TransformerException;
import java.io.IOException;
import java.io.StringReader;

/**
 * @author bratseth
 */
public class HostedOverrideProcessorTest {

    static {
        XMLUnit.setIgnoreWhitespace(true);
    }

    private static final String input =
                "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>" +
                "<services xmlns:deploy=\"vespa\" xmlns:preprocess=\"?\" version=\"1.0\">" +
                "  <container id=\"foo\" version=\"1.0\">" +
                "    <nodes count='1'/>" +
                "    <nodes deploy:environment=\"staging\" count='2'/>" +
                "    <nodes deploy:environment=\"prod\" count='3'/>" +
                "    <nodes deploy:environment=\"prod\" deploy:region=\"us-west\" count='4'/>" +
                "  </container>" +
                "</services>";


    @Test
    public void testParsingDefault() throws IOException, SAXException, XMLStreamException, ParserConfigurationException, TransformerException {
        String expected = 
                "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>" +
                "<services xmlns:deploy=\"vespa\" xmlns:preprocess=\"?\" version=\"1.0\">" +
                "  <container id=\"foo\" version=\"1.0\">" +
                "    <nodes count='1'/>" +
                "  </container>" +
                "</services>";
        assertOverride(Environment.test, RegionName.defaultName(), expected);
    }

    @Test
    public void testParsingEnvironmentAndRegion() throws ParserConfigurationException, IOException, SAXException, TransformerException {
        String expected = 
                "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>" +
                "<services xmlns:deploy=\"vespa\" xmlns:preprocess=\"?\" version=\"1.0\">" +
                "  <container id=\"foo\" version=\"1.0\">" +
                "    <nodes count='4' required='true'/>" +
                "  </container>" +
                "</services>";
        assertOverride(Environment.from("prod"), RegionName.from("us-west"), expected);
    }

    @Test
    public void testParsingEnvironmentUnknownRegion() throws ParserConfigurationException, IOException, SAXException, TransformerException {
        String expected =
                "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>" +
                "<services xmlns:deploy=\"vespa\" xmlns:preprocess=\"?\" version=\"1.0\">" +
                "  <container id=\"foo\" version=\"1.0\">" +
                "    <nodes count='3' required='true'/>" +
                "  </container>" +
                "</services>";
        assertOverride(Environment.valueOf("prod"), RegionName.from("us-east"), expected);
    }

    @Test
    public void testParsingEnvironmentNoRegion() throws ParserConfigurationException, IOException, SAXException, TransformerException {
        String expected =
                "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>" +
                "<services xmlns:deploy=\"vespa\" xmlns:preprocess=\"?\" version=\"1.0\">" +
                "  <container id=\"foo\" version=\"1.0\">" +
                "    <nodes count='3' required='true'/>" +
                "  </container>" +
                "</services>";
        assertOverride(Environment.from("prod"), RegionName.defaultName(), expected);
    }

    @Test
    public void testParsingUnknownEnvironment() throws ParserConfigurationException, IOException, SAXException, TransformerException {
        String expected =
                "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>" +
                "<services xmlns:deploy=\"vespa\" xmlns:preprocess=\"?\" version=\"1.0\">" +
                "  <container id=\"foo\" version=\"1.0\">" +
                "    <nodes count='1'/>" +
                "  </container>" +
                "</services>";
        assertOverride(Environment.from("dev"), RegionName.defaultName(), expected);
    }

    @Test
    public void testParsingUnknownEnvironmentUnknownRegion() throws ParserConfigurationException, IOException, SAXException, TransformerException {
        String expected =
                "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>" +
                "<services xmlns:deploy=\"vespa\" xmlns:preprocess=\"?\" version=\"1.0\">" +
                "  <container id=\"foo\" version=\"1.0\">" +
                "    <nodes count='1'/>" +
                "  </container>" +
                "</services>";
        assertOverride(Environment.from("test"), RegionName.from("us-west"), expected);
    }

    @Test
    public void testParsingInheritEnvironment() throws ParserConfigurationException, IOException, SAXException, TransformerException {
        String expected =
                "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>" +
                "<services xmlns:deploy=\"vespa\" xmlns:preprocess=\"?\" version=\"1.0\">" +
                "  <container id=\"foo\" version=\"1.0\">" +
                "    <nodes count='2' required='true'/>" +
                "  </container>" +
                "</services>";
        assertOverride(Environment.from("staging"), RegionName.from("us-west"), expected);
    }

    private void assertOverride(Environment environment, RegionName region, String expected) throws TransformerException {
        Document inputDoc = Xml.getDocument(new StringReader(input));
        Document newDoc = new OverrideProcessor(environment, region).process(inputDoc);
        TestBase.assertDocument(expected, newDoc);
    }

}