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/*

 * @test

 * @bug 8160489

 * @summary tests for --patch-modules

 * @library /tools/lib

 * @modules

 *      jdk.compiler/com.sun.tools.javac.api

 *      jdk.compiler/com.sun.tools.javac.file

 *      jdk.compiler/com.sun.tools.javac.main

 * @build toolbox.ToolBox toolbox.JavacTask toolbox.ModuleBuilder ModuleTestBase

 * @run main PatchModulesTest

 */

import java.io.File;

import java.io.IOException;

import java.io.PrintWriter;

import java.io.StringWriter;

import java.lang.reflect.Field;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.util.List;

import java.util.Map;

import java.util.stream.Collectors;

import javax.tools.JavaFileObject;

import javax.tools.ToolProvider;

import com.sun.source.util.JavacTask;

import com.sun.tools.javac.api.JavacTool;

import com.sun.tools.javac.file.BaseFileManager;

import com.sun.tools.javac.file.JavacFileManager;

import com.sun.tools.javac.file.Locations;

import static java.util.Arrays.asList;

public class PatchModulesTest extends ModuleTestBase {

    public static void main(String... args) throws Exception {

        PatchModulesTest t = new PatchModulesTest();

        t.init();

        t.runTests();

    }

    private static String PS = File.pathSeparator;

    void init() throws IOException {

        tb.createDirectories("a", "b", "c", "d", "e");

        tb.writeJavaFiles(Paths.get("."), "class C { }");

    }

    @Test

    public void testSimple(Path base) throws Exception {

        test(asList("java.base=a"),

            "{java.base=[a]}");

    }

    @Test

    public void testPair(Path base) throws Exception {

        test(asList("java.base=a", "java.compiler=b"),

            "{java.base=[a], java.compiler=[b]}");

    }

    @Test

    public void testMultiple(Path base) throws Exception {

        test(asList("java.base=a:b"),

            "{java.base=[a, b]}");

    }

    @Test

    public void testLastOneWins(Path base) throws Exception {

        test(asList("java.base=a", "java.compiler=b", "java.base=c"),

            "{java.base=[c], java.compiler=[b]}");

    }

    void test(List<String> patches, String expect) throws Exception {

        JavacTool tool = (JavacTool) ToolProvider.getSystemJavaCompiler();

        StringWriter sw = new StringWriter();

        try (PrintWriter pw = new PrintWriter(sw)) {

            JavacFileManager fm = tool.getStandardFileManager(null, null, null);

            List<String> opts = patches.stream()

                .map(p -> "--patch-module=" + p.replace(":", PS))

                .collect(Collectors.toList());

            Iterable<? extends JavaFileObject> files = fm.getJavaFileObjects("C.java");

            JavacTask task = tool.getTask(pw, fm, null, opts, null, files);

            Field locationsField = BaseFileManager.class.getDeclaredField("locations");

            locationsField.setAccessible(true);

            Object locations = locationsField.get(fm);

            Field patchMapField = Locations.class.getDeclaredField("patchMap");

            patchMapField.setAccessible(true);

            Map<?,?> patchMap = (Map<?,?>) patchMapField.get(locations);

            String found = patchMap.toString();

            if (!found.equals(expect)) {

                tb.out.println("Expect: " + expect);

                tb.out.println("Found:  " + found);

                error("output not as expected");

            }

        }

    }

}