/*

 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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package jdk.nashorn.internal.test.framework;

import static jdk.nashorn.internal.test.framework.TestConfig.OPTIONS_CHECK_COMPILE_MSG;

import static jdk.nashorn.internal.test.framework.TestConfig.OPTIONS_COMPARE;

import static jdk.nashorn.internal.test.framework.TestConfig.OPTIONS_EXPECT_COMPILE_FAIL;

import static jdk.nashorn.internal.test.framework.TestConfig.OPTIONS_EXPECT_RUN_FAIL;

import static jdk.nashorn.internal.test.framework.TestConfig.OPTIONS_IGNORE_STD_ERROR;

import static jdk.nashorn.internal.test.framework.TestConfig.OPTIONS_RUN;

import static jdk.nashorn.internal.test.framework.TestConfig.TEST_FAILED_LIST_FILE;

import static jdk.nashorn.internal.test.framework.TestConfig.TEST_JS_ENABLE_STRICT_MODE;

import static jdk.nashorn.internal.test.framework.TestConfig.TEST_JS_EXCLUDES_FILE;

import static jdk.nashorn.internal.test.framework.TestConfig.TEST_JS_EXCLUDE_DIR;

import static jdk.nashorn.internal.test.framework.TestConfig.TEST_JS_EXCLUDE_LIST;

import static jdk.nashorn.internal.test.framework.TestConfig.TEST_JS_FRAMEWORK;

import static jdk.nashorn.internal.test.framework.TestConfig.TEST_JS_INCLUDES;

import static jdk.nashorn.internal.test.framework.TestConfig.TEST_JS_LIST;

import static jdk.nashorn.internal.test.framework.TestConfig.TEST_JS_ROOTS;

import static jdk.nashorn.internal.test.framework.TestConfig.TEST_JS_UNCHECKED_DIR;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileReader;

import java.io.IOException;

import java.nio.file.FileSystem;

import java.nio.file.FileSystems;

import java.nio.file.FileVisitOption;

import java.nio.file.FileVisitResult;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.SimpleFileVisitor;

import java.nio.file.attribute.BasicFileAttributes;

import java.util.ArrayList;

import java.util.Collections;

import java.util.EnumSet;

import java.util.HashMap;

import java.util.HashSet;

import java.util.List;

import java.util.Map;

import java.util.Scanner;

import java.util.Set;

import javax.xml.xpath.XPath;

import javax.xml.xpath.XPathConstants;

import javax.xml.xpath.XPathExpressionException;

import javax.xml.xpath.XPathFactory;

import org.w3c.dom.NodeList;

import org.xml.sax.InputSource;

/**

 * Utility class to find/parse script test files and to create 'test' instances.

 * Actual 'test' object type is decided by clients of this class.

 */

final class TestFinder {

    private TestFinder() {}

    interface TestFactory<T> {

        // 'test' instance type is decided by the client.

        T createTest(final String framework, final File testFile, final List<String> engineOptions, final Map<String, String> testOptions, final List<String> arguments);

        // place to log messages from TestFinder

        void log(String mg);

    }

    // finds all tests from configuration and calls TestFactory to create 'test' instance for each script test found

    static <T> void findAllTests(final List<T> tests, final Set<String> orphans, final TestFactory<T> testFactory) throws Exception {

        final String framework = System.getProperty(TEST_JS_FRAMEWORK);

        final String testList = System.getProperty(TEST_JS_LIST);

        final String failedTestFileName = System.getProperty(TEST_FAILED_LIST_FILE);

        if(failedTestFileName != null) {

            File failedTestFile = new File(failedTestFileName);

            if(failedTestFile.exists() && failedTestFile.length() > 0L) {

                try(final BufferedReader r = new BufferedReader(new FileReader(failedTestFile))) {

                    for(;;) {

                        final String testFileName = r.readLine();

                        if(testFileName == null) {

                            break;

                        }

                        handleOneTest(framework, new File(testFileName).toPath(), tests, orphans, testFactory);

                    }

                }

                return;

            }

        }

        if (testList == null || testList.length() == 0) {

            // Run the tests under the test roots dir, selected by the

            // TEST_JS_INCLUDES patterns

            final String testRootsString = System.getProperty(TEST_JS_ROOTS, "test/script");

            if (testRootsString == null || testRootsString.length() == 0) {

                throw new Exception("Error: " + TEST_JS_ROOTS + " must be set");

            }

            final String testRoots[] = testRootsString.split(" ");

            final FileSystem fileSystem = FileSystems.getDefault();

            final Set<String> testExcludeSet = getExcludeSet();

            final Path[] excludePaths = getExcludeDirs();

            for (final String root : testRoots) {

                final Path dir = fileSystem.getPath(root);

                findTests(framework, dir, tests, orphans, excludePaths, testExcludeSet, testFactory);

            }

        } else {

            // TEST_JS_LIST contains a blank speparated list of test file names.

            final String strArray[] = testList.split(" ");

            for (final String ss : strArray) {

                handleOneTest(framework, new File(ss).toPath(), tests, orphans, testFactory);

            }

        }

    }

    private static boolean inExcludePath(final Path file, final Path[] excludePaths) {

        if (excludePaths == null) {

            return false;

        }

        for (final Path excludePath : excludePaths) {

            if (file.startsWith(excludePath)) {

                return true;

            }

        }

        return false;

    }

    private static <T> void findTests(final String framework, final Path dir, final List<T> tests, final Set<String> orphanFiles, final Path[] excludePaths, final Set<String> excludedTests, final TestFactory<T> factory) throws Exception {

        final String pattern = System.getProperty(TEST_JS_INCLUDES);

        final String extension = pattern == null ? "js" : pattern;

        final Exception[] exceptions = new Exception[1];

        final List<String> excludedActualTests = new ArrayList<>();

        if (! dir.toFile().isDirectory()) {

            factory.log("WARNING: " + dir + " not found or not a directory");

        }

        Files.walkFileTree(dir, EnumSet.of(FileVisitOption.FOLLOW_LINKS), Integer.MAX_VALUE, new SimpleFileVisitor<Path>() {

            @Override

            public FileVisitResult visitFile(final Path file, final BasicFileAttributes attrs) throws IOException {

                final String fileName = file.getName(file.getNameCount() - 1).toString();

                if (fileName.endsWith(extension)) {

                    final String namex = file.toString().replace('\\', '/');

                    if (!inExcludePath(file, excludePaths) && !excludedTests.contains(file.getFileName().toString())) {

                        try {

                            handleOneTest(framework, file, tests, orphanFiles, factory);

                        } catch (final Exception ex) {

                            exceptions[0] = ex;

                            return FileVisitResult.TERMINATE;

                        }

                    } else {

                        excludedActualTests.add(namex);

                    }

                }

                return FileVisitResult.CONTINUE;

            }

        });

        Collections.sort(excludedActualTests);

        for (final String excluded : excludedActualTests) {

            factory.log("Excluding " + excluded);

        }

        if (exceptions[0] != null) {

            throw exceptions[0];

        }

    }

    private static final String uncheckedDirs[] = System.getProperty(TEST_JS_UNCHECKED_DIR, "test/script/external/test262/").split(" ");

    private static boolean isUnchecked(final Path testFile) {

        for (final String uncheckedDir : uncheckedDirs) {

            if (testFile.startsWith(uncheckedDir)) {

                return true;

            }

        }

        return false;

    }

    private static <T> void handleOneTest(final String framework, final Path testFile, final List<T> tests, final Set<String> orphans, TestFactory<T> factory) throws Exception {

        final String name = testFile.getFileName().toString();

        assert name.lastIndexOf(".js") > 0 : "not a JavaScript: " + name;

        // defaults: testFile is a test and should be run

        boolean isTest = isUnchecked(testFile);

        boolean isNotTest = false;

        boolean shouldRun = true;

        boolean compileFailure = false;

        boolean runFailure = false;

        boolean checkCompilerMsg = false;

        boolean noCompare = false;

        boolean ignoreStdError = false;

        final List<String> engineOptions = new ArrayList<>();

        final List<String> scriptArguments = new ArrayList<>();

        boolean inComment = false;

        try (Scanner scanner = new Scanner(testFile)) {

            while (scanner.hasNext()) {

                // TODO: Scan for /ref=file qualifiers, etc, to determine run

                // behavior

                String token = scanner.next();

                if (token.startsWith("/*")) {

                    inComment = true;

                } else if (token.endsWith(("*/"))) {

                    inComment = false;

                } else if (!inComment) {

                    continue;

                }

                // remove whitespace and trailing semicolons, if any

                // (trailing semicolons are found in some sputnik tests)

                token = token.trim();

                final int semicolon = token.indexOf(';');

                if (semicolon > 0) {

                    token = token.substring(0, semicolon);

                }

                switch (token) {

                case "@test":

                    isTest = true;

                    break;

                case "@test/fail":

                    isTest = true;

                    compileFailure = true;

                    break;

                case "@test/compile-error":

                    isTest = true;

                    compileFailure = true;

                    checkCompilerMsg = true;

                    shouldRun = false;

                    break;

                case "@test/warning":

                    isTest = true;

                    checkCompilerMsg = true;

                    break;

                case "@test/nocompare":

                    isTest = true;

                    noCompare = true;

                    break;

                case "@subtest":

                    isTest = false;

                    isNotTest = true;

                    break;

                case "@runif":

                    if (System.getProperty(scanner.next()) != null) {

                        shouldRun = true;

                    } else {

                        isTest = false;

                        isNotTest = true;

                    }

                    break;

                case "@run":

                    shouldRun = true;

                    break;

                case "@run/fail":

                    shouldRun = true;

                    runFailure = true;

                    break;

                case "@run/ignore-std-error":

                    shouldRun = true;

                    ignoreStdError = true;

                    break;

                case "@argument":

                    scriptArguments.add(scanner.next());

                    break;

                case "@option":

                    engineOptions.add(scanner.next());

                    break;

                }

                // negative tests are expected to fail at runtime only

                // for those tests that are expected to fail at compile time,

                // add @test/compile-error

                if (token.equals("@negative") || token.equals("@strict_mode_negative")) {

                    shouldRun = true;

                    runFailure = true;

                }

                if (token.equals("@strict_mode") || token.equals("@strict_mode_negative") || token.equals("@onlyStrict") || token.equals("@noStrict")) {

                    if (!strictModeEnabled()) {

                        return;

                    }

                }

            }

        } catch (final Exception ignored) {

            return;

        }

        if (isTest) {

            final Map<String, String> testOptions = new HashMap<>();

            if (compileFailure) {

                testOptions.put(OPTIONS_EXPECT_COMPILE_FAIL, "true");

            }

            if (shouldRun) {

                testOptions.put(OPTIONS_RUN, "true");

            }

            if (runFailure) {

                testOptions.put(OPTIONS_EXPECT_RUN_FAIL, "true");

            }

            if (checkCompilerMsg) {

                testOptions.put(OPTIONS_CHECK_COMPILE_MSG, "true");

            }

            if (!noCompare) {

                testOptions.put(OPTIONS_COMPARE, "true");

            }

            if (ignoreStdError) {

                testOptions.put(OPTIONS_IGNORE_STD_ERROR, "true");

            }

            tests.add(factory.createTest(framework, testFile.toFile(), engineOptions, testOptions, scriptArguments));

        } else if (!isNotTest) {

            orphans.add(name);

        }

    }

    private static boolean strictModeEnabled() {

        return Boolean.getBoolean(TEST_JS_ENABLE_STRICT_MODE);

    }

    private static Set<String> getExcludeSet() throws XPathExpressionException {

        final String testExcludeList = System.getProperty(TEST_JS_EXCLUDE_LIST);

        String[] testExcludeArray = {};

        if (testExcludeList != null) {

            testExcludeArray = testExcludeList.split(" ");

        }

        final Set<String> testExcludeSet = new HashSet<>(testExcludeArray.length);

        for (final String test : testExcludeArray) {

            testExcludeSet.add(test);

        }

        final String testExcludesFile = System.getProperty(TEST_JS_EXCLUDES_FILE);

        if (testExcludesFile != null && !testExcludesFile.isEmpty()) {

            try {

                loadExcludesFile(testExcludesFile, testExcludeSet);

            } catch (final XPathExpressionException e) {

                System.err.println("Error: unable to load test excludes from " + testExcludesFile);

                e.printStackTrace();

                throw e;

            }

        }

        return testExcludeSet;

    }

    private static void loadExcludesFile(final String testExcludesFile, final Set<String> testExcludeSet) throws XPathExpressionException {

        final XPath xpath = XPathFactory.newInstance().newXPath();

        final NodeList testIds = (NodeList)xpath.evaluate("/excludeList/test/@id", new InputSource(testExcludesFile), XPathConstants.NODESET);

        for (int i = testIds.getLength() - 1; i >= 0; i--) {

            testExcludeSet.add(testIds.item(i).getNodeValue());

        }

    }

    private static Path[] getExcludeDirs() {

        final String excludeDirs[] = System.getProperty(TEST_JS_EXCLUDE_DIR, "test/script/currently-failing").split(" ");

        final Path[] excludePaths = new Path[excludeDirs.length];

        final FileSystem fileSystem = FileSystems.getDefault();

        int i = 0;

        for (final String excludeDir : excludeDirs) {

            excludePaths[i++] = fileSystem.getPath(excludeDir);

        }

        return excludePaths;

    }

}