/*

 * Copyright (c) 2014, 2016, 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 com.sun.tools.sjavac.options;

import java.io.File;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.util.ArrayList;

import java.util.List;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import com.sun.tools.sjavac.CopyFile;

import com.sun.tools.sjavac.Transformer;

/**

 * Sjavac options can be classified as:

 *

 *  (1) relevant only for sjavac, such as --server

 *  (2) relevant for sjavac and javac, such as -d, or

 *  (3) relevant only for javac, such as -g.

 *

 * This enum represents all options from (1) and (2). Note that instances of

 * this enum only entail static information about the option. For storage of

 * option values, refer to com.sun.tools.sjavac.options.Options.

 *

 *  <p><b>This is NOT part of any supported API.

 *  If you write code that depends on this, you do so at your own risk.

 *  This code and its internal interfaces are subject to change or

 *  deletion without notice.</b>

 */

public enum Option {

    SRC("-src", "Location of source files to be compiled") {

        @Override

        protected void processMatching(ArgumentIterator iter, OptionHelper helper) {

            List<Path> paths = getFileListArg(iter, helper);

            if (paths != null)

                helper.sourceRoots(paths);

        }

    },

        @Override

        protected void processMatching(ArgumentIterator iter, OptionHelper helper) {

            List<Path> paths = getFileListArg(iter, helper);

            if (paths != null)

                helper.sourcepath(paths);

        }

    },

        @Override

        protected void processMatching(ArgumentIterator iter, OptionHelper helper) {

            List<Path> paths = getFileListArg(iter, helper);

            if (paths != null)

                helper.modulepath(paths);

        }

    },

        @Override

        protected void processMatching(ArgumentIterator iter, OptionHelper helper) {

            List<Path> paths = getFileListArg(iter, helper);

            if (paths != null)

                helper.classpath(paths);

        }

    },

    CP("-cp", "An alias for -classpath") {

        @Override

        protected void processMatching(ArgumentIterator iter, OptionHelper helper) {

        }

    },

    X("-x", "Exclude files matching the given pattern") {

        @Override

        protected void processMatching(ArgumentIterator iter, OptionHelper helper) {

            String pattern = getFilePatternArg(iter, helper);

            if (pattern != null)

                helper.exclude(pattern);

        }

    },

    I("-i", "Include only files matching the given pattern") {

        @Override

        protected void processMatching(ArgumentIterator iter, OptionHelper helper) {

            String pattern = getFilePatternArg(iter, helper);

            if (pattern != null)

                helper.include(pattern);

        }

    },

    TR("-tr", "Translate resources") {

        @Override

        protected void processMatching(ArgumentIterator iter, OptionHelper helper) {

            if (!iter.hasNext()) {

                helper.reportError(arg + " must be followed by a translation rule");

                return;

            }

            String trArg = iter.next();

            // Validate argument syntax. Examples:

            //   .prop=com.sun.tools.javac.smart.CompileProperties

            //   .idl=com.sun.corba.CompileIdl

            //   .g3=antlr.CompileGrammar,debug=true

            String ident = "[a-zA-Z_][a-zA-Z0-9_]*";

            Pattern p = Pattern.compile("(?<suffix>\\." + ident + ")=" +

                                        "(?<class>" + ident + "(\\." + ident + ")*)" +

                                        "(?<extra>,.*)?");

            // Check syntax

            Matcher m = p.matcher(trArg);

            if (!m.matches()) {

                helper.reportError("The string \"" + trArg + "\" is not a " +

                                   "valid translate pattern");

                return;

            }

            // Extract relevant parts

            String suffix = m.group("suffix");

            String classname = m.group("class");

            String extra = m.group("extra");

            // Valid suffix?

            if (suffix.matches("\\.(class|java)")) {

                helper.reportError("You cannot have a translator for " +

                                   suffix + " files!");

                return;

            }

            // Construct transformer

            try {

                Class<?> trCls = Class.forName(classname);

                Transformer transformer =

                    (Transformer) trCls.getConstructor().newInstance();

                transformer.setExtra(extra);

                helper.addTransformer(suffix, transformer);

            } catch (Exception e) {

                helper.reportError("Cannot use " + classname +

                                   " as a translator: " + e.getMessage());

            }

        }

    },

    COPY("-copy", "Copy resources") {

        @Override

        protected void processMatching(ArgumentIterator iter, OptionHelper helper) {

            if (!iter.hasNext()) {

                helper.reportError(arg + " must be followed by a resource type");

                return;

            }

            String copyArg = iter.next();

            // Validate argument syntax. Examples: .gif, .html

            if (!copyArg.matches("\\.[a-zA-Z_][a-zA-Z0-9_]*")) {

                helper.reportError("The string \"" + copyArg + "\" is not a " +

                                   "valid resource type.");

                return;

            }

            helper.addTransformer(copyArg, new CopyFile());

        }

    },

    J("-j", "Number of cores") {

        @Override

        protected void processMatching(ArgumentIterator iter, OptionHelper helper) {

            if (!iter.hasNext() || !iter.peek().matches("\\d+")) {

                helper.reportError(arg + " must be followed by an integer");

                return;

            }

            helper.numCores(Integer.parseInt(iter.next()));

        }

    },

    SERVER("--server:", "Specify server configuration file of running server") {

        @Override

        protected void processMatching(ArgumentIterator iter, OptionHelper helper) {

            helper.serverConf(iter.current().substring(arg.length()));

        }

    },

    STARTSERVER("--startserver:", "Start server and use the given configuration file") {

        @Override

        protected void processMatching(ArgumentIterator iter, OptionHelper helper) {

            helper.startServerConf(iter.current().substring(arg.length()));

        }

    },

    IMPLICIT("-implicit:", "Specify how to treat implicitly referenced source code") {

        @Override

        protected void processMatching(ArgumentIterator iter, OptionHelper helper) {

            helper.implicit(iter.current().substring(arg.length()));

        }

    },

    LOG("--log=", "Specify logging level") {

        @Override

        protected void processMatching(ArgumentIterator iter, OptionHelper helper) {

            helper.logLevel(iter.current().substring(arg.length()));

        }

    },

    VERBOSE("-verbose", "Set verbosity level to \"info\"") {

        @Override

        protected void processMatching(ArgumentIterator iter, OptionHelper helper) {

            helper.logLevel("info");

        }

    },

    PERMIT_ARTIFACT("--permit-artifact=", "Allow this artifact in destination directory") {

        @Override

        protected void processMatching(ArgumentIterator iter, OptionHelper helper) {

            String a = iter.current().substring(arg.length());

            helper.permitArtifact(Paths.get(a).toFile().getAbsolutePath());

        }

    },

    PERMIT_UNIDENTIFIED_ARTIFACTS("--permit-unidentified-artifacts", "Allow unidentified artifacts in destination directory") {

        @Override

        protected void processMatching(ArgumentIterator iter, OptionHelper helper) {

            helper.permitUnidentifiedArtifacts();

        }

    },

    PERMIT_SOURCES_WITHOUT_PACKAGE("--permit-sources-without-package", "Permit sources in the default package") {

        @Override

        protected void processMatching(ArgumentIterator iter, OptionHelper helper) {

            helper.permitDefaultPackage();

        }

    },

    COMPARE_FOUND_SOURCES("--compare-found-sources", "Compare found sources with given sources") {

        @Override

        protected void processMatching(ArgumentIterator iter, OptionHelper helper) {

            Path referenceSourceList = getFileArg(iter, helper, true, false);

            if (referenceSourceList != null)

                helper.compareFoundSources(referenceSourceList);

        }

    },

    D("-d", "Output destination directory") {

        @Override

        protected void processMatching(ArgumentIterator iter, OptionHelper helper) {

            Path dir = getFileArg(iter, helper, false, true);

            if (dir != null)

                helper.destDir(dir);

        }

    },

    S("-s", "Directory for generated sources") {

        @Override

        protected void processMatching(ArgumentIterator iter, OptionHelper helper) {

            Path dir = getFileArg(iter, helper, false, true);

            if (dir != null)

                helper.generatedSourcesDir(dir);

        }

    },

    H("-h", "Directory for header files") {

        @Override

        protected void processMatching(ArgumentIterator iter, OptionHelper helper) {

            Path dir = getFileArg(iter, helper, false, true);

            if (dir != null)

                helper.headerDir(dir);

        }

    },

    STATE_DIR("--state-dir=", "Directory used to store sjavac state and log files.") {

        @Override

        protected void processMatching(ArgumentIterator iter, OptionHelper helper) {

            String p = iter.current().substring(arg.length());

            helper.stateDir(Paths.get(p));

        }

    };

    public final String arg;

    final String description;

    private Option(String arg, String description) {

        this.arg = arg;

        this.description = description;

    }

    /** Retrieve and verify syntax of file list argument. */

    List<Path> getFileListArg(ArgumentIterator iter, OptionHelper helper) {

        if (!iter.hasNext()) {

            helper.reportError(arg + " must be followed by a list of files " +

                              "separated by " + File.pathSeparator);

            return null;

        }

        List<Path> result = new ArrayList<>();

        for (String pathStr : iter.next().split(File.pathSeparator))

            result.add(Paths.get(pathStr));

        return result;

    }

    /** Retrieve and verify syntax of file argument. */

    Path getFileArg(ArgumentIterator iter, OptionHelper helper, boolean fileAcceptable, boolean dirAcceptable) {

        if (!iter.hasNext()) {

            String errmsg = arg + " must be followed by ";

            if (fileAcceptable && dirAcceptable) errmsg += "a file or directory.";

            else if (fileAcceptable) errmsg += "a file.";

            else if (dirAcceptable)  errmsg += "a directory.";

            else throw new IllegalArgumentException("File or directory must be acceptable.");

            helper.reportError(errmsg);

            return null;

        }

        return Paths.get(iter.next());

    }

    /** Retrieve the next file or package argument. */

    String getFilePatternArg(ArgumentIterator iter, OptionHelper helper) {

        if (!iter.hasNext()) {

            helper.reportError(arg + " must be followed by a glob pattern.");

            return null;

        }

        return iter.next();

    }

    // Future cleanup: Change the "=" syntax to ":" syntax to be consistent and

    // to follow the javac-option style.

    public boolean hasOption() {

        return arg.endsWith(":") || arg.endsWith("=");

    }

    /**

     * Process current argument of argIter.

     *

     * It's final, since the option customization is typically done in

     * processMatching.

     *

     * @param argIter Iterator to read current and succeeding arguments from.

     * @param helper The helper to report back to.

     * @return true iff the argument was processed by this option.

     */

    public final boolean processCurrent(ArgumentIterator argIter,

                                        OptionHelper helper) {

        String fullArg = argIter.current(); // "-tr" or "-log=level"

        if (hasOption() ? fullArg.startsWith(arg) : fullArg.equals(arg)) {

            processMatching(argIter, helper);

            return true;

        }

        // Did not match

        return false;

    }

    /** Called by process if the current argument matches this option. */

    protected abstract void processMatching(ArgumentIterator argIter,

                                            OptionHelper helper);

}