/*
 * Anarres C Preprocessor
 * Copyright (c) 2007-2008, Shevek
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied.  See the License for the specific language governing
 * permissions and limitations under the License.
 */
package org.anarres.cpp;

import java.io.File;
import java.io.PrintStream;
import java.util.Arrays;
import java.util.EnumSet;
import java.util.List;
import javax.annotation.Nonnull;
import joptsimple.OptionParser;
import joptsimple.OptionSet;
import joptsimple.OptionSpec;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * (Currently a simple test class).
 */
public class Main {

    private static final Logger LOG = LoggerFactory.getLogger(Main.class);

    @Nonnull
    private static CharSequence getWarnings() {
        StringBuilder buf = new StringBuilder();
        for (Warning w : Warning.values()) {
            if (buf.length() > 0)
                buf.append(", ");
            String name = w.name().toLowerCase();
            buf.append(name.replace('_', '-'));
        }
        return buf;
    }

    public static void main(String[] args) throws Exception {
        (new Main()).run(args);
    }

    public void run(String[] args) throws Exception {

        OptionParser parser = new OptionParser();
        OptionSpec<?> helpOption = parser.accepts("help",
                "Displays command-line help.")
                .forHelp();
        OptionSpec<?> versionOption = parser.acceptsAll(Arrays.asList("version"),
                "Displays the product version (" + BuildMetadata.getInstance().getVersion() + ") and exits.")
                .forHelp();

        OptionSpec<?> debugOption = parser.acceptsAll(Arrays.asList("debug"),
                "Enables debug output.");

        OptionSpec<String> defineOption = parser.acceptsAll(Arrays.asList("define", "D"),
                "Defines the given macro.")
                .withRequiredArg().ofType(String.class).describedAs("name[=definition]");
        OptionSpec<String> undefineOption = parser.acceptsAll(Arrays.asList("undefine", "U"),
                "Undefines the given macro, previously either builtin or defined using -D.")
                .withRequiredArg().describedAs("name");
        OptionSpec<File> includeOption = parser.accepts("include",
                "Process file as if \"#" + "include \"file\"\" appeared as the first line of the primary source file.")
                .withRequiredArg().ofType(File.class).describedAs("file");
        OptionSpec<File> incdirOption = parser.acceptsAll(Arrays.asList("incdir", "I"),
                "Adds the directory dir to the list of directories to be searched for header files.")
                .withRequiredArg().ofType(File.class).describedAs("dir");
        OptionSpec<File> iquoteOption = parser.acceptsAll(Arrays.asList("iquote"),
                "Adds the directory dir to the list of directories to be searched for header files included using \"\".")
                .withRequiredArg().ofType(File.class).describedAs("dir");
        OptionSpec<String> warningOption = parser.acceptsAll(Arrays.asList("warning", "W"),
                "Enables the named warning class (" + getWarnings() + ").")
                .withRequiredArg().ofType(String.class).describedAs("warning");
        OptionSpec<Void> noWarningOption = parser.acceptsAll(Arrays.asList("no-warnings", "w"),
                "Disables ALL warnings.");
        OptionSpec<File> inputsOption = parser.nonOptions()
                .ofType(File.class).describedAs("Files to process.");

        OptionSet options = parser.parse(args);

        if (options.has(helpOption)) {
            parser.printHelpOn(System.out);
            return;
        }

        if (options.has(versionOption)) {
            version(System.out);
            return;
        }

        Preprocessor pp = new Preprocessor();
        pp.addFeature(Feature.DIGRAPHS);
        pp.addFeature(Feature.TRIGRAPHS);
        pp.addFeature(Feature.LINEMARKERS);
        pp.addWarning(Warning.IMPORT);
        pp.setListener(new DefaultPreprocessorListener());
        pp.addMacro("__JCPP__");
        pp.getSystemIncludePath().add("/usr/local/include");
        pp.getSystemIncludePath().add("/usr/include");
        pp.getFrameworksPath().add("/System/Library/Frameworks");
        pp.getFrameworksPath().add("/Library/Frameworks");
        pp.getFrameworksPath().add("/Local/Library/Frameworks");

        if (options.has(debugOption))
            pp.addFeature(Feature.DEBUG);

        if (options.has(noWarningOption))
            pp.getWarnings().clear();

        for (String warning : options.valuesOf(warningOption)) {
            warning = warning.toUpperCase();
            warning = warning.replace('-', '_');
            if (warning.equals("ALL"))
                pp.addWarnings(EnumSet.allOf(Warning.class));
            else
                pp.addWarning(Enum.valueOf(Warning.class, warning));
        }

        for (String arg : options.valuesOf(defineOption)) {
            int idx = arg.indexOf('=');
            if (idx == -1)
                pp.addMacro(arg);
            else
                pp.addMacro(arg.substring(0, idx), arg.substring(idx + 1));
        }
        for (String arg : options.valuesOf(undefineOption)) {
            pp.getMacros().remove(arg);
        }

        for (File dir : options.valuesOf(incdirOption))
            pp.getSystemIncludePath().add(dir.getAbsolutePath());
        for (File dir : options.valuesOf(iquoteOption))
            pp.getQuoteIncludePath().add(dir.getAbsolutePath());
        for (File file : options.valuesOf(includeOption))
            // Comply exactly with spec.
            pp.addInput(new StringLexerSource("#" + "include \"" + file + "\"\n"));

        List<File> inputs = options.valuesOf(inputsOption);
        if (inputs.isEmpty()) {
            pp.addInput(new InputLexerSource(System.in));
        } else {
            for (File input : inputs)
                pp.addInput(new FileLexerSource(input));
        }

        if (pp.getFeature(Feature.DEBUG)) {
            LOG.info("#" + "include \"...\" search starts here:");
            for (String dir : pp.getQuoteIncludePath())
                LOG.info("  " + dir);
            LOG.info("#" + "include <...> search starts here:");
            for (String dir : pp.getSystemIncludePath())
                LOG.info("  " + dir);
            LOG.info("End of search list.");
        }

        try {
            for (;;) {
                Token tok = pp.token();
                if (tok == null)
                    break;
                if (tok.getType() == Token.EOF)
                    break;
                System.out.print(tok.getText());
            }
        } catch (Exception e) {
            StringBuilder buf = new StringBuilder("Preprocessor failed:\n");
            Source s = pp.getSource();
            while (s != null) {
                buf.append(" -> ").append(s).append("\n");
                s = s.getParent();
            }
            LOG.error(buf.toString(), e);
        }

    }

    private static void version(@Nonnull PrintStream out) {
        BuildMetadata metadata = BuildMetadata.getInstance();
        out.println("Anarres Java C Preprocessor version " + metadata.getVersion() + " change-id " + metadata.getChangeId());
        out.println("Copyright (C) 2008-2014 Shevek (http://www.anarres.org/).");
        out.println("This is free software; see the source for copying conditions.  There is NO");
        out.println("warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.");
    }
}