package org.unicode.cldr.tool;

import static org.unicode.cldr.util.PathUtilities.getNormalizedPathString;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;

import org.unicode.cldr.draft.FileUtilities;
import org.unicode.cldr.util.CLDRPaths;
import org.unicode.cldr.util.CldrUtility;
import org.unicode.cldr.util.CldrUtility.LineComparer;
import org.unicode.cldr.util.FileReaders;
import org.unicode.cldr.util.PathUtilities;

/**
 * Utilities for CLDR tools.
 * Not used in Survey Tool.
 * Moved here from CldrUtilities
 * @author srl
 *
 */
public class ToolUtilities {

    public static void registerExtraTransliterators() {
        // NOTE: UTIL_DATA_DIR is required here only because TransliteratorUtilities
        // requires a file path.
//        String tzadir = CLDRPaths.UTIL_DATA_DIR + File.separatorChar; // work around bad pattern (dir+filename)
//        // HACK around lack of Armenian, Ethiopic
//        TransliteratorUtilities.registerTransliteratorFromFile(tzadir, "Latin-Armenian");
//        // TransliteratorUtilities.registerTransliteratorFromFile(tzadir, "Latin-Ethiopic");
//        TransliteratorUtilities.registerTransliteratorFromFile(tzadir, "Cyrillic-Latin");
//        TransliteratorUtilities.registerTransliteratorFromFile(tzadir, "Arabic-Latin");
//        // needed
//        TransliteratorUtilities.registerTransliteratorFromFile(tzadir, "Thaana-Latin");
//        TransliteratorUtilities.registerTransliteratorFromFile(tzadir, "Syriac-Latin");
//        TransliteratorUtilities.registerTransliteratorFromFile(tzadir, "Canadian_Aboriginal-Latin");
//        TransliteratorUtilities.registerTransliteratorFromFile(tzadir, "Georgian-Latin");
//
//        // do nothing, too complicated to do quickly
//        TransliteratorUtilities.registerTransliteratorFromFile(tzadir, "Tibetan-Latin"); // needed
//        TransliteratorUtilities.registerTransliteratorFromFile(tzadir, "Khmer-Latin"); // needed
//        TransliteratorUtilities.registerTransliteratorFromFile(tzadir, "Lao-Latin");
    }

    static public void generateBat(String sourceDir, String sourceFile, String targetDir, String targetFile) {
        generateBat(sourceDir, sourceFile, targetDir, targetFile, new CldrUtility.SimpleLineComparator(0));
    }

    static public void generateBat(String sourceDir, String sourceFile, String targetDir, String targetFile,
        LineComparer lineComparer) {
        try {
            String batDir = targetDir + "diff" + File.separator;
            String batName = targetFile + ".bat";
            String[] failureLines = new String[2];

            String fullSource = sourceDir + File.separator + sourceFile;
            String fullTarget = targetDir + File.separator + targetFile;

            if (!new File(sourceDir, sourceFile).exists()) {
                File f = new File(batDir, batName);
                if (f.exists()) {
                    if (DEBUG_SHOW_BAT) System.out.println("*Deleting old " + getNormalizedPathString(f));
                    f.delete();
                }
            } else if (!CldrUtility.areFileIdentical(fullSource, fullTarget, failureLines, lineComparer)) {
                PrintWriter bat = FileUtilities.openUTF8Writer(batDir, batName);
                try {
                    bat.println(CLDRPaths.COMPARE_PROGRAM + " " +
                            getNormalizedPathString(fullSource) + " " + getNormalizedPathString(fullTarget));
                } finally {
                    bat.close();
                }
            } else {
                File f = new File(batDir, batName);
                if (f.exists()) {
                    if (DEBUG_SHOW_BAT) System.out.println("*Deleting old:\t" + getNormalizedPathString(f));
                    f.delete();
                }
                f = new File(fullTarget);
                if (FileUtilities.SHOW_FILES) System.out.println("*Deleting old:\t" + getNormalizedPathString(f));
                f.delete();
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    /**
     * Fetch data from jar
     *
     * @param name
     *            a name residing in the org/unicode/cldr/tool/ directory, or loading from a jar will break.
     */
    public static BufferedReader getUTF8Data(String name) {
        if (new File(name).isAbsolute()) {
            throw new IllegalArgumentException(
                "Path must be relative to org/unicode/cldr/tool  such as 'file.txt' or 'casing/file.txt', but got '"
                    + name + "'.");
        }

        return FileReaders.openFile(ToolUtilities.class, name);
    }

    static final boolean DEBUG_SHOW_BAT = false;

}