package cn.keking.utils;

import org.jodconverter.core.util.OSUtils;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Properties;
import java.util.stream.Stream;

/**
 * @author chenjh
 * @since 2022-12-15
 */
public class LocalOfficeUtils {

    public static final String OFFICE_HOME_KEY = "office.home";
    public static final String DEFAULT_OFFICE_HOME_VALUE = "default";

    private static final String EXECUTABLE_DEFAULT = "program/soffice.bin";
    private static final String EXECUTABLE_MAC = "program/soffice";
    private static final String EXECUTABLE_MAC_41 = "MacOS/soffice";
    private static final String EXECUTABLE_WINDOWS = "program/soffice.exe";

    public static File getDefaultOfficeHome() {
        Properties properties = new Properties();
        String customizedConfigPath = ConfigUtils.getCustomizedConfigPath();
        try {
            BufferedReader bufferedReader = new BufferedReader(new FileReader(customizedConfigPath));
            properties.load(bufferedReader);
            ConfigUtils.restorePropertiesFromEnvFormat(properties);
        } catch (Exception ignored) {}
        String officeHome = properties.getProperty(OFFICE_HOME_KEY);
        if (officeHome != null && !DEFAULT_OFFICE_HOME_VALUE.equals(officeHome)) {
            return new File(officeHome);
        }
        if (OSUtils.IS_OS_WINDOWS) {
            String userDir = ConfigUtils.getUserDir();
            // Try to find the most recent version of LibreOffice or OpenOffice,
            // starting with the 64-bit version. %ProgramFiles(x86)% on 64-bit
            // machines; %ProgramFiles% on 32-bit ones
            final String programFiles64 = System.getenv("ProgramFiles");
            final String programFiles32 = System.getenv("ProgramFiles(x86)");
            return findOfficeHome(EXECUTABLE_WINDOWS,
                    userDir + File.separator + "LibreOfficePortable" + File.separator  + "App" + File.separator + "libreoffice",
                    programFiles32 + File.separator + "LibreOffice",
                    programFiles64 + File.separator + "LibreOffice 7",
                    programFiles32 + File.separator + "LibreOffice 7",
                    programFiles64 + File.separator + "LibreOffice 6",
                    programFiles32 + File.separator + "LibreOffice 6",
                    programFiles64 + File.separator + "LibreOffice 5",
                    programFiles32 + File.separator + "LibreOffice 5",
                    programFiles64 + File.separator + "LibreOffice 4",
                    programFiles32 + File.separator + "LibreOffice 4",
                    programFiles32 + File.separator + "OpenOffice 4",
                    programFiles64 + File.separator + "LibreOffice 3",
                    programFiles32 + File.separator + "LibreOffice 3",
                    programFiles32 + File.separator + "OpenOffice.org 3");
        } else if (OSUtils.IS_OS_MAC) {
            File homeDir = findOfficeHome(EXECUTABLE_MAC_41,
                            "/Applications/LibreOffice.app/Contents",
                            "/Applications/OpenOffice.app/Contents",
                            "/Applications/OpenOffice.org.app/Contents");

            if (homeDir == null) {
                homeDir = findOfficeHome(EXECUTABLE_MAC,
                                "/Applications/LibreOffice.app/Contents",
                                "/Applications/OpenOffice.app/Contents",
                                "/Applications/OpenOffice.org.app/Contents");
            }
            return homeDir;
        } else {
            // Linux or other *nix variants
            return findOfficeHome(EXECUTABLE_DEFAULT,
                    "/opt/libreoffice6.0",
                    "/opt/libreoffice6.1",
                    "/opt/libreoffice6.2",
                    "/opt/libreoffice6.3",
                    "/opt/libreoffice6.4",
                    "/opt/libreoffice7.0",
                    "/opt/libreoffice7.1",
                    "/opt/libreoffice7.2",
                    "/opt/libreoffice7.3",
                    "/opt/libreoffice7.4",
                    "/opt/libreoffice7.5",
                    "/opt/libreoffice7.6",
                    "/usr/lib64/libreoffice",
                    "/usr/lib/libreoffice",
                    "/usr/local/lib64/libreoffice",
                    "/usr/local/lib/libreoffice",
                    "/opt/libreoffice",
                    "/usr/lib64/openoffice",
                    "/usr/lib64/openoffice.org3",
                    "/usr/lib64/openoffice.org",
                    "/usr/lib/openoffice",
                    "/usr/lib/openoffice.org3",
                    "/usr/lib/openoffice.org",
                    "/opt/openoffice4",
                    "/opt/openoffice.org3");
        }
    }

    private static File findOfficeHome(final String executablePath, final String... homePaths) {
        return Stream.of(homePaths)
                .filter(homePath -> Files.isRegularFile(Paths.get(homePath, executablePath)))
                .findFirst()
                .map(File::new)
                .orElse(null);
    }
}