#!/usr/bin/env python3

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# ***************************************************************************/

from os.path import join, dirname

import errno
import os
import os.path
import sys
import shutil

from zenmapCore.BasePaths import base_paths
from zenmapCore.Name import APP_NAME


prefix = join(dirname(__file__), 'data')

CONFIG_DIR = join(prefix, "config")
LOCALE_DIR = join(prefix, "locale")
MISC_DIR = join(prefix, "misc")
PIXMAPS_DIR = join(prefix, "pixmaps")
DOCS_DIR = join(prefix, "docs")


def get_extra_executable_search_paths():
    """Return a list of additional executable search paths as a convenience for
    platforms where the default PATH is inadequate."""
    if sys.platform == 'darwin':
        return ["/usr/local/bin"]
    elif sys.platform == 'win32':
        return [dirname(sys.executable)]
    return []


#######
# Paths
class Paths(object):
    """Paths
    """
    hardcoded = ["config_dir",
                 "locale_dir",
                 "pixmaps_dir",
                 "misc_dir",
                 "docs_dir"]

    config_files_list = ["config_file",
                         "scan_profile",
                         ]

    empty_config_files_list = ["target_list",
                               "recent_scans",
                               "db"]

    misc_files_list = ["options",
                       "profile_editor"]

    def __init__(self):
        self.config_dir = CONFIG_DIR
        self.locale_dir = LOCALE_DIR
        self.pixmaps_dir = PIXMAPS_DIR
        self.misc_dir = MISC_DIR
        self.docs_dir = DOCS_DIR
        self._delayed_incomplete = True
        PATH = os.environ.get('PATH', os.defpath)
        extra = get_extra_executable_search_paths()
        if extra:
            PATH += ';' + ';'.join(extra)
        NMAPPATH = dirname(shutil.which("nmap", path=PATH))
        if sys.platform == 'win32':
            self.nmap_dir = NMAPPATH
        else:
            self.nmap_dir = join(NMAPPATH, "..", "share", "nmap")

    # Delay initializing these paths so that
    # zenmapCore.I18N.install_gettext can install _() before modules that
    # need it get imported
    def _delayed_init(self):
        if self._delayed_incomplete:
            from zenmapCore.UmitOptionParser import option_parser
            self.user_config_dir = option_parser.get_confdir()
            self.user_config_file = os.path.join(
                    self.user_config_dir, base_paths['user_config_file'])
            self._delayed_incomplete = False

    def __getattr__(self, name):
        if name in self.hardcoded:
            return self.__dict__[name]

        self._delayed_init()
        if name in self.config_files_list:
            return return_if_exists(
                    join(self.user_config_dir, base_paths[name]))

        if name in self.empty_config_files_list:
            return return_if_exists(
                    join(self.user_config_dir, base_paths[name]), True)

        if name in self.misc_files_list:
            return return_if_exists(join(self.misc_dir, base_paths[name]))

        try:
            return self.__dict__[name]
        except Exception:
            raise NameError(name)

    def __setattr__(self, name, value):
        self.__dict__[name] = value


def create_dir(path):
    """Create a directory with os.makedirs without raising an error if the
    directory already exists."""
    try:
        os.makedirs(path)
    except OSError as e:
        if e.errno != errno.EEXIST:
            raise


def create_user_config_dir(user_dir, template_dir):
    """Create a user configuration directory by creating the directory if
    necessary, then copying all the files from the given template directory,
    skipping any that already exist."""
    from zenmapCore.UmitLogging import log
    log.debug(">>> Create user dir at %s" % user_dir)
    create_dir(user_dir)

    for filename in os.listdir(template_dir):
        template_filename = os.path.join(template_dir, filename)
        user_filename = os.path.join(user_dir, filename)
        # Only copy regular files.
        if not os.path.isfile(template_filename):
            continue
        # Don't overwrite existing files.
        if os.path.exists(user_filename):
            log.debug(">>> %s already exists." % user_filename)
            continue
        shutil.copyfile(template_filename, user_filename)
        log.debug(">>> Copy %s to %s." % (template_filename, user_filename))


def return_if_exists(path, create=False):
    path = os.path.abspath(path)
    if os.path.exists(path):
        return path
    elif create:
        f = open(path, "wb")
        f.close()
        return path
    raise Exception("File '%s' does not exist or could not be found!" % path)

############
# Singleton!
Path = Paths()

if __name__ == '__main__':
    print(">>> SAVED DIRECTORIES:")
    print(">>> LOCALE DIR:", Path.locale_dir)
    print(">>> PIXMAPS DIR:", Path.pixmaps_dir)
    print(">>> CONFIG DIR:", Path.config_dir)
    print()
    print(">>> FILES:")
    print(">>> USER CONFIG FILE:", Path.user_config_file)
    print(">>> CONFIG FILE:", Path.user_config_file)
    print(">>> TARGET_LIST:", Path.target_list)
    print(">>> PROFILE_EDITOR:", Path.profile_editor)
    print(">>> SCAN_PROFILE:", Path.scan_profile)
    print(">>> RECENT_SCANS:", Path.recent_scans)
    print(">>> OPTIONS:", Path.options)
    print()
    print(">>> DB:", Path.db)
