import ctypes
import gettext
import locale
import logging
import os
import sys

from .. import PluginBase


LOGGER = logging.getLogger(__name__)


class Plugin(PluginBase):
    def __init__(self):
        super().__init__()
        self.libintl = None

    def get_interfaces(self):
        return [
            'l10n',
            'l10n_init',
        ]

    def get_deps(self):
        return [
            {
                # if frozen, we need sys._MEIPASS to be set correctly
                'interface': 'frozen',
                'defaults': ['openpaperwork_core.frozen'],
            },
            {
                'interface': 'fs',
                'defaults': ['openpaperwork_core.fs.python'],
            },
            {
                'interface': 'resources',
                'defaults': ['openpaperwork_core.resources.setuptools'],
            },
        ]

    def init(self, core):
        super().init(core)

        if os.name == "nt" and os.getenv('LANG') is None:
            (lang, enc) = locale.getdefaultlocale()
            os.environ['LANG'] = lang

        try:
            locale.setlocale(locale.LC_ALL, '')
        except locale.Error:
            # happens, for instance when LC_ALL is set to a nonexisting locale
            LOGGER.warning(
                "Failed to set localization. Localization will be disabled"
            )
            return

        self.libintl = None
        if getattr(sys, 'frozen', False):
            libintl_path = os.path.abspath(os.path.join(
                sys._MEIPASS, "libintl-8.dll"
            ))
            self.libintl = ctypes.cdll.LoadLibrary(libintl_path)

        self.l10n_load('openpaperwork_core.l10n', 'openpaperwork_core')

    def l10n_load(self, python_package, text_domain):
        path = self.core.call_success(
            "resources_get_dir", python_package, 'out'
        )
        assert(path is not None)
        path = self.core.call_success("fs_unsafe", path)

        mo_file = gettext.find(text_domain, path)
        if mo_file is None:
            # expected if we don't have translation for the user language
            LOGGER.info(
                "Failed to find valid locale for '%s' (path=%s)",
                text_domain, path
            )
            # we still try to keep going

        LOGGER.info("Binding text domain %s to '%s'", text_domain, path)

        if self.libintl is not None:
            self.libintl.bindtextdomain(text_domain, path)
            self.libintl.bind_textdomain_codeset(text_domain, 'UTF-8')

        for module in (gettext, locale):
            if hasattr(module, 'bindtextdomain'):
                module.bindtextdomain(text_domain, path)
            if hasattr(module, 'textdomain'):
                module.textdomain(text_domain)
