#
# Copyright (C) 2007, 2009, 2011 Canonical Ltd.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

# This code is from bzr-explorer and modified for bzr.

"""build_mo command for setup.py"""

import os
import re
from distutils import log
from distutils.core import Command
from distutils.dep_util import newer
from distutils.spawn import find_executable
from typing import List, Optional


class build_mo(Command):
    """Subcommand of build command: build_mo"""

    description = "compile po files to mo files"

    # List of options:
    #   - long name,
    #   - short name (None if no short name),
    #   - help string.
    user_options = [
        ("build-dir=", "d", "Directory to build locale files"),
        ("output-base=", "o", "mo-files base name"),
        ("source-dir=", None, "Directory with sources po files"),
        ("force", "f", "Force creation of mo files"),
        ("lang=", None, "Comma-separated list of languages " "to process"),
    ]

    boolean_options = ["force"]
    source_dir: Optional[str]
    build_dir: Optional[str]
    output_base: Optional[str]
    lang: Optional[List[str]]

    def initialize_options(self) -> None:
        self.build_dir = None
        self.output_base = None
        self.source_dir = None  # type: ignore
        self.force = None
        self.lang = None

    def finalize_options(self):
        self.set_undefined_options("build", ("force", "force"))
        self.prj_name = self.distribution.get_name()  # type: ignore
        if self.build_dir is None:
            self.build_dir = "breezy/locale"
        if not self.output_base:
            self.output_base = self.prj_name or "messages"
        if self.source_dir is None:
            self.source_dir = "po"
        if self.lang is None:
            re_po = re.compile(r"^([a-zA-Z_]+)\.po$")
            self.lang = []
            for i in os.listdir(self.source_dir):
                mo = re_po.match(i)
                if mo:
                    self.lang.append(mo.group(1))
        else:
            self.lang = [i.strip() for i in self.lang.split(",") if i.strip()]

    def run(self):
        """Run msgfmt for each language"""
        if not self.lang:
            return

        if find_executable("msgfmt") is None:
            log.warn("GNU gettext msgfmt utility not found!")
            log.warn("Skip compiling po files.")
            return

        if "en" in self.lang:
            if find_executable("msginit") is None:
                log.warn("GNU gettext msginit utility not found!")
                log.warn("Skip creating English PO file.")
            else:
                log.info("Creating English PO file...")
                pot = (self.prj_name or "messages") + ".pot"
                en_po = "en.po"
                self.spawn(
                    [
                        "msginit",
                        "--no-translator",
                        "-l",
                        "en",
                        "-i",
                        os.path.join(self.source_dir, pot),
                        "-o",
                        os.path.join(self.source_dir, en_po),
                    ]
                )

        basename = self.output_base
        if not basename.endswith(".mo"):
            basename += ".mo"

        for lang in self.lang:
            po = os.path.join("po", lang + ".po")
            if not os.path.isfile(po):
                po = os.path.join("po", lang + ".po")
            dir_ = os.path.join(self.build_dir, lang, "LC_MESSAGES")
            self.mkpath(dir_)
            mo = os.path.join(dir_, basename)
            if self.force or newer(po, mo):
                log.info("Compile: {} -> {}".format(po, mo))
                self.spawn(["msgfmt", "-o", mo, po])
