# Copyright 2016 The Meson development team

# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at

#     http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import shutil

from os import path
from .. import coredata, mesonlib, build, mlog
from ..mesonlib import MesonException
from ..scripts.gettext import read_linguas
from . import ModuleReturnValue
from . import ExtensionModule
from ..interpreterbase import permittedKwargs, FeatureNew, FeatureNewKwargs

PRESET_ARGS = {
    'glib': [
        '--from-code=UTF-8',
        '--add-comments',

        # https://developer.gnome.org/glib/stable/glib-I18N.html
        '--keyword=_',
        '--keyword=N_',
        '--keyword=C_:1c,2',
        '--keyword=NC_:1c,2',
        '--keyword=g_dcgettext:2',
        '--keyword=g_dngettext:2,3',
        '--keyword=g_dpgettext2:2c,3',

        '--flag=N_:1:pass-c-format',
        '--flag=C_:2:pass-c-format',
        '--flag=NC_:2:pass-c-format',
        '--flag=g_dngettext:2:pass-c-format',
        '--flag=g_strdup_printf:1:c-format',
        '--flag=g_string_printf:2:c-format',
        '--flag=g_string_append_printf:2:c-format',
        '--flag=g_error_new:3:c-format',
        '--flag=g_set_error:4:c-format',
        '--flag=g_markup_printf_escaped:1:c-format',
        '--flag=g_log:3:c-format',
        '--flag=g_print:1:c-format',
        '--flag=g_printerr:1:c-format',
        '--flag=g_printf:1:c-format',
        '--flag=g_fprintf:2:c-format',
        '--flag=g_sprintf:2:c-format',
        '--flag=g_snprintf:3:c-format',
    ]
}


class I18nModule(ExtensionModule):
    def __init__(self, interpreter):
        super().__init__(interpreter)
        self.methods.update({
            'merge_file': self.merge_file,
            'gettext': self.gettext,
        })

    @staticmethod
    def nogettext_warning():
        mlog.warning('Gettext not found, all translation targets will be ignored.', once=True)

    @staticmethod
    def _get_data_dirs(state, dirs):
        """Returns source directories of relative paths"""
        src_dir = path.join(state.environment.get_source_dir(), state.subdir)
        return [path.join(src_dir, d) for d in dirs]

    @FeatureNew('i18n.merge_file', '0.37.0')
    @FeatureNewKwargs('i18n.merge_file', '0.51.0', ['args'])
    @permittedKwargs(build.CustomTarget.known_kwargs | {'data_dirs', 'po_dir', 'type', 'args'})
    def merge_file(self, state, args, kwargs):
        if not shutil.which('xgettext'):
            self.nogettext_warning()
            return
        podir = kwargs.pop('po_dir', None)
        if not podir:
            raise MesonException('i18n: po_dir is a required kwarg')
        podir = path.join(state.build_to_src, state.subdir, podir)

        file_type = kwargs.pop('type', 'xml')
        VALID_TYPES = ('xml', 'desktop')
        if file_type not in VALID_TYPES:
            raise MesonException(f'i18n: "{file_type}" is not a valid type {VALID_TYPES}')

        datadirs = self._get_data_dirs(state, mesonlib.stringlistify(kwargs.pop('data_dirs', [])))
        datadirs = '--datadirs=' + ':'.join(datadirs) if datadirs else None

        command = state.environment.get_build_command() + [
            '--internal', 'msgfmthelper',
            '@INPUT@', '@OUTPUT@', file_type, podir
        ]
        if datadirs:
            command.append(datadirs)

        if 'args' in kwargs:
            command.append('--')
            command.append(mesonlib.stringlistify(kwargs.pop('args', [])))

        kwargs['command'] = command

        # We only use this input file to create a name of the custom target.
        # Thus we can ignore the other entries.
        inputfile = mesonlib.extract_as_list(kwargs, 'input')[0]
        if isinstance(inputfile, str):
            inputfile = mesonlib.File.from_source_file(state.environment.source_dir,
                                                       state.subdir, inputfile)
        if isinstance(inputfile, mesonlib.File):
            # output could be '@BASENAME@' in which case we need to do substitutions
            # to get a unique target name.
            output = kwargs['output']
            ifile_abs = inputfile.absolute_path(state.environment.source_dir,
                                                state.environment.build_dir)
            values = mesonlib.get_filenames_templates_dict([ifile_abs], None)
            outputs = mesonlib.substitute_values([output], values)
            output = outputs[0]
            ct = build.CustomTarget(output + '_' + state.subdir.replace('/', '@').replace('\\', '@') + '_merge', state.subdir, state.subproject, kwargs)
        else:
            ct = build.CustomTarget(kwargs['output'] + '_merge', state.subdir, state.subproject, kwargs)

        return ModuleReturnValue(ct, [ct])

    @FeatureNewKwargs('i18n.gettext', '0.37.0', ['preset'])
    @FeatureNewKwargs('i18n.gettext', '0.50.0', ['install_dir'])
    @permittedKwargs({'po_dir', 'data_dirs', 'type', 'languages', 'args', 'preset', 'install', 'install_dir'})
    def gettext(self, state, args, kwargs):
        if len(args) != 1:
            raise coredata.MesonException('Gettext requires one positional argument (package name).')
        if not shutil.which('xgettext'):
            self.nogettext_warning()
            return
        packagename = args[0]
        languages = mesonlib.stringlistify(kwargs.get('languages', []))
        datadirs = self._get_data_dirs(state, mesonlib.stringlistify(kwargs.get('data_dirs', [])))
        extra_args = mesonlib.stringlistify(kwargs.get('args', []))
        targets = []

        preset = kwargs.pop('preset', None)
        if preset:
            preset_args = PRESET_ARGS.get(preset)
            if not preset_args:
                raise coredata.MesonException('i18n: Preset "{}" is not one of the valid options: {}'.format(
                                              preset, list(PRESET_ARGS.keys())))
            extra_args = set(preset_args + extra_args)

        pkg_arg = '--pkgname=' + packagename
        lang_arg = '--langs=' + '@@'.join(languages) if languages else None
        datadirs = '--datadirs=' + ':'.join(datadirs) if datadirs else None
        extra_args = '--extra-args=' + '@@'.join(extra_args) if extra_args else None

        potargs = state.environment.get_build_command() + ['--internal', 'gettext', 'pot', pkg_arg]
        if datadirs:
            potargs.append(datadirs)
        if extra_args:
            potargs.append(extra_args)
        pottarget = build.RunTarget(packagename + '-pot', potargs, [], state.subdir, state.subproject)
        targets.append(pottarget)

        install = kwargs.get('install', True)
        install_dir = kwargs.get('install_dir', state.environment.coredata.get_option(mesonlib.OptionKey('localedir')))
        if not languages:
            languages = read_linguas(path.join(state.environment.source_dir, state.subdir))
        for l in languages:
            po_file = mesonlib.File.from_source_file(state.environment.source_dir,
                                                     state.subdir, l+'.po')
            gmo_kwargs = {'command': ['msgfmt', '@INPUT@', '-o', '@OUTPUT@'],
                          'input': po_file,
                          'output': packagename+'.mo',
                          'install': install,
                          # We have multiple files all installed as packagename+'.mo' in different install subdirs.
                          # What we really wanted to do, probably, is have a rename: kwarg, but that's not available
                          # to custom_targets. Crude hack: set the build target's subdir manually.
                          # Bonus: the build tree has something usable as an uninstalled bindtextdomain() target dir.
                          'install_dir': path.join(install_dir, l, 'LC_MESSAGES'),
                          'install_tag': 'i18n',
                          }
            gmotarget = build.CustomTarget(l+'.mo', path.join(state.subdir, l, 'LC_MESSAGES'), state.subproject, gmo_kwargs)
            targets.append(gmotarget)

        updatepoargs = state.environment.get_build_command() + ['--internal', 'gettext', 'update_po', pkg_arg]
        if lang_arg:
            updatepoargs.append(lang_arg)
        if datadirs:
            updatepoargs.append(datadirs)
        if extra_args:
            updatepoargs.append(extra_args)
        updatepotarget = build.RunTarget(packagename + '-update-po', updatepoargs, [], state.subdir, state.subproject)
        targets.append(updatepotarget)

        return ModuleReturnValue(None, targets)

def initialize(*args, **kwargs):
    return I18nModule(*args, **kwargs)