# MIT License
#
# Copyright The SCons Foundation
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"""Tool specific initialization of msginit tool."""

import sys
import os

import SCons.Action
import SCons.Tool
import SCons.Util
import SCons.Warnings
from SCons.Environment import _null
from SCons.Errors import StopError
from SCons.Platform.cygwin import CYGWIN_DEFAULT_PATHS
from SCons.Platform.mingw import MINGW_DEFAULT_PATHS
from SCons.Tool.GettextCommon import (
    _detect_msginit,
    _init_po_files,
    _msginit_exists,
    # MsginitToolWarning,
    _POFileBuilder,
)


def _optional_no_translator_flag(env):
    """Return '--no-translator' flag if we run *msginit(1)*  in non-interactive
    mode."""
    if 'POAUTOINIT' in env:
        autoinit = env['POAUTOINIT']
    else:
        autoinit = False
    if autoinit:
        return [SCons.Util.CLVar('--no-translator')]
    else:
        return [SCons.Util.CLVar('')]


def _POInitBuilder(env, **kw):
    """ Create builder object for `POInit` builder. """

    action = SCons.Action.Action(_init_po_files, None)
    return _POFileBuilder(env, action=action, target_alias='$POCREATE_ALIAS')


def _POInitBuilderWrapper(env, target=None, source=_null, **kw):
    """Wrapper for _POFileBuilder. We use it to make user's life easier.

    This wrapper checks for `$POTDOMAIN` construction variable (or override in
    `**kw`) and treats it appropriatelly.
    """
    if source is _null:
        if 'POTDOMAIN' in kw:
            domain = kw['POTDOMAIN']
        elif 'POTDOMAIN' in env:
            domain = env['POTDOMAIN']
        else:
            domain = 'messages'
        source = [domain]  # NOTE: Suffix shall be appended automatically
    return env._POInitBuilder(target, source, **kw)

def generate(env, **kw) -> None:
    """ Generate the `msginit` tool """

    if sys.platform == 'win32':
        msginit = SCons.Tool.find_program_path(
            env, 'msginit', default_paths=MINGW_DEFAULT_PATHS + CYGWIN_DEFAULT_PATHS
        )
        if msginit:
            msginit_bin_dir = os.path.dirname(msginit)
            env.AppendENVPath('PATH', msginit_bin_dir)
        else:
            SCons.Warnings.warn(
                # MsginitToolWarning,  # using this breaks test, so keep:
                SCons.Warnings.SConsWarning,
                'msginit tool requested, but binary not found in ENV PATH',
            )

    try:
        env['MSGINIT'] = _detect_msginit(env)
    except StopError:
        env['MSGINIT'] = 'msginit'
    msginitcom = (
        '$MSGINIT ${_MSGNoTranslator(__env__)} -l ${_MSGINITLOCALE}'
        + ' $MSGINITFLAGS -i $SOURCE -o $TARGET'
    )
    # NOTE: We set POTSUFFIX here, in case the 'xgettext' is not loaded
    #       (sometimes we really don't need it)
    env.SetDefault(
        POSUFFIX=['.po'],
        POTSUFFIX=['.pot'],
        _MSGINITLOCALE='${TARGET.filebase}',
        _MSGNoTranslator=_optional_no_translator_flag,
        MSGINITCOM=msginitcom,
        MSGINITCOMSTR='',
        MSGINITFLAGS=[],
        POAUTOINIT=False,
        POCREATE_ALIAS='po-create',
    )
    env.Append(BUILDERS={'_POInitBuilder': _POInitBuilder(env)})
    env.AddMethod(_POInitBuilderWrapper, 'POInit')
    env.AlwaysBuild(env.Alias('$POCREATE_ALIAS'))


def exists(env):
    """ Check if the tool exists """

    try:
        return _msginit_exists(env)
    except StopError:
        return False

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