# MIT License
#
# Copyright The SCons Foundation
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# a copy of this software and associated documentation files (the
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"""Tool specific initialization for `msgmerge` tool."""

import sys
import os

import SCons.Action
import SCons.Tool
import SCons.Warnings
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_msgmerge,
    _init_po_files,
    _msgmerge_exists,
    # MsgmergeToolWarning,
    _POFileBuilder,
)

def _update_or_init_po_files(target, source, env):
    """ Action function for `POUpdate` builder """

    for tgt in target:
        if tgt.rexists():
            action = SCons.Action.Action('$MSGMERGECOM', '$MSGMERGECOMSTR')
        else:
            action = _init_po_files
        status = action([tgt], source, env)
        if status:
            return status
    return 0


def _POUpdateBuilder(env, **kw):
    """ Create an object of `POUpdate` builder """

    action = SCons.Action.Action(_update_or_init_po_files, None)
    return _POFileBuilder(env, action=action, target_alias='$POUPDATE_ALIAS')


from SCons.Environment import _null


def _POUpdateBuilderWrapper(env, target=None, source=_null, **kw):
    """ Wrapper for `POUpdate` builder - make user's life easier """
    if source is _null:
        if 'POTDOMAIN' in kw:
            domain = kw['POTDOMAIN']
        elif 'POTDOMAIN' in env and env['POTDOMAIN']:
            domain = env['POTDOMAIN']
        else:
            domain = 'messages'
        source = [domain]  # NOTE: Suffix shall be appended automatically
    return env._POUpdateBuilder(target, source, **kw)


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

    if sys.platform == 'win32':
        msgmerge = SCons.Tool.find_program_path(
            env, 'msgmerge', default_paths=MINGW_DEFAULT_PATHS + CYGWIN_DEFAULT_PATHS
        )
        if msgmerge:
            msgmerge_bin_dir = os.path.dirname(msgmerge)
            env.AppendENVPath('PATH', msgmerge_bin_dir)
        else:
            SCons.Warnings.warn(
                # MsgmergeToolWarning,  # using this breaks test, so keep:
                SCons.Warnings.SConsWarning,
                'msgmerge tool requested, but binary not found in ENV PATH',
            )
    try:
        env['MSGMERGE'] = _detect_msgmerge(env)
    except StopError:
        env['MSGMERGE'] = 'msgmerge'
    env.SetDefault(
        POTSUFFIX=['.pot'],
        POSUFFIX=['.po'],
        MSGMERGECOM='$MSGMERGE  $MSGMERGEFLAGS --update $TARGET $SOURCE',
        MSGMERGECOMSTR='',
        MSGMERGEFLAGS=[],
        POUPDATE_ALIAS='po-update',
    )
    env.Append(BUILDERS={'_POUpdateBuilder': _POUpdateBuilder(env)})
    env.AddMethod(_POUpdateBuilderWrapper, 'POUpdate')
    env.AlwaysBuild(env.Alias('$POUPDATE_ALIAS'))


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

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

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