# Copyright 2015 Google Inc. All Rights Reserved.
#
# 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.


from io import open
import collections
import os
import logging

from glyphsLib.classes import GSFont, __all__ as __all_classes__
from glyphsLib.classes import *  # noqa
from glyphsLib.builder import to_ufos, to_designspace, to_glyphs  # noqa
from glyphsLib.parser import load, loads  # noqa
from glyphsLib.writer import dump, dumps  # noqa
from glyphsLib.util import clean_ufo, ufo_create_background_layer_for_all_glyphs

try:
    from ._version import version as __version__
except ImportError:
    __version__ = "0.0.0+unknown"

__all__ = [
    "build_masters",
    "load_to_ufos",
    "to_ufos",
    "to_designspace",
    "to_glyphs",
    "load",
    "loads",
    "dump",
    "dumps",
] + __all_classes__

logger = logging.getLogger(__name__)

Masters = collections.namedtuple("Masters", ["ufos", "designspace_path"])


def load_to_ufos(
    file_or_path,
    include_instances=False,
    family_name=None,
    propagate_anchors=None,
    ufo_module=None,
    expand_includes=False,
    minimal=False,
    glyph_data=None,
):
    """Load an unpacked .glyphs object to UFO objects."""

    if hasattr(file_or_path, "read"):
        font = load(file_or_path)
    else:
        with open(file_or_path, "r", encoding="utf-8") as ifile:
            font = load(ifile)
    logger.info("Loading to UFOs")
    return to_ufos(
        font,
        include_instances=include_instances,
        family_name=family_name,
        propagate_anchors=propagate_anchors,
        ufo_module=ufo_module,
        expand_includes=expand_includes,
        minimal=minimal,
        glyph_data=glyph_data,
    )


def build_masters(
    filename,
    master_dir,
    designspace_instance_dir=None,
    designspace_path=None,
    family_name=None,
    propagate_anchors=None,
    minimize_glyphs_diffs=False,
    normalize_ufos=False,
    create_background_layers=False,
    generate_GDEF=True,
    store_editor_state=True,
    write_skipexportglyphs=False,
    expand_includes=False,
    ufo_module=None,
    minimal=False,
    glyph_data=None,
):
    """Write and return UFOs from the masters and the designspace defined in a
    .glyphs file.

    Args:
        master_dir: Directory where masters are written.
        designspace_instance_dir: If provided, a designspace document will be
            written alongside the master UFOs though no instances will be built.
        family_name: If provided, the master UFOs will be given this name and
            only instances with this name will be included in the designspace.

    Returns:
        A named tuple of master UFOs (`ufos`) and the path to the designspace
        file (`designspace_path`).
    """

    font = GSFont(filename)

    if not os.path.isdir(master_dir):
        os.mkdir(master_dir)

    if designspace_instance_dir is None:
        instance_dir = None
    else:
        instance_dir = os.path.relpath(designspace_instance_dir, master_dir)

    designspace = to_designspace(
        font,
        family_name=family_name,
        propagate_anchors=propagate_anchors,
        instance_dir=instance_dir,
        minimize_glyphs_diffs=minimize_glyphs_diffs,
        generate_GDEF=generate_GDEF,
        store_editor_state=store_editor_state,
        write_skipexportglyphs=write_skipexportglyphs,
        expand_includes=expand_includes,
        ufo_module=ufo_module,
        minimal=minimal,
        glyph_data=glyph_data,
    )

    # Only write full masters to disk. This assumes that layer sources are always part
    # of another full master source, which must always be the case in a .glyphs file.
    ufos = {}
    for source in designspace.sources:
        if source.filename in ufos:
            assert source.font is ufos[source.filename]
            continue

        if create_background_layers and not minimal:
            ufo_create_background_layer_for_all_glyphs(source.font)

        ufo_path = os.path.join(master_dir, source.filename)
        clean_ufo(ufo_path)
        source.font.save(ufo_path)

        if normalize_ufos:
            import ufonormalizer

            ufonormalizer.normalizeUFO(ufo_path, writeModTimes=False)

        ufos[source.filename] = source.font

    if not designspace_path:
        designspace_path = os.path.join(master_dir, designspace.filename)
    designspace.write(designspace_path)

    return Masters(ufos, designspace_path)
