# 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.

import logging

from glyphsLib import classes
import defcon

from .builders import UFOBuilder, GlyphsBuilder

logger = logging.getLogger(__name__)


def to_ufos(
    font,
    include_instances=False,
    family_name=None,
    propagate_anchors=True,
    ufo_module=defcon,
    minimize_glyphs_diffs=False,
    generate_GDEF=True,
    store_editor_state=True,
    write_skipexportglyphs=False,
):
    """Take a GSFont object and convert it into one UFO per master.

    Takes in data as Glyphs.app-compatible classes, as documented at
    https://docu.glyphsapp.com/

    If include_instances is True, also returns the parsed instance data.

    If family_name is provided, the master UFOs will be given this name and
    only instances with this name will be returned.

    If generate_GDEF is True, write a `table GDEF {...}` statement in the
    UFO's features.fea, containing GlyphClassDef and LigatureCaretByPos.
    """
    builder = UFOBuilder(
        font,
        ufo_module=ufo_module,
        family_name=family_name,
        propagate_anchors=propagate_anchors,
        minimize_glyphs_diffs=minimize_glyphs_diffs,
        generate_GDEF=generate_GDEF,
        store_editor_state=store_editor_state,
        write_skipexportglyphs=write_skipexportglyphs,
    )

    result = list(builder.masters)

    if include_instances:
        return result, builder.instance_data
    return result


def to_designspace(
    font,
    family_name=None,
    instance_dir=None,
    propagate_anchors=True,
    ufo_module=defcon,
    minimize_glyphs_diffs=False,
    generate_GDEF=True,
    store_editor_state=True,
    write_skipexportglyphs=False,
):
    """Take a GSFont object and convert it into a Designspace Document + UFOS.
    The UFOs are available as the attribute `font` of each SourceDescriptor of
    the DesignspaceDocument:

        ufos = [source.font for source in designspace.sources]

    The designspace and the UFOs are not written anywhere by default, they
    are all in-memory. If you want to write them to the disk, consider using
    the `filename` attribute of the DesignspaceDocument and of its
    SourceDescriptor as possible file names.

    Takes in data as Glyphs.app-compatible classes, as documented at
    https://docu.glyphsapp.com/

    If include_instances is True, also returns the parsed instance data.

    If family_name is provided, the master UFOs will be given this name and
    only instances with this name will be returned.

    If generate_GDEF is True, write a `table GDEF {...}` statement in the
    UFO's features.fea, containing GlyphClassDef and LigatureCaretByPos.
    """
    builder = UFOBuilder(
        font,
        ufo_module=ufo_module,
        family_name=family_name,
        instance_dir=instance_dir,
        propagate_anchors=propagate_anchors,
        use_designspace=True,
        minimize_glyphs_diffs=minimize_glyphs_diffs,
        generate_GDEF=generate_GDEF,
        store_editor_state=store_editor_state,
        write_skipexportglyphs=write_skipexportglyphs,
    )
    return builder.designspace


def to_glyphs(ufos_or_designspace, glyphs_module=classes, minimize_ufo_diffs=False):
    """
    Take a list of UFOs or a single DesignspaceDocument with attached UFOs
    and converts it into a GSFont object.

    The GSFont object is in-memory, it's up to the user to write it to the disk
    if needed.

    This should be the inverse function of `to_ufos` and `to_designspace`,
    so we should have to_glyphs(to_ufos(font)) == font
    and also to_glyphs(to_designspace(font)) == font
    """
    if hasattr(ufos_or_designspace, "sources"):
        builder = GlyphsBuilder(
            designspace=ufos_or_designspace,
            glyphs_module=glyphs_module,
            minimize_ufo_diffs=minimize_ufo_diffs,
        )
    else:
        builder = GlyphsBuilder(
            ufos=ufos_or_designspace,
            glyphs_module=glyphs_module,
            minimize_ufo_diffs=minimize_ufo_diffs,
        )
    return builder.font
