# Copyright (C) 2012-2013 Aleksey Lim
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from cStringIO import StringIO
from os.path import join

from sugar_network import db, model, static
from sugar_network.toolkit.router import Blob, ACL


class Context(db.Resource):

    @db.indexed_property(prefix='T', full_text=True,
            typecast=[model.CONTEXT_TYPES])
    def type(self, value):
        return value

    @type.setter
    def type(self, value):
        if value and 'package' in value and 'common' not in self['layer']:
            self['layer'] = tuple(self['layer']) + ('common',)
        return value

    @db.indexed_property(slot=1, prefix='S', full_text=True, localized=True)
    def title(self, value):
        return value

    @db.indexed_property(prefix='R', full_text=True, localized=True)
    def summary(self, value):
        return value

    @db.indexed_property(prefix='D', full_text=True, localized=True)
    def description(self, value):
        return value

    @db.indexed_property(prefix='H', default='', full_text=True)
    def homepage(self, value):
        return value

    @db.indexed_property(prefix='Y', default=[], typecast=[], full_text=True)
    def mime_types(self, value):
        return value

    @db.blob_property(mime_type='image/png')
    def icon(self, value):
        if value:
            return value
        if 'package' in self['type']:
            return Blob({
                'url': '/static/images/package.png',
                'blob': join(static.PATH, 'images', 'package.png'),
                'mime_type': 'image/png',
                })
        else:
            return Blob({
                'url': '/static/images/missing.png',
                'blob': join(static.PATH, 'images', 'missing.png'),
                'mime_type': 'image/png',
                })

    @db.blob_property(mime_type='image/svg+xml')
    def artifact_icon(self, value):
        if value:
            return value
        return Blob({
            'url': '/static/images/missing.svg',
            'blob': join(static.PATH, 'images', 'missing.svg'),
            'mime_type': 'image/svg+xml',
            })

    @db.blob_property(mime_type='image/png')
    def preview(self, value):
        if value:
            return value
        return Blob({
            'url': '/static/images/missing.png',
            'blob': join(static.PATH, 'images', 'missing.png'),
            'mime_type': 'image/png',
            })

    @db.indexed_property(slot=3, typecast=model.RATINGS, default=0,
            acl=ACL.READ | ACL.CALC)
    def rating(self, value):
        return value

    @db.stored_property(typecast=[], default=[0, 0], acl=ACL.READ | ACL.CALC)
    def reviews(self, value):
        if value is None:
            return 0
        else:
            return value[0]

    @reviews.setter
    def reviews(self, value):
        if isinstance(value, int):
            return [value, 0]
        else:
            return value

    @db.stored_property(typecast=[], default=[], acl=ACL.PUBLIC | ACL.LOCAL)
    def dependencies(self, value):
        """Software dependencies.

        This is a transition method how to improve dependencies handling.
        The regular way should be setting up them in activity.info instead.

        """
        return value

    @db.stored_property(typecast=dict, default={},
            acl=ACL.PUBLIC | ACL.LOCAL)
    def aliases(self, value):
        return value

    @db.stored_property(typecast=dict, default={}, acl=ACL.PUBLIC | ACL.LOCAL)
    def packages(self, value):
        return value

    @staticmethod
    def image_props(svg):
        icon = StringIO(svg.read())
        return {'artifact_icon': {
                    'blob': icon,
                    'mime_type': 'image/svg+xml',
                    },
                'icon': {
                    'blob': _svg_to_png(icon.getvalue(), 55, 55),
                    'mime_type': 'image/png',
                    },
                'preview': {
                    'blob': _svg_to_png(icon.getvalue(), 160, 120),
                    'mime_type': 'image/png',
                    },
                }


def _svg_to_png(data, w, h):
    import rsvg
    import cairo

    svg = rsvg.Handle(data=data)
    surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, w, h)
    context = cairo.Context(surface)

    scale = min(float(w) / svg.props.width, float(h) / svg.props.height)
    context.translate(
            int(w - svg.props.width * scale) / 2,
            int(h - svg.props.height * scale) / 2)
    context.scale(scale, scale)
    svg.render_cairo(context)

    result = StringIO()
    surface.write_to_png(result)
    result.seek(0)
    return result