import os, io

from ebook_converter.customize.conversion import (OutputFormatPlugin,
        OptionRecommendation)
from ebook_converter.ptempfile import TemporaryDirectory


__license__ = 'GPL 3'
__copyright__ = '2009, John Schember <john@nachtimwald.com>'
__docformat__ = 'restructuredtext en'


class PMLOutput(OutputFormatPlugin):

    name = 'PML Output'
    author = 'John Schember'
    file_type = 'pmlz'
    commit_name = 'pml_output'

    options = {
        OptionRecommendation(name='pml_output_encoding', recommended_value='cp1252',
            level=OptionRecommendation.LOW,
            help=_('Specify the character encoding of the output document. '
            'The default is cp1252.')),
        OptionRecommendation(name='inline_toc',
            recommended_value=False, level=OptionRecommendation.LOW,
            help=_('Add Table of Contents to beginning of the book.')),
        OptionRecommendation(name='full_image_depth',
            recommended_value=False, level=OptionRecommendation.LOW,
            help=_('Do not reduce the size or bit depth of images. Images '
                   'have their size and depth reduced by default to accommodate '
                   'applications that can not convert images on their '
                   'own such as Dropbook.')),
    }

    def convert(self, oeb_book, output_path, input_plugin, opts, log):
        from ebook_converter.ebooks.pml.pmlml import PMLMLizer
        from ebook_converter.utils.zipfile import ZipFile

        with TemporaryDirectory('_pmlz_output') as tdir:
            pmlmlizer = PMLMLizer(log)
            pml = str(pmlmlizer.extract_content(oeb_book, opts))
            with lopen(os.path.join(tdir, 'index.pml'), 'wb') as out:
                out.write(pml.encode(opts.pml_output_encoding, 'replace'))

            img_path = os.path.join(tdir, 'index_img')
            if not os.path.exists(img_path):
                os.makedirs(img_path)
            self.write_images(oeb_book.manifest, pmlmlizer.image_hrefs, img_path, opts)

            log.debug('Compressing output...')
            pmlz = ZipFile(output_path, 'w')
            pmlz.add_dir(tdir)

    def write_images(self, manifest, image_hrefs, out_dir, opts):
        from PIL import Image

        from ebook_converter.ebooks.oeb.base import OEB_RASTER_IMAGES
        for item in manifest:
            if item.media_type in OEB_RASTER_IMAGES and item.href in image_hrefs.keys():
                if opts.full_image_depth:
                    im = Image.open(io.BytesIO(item.data))
                else:
                    im = Image.open(io.BytesIO(item.data)).convert('P')
                    im.thumbnail((300,300), Image.ANTIALIAS)

                data = io.BytesIO()
                im.save(data, 'PNG')
                data = data.getvalue()

                path = os.path.join(out_dir, image_hrefs[item.href])

                with lopen(path, 'wb') as out:
                    out.write(data)