#  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 copy
import re
from io import BytesIO

from PIL import Image

from rag.nlp import tokenize, is_english
from rag.nlp import rag_tokenizer
from ppt_parser import PptParser

class Ppt(PptParser):
    def __call__(self, fnm, from_page, to_page, callback=None):
        txts = super().__call__(fnm, from_page, to_page)

        callback(0.5, "Text extraction finished.")
        import aspose.slides as slides
        import aspose.pydrawing as drawing
        imgs = []
        with slides.Presentation(BytesIO(fnm)) as presentation:
            for i, slide in enumerate(presentation.slides[from_page: to_page]):
                buffered = BytesIO()
                slide.get_thumbnail(
                    0.5, 0.5).save(
                    buffered, drawing.imaging.ImageFormat.jpeg)
                imgs.append(Image.open(buffered))
        assert len(imgs) == len(
            txts), "Slides text and image do not match: {} vs. {}".format(len(imgs), len(txts))
        callback(0.9, "Image extraction finished")
        self.is_english = is_english(txts)
        return [(txts[i], imgs[i]) for i in range(len(txts))]


def chunk(filename, binary=None, from_page=0, to_page=100000,
          lang="English", callback=None, **kwargs):
    """
    The supported file formats are pptx.
    Every page will be treated as a chunk. And the thumbnail of every page will be stored.
    PPT file will be parsed by using this method automatically, setting-up for every PPT file is not necessary.
    """
    eng = lang.lower() == "english"
    doc = {
        "docnm_kwd": filename,
        "title_tks": rag_tokenizer.tokenize(re.sub(r"\.[a-zA-Z]+$", "", filename))
    }
    doc["title_sm_tks"] = rag_tokenizer.fine_grained_tokenize(doc["title_tks"])
    res = []
    ppt_parser = Ppt()
    for pn, (txt, img) in enumerate(
        ppt_parser(filename if not binary else binary, from_page, 1000000, callback)
    ):
        d = copy.deepcopy(doc)
        pn += from_page
        d["image"] = img
        d["page_num_int"] = [pn + 1]
        d["top_int"] = [0]
        d["position_int"] = [(pn + 1, 0, img.size[0], 0, img.size[1])]
        tokenize(d, txt, eng)
        res.append(d)
    return res

    raise NotImplementedError(
        "file type not supported yet(pptx, pdf supported)")