# paperdoorknob: Print glowfic
#
# 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, version 3.


from dataclasses import dataclass
import itertools

from typing import Iterable

from bs4 import BeautifulSoup
from bs4.element import Tag

from images import ImageStore


@dataclass(frozen=True)
class Chunk:
    icon: str | None
    character: str | None
    screen_name: str | None
    author: str | None
    content: Tag

# We avoid the name "post" because the Glowfic community uses the term
# inconsistently:
#  * The Glowfic software sometimes uses "post" to refer to a whole thread
#    (in the URL), sometimes uses "post" to refer to chunks (in the CSS),
#    but mostly uses "post" to refer to just the first chunk in a thread
#    (in the HTML and UI).  The non-first chunks are "replies".
#  * Readers and this software don't need to distinguish first-chunks and
#    non-first-chunks.
#  * Humans in the community tend to use "posts" to mean chunks.


def chunkDOMs(html: BeautifulSoup) -> Iterable[Tag]:
    def text() -> Tag:
        body = html.body
        assert body
        text = body.find_next("div", class_="post-post")
        assert isinstance(text, Tag)
        return text

    def the_replies() -> Iterable[Tag]:
        rs = html.find_all("div", class_="post-reply")
        assert all(isinstance(r, Tag) for r in rs)
        return rs

    return itertools.chain([text()], the_replies())


def makeChunk(chunk_dom: Tag, image_store: ImageStore) -> Chunk:

    def getIcon() -> str | None:
        icon_div = chunk_dom.find_next('div', class_='post-icon')
        if icon_div is None:
            return None
        icon_img = icon_div.find_next('img')
        if icon_img is None:
            return None
        assert isinstance(icon_img, Tag)
        return image_store.get_image(icon_img.attrs['src'])

    def getTextByClass(css_class: str) -> str | None:
        div = chunk_dom.find_next('div', class_=css_class)
        if div is None:
            return None
        return div.text.strip()

    content = chunk_dom.find_next('div', class_='post-content')
    assert isinstance(content, Tag)

    return Chunk(getIcon(),
                 getTextByClass('post-character'),
                 getTextByClass('post-screenname'),
                 getTextByClass('post-author'),
                 content)