import dataclasses
import errno
import re
import stat
from collections.abc import Iterator
from logging import getLogger

import marko
import marko.md_renderer

from .favro_data_model import Card, SeqId

@dataclasses.dataclass(frozen=True)
class CardContents:
    name: str
    description: str

markdown = marko.Markdown()
renderer = marko.md_renderer.MarkdownRenderer()

def format_card_contents(card: CardContents) -> str:
    ls = []
    if card.name:
        ls.append('# ')
        ls.append(card.name)
    ls.append('\n\n')
    ls.append(card.description or '')
    return ''.join(ls)

def parse_card_contents(contents: str) -> CardContents:
    document = markdown.parse(contents.strip())
    name = None
    for elem in document.children:
        if isinstance(elem, marko.block.Heading):
            name = renderer.render_children(elem)
            document.children.remove(elem)
            break

    return CardContents(
            name,
            renderer.render_children(document).strip(),
    )

def format_card(card: Card) -> str:
    return format_card_contents(CardContents(card.name, card.detailed_description))