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

import frontmatter
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()

OBSIDIAN_MODE = True

def format_card_contents(card: CardContents) -> str:
    ls = []

    # Frontmatter
    if OBSIDIAN_MODE:
        if card.name:
            ls.append('---\n')
            # TODO: Tags
            ls.append('aliases:\n')
            ls.append('  - ')
            ls.append(card.name)
            ls.append('\n')
            ls.append('---\n\n')

    # Card name
    if card.name:
        ls.append('# ')
        ls.append(card.name)
        ls.append('\n\n')

    # Card contents
    if card.description:
        ls.append(card.description)
    return ''.join(ls)

def parse_card_contents(contents: str) -> CardContents:
    """
    1. Strips frontmatter
    2. Parses header
    3. Finds content.
    """
    fm = frontmatter.loads(contents)
    del contents

    document = markdown.parse(fm.content.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))