# retoor <retoor@molodetz.nl>
import re
from functools import lru_cache

import mistune
from mistune.renderers.html import HTMLRenderer

from molodetz import config
from molodetz.rendering import normalize_dashes

PROSE_DIR = config.TEMPLATES_DIR / "docs" / "prose"

SECTIONS = ("Begin hier", "Bouwen met de API", "Bijdragen en internals", "Beheer")

COMPONENTS = ("avatar", "code", "content", "title", "toast", "dialog", "context-menu", "upload", "lightbox", "chat")

DOCS_PAGES = [
    {"slug": "welkom", "title": "Welkom", "section": "Begin hier", "file": "welkom.md"},
    {"slug": "schrijven", "title": "Schrijven op de rol", "section": "Begin hier", "file": "schrijven.md"},
    {"slug": "binnen", "title": "Binnenkomen", "section": "Begin hier", "file": "binnen.md"},
    {"slug": "juridisch", "title": "Voorwaarden en privacy", "section": "Begin hier", "file": "juridisch.md"},
    {"slug": "api", "title": "API en authenticatie", "section": "Bouwen met de API", "file": "api.md"},
    {"slug": "architectuur", "title": "Architectuur", "section": "Bijdragen en internals", "file": "architectuur.md"},
    {"slug": "frontend", "title": "Frontend en componenten", "section": "Bijdragen en internals", "file": "frontend.md"},
    {"slug": "beheer", "title": "Beheer en services", "section": "Beheer", "file": "beheer.md", "admin": True},
    {"slug": "backups", "title": "Back-ups en onderhoud", "section": "Beheer", "file": "backups.md", "admin": True},
] + [
    {
        "slug": f"component-{name}",
        "title": f"dp-{name}",
        "section": "Bijdragen en internals",
        "file": f"component-{name}.md",
    }
    for name in COMPONENTS
]


class ProseRenderer(HTMLRenderer):
    def heading(self, text, level, **attrs):
        anchor = re.sub(r"[^a-z0-9-]", "-", re.sub(r"<[^>]+>", "", text).lower())
        anchor = re.sub(r"-+", "-", anchor).strip("-")
        return f'<h{level} id="{anchor}"><a class="permalink" href="#{anchor}">{text}</a></h{level}>\n'


_prose_markdown = mistune.create_markdown(escape=False, hard_wrap=True, renderer=ProseRenderer(escape=False), plugins=["table", "strikethrough", "url"])


def visible_pages(viewer_is_admin):
    return [page for page in DOCS_PAGES if viewer_is_admin or not page.get("admin")]


def page_by_slug(slug):
    for page in DOCS_PAGES:
        if page["slug"] == slug:
            return page
    return None


@lru_cache(maxsize=64)
def page_source(slug):
    page = page_by_slug(slug)
    if page is None:
        return ""
    return normalize_dashes((PROSE_DIR / page["file"]).read_text(encoding="utf-8"))


@lru_cache(maxsize=64)
def render_page(slug):
    return _prose_markdown(page_source(slug))


def sidebar(viewer_is_admin):
    pages = visible_pages(viewer_is_admin)
    return [(section, [page for page in pages if page["section"] == section]) for section in SECTIONS]