r"""Scaffold a Pelican site that writes Mews pages.

Run it straight off the repository, with no checkout and nothing installed:

    uvx --from git+https://code.randogoth.com/randogoth/mews.page.git \\
        mews-quickstart mysite

It writes a project, pins Pelican and the Mews plugin in its pyproject.toml,
installs them, and leaves a first post to edit.
"""

import argparse
from datetime import UTC, datetime
from pathlib import Path
import shutil
import subprocess
import sys

REPO = "git+https://code.randogoth.com/randogoth/mews.page.git"

PYPROJECT = """\
[project]
name = "{slug}"
version = "0.1.0"
description = "A Mews site"
requires-python = ">=3.10"
dependencies = [
    "pelican>=4.9",
    "markdown>=3.4",
    "pelican-mews @ {repo}#subdirectory=pelican-mews",
]
"""

PELICANCONF = """\
AUTHOR = {author!r}
SITENAME = {title!r}
SITEURL = ""
PATH = "content"
TIMEZONE = "UTC"
DEFAULT_LANG = "en"
THEME = "theme"

# The plugin reads the allowed elements and attributes from the Mews DTD and
# brings every page inside that subset.
PLUGINS = ["pelican.plugins.mews"]

# This whole site is Mews, so its pages are plain .html: a server sends those
# as text/html, which section 7.1 asks for so a small markup error still shows
# as a page, and index.html is the directory index everywhere. The plugin
# defaults to .xhtml instead, for sites that are only partly Mews.
MEWS_SUFFIX = ".html"
ARTICLE_URL = ARTICLE_SAVE_AS = "{{slug}}.html"
PAGE_URL = PAGE_SAVE_AS = "{{slug}}.html"

# Markdown has to produce XML for the plugin to parse. Tables and definition
# lists are both in the Mews subset but need their extensions turned on.
MARKDOWN = {{
    "output_format": "xhtml",
    "extension_configs": {{
        "markdown.extensions.tables": {{}},
        "markdown.extensions.def_list": {{}},
    }},
}}

# Every page written under MEWS_SUFFIX goes through the plugin, and Pelican
# falls back to its own HTML templates for these when the theme has none. They
# have nothing to show on a site like this, so they stay off; give them
# templates in theme/templates/ if you want them.
DIRECT_TEMPLATES = ["index"]
AUTHOR_SAVE_AS = CATEGORY_SAVE_AS = TAG_SAVE_AS = ""
AUTHORS_SAVE_AS = CATEGORIES_SAVE_AS = TAGS_SAVE_AS = ARCHIVES_SAVE_AS = ""
# Pelican writes several feeds by default and they are all broken until
# SITEURL is set. Section 6.2 makes an Atom feed optional and the dated links
# on the index are already a subscription, so they start off.
FEED_ALL_ATOM = FEED_ALL_RSS = None
CATEGORY_FEED_ATOM = CATEGORY_FEED_RSS = None
AUTHOR_FEED_ATOM = AUTHOR_FEED_RSS = None
TAG_FEED_ATOM = TAG_FEED_RSS = None
TRANSLATION_FEED_ATOM = TRANSLATION_FEED_RSS = None

# Raise this to stop a build that would strip something, rather than logging
# the removal and carrying on.
MEWS_STRICT = False
"""

BASE = """\
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//WAPFORUM//DTD XHTML Mobile 1.2//EN"
  "http://www.openmobilealliance.org/tech/DTD/xhtml-mobile12.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="{{ DEFAULT_LANG }}" lang="{{ DEFAULT_LANG }}">
  <head>
    <title>{% block title %}{{ SITENAME }}{% endblock %}</title>
{% include "mews/head.html" %}
  </head>
  <body>
{% block content %}{% endblock %}
    <hr />
    <address>{{ SITENAME }}</address>
  </body>
</html>
"""

INDEX = """\
{% extends "base.html" %}
{% block content %}
    <h1>{{ SITENAME }}</h1>
{% if articles %}
    <ul>
{% for article in articles %}
      <li><a href="{{ article.url }}">{{ article.date.strftime("%Y-%m-%d") }} {{ article.title }}</a></li>
{% endfor %}
    </ul>
{% else %}
    <p>Nothing posted yet.</p>
{% endif %}
{% endblock %}
"""

ARTICLE = """\
{% extends "base.html" %}
{% block title %}{{ article.title }}{% endblock %}
{% block content %}
    <h1>{{ article.title }}</h1>
{{ article.content }}
    <p><a href="index.html">All posts</a></p>
{% endblock %}
"""

PAGE = """\
{% extends "base.html" %}
{% block title %}{{ page.title }}{% endblock %}
{% block content %}
    <h1>{{ page.title }}</h1>
{{ page.content }}
    <p><a href="index.html">All posts</a></p>
{% endblock %}
"""

POST = """\
Title: First post
Date: {date}
Slug: first-post

Write here. The plugin keeps whatever fits the Mews subset and strips the
rest, so you can use the ordinary Markdown you already know: *emphasis*,
`code`, [links](https://mews.page/spec/0.1), lists, quotes and tables.

- One
- Two

> Authors provide structure. Readers control presentation.

Delete this file once you have something of your own to say.
"""

README = """\
# {title}

A Mews site. The pages follow [Mews Profile 0.1](https://mews.page/spec/0.1).

## Build it

```shell
uv run pelican content
```

The finished pages land in `output/`, as plain `.html` that any web server
serves correctly with no configuration. To work on it with a reload on save:

```shell
uv run pelican --autoreload --listen content
```

## Publish it

Copy `output/` to any web server. Nothing to configure.

## Subscribe to it

The index lists each post as a dated link, which is all a Mews client needs
(section 6.1). If you also want an Atom feed for ordinary feed readers, set
`SITEURL` in `pelicanconf.py` and put back the `FEED_ALL_ATOM` default.

## Check it

```shell
uvx --from {repo} mewslint https://your.site/
```

Or list your site in the directory at <https://mews.page/check>.
"""


def write(root: Path, files: dict[str, str]) -> None:
    """Write each file, creating the directories it needs."""
    for name, text in files.items():
        path = root / name
        path.parent.mkdir(parents=True, exist_ok=True)
        path.write_text(text, encoding="utf-8")


def scaffold(root: Path, title: str, author: str) -> None:
    """Write a complete Pelican project that produces Mews pages."""
    slug = "".join(c if c.isalnum() else "-" for c in root.name.lower()).strip("-")
    write(
        root,
        {
            "pyproject.toml": PYPROJECT.format(slug=slug or "mews-site", repo=REPO),
            "pelicanconf.py": PELICANCONF.format(title=title, author=author),
            "theme/templates/base.html": BASE,
            "theme/templates/index.html": INDEX,
            "theme/templates/article.html": ARTICLE,
            "theme/templates/page.html": PAGE,
            "content/first-post.md": POST.format(
                date=datetime.now(UTC).strftime("%Y-%m-%d %H:%M")
            ),
            "README.md": README.format(title=title, repo=REPO),
        },
    )


def main(argv: list[str] | None = None) -> int:
    """Create the project, install its dependencies, and say what to run."""
    parser = argparse.ArgumentParser(
        prog="mews-quickstart",
        description="Start a Pelican site that writes Mews pages.",
    )
    parser.add_argument(
        "directory", nargs="?", default="mysite", help="where to put it"
    )
    parser.add_argument("--title", help="site name (default: the directory name)")
    parser.add_argument("--author", default="", help="your name, for the metadata")
    parser.add_argument(
        "--no-install", action="store_true", help="write the files and stop"
    )
    args = parser.parse_args(argv)

    root = Path(args.directory).resolve()
    if root.exists() and any(root.iterdir()):
        print(
            f"{root} already has something in it. Pick an empty directory.",
            file=sys.stderr,
        )
        return 1

    title = args.title or root.name
    scaffold(root, title, args.author)
    print(f"Wrote {root}")

    if not args.no_install:
        uv = shutil.which("uv")
        if uv is None:
            print("uv isn't on the path, so nothing was installed.", file=sys.stderr)
        else:
            print("Installing Pelican and the Mews plugin...")
            result = subprocess.run([uv, "sync"], cwd=root, check=False)
            if result.returncode != 0:
                print(
                    "The install didn't finish. Run `uv sync` yourself to see "
                    "what went wrong.",
                    file=sys.stderr,
                )
                return 1

    print(
        f"\nNext:\n"
        f"  cd {root.name}\n"
        f"  uv run pelican --autoreload --listen content\n\n"
        f"Then open http://localhost:8000/ and edit content/first-post.md."
    )
    return 0


if __name__ == "__main__":
    sys.exit(main())