"""Shared helpers: build a tiny Pelican site for one fixture case.

Each case is a directory under tests/fixtures holding the Markdown input
and the expected page. The test theme renders a Mews page skeleton that
includes the plugin's mews/head.html partial.
"""

from __future__ import annotations

from pathlib import Path
import shutil

from lxml import etree

from pelican import Pelican
from pelican.settings import read_settings

TESTS = Path(__file__).parent
FIXTURES = TESTS / "fixtures"
THEME = TESTS / "theme"

BASE_SETTINGS = {
    "ARTICLE_PATHS": [],
    # Tables and definition lists are both in the Mews subset, and both need
    # an extension turned on before python-markdown will emit them.
    "MARKDOWN": {
        "output_format": "xhtml",
        "extension_configs": {
            "markdown.extensions.tables": {},
            "markdown.extensions.def_list": {},
        },
    },
    "PAGE_PATHS": ["pages"],
    "PAGE_SAVE_AS": "{slug}.xhtml",
    "PAGE_URL": "{slug}.xhtml",
    "PLUGINS": ["pelican.plugins.mews"],
    "SITEURL": "",
    "STATIC_PATHS": [],
    "TIMEZONE": "UTC",
}


def build_case(case: str, root: Path, **override) -> Path:
    """Build the fixture site for one case; return its output directory."""
    pages = root / "content" / "pages"
    pages.mkdir(parents=True)
    shutil.copy(FIXTURES / case / "input.md", pages / "input.md")
    settings = read_settings(
        override={
            **BASE_SETTINGS,
            "PATH": str(root / "content"),
            "OUTPUT_PATH": str(root / "output"),
            "THEME": str(THEME),
            **override,
        }
    )
    Pelican(settings).run()
    return root / "output"


def normalize(data: bytes) -> str:
    """Canonical form of a Mews page, indifferent to whitespace."""
    return etree.canonicalize(xml_data=data.decode("utf-8"), strip_text=True)