"""The page emitter, against md2mews.py's.

mews.pages repeats md2mews.page() because md2mews.py is a standalone script
with its own dependencies. This is what keeps the two in step.
"""

import importlib.util
from pathlib import Path
import sys

import pytest

from mews import pages

ROOT = Path(__file__).resolve().parent.parent


def load_md2mews():
    """Import md2mews.py, which is a script rather than part of the package."""
    spec = importlib.util.spec_from_file_location("md2mews", ROOT / "md2mews.py")
    module = importlib.util.module_from_spec(spec)
    sys.modules["md2mews"] = module
    spec.loader.exec_module(module)
    return module


CASES = [
    ("Plain", ["    <p>x</p>"], "en", None, None, None),
    ("With a variant", ["    <p>x</p>"], "en", None, "mews-cool", None),
    ("Right to left", ["    <p>x</p>"], "he", "rtl", None, None),
    ("Described", ["    <p>x</p>"], "en", None, "mews-warm", "A page."),
    ("An ampersand & a <tag>", ["    <p>x</p>"], "en", None, None, None),
]


@pytest.mark.parametrize("case", CASES)
def test_the_two_emitters_agree(case):
    """Same prologue, head order, body attributes and escaping of & and <.

    The two differ on quote characters in text, which md2mews.py escapes
    because its one escape helper also fills attribute values. Both are
    well-formed; mews.pages leaves them alone so prose reads as prose.
    """
    md2mews = pytest.importorskip("mistune") and load_md2mews()
    title, body, language, direction, variant, description = case
    assert pages.page(title, body, language, direction, variant, description) == (
        md2mews.page(title, body, language, direction, variant, description)
    )


def test_a_message_page_conforms():
    from mews.lint import validate_bytes

    text = pages.message("Hello", ["One.", "Two."], [("/", "Home")])
    assert validate_bytes(text.encode()).conforms


def test_quotes_in_text_are_left_alone():
    text = pages.site_page('A "quoted" title', ["    <p>x</p>"])
    assert '<title>A "quoted" title</title>' in text


def test_an_apostrophe_is_not_escaped():
    text = pages.message("Hello", ["It isn't escaped."], [("/", "Home")])
    assert "isn't escaped" in text