import re
from email import message_from_bytes
from email.policy import default
from pathlib import Path

from inkwell import mail_templates
from inkwell.mailer import MailSettings, build_message

LINK = "https://notes.example.test/reset-password?token=abc-123"


def test_every_email_carries_its_link_in_both_parts():
    for email in (
        mail_templates.password_reset("Inkwell", "a@example.test", LINK),
        mail_templates.invite("Inkwell", "Sam", LINK, 7),
    ):
        assert LINK in email.text
        assert f'href="{LINK}"' in email.html


def test_text_from_settings_and_people_is_escaped_in_the_html():
    email = mail_templates.invite('<b>Ink</b> & "co"', "<script>x</script>", LINK, 1)
    assert "<script>" not in email.html
    assert "&lt;b&gt;Ink&lt;/b&gt; &amp;" in email.html
    # The text part is plain text, so it is left as written.
    assert "<script>x</script>" in email.text
    assert "within a day" in email.text


def test_the_html_fetches_nothing():
    """No remote images or fonts: the app sends with no outbound network, and a remote
    image in an email is a tracking pixel. The one image is the logo, carried inside
    the message and named by cid."""
    email = mail_templates.password_reset("Inkwell", "a@example.test", LINK)
    assert re.findall(r'src="([^"]*)"', email.html) == [f"cid:{mail_templates.LOGO_CID}"]
    assert "@import" not in email.html and "<link" not in email.html
    assert email.images == {mail_templates.LOGO_CID: mail_templates.logo_png()}


def test_the_email_logo_is_the_app_icon():
    """A copy, so the package carries it; this keeps the copy from drifting."""
    icon = Path(__file__).resolve().parents[1] / "frontend" / "public" / "icon-192.png"
    assert mail_templates.logo_png() == icon.read_bytes()
    assert mail_templates.logo_png().startswith(b"\x89PNG")


def test_the_message_is_text_first_then_html():
    cfg = MailSettings("smtp.example.test", 587, "starttls", "", "", "inkwell@example.test", "https://x")
    msg = build_message(cfg, "a@example.test", mail_templates.test_message("Inkwell", "https://x"))
    parsed = message_from_bytes(msg.as_bytes(), policy=default)
    assert parsed.get_content_type() == "multipart/alternative"
    text, related = parsed.iter_parts()
    assert text.get_content_type() == "text/plain"
    # The HTML travels with the logo it shows: multipart/related, html first.
    assert related.get_content_type() == "multipart/related"
    html, logo = related.iter_parts()
    assert html.get_content_type() == "text/html"
    assert f"cid:{mail_templates.LOGO_CID}" in html.get_content()
    assert logo.get_content_type() == "image/png"
    assert logo["Content-ID"] == f"<{mail_templates.LOGO_CID}>"
    assert logo.get_content() == mail_templates.logo_png()
    assert parsed["Subject"] == "Inkwell test email"