"""B1 wiring — Mobile Consent-Reachability check + HTML block.

Fetches the homepage of the first submitted URL, runs the static
`evaluate_reachability` analysis on the footer, and renders the
result as an HTML block for the audit mail.

Only renders a block when the check FAILS — a passing site doesn't
need a block. The block is severity-colored and lists the specific
notes that triggered the finding (missing reopen anchor, new-tab
break, browser-deflection language).
"""

from __future__ import annotations

import html
import logging

import httpx

from compliance.services.consent_reachability_check import (
    evaluate_reachability,
)

from ._helpers import _update

logger = logging.getLogger(__name__)


async def run_b1(state: dict) -> None:
    """Run the reachability check + render HTML. Mutates state in place."""
    req = state["req"]
    check_id = state["check_id"]
    homepage_url = ""
    for d in req.documents:
        if d.url:
            from urllib.parse import urlparse
            p = urlparse(d.url)
            if p.scheme and p.netloc:
                homepage_url = f"{p.scheme}://{p.netloc}/"
                break
    if not homepage_url:
        return

    _update(check_id, "Mobile Consent-Reachability prüfen...", 95)
    try:
        async with httpx.AsyncClient(
            timeout=20.0, follow_redirects=True,
            headers={"User-Agent": "Mozilla/5.0 (iPhone; CPU iPhone OS 17_5 "
                     "like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) "
                     "Version/17.5 Mobile/15E148 Safari/604.1"},
        ) as c:
            r = await c.get(homepage_url)
            if r.status_code != 200:
                logger.info("B1: homepage fetch %s → HTTP %d", homepage_url, r.status_code)
                return
            page_html = r.text
    except Exception as e:
        logger.warning("B1: homepage fetch failed: %s", e)
        return

    finding = evaluate_reachability(page_html, homepage_url)
    state["reachability_finding"] = finding
    state["reachability_html"] = _render_block(finding)
    logger.info(
        "B1 Reachability: passed=%s severity=%s reason=%s",
        finding["passed"], finding.get("severity"),
        finding.get("severity_reason"),
    )


def _render_block(finding: dict) -> str:
    """Render the reachability finding as an audit-mail HTML block."""
    if finding["passed"]:
        return ""
    sev = (finding.get("severity") or "").upper()
    color = "#dc2626" if sev == "HIGH" else "#f59e0b"
    notes_html = "".join(
        f"<li>{html.escape(n)}</li>" for n in finding.get("notes") or []
    )
    anchor = finding.get("reopen_anchor") or {}
    anchor_html = ""
    if anchor:
        anchor_html = (
            "<p style='margin:8px 0 0;font-size:13px;color:#475569;'>"
            "Gefundener Footer-Link: "
            f"<code>{html.escape((anchor.get('text') or '')[:80])}</code> "
            f"→ <code>{html.escape((anchor.get('href') or '')[:120])}</code> "
            f"(target_class: {html.escape(anchor.get('target_class') or '—')})"
            "</p>"
        )
    return (
        f"<div style='margin:24px 0;padding:16px;border-left:4px solid {color};"
        "background:#fef2f2;border-radius:4px;'>"
        f"<h2 style='margin:0 0 8px;color:{color};font-size:16px;'>"
        "COOKIE-CONSENT-UX-001 — Mobile Consent-Reachability</h2>"
        f"<p style='margin:0 0 8px;font-size:14px;'><strong>Severity:</strong> "
        f"{sev} ({html.escape(finding.get('severity_reason') or '')})</p>"
        "<p style='margin:0 0 4px;font-size:14px;'>"
        "Art. 7 Abs. 3 DSGVO: Widerruf muss so einfach wie Erteilung sein. "
        "Auf Mobile-Safari konnten wir folgendes Problem feststellen:</p>"
        f"<ul style='margin:8px 0 0 20px;font-size:14px;color:#7f1d1d;'>"
        f"{notes_html}</ul>"
        f"{anchor_html}"
        "</div>"
    )