"""
Accepted SEO exceptions — consciously-waived findings for SPECIFIC posts.

This is an A-side (auditor) REPORTING filter, NOT a rule change. The shared rule
engine (seo_rules.py) still CHECKS every rule on every post; the auditor simply
moves a matching violation into a separate "Accepted exceptions (won't fix —
documented)" section so the headline "issues to fix" count reflects only
genuinely-actionable items. Each waiver carries its REASON (no silent skips).

Structure:   EXCEPTIONS[rule_family][slug] = "documented reason"

Scope:
  - A waiver applies ONLY to the named rule family for the named slug. Any OTHER
    rule the same post violates still surfaces as a real issue.
  - A waiver is matched against a Violation whose `rule` equals the family key or
    starts with "<family>." — so "internal_links" covers "internal_links.too_few".
  - If a post later stops violating the rule (e.g. a link is added and it clears
    the threshold), there's simply no violation to waive — the waiver is moot.

Tool C (seo_validate.py, pre-publish validator) deliberately does NOT consult
this registry: exceptions are per-EXISTING-post decisions; a brand-new draft is
held to the full standard.
"""

EXCEPTIONS = {
    # internal_links < 2 — these posts are intentionally left as-is because there
    # is no honest 2nd internal-link target in their prose; forcing one would hurt
    # quality. (Decided 2026-06-23.)
    "internal_links": {
        "roswell-1947-ufo-incident":
            "1 link (Spielberg); no 2nd entity in prose maps to an article — "
            "forcing a link would hurt quality.",
        "manises-1979-spain-ufo-incident":
            "1 link (Canary Islands); no 2nd entity in prose maps to an article.",
        "betty-barney-hill-1961-abduction":
            "1 link (alien abduction → travis-walton, thematic); no 2nd honest target.",
        "malmstrom-1967-ufo-nuclear-missiles-incident":
            "1 link (Grusch); the only entity named in the prose.",
        "rendlesham-forest-incident-1980":
            "0 links; genuinely isolated — no entity in prose maps to one of our articles.",
        "phoenix-lights-1997":
            "0 links; only thematic candidates are stretches — left as-is.",
        "canary-islands-1976-ufo-sighting":
            "1 link (reciprocal → manises); no honest 2nd entity in prose — "
            "Spanish case, self-contained.",
    },
}


def accepted_reason(rule, slug):
    """Return the documented waiver reason if (rule, slug) is an accepted
    exception, else None.

    Matches a rule-family key to a Violation whose `rule` is the key itself or
    "<key>.<detail>" (e.g. family "internal_links" matches "internal_links.too_few").
    """
    for family, slugs in EXCEPTIONS.items():
        if (rule == family or rule.startswith(family + ".")) and slug in slugs:
            return slugs[slug]
    return None