#!/usr/bin/env python3
"""
Duplicate and relation auditor for UnsolvedAstronomy v1.1.0.
Verifies 0 duplicate canonical problem statements among published records and validates merged_duplicate links.
"""
import json
import re
import sys
from collections import Counter
from pathlib import Path

ROOT = Path(__file__).resolve().parent.parent
PROBLEMS_FILE = ROOT / "problems.json"
ARCHIVED_FILE = ROOT / "archived_problems.json"


def norm_text(s: str) -> str:
    return re.sub(r"[^a-z0-9]+", " ", (s or "").lower()).strip()


def main():
    if not PROBLEMS_FILE.exists():
        print(f"Missing {PROBLEMS_FILE}")
        sys.exit(1)
    published = json.loads(PROBLEMS_FILE.read_text(encoding="utf-8"))
    archived = json.loads(ARCHIVED_FILE.read_text(encoding="utf-8")) if ARCHIVED_FILE.exists() else []
    dups = [r for r in archived if r["status"] == "merged_duplicate"]

    stmt_norms = Counter(norm_text(r["statement"]) for r in published)
    collisions = {k: v for k, v in stmt_norms.items() if v > 1}
    title_norms = Counter(norm_text(r["title"]) for r in published)
    title_collisions = {k: v for k, v in title_norms.items() if v > 1}
    pub_ids = {r["id"] for r in published}

    bad_dup_targets = [r["id"] for r in dups if r.get("duplicate_of") not in pub_ids]
    low_src_records = [
        r["id"]
        for r in published
        if len({s.get("source_id") for s in r.get("sources", []) if s.get("source_id")}) < 4
    ]

    print(f"Checked {len(published)} published records and {len(dups)} merged_duplicate records.")
    print(f"  Statement collisions among published: {len(collisions)}")
    print(f"  Title collisions among published: {len(title_collisions)}")
    print(f"  Published records with < 4 distinct literature sources: {len(low_src_records)}")
    print(f"  Invalid duplicate_of targets: {len(bad_dup_targets)}")
    if collisions or title_collisions or low_src_records or bad_dup_targets:
        sys.exit(1)


if __name__ == "__main__":
    main()