#!/usr/bin/env python3
"""Verify a folder was backed up as SEPARATE .eml files.
Usage: check_backup.py <dir> <subjectA||subjectB||...>. Prints "Backup OK!" only
if the dir holds >= N distinct .eml files, each parseable as one message, that
collectively cover every expected subject (one subject per file). A single
combined export, a non-.eml file, or a no-op fails -> not a false positive; the
filename itself is not constrained (agent-independent)."""
import sys, os, glob, email

def main():
    if len(sys.argv) < 3:
        print("Backup incomplete!"); return
    d, subs = sys.argv[1], [s for s in sys.argv[2].split("||") if s]
    emls = glob.glob(os.path.join(d, "*.eml"))
    if len(emls) < len(subs):
        print("Backup incomplete! ({} eml, need {})".format(len(emls), len(subs))); return
    remaining, used = list(subs), set()
    for p in emls:
        try:
            subj = email.message_from_file(
                open(p, encoding="utf-8", errors="replace")).get("Subject") or ""
        except Exception:
            continue
        for s in list(remaining):
            if s.lower() in subj.lower() and p not in used:
                remaining.remove(s); used.add(p); break
    print("Backup OK! ({} eml files)".format(len(emls)) if not remaining
          else "Backup incomplete!")

main()