"""Are already-downloaded images still alive on ChatGPT, or did we just catch them in time?

analyze_media_age.py cannot answer this. It reports whether an image was ever
captured — and an image downloaded by a run back in June looks "saved" forever
after, whether or not ChatGPT still holds it today. So a month with zero losses
proves the exports were timely, not that the assets survived.

This closes that gap: take images that ARE on disk, grouped by the month of
their conversation, and ask the API whether each still exists right now.

  Old months still 200  → assets do not expire with age. Export cadence is not
                          what saved them, and shortening it would not have
                          saved the July losses either.
  Old months now 404    → assets DO die with age; the old months are on disk
                          only because a run reached them in time. Cadence is
                          the whole ballgame, and the July losses are the first
                          ones we simply arrived too late for.

Liveness is checked with /files/{id}, which answers a missing record with a
clean 404 (verified 2026-08-17); /files/{id}/download reports the same state
as a misleading 403.

Run from the project root:

    python tools/probe_survival_by_month.py [samples_per_month]
"""

import os
import re
import sys
from collections import defaultdict
from pathlib import Path

sys.path.insert(0, str(Path(__file__).resolve().parent.parent))

from dotenv import load_dotenv

load_dotenv()

from src.providers.chatgpt import BASE_URL, ChatGPTProvider  # noqa: E402

SAVED_RE = re.compile(r"!\[([^\]]*)\]\((media/[^)]+)\)")
DATE_RE = re.compile(r"(\d{4}-\d{2}-\d{2})_")

DEFAULT_SAMPLES = 4


def collect_saved_ids(export_dir: Path) -> dict[str, list[tuple[str, str]]]:
    """month → [(file_id, source)] for images already downloaded to disk."""
    by_month: dict[str, list[tuple[str, str]]] = defaultdict(list)
    for md in export_dir.rglob("*.md"):
        date_match = DATE_RE.search(md.name)
        if not date_match:
            continue
        month = date_match.group(1)[:7]
        try:
            text = md.read_text(encoding="utf-8", errors="replace")
        except OSError:
            continue
        for source, rel_path in SAVED_RE.findall(text):
            file_id = Path(rel_path).stem
            if file_id.startswith("file"):
                by_month[month].append((file_id, source or "unknown"))
    return by_month


def main() -> None:
    samples = DEFAULT_SAMPLES
    if len(sys.argv) > 1:
        try:
            samples = max(1, int(sys.argv[1]))
        except ValueError:
            pass

    export_dir = Path(os.getenv("EXPORT_DIR", "./exports")).expanduser()
    by_month = collect_saved_ids(export_dir)
    if not by_month:
        print(f"no downloaded images found under {export_dir}")
        return

    provider = ChatGPTProvider()

    print("=" * 78)
    print(f"Are on-disk images still live on ChatGPT? ({samples} sampled per month)")
    print("=" * 78)
    print(f"{'month':<9} {'alive':>6} {'gone':>6} {'err':>5}   sampled sources")

    totals = {"alive": 0, "gone": 0, "err": 0}
    verdict_rows: list[tuple[str, int, int]] = []

    for month in sorted(by_month):
        entries = by_month[month]
        # Spread the sample across the month rather than taking the first few
        # from one conversation.
        step = max(1, len(entries) // samples)
        picked = entries[::step][:samples]

        alive = gone = err = 0
        sources: list[str] = []
        for file_id, source in picked:
            sources.append(source[:4])
            try:
                provider._pace()
                resp = provider._session.request(
                    "GET", f"{BASE_URL}/files/{file_id}", timeout=30
                )
            except Exception:  # noqa: BLE001 - diagnostic
                err += 1
                continue
            if resp.status_code == 200:
                alive += 1
            elif resp.status_code == 404:
                gone += 1
            else:
                err += 1

        totals["alive"] += alive
        totals["gone"] += gone
        totals["err"] += err
        verdict_rows.append((month, alive, gone))
        print(
            f"{month:<9} {alive:>6} {gone:>6} {err:>5}   "
            f"{','.join(sources)}  (of {len(entries)} on disk)"
        )

    print()
    print(f"total: {totals['alive']} alive, {totals['gone']} gone, {totals['err']} error")
    print()
    print("=" * 78)
    print("Verdict")
    print("=" * 78)

    old_gone = [m for m, _a, g in verdict_rows[:-2] if g]
    old_alive = [m for m, a, _g in verdict_rows[:-2] if a]

    if old_gone and not old_alive:
        print("  Every sampled older image is GONE from ChatGPT.")
        print("  → Uploads expire. Your old exports survive only because a run")
        print("    reached them in time. Export cadence directly determines")
        print("    what you can still save.")
    elif old_alive and not old_gone:
        print("  Every sampled older image is STILL LIVE on ChatGPT.")
        print("  → Uploads do not expire with age. The July losses are")
        print("    something else, and exporting sooner would not have")
        print("    prevented them.")
    else:
        print("  Mixed: some older images alive, some gone.")
        print("  → Not a clean expiry. Compare the 'sampled sources' column and")
        print("    the per-month rates above; the cause is likely per-asset.")


if __name__ == "__main__":
    main()