#!/usr/bin/env python3
"""
Detect a silently dead Instagram session from a stories run's output.

A dead session (killed server-side while the sessionid is still in the cookie jar, so
check-session.py passes) shows up as every fetched stories source returning
"No results" -- the daily run still exits 0. From 2026-10-07 all six profiles came back
empty every day and nothing alerted. One all-empty day is normal (nobody posted a story);
several in a row across ALL sources is not.

Usage: stories-streak.py <this run's output file> [state file]
Counts at most one day per calendar date (manual re-runs don't inflate it). Prints a message
and exits 1 once the streak reaches GDL_EMPTY_STREAK_FAIL days (default 3); exits 0 otherwise.
Runs that fetched nothing (all skipped / no sources) leave the streak untouched.
"""
import datetime as dt
import os
import re
import sys
from pathlib import Path

THRESHOLD = int(os.environ.get("GDL_EMPTY_STREAK_FAIL", "3"))


def main() -> int:
    out = Path(sys.argv[1]).read_text(errors="replace")
    state = Path(sys.argv[2] if len(sys.argv) > 2
                 else Path.home() / "gdl" / "stories-empty-streak")
    m = re.search(r"sources\s*:\s*(\d+) to sync", out)
    to_sync = int(m.group(1)) if m else 0
    if to_sync == 0:
        return 0                                    # nothing fetched: no evidence either way
    empty = len(re.findall(r"No results for \S*/stories/", out))
    today = dt.date.today().isoformat()
    last_date, streak = "", 0
    try:
        last_date, s = state.read_text().split()
        streak = int(s)
    except (OSError, ValueError):
        pass
    if empty >= to_sync:                            # every fetched source came back empty
        if last_date != today:
            streak += 1
    else:
        streak = 0
    state.write_text(f"{today} {streak}\n")
    if streak >= THRESHOLD:
        print(f"SESSION LIKELY DEAD: stories came back empty for ALL {to_sync} profile(s) on "
              f"{streak} consecutive day(s). The cookie is present but Instagram is probably "
              "no longer honouring it -- log in again in the Chrome window (reload the tab to "
              "check) and re-run.")
        return 1
    return 0


if __name__ == "__main__":
    sys.exit(main())