"""matrix-synapse — BACKUP overlay (Phase 1d, DG4): seed a postgres marker, back it up (the recipe's
pg_backup.sh pre-hook dumps the DB to backup.sql; assert a snapshot artifact), then mutate (drop the
marker) so the RESTORE overlay (test_restore.py) can prove the backed-up state returns. Runs on the
shared deployment; the mutated state persists for the restore tier.

This exercises the real DB-dump backup hook (backupbot.backup.pre-hook / restore.post-hook), not a
plain volume copy — the meaningful data path for a postgres-backed app."""

import os
import sys

sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "..", "runner"))
from harness import generic, lifecycle  # noqa: E402


def _psql(domain, sql):
    cmd = f'PGPASSWORD=$(cat /run/secrets/db_password) psql -U synapse -d synapse -tAc "{sql}"'
    return lifecycle.exec_in_app(domain, ["sh", "-c", cmd], service="db").strip()


def test_backup_captures_state(live_app, meta):
    domain = live_app

    # 1) establish original state in postgres, then back up (reuse the generic op: backup +
    #    assert a snapshot artifact; pg_backup.sh dumps the DB)
    _psql(
        domain,
        "CREATE TABLE IF NOT EXISTS ci_marker(v text); DELETE FROM ci_marker; "
        "INSERT INTO ci_marker VALUES('original');",
    )
    assert _psql(domain, "SELECT v FROM ci_marker;") == "original"
    snap = generic.do_backup(domain)
    assert snap, "backup produced no snapshot artifact"

    # 2) mutate: drop the marker table (diverge from the backup)
    _psql(domain, "DROP TABLE ci_marker;")
    assert _psql(domain, "SELECT to_regclass('public.ci_marker');") in (
        "",
        "NULL",
    ), "drop did not take"