"""custom-html — BACKUP overlay (Phase 1d, DG4): seed a known state, back it up (assert artifact),
then mutate so the RESTORE overlay (test_restore.py) can prove the backed-up state returns. Runs on
the shared deployment; the marker it leaves ("mutated") persists for the restore tier."""

import os
import sys

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

MARKER_PATH = "/usr/share/nginx/html/ci-marker.txt"


def test_backup_captures_state(live_app, meta):
    domain = live_app
    # 1) establish a known original state, then back it up (reuse the generic op: backup + assert
    #    a snapshot artifact was produced)
    lifecycle.exec_in_app(domain, ["sh", "-c", f"echo original > {MARKER_PATH}"])
    assert lifecycle.http_fetch(domain, "/ci-marker.txt")[1].strip() == "original"
    snap = generic.do_backup(domain)
    assert snap, "backup produced no snapshot artifact"

    # 2) mutate state so a successful restore is observable (diverge from the backup)
    lifecycle.exec_in_app(domain, ["sh", "-c", f"echo mutated > {MARKER_PATH}"])
    assert lifecycle.http_fetch(domain, "/ci-marker.txt")[1].strip() == "mutated"