"""custom-html — backup/restore stage (D2): backup, mutate state, restore, assert the restored
state matches the pre-mutation (backed-up) state."""
import os
import sys

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

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


def test_backup_mutate_restore(deployed):
    domain = deployed

    # 1) establish original state, then back it up
    lifecycle.exec_in_app(domain, ["sh", "-c", f"echo original > {MARKER_PATH}"])
    assert lifecycle.http_body(domain, "/ci-marker.txt").strip() == "original"
    lifecycle.backup_app(domain)

    # 2) mutate state (diverge from the backup)
    lifecycle.exec_in_app(domain, ["sh", "-c", f"echo mutated > {MARKER_PATH}"])
    assert lifecycle.http_body(domain, "/ci-marker.txt").strip() == "mutated"

    # 3) restore -> state returns to the backed-up "original"
    lifecycle.restore_app(domain)
    lifecycle.wait_healthy(domain)
    assert lifecycle.http_body(domain, "/ci-marker.txt").strip() == "original", \
        "restore did not return the pre-mutation state"