"""Tests for PostgresStateBackend graceful degradation.

When psycopg2 is unavailable, all operations are no-ops.
"""

from fusionagi.core.postgres_backend import PostgresStateBackend
from fusionagi.schemas.task import Task, TaskState


def test_graceful_fallback_without_psycopg2():
    """PostgresStateBackend should silently degrade when Postgres is unreachable."""
    backend = PostgresStateBackend(dsn="postgresql://invalid:invalid@localhost:1/invalid")
    assert backend._available is False

    # All reads return None/empty
    assert backend.get_task("t1") is None
    assert backend.get_task_state("t1") is None
    assert backend.get_trace("t1") == []
    assert backend.list_tasks() == []
    assert backend.count_tasks() == 0

    # All writes are no-ops
    backend.set_task(Task(task_id="t1", goal="test"))
    backend.set_task_state("t1", TaskState.ACTIVE)
    backend.append_trace("t1", {"step": 1})
    assert backend.delete_task("t1") is False

    # Close is safe
    backend.close()
    assert backend._available is False