"""Transport lifecycle tests using controlled callback objects; no robot simulation."""
import sys
from pathlib import Path
import threading
from collections import deque
from types import SimpleNamespace as S
import unittest
import time

sys.path.insert(0, str(Path(__file__).resolve().parents[3] / 'coordinator'))
from robot_bt_coordinator.ros_backend import RosBackend


class Future:
    def __init__(self, value): self.value = value
    def result(self): return self.value
    def add_done_callback(self, cb): self.callback = cb


class Handle:
    accepted = True
    def __init__(self): self.cancels = 0; self.future = Future(None)
    def cancel_goal_async(self): self.cancels += 1
    def get_result_async(self): return self.future


class BackendLifecycle(unittest.TestCase):
    def setUp(self):
        self.backend = RosBackend.__new__(RosBackend)
        self.backend._lock = threading.RLock()
        self.backend._events = deque()
        self.backend._feedback_timeout = 5
        self.backend.node = S(get_clock=lambda: S(now=lambda: S(nanoseconds=10_000_000_000)))
        self.key = ('task', 'run')
        self.rec = dict(task_id='task', run_id='run', sent_at=time.monotonic(), last_feedback=0,
                        sequence=0, handle=None, done=False, cancel_intent=False,
                        cancel_at=None, unknown_emitted=False, wire_uuid='wire')
        self.backend._runs = {self.key: self.rec}
        self.backend._planning = {}

    def result(self, native=4, business=0, stop=1, evidence='{"stop_confirmed":true}'):
        return Future(S(status=native, result=S(result=S(status=business, stop_state=stop,
            stopped_at=S(sec=10, nanosec=0), stop_evidence_ref='proof', error_code=''),
            completed_quantity=1, evidence_json=evidence)))

    def test_cancel_before_late_accept(self):
        self.backend.cancel(*self.key)
        handle = Handle()
        self.backend._execution_accepted(self.key, Future(handle))
        self.assertEqual(handle.cancels, 1)
        self.assertFalse(self.rec['done'])
        self.assertEqual(len(self.backend._events), 0)

    def test_planning_cancel_cancels_handle(self):
        handle = Handle()
        planning = dict(task_id='task', task_revision=1, planning_generation=1, done=False, handle=handle)
        self.backend._planning = {('task', 1, 1): planning}
        self.backend.cancel('task', '')
        self.assertTrue(planning['done'])
        self.assertEqual(handle.cancels, 1)
        self.assertFalse(self.backend._events)

    def test_native_business_mismatch_quarantines(self):
        self.backend._execution_result(self.key, self.result(native=5, business=0))
        event = self.backend._events.pop()
        self.assertEqual(event['status'], 'INTERVENTION_REQUIRED')
        self.assertFalse(event['stop_confirmed'])
        self.assertFalse(self.rec['done'])  # tracking survives unknown result

    def test_unknown_stop_does_not_become_success(self):
        self.backend._execution_result(self.key, self.result(stop=0))
        self.assertEqual(self.backend._events.pop()['status'], 'INTERVENTION_REQUIRED')

    def test_stale_stop_proof_does_not_release(self):
        future = self.result()
        future.value.result.result.stopped_at.sec = 1
        self.backend._execution_result(self.key, future)
        self.assertFalse(self.backend._events.pop()['stop_confirmed'])

    def test_future_stop_proof_does_not_release(self):
        future = self.result()
        future.value.result.result.stopped_at.sec = 11
        self.backend._execution_result(self.key, future)
        self.assertFalse(self.backend._events.pop()['stop_confirmed'])

    def test_cancel_ack_never_is_stop(self):
        self.rec['handle'] = Handle()
        self.backend.cancel(*self.key)
        self.assertEqual(len(self.backend._events), 0)
        self.assertFalse(self.rec['done'])

    def test_stale_and_duplicate_feedback_do_not_refresh_liveness(self):
        def feedback(sec, sequence, stage='Navigate'):
            self.backend._feedback(self.key, S(feedback=S(stamp=S(sec=sec, nanosec=0),
                sequence=sequence, stage=stage, status_json='{}')))
        feedback(1, 1)
        self.assertEqual(self.rec['last_feedback'], 0)
        feedback(10, 2)
        accepted = self.rec['last_feedback']
        feedback(10, 2)
        self.assertEqual(self.rec['last_feedback'], accepted)
        self.assertEqual(len(self.backend._events), 1)

    def test_late_terminal_after_unknown_still_emits_evidence(self):
        self.backend._unknown(self.rec, 'ACCEPTANCE_TIMEOUT')
        self.backend._execution_result(self.key, self.result(native=5, business=2))
        events = list(self.backend._events)
        self.assertEqual([e['status'] for e in events], ['INTERVENTION_REQUIRED', 'CANCELED'])
        self.assertTrue(events[-1]['stop_confirmed'])

    def test_duplicate_json_result_fails_closed(self):
        self.backend._execution_result(self.key, self.result(evidence='{"stop_confirmed":false,"stop_confirmed":true}'))
        self.assertEqual(self.backend._events.pop()['status'], 'INTERVENTION_REQUIRED')


if __name__ == '__main__':
    unittest.main()