import pytest
from cursor_flasher.state import FlasherState, StateMachine


class TestStateMachine:
    def test_initial_state_is_idle(self):
        sm = StateMachine()
        assert sm.state == FlasherState.IDLE

    def test_idle_to_agent_working(self):
        sm = StateMachine()
        changed = sm.update(agent_working=True, approval_needed=False)
        assert sm.state == FlasherState.AGENT_WORKING
        assert changed is True

    def test_agent_working_to_waiting(self):
        sm = StateMachine()
        sm.update(agent_working=True, approval_needed=False)
        changed = sm.update(agent_working=False, approval_needed=False)
        assert sm.state == FlasherState.WAITING_FOR_USER
        assert changed is True

    def test_approval_needed_triggers_waiting(self):
        sm = StateMachine()
        sm.update(agent_working=True, approval_needed=False)
        changed = sm.update(agent_working=False, approval_needed=True)
        assert sm.state == FlasherState.WAITING_FOR_USER
        assert changed is True

    def test_idle_does_not_jump_to_waiting(self):
        sm = StateMachine()
        changed = sm.update(agent_working=False, approval_needed=False)
        assert sm.state == FlasherState.IDLE
        assert changed is False

    def test_waiting_to_user_interacting(self):
        sm = StateMachine()
        sm.update(agent_working=True, approval_needed=False)
        sm.update(agent_working=False, approval_needed=False)
        assert sm.state == FlasherState.WAITING_FOR_USER
        changed = sm.dismiss()
        assert sm.state == FlasherState.IDLE
        assert changed is True

    def test_waiting_to_agent_working(self):
        sm = StateMachine()
        sm.update(agent_working=True, approval_needed=False)
        sm.update(agent_working=False, approval_needed=False)
        changed = sm.update(agent_working=True, approval_needed=False)
        assert sm.state == FlasherState.AGENT_WORKING
        assert changed is True

    def test_no_change_returns_false(self):
        sm = StateMachine()
        sm.update(agent_working=True, approval_needed=False)
        changed = sm.update(agent_working=True, approval_needed=False)
        assert changed is False

    def test_cooldown_prevents_immediate_retrigger(self):
        sm = StateMachine(cooldown=5.0)
        sm.update(agent_working=True, approval_needed=False)
        sm.update(agent_working=False, approval_needed=False)
        assert sm.state == FlasherState.WAITING_FOR_USER
        sm.dismiss()
        sm.update(agent_working=True, approval_needed=False)
        changed = sm.update(agent_working=False, approval_needed=False)
        assert sm.cooldown == 5.0

    def test_direct_approval_from_idle(self):
        """If we detect approval buttons without seeing agent_working first,
        still transition to WAITING_FOR_USER."""
        sm = StateMachine()
        changed = sm.update(agent_working=False, approval_needed=True)
        assert sm.state == FlasherState.WAITING_FOR_USER
        assert changed is True