"""Integration tests for SessionManager + InterruptManager lifecycle.

These tests exercise the in-memory managers together, verifying the full
lifecycle of sessions and interrupts: creation, TTL sliding, interrupt
registration/resolution, and expired-interrupt cleanup.

No database required -- both managers are in-memory.
"""

from __future__ import annotations

import time
from unittest.mock import patch

import pytest

from app.interrupt_manager import InterruptManager
from app.session_manager import SessionManager

pytestmark = pytest.mark.integration


class TestSessionInterruptLifecycle:
    """Tests for the combined session + interrupt lifecycle."""

    def test_create_session_register_interrupt_check_status(self) -> None:
        """Full lifecycle: create session, register interrupt, verify both states."""
        sm = SessionManager(session_ttl_seconds=3600)
        im = InterruptManager(ttl_seconds=300)

        # Create a session
        state = sm.touch("thread-1")
        assert state.thread_id == "thread-1"
        assert not state.has_pending_interrupt
        assert not sm.is_expired("thread-1")

        # Register an interrupt
        record = im.register("thread-1", "cancel_order", {"order_id": "1042"})
        sm.extend_for_interrupt("thread-1")

        assert im.has_pending("thread-1")
        session_state = sm.get_state("thread-1")
        assert session_state is not None
        assert session_state.has_pending_interrupt

        # Session should not expire while interrupt is pending
        assert not sm.is_expired("thread-1")

    def test_interrupt_expiry_after_ttl(self) -> None:
        """Interrupt expires when TTL elapses, even if session is alive."""
        im = InterruptManager(ttl_seconds=5)

        record = im.register("thread-2", "refund", {"amount": 50})
        assert im.has_pending("thread-2")

        # Simulate time passing beyond TTL
        with patch("app.interrupt_manager.time") as mock_time:
            mock_time.time.return_value = record.created_at + 10
            assert not im.has_pending("thread-2")

            status = im.check_status("thread-2")
            assert status is not None
            assert status.is_expired
            assert status.remaining_seconds == 0.0

    def test_interrupt_resolve_flow(self) -> None:
        """Resolving an interrupt removes it from pending and resets session."""
        sm = SessionManager(session_ttl_seconds=3600)
        im = InterruptManager(ttl_seconds=300)

        sm.touch("thread-3")
        im.register("thread-3", "delete_account", {"user_id": "u1"})
        sm.extend_for_interrupt("thread-3")

        # Verify pending state
        assert im.has_pending("thread-3")
        assert sm.get_state("thread-3").has_pending_interrupt

        # Resolve
        im.resolve("thread-3")
        sm.resolve_interrupt("thread-3")

        assert not im.has_pending("thread-3")
        session_state = sm.get_state("thread-3")
        assert session_state is not None
        assert not session_state.has_pending_interrupt

    def test_cleanup_expired_removes_old_interrupts(self) -> None:
        """cleanup_expired removes only expired interrupts, keeping active ones."""
        im = InterruptManager(ttl_seconds=10)

        # Register two interrupts at different times
        old_record = im.register("thread-old", "action_old", {})
        new_record = im.register("thread-new", "action_new", {})

        # Simulate time where only old one expired
        with patch("app.interrupt_manager.time") as mock_time:
            # Move old record's creation to the past
            im._interrupts["thread-old"] = old_record.__class__(
                interrupt_id=old_record.interrupt_id,
                thread_id=old_record.thread_id,
                action=old_record.action,
                params=old_record.params,
                created_at=time.time() - 20,
                ttl_seconds=old_record.ttl_seconds,
            )
            mock_time.time.return_value = time.time()

        expired = im.cleanup_expired()
        assert len(expired) == 1
        assert expired[0].thread_id == "thread-old"

        # New one should still be pending
        assert im.has_pending("thread-new")
        assert not im.has_pending("thread-old")

    def test_session_ttl_sliding_window(self) -> None:
        """Touching a session resets the sliding window TTL."""
        sm = SessionManager(session_ttl_seconds=3600)

        state1 = sm.touch("thread-5")
        first_activity = state1.last_activity

        time.sleep(0.01)
        state2 = sm.touch("thread-5")
        second_activity = state2.last_activity

        assert second_activity > first_activity
        assert not sm.is_expired("thread-5")

    def test_session_expires_after_ttl_without_activity(self) -> None:
        """Session expires when TTL passes without a touch or interrupt."""
        sm = SessionManager(session_ttl_seconds=0)
        sm.touch("thread-6")

        # TTL is 0 so session is immediately expired
        assert sm.is_expired("thread-6")

    def test_pending_interrupt_prevents_session_expiry(self) -> None:
        """A session with pending interrupt does not expire even with TTL=0."""
        sm = SessionManager(session_ttl_seconds=0)
        sm.touch("thread-7")
        sm.extend_for_interrupt("thread-7")

        # Even with TTL=0, session should not expire because of pending interrupt
        assert not sm.is_expired("thread-7")

    def test_retry_prompt_for_expired_interrupt(self) -> None:
        """InterruptManager generates a retry prompt for expired interrupts."""
        im = InterruptManager(ttl_seconds=300)
        record = im.register("thread-8", "cancel_order", {"order_id": "1042"})

        prompt = im.generate_retry_prompt(record)

        assert prompt["type"] == "interrupt_expired"
        assert prompt["thread_id"] == "thread-8"
        assert "cancel_order" in prompt["action"]
        assert "cancel_order" in prompt["message"]
        assert "expired" in prompt["message"].lower()