"""Tests for /restart slash command."""

from __future__ import annotations

import asyncio
import time
from unittest.mock import AsyncMock, MagicMock, patch

import pytest

from nanobot.bus.events import InboundMessage, OutboundMessage
from nanobot.providers.base import LLMResponse


def _make_loop():
    """Create a minimal AgentLoop with mocked dependencies."""
    from nanobot.agent.loop import AgentLoop
    from nanobot.bus.queue import MessageBus

    bus = MessageBus()
    provider = MagicMock()
    provider.get_default_model.return_value = "test-model"
    workspace = MagicMock()
    workspace.__truediv__ = MagicMock(return_value=MagicMock())

    with patch("nanobot.agent.loop.ContextBuilder"), \
         patch("nanobot.agent.loop.SessionManager"), \
         patch("nanobot.agent.loop.SubagentManager"):
        loop = AgentLoop(bus=bus, provider=provider, workspace=workspace)
    return loop, bus


class TestRestartCommand:

    @pytest.mark.asyncio
    async def test_restart_sends_message_and_calls_execv(self):
        loop, bus = _make_loop()
        msg = InboundMessage(channel="cli", sender_id="user", chat_id="direct", content="/restart")

        with patch("nanobot.agent.loop.os.execv") as mock_execv:
            await loop._handle_restart(msg)
            out = await asyncio.wait_for(bus.consume_outbound(), timeout=1.0)
            assert "Restarting" in out.content

            await asyncio.sleep(1.5)
            mock_execv.assert_called_once()

    @pytest.mark.asyncio
    async def test_restart_intercepted_in_run_loop(self):
        """Verify /restart is handled at the run-loop level, not inside _dispatch."""
        loop, bus = _make_loop()
        msg = InboundMessage(channel="telegram", sender_id="u1", chat_id="c1", content="/restart")

        with patch.object(loop, "_handle_restart") as mock_handle:
            mock_handle.return_value = None
            await bus.publish_inbound(msg)

            loop._running = True
            run_task = asyncio.create_task(loop.run())
            await asyncio.sleep(0.1)
            loop._running = False
            run_task.cancel()
            try:
                await run_task
            except asyncio.CancelledError:
                pass

            mock_handle.assert_called_once()

    @pytest.mark.asyncio
    async def test_status_intercepted_in_run_loop(self):
        """Verify /status is handled at the run-loop level for immediate replies."""
        loop, bus = _make_loop()
        msg = InboundMessage(channel="telegram", sender_id="u1", chat_id="c1", content="/status")

        with patch.object(loop, "_status_response") as mock_status:
            mock_status.return_value = OutboundMessage(
                channel="telegram", chat_id="c1", content="status ok"
            )
            await bus.publish_inbound(msg)

            loop._running = True
            run_task = asyncio.create_task(loop.run())
            await asyncio.sleep(0.1)
            loop._running = False
            run_task.cancel()
            try:
                await run_task
            except asyncio.CancelledError:
                pass

            mock_status.assert_called_once()
            out = await asyncio.wait_for(bus.consume_outbound(), timeout=1.0)
            assert out.content == "status ok"

    @pytest.mark.asyncio
    async def test_run_propagates_external_cancellation(self):
        """External task cancellation should not be swallowed by the inbound wait loop."""
        loop, _bus = _make_loop()

        run_task = asyncio.create_task(loop.run())
        await asyncio.sleep(0.1)
        run_task.cancel()

        with pytest.raises(asyncio.CancelledError):
            await asyncio.wait_for(run_task, timeout=1.0)

    @pytest.mark.asyncio
    async def test_help_includes_restart(self):
        loop, bus = _make_loop()
        msg = InboundMessage(channel="telegram", sender_id="u1", chat_id="c1", content="/help")

        response = await loop._process_message(msg)

        assert response is not None
        assert "/restart" in response.content
        assert "/status" in response.content
        assert response.metadata == {"render_as": "text"}

    @pytest.mark.asyncio
    async def test_status_reports_runtime_info(self):
        loop, _bus = _make_loop()
        session = MagicMock()
        session.get_history.return_value = [{"role": "user"}] * 3
        loop.sessions.get_or_create.return_value = session
        loop._start_time = time.time() - 125
        loop._last_usage = {"prompt_tokens": 0, "completion_tokens": 0}
        loop.memory_consolidator.estimate_session_prompt_tokens = MagicMock(
            return_value=(20500, "tiktoken")
        )

        msg = InboundMessage(channel="telegram", sender_id="u1", chat_id="c1", content="/status")

        response = await loop._process_message(msg)

        assert response is not None
        assert "Model: test-model" in response.content
        assert "Tokens: 0 in / 0 out" in response.content
        assert "Context: 20k/64k (31%)" in response.content
        assert "Session: 3 messages" in response.content
        assert "Uptime: 2m 5s" in response.content
        assert response.metadata == {"render_as": "text"}

    @pytest.mark.asyncio
    async def test_run_agent_loop_resets_usage_when_provider_omits_it(self):
        loop, _bus = _make_loop()
        loop.provider.chat_with_retry = AsyncMock(side_effect=[
            LLMResponse(content="first", usage={"prompt_tokens": 9, "completion_tokens": 4}),
            LLMResponse(content="second", usage={}),
        ])

        await loop._run_agent_loop([])
        assert loop._last_usage == {"prompt_tokens": 9, "completion_tokens": 4}

        await loop._run_agent_loop([])
        assert loop._last_usage == {"prompt_tokens": 0, "completion_tokens": 0}

    @pytest.mark.asyncio
    async def test_status_falls_back_to_last_usage_when_context_estimate_missing(self):
        loop, _bus = _make_loop()
        session = MagicMock()
        session.get_history.return_value = [{"role": "user"}]
        loop.sessions.get_or_create.return_value = session
        loop._last_usage = {"prompt_tokens": 1200, "completion_tokens": 34}
        loop.memory_consolidator.estimate_session_prompt_tokens = MagicMock(
            return_value=(0, "none")
        )

        response = await loop._process_message(
            InboundMessage(channel="telegram", sender_id="u1", chat_id="c1", content="/status")
        )

        assert response is not None
        assert "Tokens: 1200 in / 34 out" in response.content
        assert "Context: 1k/64k (1%)" in response.content

    @pytest.mark.asyncio
    async def test_process_direct_preserves_render_metadata(self):
        loop, _bus = _make_loop()
        session = MagicMock()
        session.get_history.return_value = []
        loop.sessions.get_or_create.return_value = session
        loop.subagents.get_running_count.return_value = 0

        response = await loop.process_direct("/status", session_key="cli:test")

        assert response is not None
        assert response.metadata == {"render_as": "text"}