"""Tests for /v1/runs endpoints: start, events, and stop.

Covers:
- POST /v1/runs — start a run (202)
- GET /v1/runs/{run_id}/events — SSE event stream
- POST /v1/runs/{run_id}/stop — interrupt a running agent
- Auth, error handling, and cleanup
"""

import asyncio
import json
import threading
import time as _time
from unittest.mock import AsyncMock, MagicMock, patch

import pytest
from aiohttp import web
from aiohttp.test_utils import TestClient, TestServer

from gateway.config import PlatformConfig
from gateway.platforms.api_server import (
    APIServerAdapter,
    cors_middleware,
    security_headers_middleware,
)


# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------


def _make_adapter(api_key: str = "") -> APIServerAdapter:
    """Create an adapter with optional API key."""
    extra = {}
    if api_key:
        extra["key"] = api_key
    config = PlatformConfig(enabled=True, extra=extra)
    adapter = APIServerAdapter(config)
    return adapter


def _create_runs_app(adapter: APIServerAdapter) -> web.Application:
    """Create an aiohttp app with /v1/runs routes registered."""
    mws = [mw for mw in (cors_middleware, security_headers_middleware) if mw is not None]
    app = web.Application(middlewares=mws)
    app["api_server_adapter"] = adapter
    app.router.add_post("/v1/runs", adapter._handle_runs)
    app.router.add_get("/v1/runs/{run_id}/events", adapter._handle_run_events)
    app.router.add_post("/v1/runs/{run_id}/stop", adapter._handle_stop_run)
    return app


def _make_slow_agent(**kwargs):
    """Create a mock agent that blocks in run_conversation until interrupted.

    Returns (mock_agent, agent_ready_event, interrupt_event) where
    agent_ready_event is set once run_conversation starts, and
    interrupt_event is set when interrupt() is called.
    """
    ready = threading.Event()
    interrupted = threading.Event()

    mock_agent = MagicMock()

    def _do_interrupt(message=None):
        interrupted.set()

    mock_agent.interrupt = MagicMock(side_effect=_do_interrupt)

    def _slow_run(user_message=None, conversation_history=None, task_id=None):
        ready.set()
        # Block until interrupt() is called
        interrupted.wait(timeout=10)
        return {"final_response": "interrupted"}

    mock_agent.run_conversation.side_effect = _slow_run
    mock_agent.session_prompt_tokens = 0
    mock_agent.session_completion_tokens = 0
    mock_agent.session_total_tokens = 0

    return mock_agent, ready, interrupted


@pytest.fixture
def adapter():
    return _make_adapter()


@pytest.fixture
def auth_adapter():
    return _make_adapter(api_key="sk-secret")


# ---------------------------------------------------------------------------
# POST /v1/runs — start a run
# ---------------------------------------------------------------------------


class TestStartRun:
    @pytest.mark.asyncio
    async def test_start_returns_202(self, adapter):
        app = _create_runs_app(adapter)
        async with TestClient(TestServer(app)) as cli:
            with patch.object(adapter, "_create_agent") as mock_create:
                mock_agent = MagicMock()
                mock_agent.run_conversation.return_value = {"final_response": "done"}
                mock_agent.session_prompt_tokens = 10
                mock_agent.session_completion_tokens = 5
                mock_agent.session_total_tokens = 15
                mock_create.return_value = mock_agent

                resp = await cli.post("/v1/runs", json={"input": "hello"})
                assert resp.status == 202
                data = await resp.json()
                assert data["status"] == "started"
                assert data["run_id"].startswith("run_")

    @pytest.mark.asyncio
    async def test_start_invalid_json_returns_400(self, adapter):
        app = _create_runs_app(adapter)
        async with TestClient(TestServer(app)) as cli:
            resp = await cli.post(
                "/v1/runs",
                data="not json",
                headers={"Content-Type": "application/json"},
            )
        assert resp.status == 400

    @pytest.mark.asyncio
    async def test_start_missing_input_returns_400(self, adapter):
        app = _create_runs_app(adapter)
        async with TestClient(TestServer(app)) as cli:
            resp = await cli.post("/v1/runs", json={"model": "test"})
            assert resp.status == 400
            data = await resp.json()
            assert "input" in data["error"]["message"]

    @pytest.mark.asyncio
    async def test_start_empty_input_returns_400(self, adapter):
        app = _create_runs_app(adapter)
        async with TestClient(TestServer(app)) as cli:
            resp = await cli.post("/v1/runs", json={"input": ""})
        assert resp.status == 400

    @pytest.mark.asyncio
    async def test_start_requires_auth(self, auth_adapter):
        app = _create_runs_app(auth_adapter)
        async with TestClient(TestServer(app)) as cli:
            resp = await cli.post("/v1/runs", json={"input": "hello"})
        assert resp.status == 401

    @pytest.mark.asyncio
    async def test_start_with_valid_auth(self, auth_adapter):
        app = _create_runs_app(auth_adapter)
        async with TestClient(TestServer(app)) as cli:
            with patch.object(auth_adapter, "_create_agent") as mock_create:
                mock_agent = MagicMock()
                mock_agent.run_conversation.return_value = {"final_response": "ok"}
                mock_agent.session_prompt_tokens = 0
                mock_agent.session_completion_tokens = 0
                mock_agent.session_total_tokens = 0
                mock_create.return_value = mock_agent

                resp = await cli.post(
                    "/v1/runs",
                    json={"input": "hello"},
                    headers={"Authorization": "Bearer sk-secret"},
                )
                assert resp.status == 202


# ---------------------------------------------------------------------------
# GET /v1/runs/{run_id}/events — SSE event stream
# ---------------------------------------------------------------------------


class TestRunEvents:
    @pytest.mark.asyncio
    async def test_events_stream_returns_completed(self, adapter):
        """Events stream should receive run.completed when agent finishes."""
        app = _create_runs_app(adapter)
        async with TestClient(TestServer(app)) as cli:
            with patch.object(adapter, "_create_agent") as mock_create:
                mock_agent = MagicMock()
                mock_agent.run_conversation.return_value = {"final_response": "Hello!"}
                mock_agent.session_prompt_tokens = 10
                mock_agent.session_completion_tokens = 5
                mock_agent.session_total_tokens = 15
                mock_create.return_value = mock_agent

                # Start run
                resp = await cli.post("/v1/runs", json={"input": "hello"})
                assert resp.status == 202
                data = await resp.json()
                run_id = data["run_id"]

                # Subscribe to events
                events_resp = await cli.get(f"/v1/runs/{run_id}/events")
                assert events_resp.status == 200
                body = await events_resp.text()

                # Should contain run.completed
                assert "run.completed" in body
                assert "Hello!" in body

    @pytest.mark.asyncio
    async def test_events_not_found_returns_404(self, adapter):
        app = _create_runs_app(adapter)
        async with TestClient(TestServer(app)) as cli:
            resp = await cli.get("/v1/runs/run_nonexistent/events")
        assert resp.status == 404

    @pytest.mark.asyncio
    async def test_events_requires_auth(self, auth_adapter):
        app = _create_runs_app(auth_adapter)
        async with TestClient(TestServer(app)) as cli:
            resp = await cli.get("/v1/runs/run_any/events")
        assert resp.status == 401


# ---------------------------------------------------------------------------
# POST /v1/runs/{run_id}/stop — interrupt a running agent
# ---------------------------------------------------------------------------


class TestStopRun:
    @pytest.mark.asyncio
    async def test_stop_running_agent(self, adapter):
        """Stop should interrupt the agent and cancel the task."""
        app = _create_runs_app(adapter)
        async with TestClient(TestServer(app)) as cli:
            with patch.object(adapter, "_create_agent") as mock_create:
                mock_agent, agent_ready, _ = _make_slow_agent()
                mock_create.return_value = mock_agent

                # Start run
                resp = await cli.post("/v1/runs", json={"input": "hello"})
                assert resp.status == 202
                data = await resp.json()
                run_id = data["run_id"]

                # Wait for agent to start running in the thread
                agent_ready.wait(timeout=3.0)
                await asyncio.sleep(0.1)

                # Verify agent ref is stored
                assert run_id in adapter._active_run_agents

                # Stop the run
                stop_resp = await cli.post(f"/v1/runs/{run_id}/stop")
                assert stop_resp.status == 200
                stop_data = await stop_resp.json()
                assert stop_data["run_id"] == run_id
                assert stop_data["status"] == "stopping"

                # Agent interrupt should have been called
                mock_agent.interrupt.assert_called_once_with("Stop requested via API")

                # Refs should be cleaned up
                await asyncio.sleep(0.5)
                assert run_id not in adapter._active_run_agents
                assert run_id not in adapter._active_run_tasks

    @pytest.mark.asyncio
    async def test_stop_nonexistent_run_returns_404(self, adapter):
        app = _create_runs_app(adapter)
        async with TestClient(TestServer(app)) as cli:
            resp = await cli.post("/v1/runs/run_nonexistent/stop")
        assert resp.status == 404

    @pytest.mark.asyncio
    async def test_stop_requires_auth(self, auth_adapter):
        app = _create_runs_app(auth_adapter)
        async with TestClient(TestServer(app)) as cli:
            resp = await cli.post("/v1/runs/run_any/stop")
        assert resp.status == 401

    @pytest.mark.asyncio
    async def test_stop_already_completed_run_returns_404(self, adapter):
        """Stopping a run that already finished should return 404 (refs cleaned up)."""
        app = _create_runs_app(adapter)
        async with TestClient(TestServer(app)) as cli:
            with patch.object(adapter, "_create_agent") as mock_create:
                mock_agent = MagicMock()
                mock_agent.run_conversation.return_value = {"final_response": "done"}
                mock_agent.session_prompt_tokens = 0
                mock_agent.session_completion_tokens = 0
                mock_agent.session_total_tokens = 0
                mock_create.return_value = mock_agent

                # Start and wait for completion
                resp = await cli.post("/v1/runs", json={"input": "hello"})
                assert resp.status == 202
                data = await resp.json()
                run_id = data["run_id"]

                await asyncio.sleep(0.3)

                # Run should be done, refs cleaned up
                assert run_id not in adapter._active_run_agents

                # Stop should return 404
                stop_resp = await cli.post(f"/v1/runs/{run_id}/stop")
                assert stop_resp.status == 404

    @pytest.mark.asyncio
    async def test_stop_interrupt_exception_does_not_crash(self, adapter):
        """If agent.interrupt() raises, stop should still succeed."""
        app = _create_runs_app(adapter)
        async with TestClient(TestServer(app)) as cli:
            with patch.object(adapter, "_create_agent") as mock_create:
                mock_agent, agent_ready, _ = _make_slow_agent()
                # Override the interrupt side_effect to raise
                mock_agent.interrupt = MagicMock(side_effect=RuntimeError("interrupt failed"))
                mock_create.return_value = mock_agent

                resp = await cli.post("/v1/runs", json={"input": "hello"})
                assert resp.status == 202
                data = await resp.json()
                run_id = data["run_id"]

                agent_ready.wait(timeout=3.0)
                await asyncio.sleep(0.1)

                stop_resp = await cli.post(f"/v1/runs/{run_id}/stop")
                assert stop_resp.status == 200
                stop_data = await stop_resp.json()
                assert stop_data["status"] == "stopping"

    @pytest.mark.asyncio
    async def test_stop_sends_sentinel_to_events_stream(self, adapter):
        """After stop, the events stream should close."""
        app = _create_runs_app(adapter)
        async with TestClient(TestServer(app)) as cli:
            with patch.object(adapter, "_create_agent") as mock_create:
                mock_agent, agent_ready, _ = _make_slow_agent()
                mock_create.return_value = mock_agent

                # Start run
                resp = await cli.post("/v1/runs", json={"input": "hello"})
                assert resp.status == 202
                data = await resp.json()
                run_id = data["run_id"]

                agent_ready.wait(timeout=3.0)
                await asyncio.sleep(0.1)

                # Subscribe to events in background
                events_task = asyncio.ensure_future(
                    cli.get(f"/v1/runs/{run_id}/events")
                )

                await asyncio.sleep(0.1)

                # Stop the run
                stop_resp = await cli.post(f"/v1/runs/{run_id}/stop")
                assert stop_resp.status == 200

                # Events stream should close
                events_resp = await asyncio.wait_for(events_task, timeout=5.0)
                assert events_resp.status == 200
                body = await events_resp.text()
                # Stream should have received run.failed and closed
                assert "run.failed" in body or "stream closed" in body