import asyncio
import json
import unittest
from unittest.mock import patch

import backend.main as main


def parse_sse(event):
    return json.loads(event[6:].strip())


class AgentApiTest(unittest.TestCase):
    def test_agent_stream_forwards_agent_events(self):
        async def fake_agent(report, question="", max_steps=6, execution_mode="ai"):
            self.assertEqual(execution_mode, "manual")
            yield {"type": "thinking", "step": 1, "message": "规划"}
            yield {"type": "final", "content": "完成"}

        async def run():
            main._last_diagnosis = {"score": 60}
            main._last_report = "report"
            with patch.object(main, "run_diagnostic_agent", fake_agent):
                response = await main.agent_diagnose_stream(question="检查 Pod", execution_mode="manual")
                return [parse_sse(event) async for event in response.body_iterator]

        events = asyncio.run(run())
        self.assertEqual(events[0]["type"], "start")
        self.assertEqual(events[-1]["type"], "done")
        self.assertEqual(events[-2]["type"], "final")

    def test_execute_approved_command_once(self):
        approval = {"command": "kubectl scale deployment/api --replicas=2", "reason": "恢复副本"}

        async def fake_execute(command):
            return {"command": command, "mode": "write", "returncode": 0, "stdout": "scaled", "stderr": ""}

        async def run():
            with patch.object(main, "take_pending_approval", return_value=approval), patch.object(main, "execute_kubectl", fake_execute):
                return await main.execute_approved_agent_command(main.AgentApprovalRequest(approval_id="abc", approved=True))

        result = asyncio.run(run())
        self.assertEqual(result["returncode"], 0)
        self.assertEqual(result["stdout"], "scaled")


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