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_config_view_is_read_only_and_does_not_require_approval(self):
        from backend.agent_tools import classify_kubectl_command

        decision = classify_kubectl_command("kubectl config view")

        self.assertEqual(decision.mode, "read")
        self.assertFalse(decision.requires_approval)

    def test_execute_approved_command_continues_agent_with_command_result(self):
        approval = {
            "command": "kubectl rollout restart deployment/api -n prod",
            "reason": "重启工作负载",
            "run_id": "",
            "report": "diagnosis report",
            "question": "修复 API",
            "execution_mode": "ai",
            "messages": [{"role": "system", "content": "context"}],
            "next_step": 2,
            "max_steps": 30,
            "command_counts": {"kubectl rollout restart deployment/api -n prod": 1},
        }

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

        async def fake_resume(pending, result):
            self.assertEqual(result["stdout"], "restarted")
            yield {"type": "thinking", "step": 2, "message": "继续验证"}
            yield {"type": "command", "command": "kubectl get pods -n prod", "mode": "read", "reason": "验证恢复"}
            yield {"type": "result", "command": "kubectl get pods -n prod", "mode": "read", "returncode": 0, "stdout": "Running", "stderr": ""}
            yield {"type": "final", "content": "故障已恢复", "model": "test"}

        async def run():
            with patch.object(main, "take_pending_approval", return_value=approval), patch.object(main, "execute_command", fake_execute), patch.object(main, "resume_diagnostic_agent", fake_resume):
                response = await main.execute_approved_agent_command(main.AgentApprovalRequest(approval_id="abc", approved=True))
                return [parse_sse(event) async for event in response.body_iterator]

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

    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 fake_resume(pending, result):
            yield {"type": "final", "content": "验证完成", "model": "test"}

        async def run():
            with patch.object(main, "take_pending_approval", return_value=approval), patch.object(main, "execute_command", fake_execute), patch.object(main, "resume_diagnostic_agent", fake_resume):
                response = await main.execute_approved_agent_command(main.AgentApprovalRequest(approval_id="abc", approved=True))
                return [parse_sse(event) async for event in response.body_iterator]

        events = asyncio.run(run())
        self.assertEqual(events[0]["type"], "approved_result")
        self.assertEqual(events[0]["returncode"], 0)
        self.assertEqual(events[0]["stdout"], "scaled")
        self.assertEqual(events[-1]["type"], "done")


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