# test_aider_event_processor | 2026-04-20 @ Asia/Taipei
"""Unit tests for AiderEventProcessor."""
import pytest
import json
from datetime import datetime, timezone, timedelta
from unittest.mock import AsyncMock, MagicMock, patch
from src.workers.aider_event_processor import AiderEventProcessor


TAIPEI = timezone(timedelta(hours=8))


def _payload_dict():
    """基本的 aider event payload。"""
    return {
        "ts": datetime.now(TAIPEI).isoformat(),
        "session_id": "s1", "host": "ogt-mac",
        "type": "error",
        "payload": {"cwd": "/r", "model": "elephant-alpha",
                    "kind": "api_rate_limit", "message": "429",
                    "context_50chars": ""},
    }


@pytest.mark.asyncio
async def test_process_one_error_event_creates_incident_and_writes_db(monkeypatch):
    """error event 應建 incident + 寫 DB。"""
    # Mock incident engine
    fake_incident = MagicMock()
    fake_incident.incident_id = "inc-123"
    fake_engine = MagicMock()
    fake_engine.process_signal = AsyncMock(return_value=fake_incident)
    monkeypatch.setattr("src.workers.aider_event_processor.get_incident_engine",
                        lambda: fake_engine)

    # Mock DB session factory + repo
    inserted = {}
    class FakeRepo:
        def __init__(self, sess): pass
        async def insert(self, **kw): inserted.update(kw); return 1
    class FakeSession:
        async def __aenter__(self): return self
        async def __aexit__(self, *a): return False
        async def commit(self): pass
    monkeypatch.setattr("src.workers.aider_event_processor.AiderEventRepository",
                        FakeRepo)
    monkeypatch.setattr("src.workers.aider_event_processor.get_session_factory",
                        lambda: (lambda: FakeSession()))

    # Mock redis ack
    fake_r = MagicMock()
    fake_r.xack = AsyncMock()
    monkeypatch.setattr("src.workers.aider_event_processor.get_worker_redis",
                        lambda: fake_r)

    # Act
    proc = AiderEventProcessor()
    payload = _payload_dict()
    data = {b"payload": json.dumps(payload).encode()}
    await proc._process_one("stream", "1-0", data)

    # Assert
    assert fake_engine.process_signal.called
    assert inserted.get("incident_id") == "inc-123"
    assert inserted.get("type_") == "error"
    fake_r.xack.assert_called_once()


@pytest.mark.asyncio
async def test_process_one_session_start_no_incident(monkeypatch):
    """session_start 不應建 incident，但應寫 DB。"""
    fake_engine = MagicMock()
    fake_engine.process_signal = AsyncMock()
    monkeypatch.setattr("src.workers.aider_event_processor.get_incident_engine",
                        lambda: fake_engine)

    inserted = {}
    class FakeRepo:
        def __init__(self, sess): pass
        async def insert(self, **kw): inserted.update(kw); return 1
    class FakeSession:
        async def __aenter__(self): return self
        async def __aexit__(self, *a): return False
        async def commit(self): pass
    monkeypatch.setattr("src.workers.aider_event_processor.AiderEventRepository",
                        FakeRepo)
    monkeypatch.setattr("src.workers.aider_event_processor.get_session_factory",
                        lambda: (lambda: FakeSession()))

    fake_r = MagicMock()
    fake_r.xack = AsyncMock()
    monkeypatch.setattr("src.workers.aider_event_processor.get_worker_redis",
                        lambda: fake_r)

    # Act
    proc = AiderEventProcessor()
    payload = _payload_dict()
    payload["type"] = "session_start"
    payload["payload"] = {"cwd": "/r", "model": "m", "aider_args": [],
                          "aider_pid": 1, "cli_version": "0"}
    data = {b"payload": json.dumps(payload).encode()}
    await proc._process_one("stream", "1-0", data)

    # Assert
    assert not fake_engine.process_signal.called  # session_start 不建 incident
    assert inserted.get("incident_id") is None    # DB 依然寫入
    assert inserted.get("type_") == "session_start"
    fake_r.xack.assert_called_once()


@pytest.mark.asyncio
async def test_process_one_malformed_payload_acks_and_skips(monkeypatch, caplog):
    """malformed JSON 應 ACK 避免卡 pending，但不建 DB record。"""
    fake_r = MagicMock()
    fake_r.xack = AsyncMock()
    monkeypatch.setattr("src.workers.aider_event_processor.get_worker_redis",
                        lambda: fake_r)

    # Act
    proc = AiderEventProcessor()
    data = {b"payload": b"this is not json"}
    await proc._process_one("stream", "1-0", data)

    # Assert
    fake_r.xack.assert_called_once()  # 壞 payload ACK 避免卡 pending


@pytest.mark.asyncio
async def test_incident_failure_still_writes_db(monkeypatch):
    """incident engine 壞掉時，event 仍要進 DB（不丟資料）。"""
    fake_engine = MagicMock()
    fake_engine.process_signal = AsyncMock(side_effect=RuntimeError("engine down"))
    monkeypatch.setattr("src.workers.aider_event_processor.get_incident_engine",
                        lambda: fake_engine)

    inserted = {}
    class FakeRepo:
        def __init__(self, sess): pass
        async def insert(self, **kw): inserted.update(kw); return 1
    class FakeSession:
        async def __aenter__(self): return self
        async def __aexit__(self, *a): return False
        async def commit(self): pass
    monkeypatch.setattr("src.workers.aider_event_processor.AiderEventRepository",
                        FakeRepo)
    monkeypatch.setattr("src.workers.aider_event_processor.get_session_factory",
                        lambda: (lambda: FakeSession()))

    fake_r = MagicMock()
    fake_r.xack = AsyncMock()
    monkeypatch.setattr("src.workers.aider_event_processor.get_worker_redis",
                        lambda: fake_r)

    # Act
    proc = AiderEventProcessor()
    payload = _payload_dict()
    data = {b"payload": json.dumps(payload).encode()}
    await proc._process_one("stream", "1-0", data)

    # Assert
    assert inserted.get("type_") == "error"
    assert inserted.get("incident_id") is None  # engine 壞，無 id
    fake_r.xack.assert_called_once()            # 仍 ACK