from datetime import datetime

from fastapi.testclient import TestClient

from app.main import app, get_gateway
from app.models import LeaveDraftSuggestion, LeaveDraftSuggestionRequest, LeaveType


class FakeGateway:
    async def suggest(self, request: LeaveDraftSuggestionRequest) -> LeaveDraftSuggestion:
        assert request.text == "明天下午请事假四小时"
        return LeaveDraftSuggestion(
            type=LeaveType.PERSONAL,
            startsAt=datetime.fromisoformat("2026-07-19T13:30:00+08:00"),
            endsAt=datetime.fromisoformat("2026-07-19T17:30:00+08:00"),
            reason="办理个人事务",
            assumptions=["下午按 13:30 开始计算"],
        )


def test_returns_structured_suggestion_without_executing_business_action() -> None:
    app.dependency_overrides[get_gateway] = lambda: FakeGateway()
    try:
        response = TestClient(app).post(
            "/v1/leave-drafts/suggest",
            json={"text": "明天下午请事假四小时", "timezone": "Asia/Shanghai"},
        )
    finally:
        app.dependency_overrides.clear()

    assert response.status_code == 200
    body = response.json()
    assert body["suggestion"]["type"] == "PERSONAL"
    assert body["requiresUserConfirmation"] is True
    assert "applicantId" not in body["suggestion"]


def test_rejects_invalid_time_range_from_model() -> None:
    try:
        LeaveDraftSuggestion(
            startsAt=datetime.fromisoformat("2026-07-19T17:30:00+08:00"),
            endsAt=datetime.fromisoformat("2026-07-19T13:30:00+08:00"),
        )
        assert False, "validation should fail"
    except ValueError:
        pass