from pathlib import Path

import pytest

from app.service.promotion_image_service import PromotionImageService


def test_background_prompt_forbids_content_reconstruction() -> None:
    prompt = PromotionImageService._build_prompt(
        style_code="balanced_allocation",
        background_theme="data_lines",
        fund_type="混合型",
    )

    assert "不生成任何文字、数字、字母" in prompt
    assert "Logo" in prompt


@pytest.mark.asyncio
async def test_disabled_image_service_returns_none(monkeypatch: pytest.MonkeyPatch) -> None:
    class Settings:
        promotion_image_enabled = False
        promotion_image_base_url = "https://dashscope.aliyuncs.com"
        promotion_image_model = "wan2.2-t2i-flash"
        promotion_image_timeout_seconds = 90
        promotion_image_poll_interval_seconds = 2

    monkeypatch.setattr(
        "app.service.promotion_image_service.get_settings",
        lambda: Settings(),
    )
    service = PromotionImageService()

    result = await service.generate_background(
        output_path=Path("unused.png"),
        style_code="balanced_allocation",
        background_theme="data_lines",
        fund_type="混合型",
    )

    assert result is None