"""单图导出响应头回归测试。"""
from __future__ import annotations

import sys
import unittest
from pathlib import Path
from unittest.mock import AsyncMock, patch

SERVER_DIR = Path(__file__).resolve().parents[1]
if str(SERVER_DIR) not in sys.path:
    sys.path.insert(0, str(SERVER_DIR))

from api.export import ExportImageItem, export_image


class ExportImageTests(unittest.IsolatedAsyncioTestCase):
    async def test_chinese_filename_uses_rfc5987_header(self) -> None:
        image = ExportImageItem(
            url="https://example.com/image.png",
            key="尺寸标注图",
            variantName="蓝色",
        )
        with patch("api.export._download", new=AsyncMock(return_value=(b"image", "image/png"))):
            response = await export_image(image)

        disposition = response.headers["content-disposition"]
        self.assertIn('filename="_____-__.png"', disposition)
        self.assertIn("filename*=UTF-8''%E5%B0%BA%E5%AF%B8%E6%A0%87%E6%B3%A8%E5%9B%BE-%E8%93%9D%E8%89%B2.png", disposition)


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