import pytest
from fastapi import HTTPException
from app.services.storage import save_upload, delete_files
from app.services.storage_backend import LocalStorage, S3Storage
from unittest.mock import MagicMock, patch, AsyncMock
import io

@pytest.mark.asyncio
async def test_save_upload_unsupported_mime():
    mock_file = MagicMock()
    mock_file.content_type = "text/plain"
    with pytest.raises(HTTPException) as exc:
        await save_upload(mock_file, "client_id")
    assert exc.value.status_code == 415

@pytest.mark.asyncio
@patch("app.services.storage.settings")
async def test_save_upload_too_large(mock_settings):
    mock_settings.max_upload_bytes = 10
    mock_settings.MAX_UPLOAD_SIZE_MB = 10
    mock_file = MagicMock()
    mock_file.content_type = "image/jpeg"
    mock_file.read = AsyncMock(return_value=b"a" * 20)
    with pytest.raises(HTTPException) as exc:
        await save_upload(mock_file, "client_id")
    assert exc.value.status_code == 413

@pytest.mark.asyncio
async def test_delete_files_exists(tmp_path):
    f1 = tmp_path / "f1.txt"
    f1.write_text("hello")
    f2 = tmp_path / "f2.txt"
    f2.write_text("world")
    
    assert f1.exists()
    assert f2.exists()

    await delete_files(str(f1), str(f2))
    
    assert not f1.exists()
    assert not f2.exists()

@pytest.mark.asyncio
async def test_get_signed_url():
    storage = LocalStorage("/", "test_secret")
    url = await storage.get_signed_url("uploads/client1/img.jpg")
    assert url.startswith("/files/signed/")