import os
import pytest
import respx
from httpx import Response
from app.pipeline import background, storage


@pytest.fixture
def tmp_storage(monkeypatch, tmp_path):
    monkeypatch.setattr(storage, "VIDEO_DATA_DIR", str(tmp_path))
    return tmp_path


@pytest.mark.asyncio
@respx.mock
async def test_fetch_video_loop_success(tmp_storage, monkeypatch):
    monkeypatch.setenv("PEXELS_API_KEY", "k")
    video_url = "https://videos.pexels.com/video-files/123/sample.mp4"
    respx.get("https://api.pexels.com/videos/search").mock(
        return_value=Response(200, json={
            "videos": [{
                "id": 123, "duration": 10,
                "video_files": [
                    {"quality": "hd", "width": 1920, "link": video_url},
                ],
            }],
        })
    )
    respx.get(video_url).mock(return_value=Response(200, content=b"\x00" * 4096))

    result = await background.fetch_video_loop(pipeline_id=10, keyword="rainy window")
    assert result["used_fallback"] is False
    assert (tmp_storage / "10" / "loop.mp4").exists()


@pytest.mark.asyncio
async def test_fetch_video_loop_no_api_key(tmp_storage, monkeypatch):
    monkeypatch.delenv("PEXELS_API_KEY", raising=False)
    result = await background.fetch_video_loop(pipeline_id=11, keyword="rain")
    assert result["used_fallback"] is True


@pytest.mark.asyncio
@respx.mock
async def test_fetch_video_loop_zero_results(tmp_storage, monkeypatch):
    monkeypatch.setenv("PEXELS_API_KEY", "k")
    respx.get("https://api.pexels.com/videos/search").mock(
        return_value=Response(200, json={"videos": []})
    )
    result = await background.fetch_video_loop(pipeline_id=12, keyword="impossible-keyword")
    assert result["used_fallback"] is True