"""Phase 2 tests: Video upload endpoint.

Covers:
- POST /api/v1/video/upload with size validation (<300MB)
- Format validation (MP4 and common formats)
- Static file serving
- Error handling for oversized/invalid files
"""
import pytest
from fastapi import FastAPI
from fastapi.testclient import TestClient


@pytest.fixture
def video_client(tmp_path, monkeypatch):
    upload_dir = tmp_path / "test_uploads"
    upload_dir.mkdir()
    monkeypatch.setenv("VIDEO_UPLOAD_DIR", str(upload_dir))
    monkeypatch.setenv("MAX_VIDEO_SIZE_MB", "10")

    from app.routers.video import router
    from app.core.config import get_settings

    get_settings.cache_clear()
    app = FastAPI()
    app.include_router(router, prefix="/api/v1")
    return TestClient(app), upload_dir


class TestVideoUpload:
    def test_upload_mp4_success(self, video_client):
        client, upload_dir = video_client
        content = b"\x00" * 1024 * 100  # 100KB dummy data
        resp = client.post(
            "/api/v1/video/upload",
            files={"file": ("test.mp4", content, "video/mp4")},
        )
        assert resp.status_code == 200
        data = resp.json()
        assert "video_id" in data
        assert data["filename"] == "test.mp4"
        assert data["size_bytes"] == 102400
        assert data["url"].startswith("/api/v1/video/")
        assert len(list(upload_dir.glob("*"))) == 1

    def test_upload_size_limit(self, video_client):
        client, upload_dir = video_client
        content = b"\x00" * (11 * 1024 * 1024)  # 11MB, limit is 10MB
        resp = client.post(
            "/api/v1/video/upload",
            files={"file": ("big.mp4", content, "video/mp4")},
        )
        assert resp.status_code == 413
        assert len(list(upload_dir.glob("*"))) == 0

    def test_upload_invalid_format(self, video_client):
        client, upload_dir = video_client
        content = b"hello world"
        resp = client.post(
            "/api/v1/video/upload",
            files={"file": ("doc.txt", content, "text/plain")},
        )
        assert resp.status_code == 400
        assert "Unsupported format" in resp.json()["detail"]

    def test_static_file_serving(self, video_client):
        client, upload_dir = video_client
        content = b"\x00" * 512
        resp = client.post(
            "/api/v1/video/upload",
            files={"file": ("serve_test.mp4", content, "video/mp4")},
        )
        assert resp.status_code == 200
        video_id = resp.json()["video_id"]

        resp = client.get(f"/api/v1/video/{video_id}")
        assert resp.status_code == 200
        assert resp.headers["content-type"] == "video/mp4"
        assert resp.content == content

    def test_unknown_video_returns_404(self, video_client):
        client, _ = video_client
        resp = client.get("/api/v1/video/nonexistent")
        assert resp.status_code == 404