"""
LectureLens — Tests: API Integration
Run with: pytest tests/test_api.py -v
Requires all dependencies installed (no Docker).
"""

from __future__ import annotations

import io
import time
import wave

import numpy as np
import pytest
from fastapi.testclient import TestClient

from app.main import app


# ── Fixtures ───────────────────────────────────────────────────────────────────

@pytest.fixture(scope="module")
def client():
    with TestClient(app) as c:
        yield c


@pytest.fixture(scope="module")
def wav_bytes() -> bytes:
    """Minimal 2-second sine WAV in memory."""
    sr = 16_000
    duration = 2
    t = np.linspace(0, duration, sr * duration, endpoint=False)
    samples = (np.sin(2 * np.pi * 440 * t) * 0.3 * 32767).astype(np.int16)
    buf = io.BytesIO()
    with wave.open(buf, "w") as wf:
        wf.setnchannels(1)
        wf.setsampwidth(2)
        wf.setframerate(sr)
        wf.writeframes(samples.tobytes())
    return buf.getvalue()


# ── Health ─────────────────────────────────────────────────────────────────────

def test_health(client):
    r = client.get("/health")
    assert r.status_code == 200
    assert r.json()["status"] == "ok"


# ── Polling Analysis ───────────────────────────────────────────────────────────

def test_audio_analysis_polling(client, wav_bytes):
    # 1. Submit the job
    r = client.post(
        "/analyze",
        data={"media_type": "audio", "participant_label": "test_speaker"},
        files={"file": ("test.wav", wav_bytes, "audio/wav")},
    )
    assert r.status_code == 200, r.text
    submit_body = r.json()
    assert submit_body["status"] == "processing"
    assert "job_id" in submit_body
    job_id = submit_body["job_id"]

    # 2. Poll for the result
    for _ in range(10):
        r_poll = client.get(f"/analyze/{job_id}")
        assert r_poll.status_code == 200
        poll_body = r_poll.json()
        
        # TestClient actually runs BackgroundTasks synchronously at the end of the request.
        # So by the time we poll, it's usually already 'completed'.
        if poll_body["status"] == "completed":
            res = poll_body["result"]
            assert res["media_type"] == "audio"
            assert res["participant_label"] == "test_speaker"
            assert "audio_metrics" in res
            assert res["audio_metrics"] is not None
            assert res["video_metrics"] is None
            assert "alerts" in res
            assert res["overall_audio_score"] is not None
            break
        elif poll_body["status"] == "failed":
            pytest.fail(f"Job failed: {poll_body['error_detail']}")
            
        time.sleep(0.5)
    else:
        pytest.fail("Job did not complete within timeout")


# ── Validation ─────────────────────────────────────────────────────────────────

def test_wrong_extension_returns_400(client, wav_bytes):
    r = client.post(
        "/analyze",
        data={"media_type": "video"},  # declare video but send .wav
        files={"file": ("test.wav", wav_bytes, "audio/wav")},
    )
    assert r.status_code == 400
    assert r.json()["error_code"] == "INVALID_MEDIA_TYPE"


def test_job_not_found(client):
    r = client.get("/analyze/non-existent-job-id")
    assert r.status_code == 404
    assert r.json()["error_code"] == "NOT_FOUND"


def test_docs_accessible(client):
    r = client.get("/docs")
    assert r.status_code == 200