"""Tests for /api/analyze endpoint."""

from __future__ import annotations

import io
import struct
import math

from fastapi.testclient import TestClient


def test_analyze_missing_source_type(
    client: TestClient,
) -> None:
    """Reject request without sourceType."""
    response = client.post("/api/analyze")
    assert response.status_code == 422


def test_analyze_invalid_source_type(
    client: TestClient,
) -> None:
    """Return error for unknown sourceType."""
    response = client.post(
        "/api/analyze",
        data={"sourceType": "unknown"},
    )
    assert response.status_code == 200
    data = response.json()
    assert "invalid_source_type" in data["errors"]
    assert data["result"] is None


def test_analyze_unsupported_source(
    client: TestClient,
) -> None:
    """Return unsupported_source for spotify/apple."""
    for source in ("spotify", "apple"):
        response = client.post(
            "/api/analyze",
            data={"sourceType": source},
        )
        assert response.status_code == 200
        data = response.json()
        assert "unsupported_source" in data["errors"]


def test_analyze_youtube_missing_url(
    client: TestClient,
) -> None:
    """YouTube without url returns missing_url."""
    response = client.post(
        "/api/analyze",
        data={"sourceType": "youtube"},
    )
    assert response.status_code == 200
    data = response.json()
    assert "missing_url" in data["errors"]


def test_analyze_file_missing_file(
    client: TestClient,
) -> None:
    """File without upload returns missing_file."""
    response = client.post(
        "/api/analyze",
        data={"sourceType": "file"},
    )
    assert response.status_code == 200
    data = response.json()
    assert "missing_file" in data["errors"]


def test_analyze_file_invalid_type(
    client: TestClient,
) -> None:
    """Reject non-audio file."""
    fake_file = io.BytesIO(b"not audio content " * 100)
    response = client.post(
        "/api/analyze",
        data={"sourceType": "file"},
        files={
            "file": ("test.txt", fake_file, "text/plain"),
        },
    )
    assert response.status_code == 200
    data = response.json()
    assert "invalid_file_type" in data["errors"]


def test_analyze_file_too_small(
    client: TestClient,
) -> None:
    """Reject files smaller than 1KB."""
    tiny_file = io.BytesIO(b"\x00" * 100)
    response = client.post(
        "/api/analyze",
        data={"sourceType": "file"},
        files={
            "file": ("tiny.wav", tiny_file, "audio/wav"),
        },
    )
    assert response.status_code == 200
    data = response.json()
    assert "file_too_small" in data["errors"]


def test_analyze_file_fallback_on_bad_audio(
    client: TestClient,
) -> None:
    """Non-parseable audio falls back to preview model."""
    audio_content = b"\x00" * 2048
    fake_audio = io.BytesIO(audio_content)
    response = client.post(
        "/api/analyze",
        data={"sourceType": "file"},
        files={
            "file": ("test.wav", fake_audio, "audio/wav"),
        },
    )
    assert response.status_code == 200
    data = response.json()
    assert data["result"] is not None
    result = data["result"]
    assert "isAIGenerated" in result
    assert "confidence" in result
    # Bad audio triggers fallback to preview
    assert result["analysisMode"] == "preview"
    assert result["decisionSource"] == "preview"


def _make_wav(
    duration_sec: float = 3.0,
    freq_hz: float = 440.0,
    sample_rate: int = 22050,
) -> bytes:
    """
    Generate a minimal valid WAV file with a sine tone.

    Returns raw bytes of a valid WAV.
    """
    n_samples = int(sample_rate * duration_sec)
    samples = []
    for i in range(n_samples):
        t = i / sample_rate
        val = math.sin(2 * math.pi * freq_hz * t)
        samples.append(int(val * 32767))

    # WAV header (16-bit mono PCM)
    data_size = n_samples * 2
    buf = io.BytesIO()
    # RIFF header
    buf.write(b"RIFF")
    buf.write(struct.pack("<I", 36 + data_size))
    buf.write(b"WAVE")
    # fmt chunk
    buf.write(b"fmt ")
    buf.write(struct.pack("<I", 16))       # chunk size
    buf.write(struct.pack("<H", 1))        # PCM
    buf.write(struct.pack("<H", 1))        # mono
    buf.write(struct.pack("<I", sample_rate))
    buf.write(struct.pack("<I", sample_rate * 2))  # byte rate
    buf.write(struct.pack("<H", 2))        # block align
    buf.write(struct.pack("<H", 16))       # bits per sample
    # data chunk
    buf.write(b"data")
    buf.write(struct.pack("<I", data_size))
    for s in samples:
        buf.write(struct.pack("<h", s))

    return buf.getvalue()


def test_analyze_file_real_audio(
    client: TestClient,
) -> None:
    """
    Real WAV audio triggers the full analysis pipeline.

    Expects production mode with feature extraction
    and score fusion (not preview fallback).
    """
    wav_bytes = _make_wav(duration_sec=3.0, freq_hz=440.0)
    audio_file = io.BytesIO(wav_bytes)

    response = client.post(
        "/api/analyze",
        data={"sourceType": "file"},
        files={
            "file": (
                "tone.wav", audio_file, "audio/wav",
            ),
        },
    )
    assert response.status_code == 200
    data = response.json()
    assert data["result"] is not None

    result = data["result"]

    # Should use real analysis, not preview fallback
    assert result["analysisMode"] == "production"
    assert result["decisionSource"].startswith("auris_")
    assert result["modelVersion"] == "auris-v1-fusion"

    # Confidence in valid range
    assert 0.51 <= result["confidence"] <= 0.97

    # Features should have real values
    feat = result["features"]
    assert 0.0 <= feat["spectralRegularity"] <= 0.99
    assert 0.0 <= feat["temporalPatterns"] <= 0.99
    assert 0.0 <= feat["harmonicStructure"] <= 0.99

    # Audio info should reflect our input
    info = result["audioInfo"]
    assert info["duration"] > 2.0
    assert info["sampleRate"] == 22050

    # Indicators should be populated
    assert len(feat["artificialIndicators"]) > 0


def test_analyze_file_real_audio_has_processing_time(
    client: TestClient,
) -> None:
    """Processing time should be realistic."""
    wav_bytes = _make_wav(duration_sec=2.0, freq_hz=220.0)
    audio_file = io.BytesIO(wav_bytes)

    response = client.post(
        "/api/analyze",
        data={"sourceType": "file"},
        files={
            "file": (
                "test2.wav", audio_file, "audio/wav",
            ),
        },
    )
    data = response.json()
    assert data["result"] is not None
    # Should complete in reasonable time
    assert data["result"]["processingTime"] < 30.0
    assert data["result"]["processingTime"] > 0.0