"""Tests for ffmpeg proxy view."""

from collections.abc import Generator
from http import HTTPStatus
import io
import os
import tempfile
from unittest.mock import patch
from urllib.request import pathname2url
import wave

from aiohttp import client_exceptions
import mutagen
import pytest

from homeassistant.components import esphome
from homeassistant.components.esphome.ffmpeg_proxy import async_create_proxy_url
from homeassistant.core import HomeAssistant
from homeassistant.setup import async_setup_component

from tests.typing import ClientSessionGenerator


@pytest.fixture(name="wav_file_length")
def wav_file_length_fixture() -> int:
    """Wanted length of temporary wave file."""
    return 1


@pytest.fixture(name="wav_file")
def wav_file_fixture(wav_file_length: int) -> Generator[str]:
    """Create a temporary file and fill it with 1s of silence."""
    with tempfile.NamedTemporaryFile(mode="wb+", suffix=".wav") as temp_file:
        _write_silence(temp_file.name, wav_file_length)
        yield temp_file.name


def _write_silence(filename: str, length: int) -> None:
    """Write silence to a file."""
    with wave.open(filename, "wb") as wav_file:
        wav_file.setframerate(16000)
        wav_file.setsampwidth(2)
        wav_file.setnchannels(1)
        wav_file.writeframes(bytes(16000 * 2 * length))  # length s


async def test_async_create_proxy_url(hass: HomeAssistant) -> None:
    """Test that async_create_proxy_url returns the correct format."""
    assert await async_setup_component(hass, "esphome", {})

    device_id = "test-device"
    convert_id = "test-id"
    media_format = "flac"
    media_url = "http://127.0.0.1/test.mp3"
    proxy_url = f"/api/esphome/ffmpeg_proxy/{device_id}/{convert_id}.{media_format}"

    with patch(
        "homeassistant.components.esphome.ffmpeg_proxy.secrets.token_urlsafe",
        return_value=convert_id,
    ):
        assert (
            async_create_proxy_url(hass, device_id, media_url, media_format)
            == proxy_url
        )


async def test_proxy_view(
    hass: HomeAssistant,
    hass_client: ClientSessionGenerator,
    wav_file: str,
) -> None:
    """Test proxy HTTP view for converting audio."""
    device_id = "1234"

    await async_setup_component(hass, esphome.DOMAIN, {esphome.DOMAIN: {}})
    client = await hass_client()

    wav_url = pathname2url(wav_file)
    convert_id = "test-id"
    url = f"/api/esphome/ffmpeg_proxy/{device_id}/{convert_id}.mp3"

    # Should fail because we haven't allowed the URL yet
    req = await client.get(url)
    assert req.status == HTTPStatus.NOT_FOUND

    # Allow the URL
    with patch(
        "homeassistant.components.esphome.ffmpeg_proxy.secrets.token_urlsafe",
        return_value=convert_id,
    ):
        assert (
            async_create_proxy_url(
                hass, device_id, wav_url, media_format="mp3", rate=22050, channels=2
            )
            == url
        )

    # Requesting the wrong media format should fail
    wrong_url = f"/api/esphome/ffmpeg_proxy/{device_id}/{convert_id}.flac"
    req = await client.get(wrong_url)
    assert req.status == HTTPStatus.BAD_REQUEST

    # Correct URL
    req = await client.get(url)
    assert req.status == HTTPStatus.OK

    mp3_data = await req.content.read()

    # Verify conversion
    with io.BytesIO(mp3_data) as mp3_io:
        mp3_file = mutagen.File(mp3_io)
        assert mp3_file.info.sample_rate == 22050
        assert mp3_file.info.channels == 2

        # About a second, but not exact
        assert round(mp3_file.info.length, 0) == 1


async def test_ffmpeg_file_doesnt_exist(
    hass: HomeAssistant,
    hass_client: ClientSessionGenerator,
) -> None:
    """Test ffmpeg conversion with a file that doesn't exist."""
    device_id = "1234"

    await async_setup_component(hass, esphome.DOMAIN, {esphome.DOMAIN: {}})
    client = await hass_client()

    # Try to convert a file that doesn't exist
    url = async_create_proxy_url(hass, device_id, "missing-file", media_format="mp3")
    req = await client.get(url)

    # The HTTP status is OK because the ffmpeg process started, but no data is
    # returned.
    assert req.status == HTTPStatus.OK
    mp3_data = await req.content.read()
    assert not mp3_data


async def test_lingering_process(
    hass: HomeAssistant,
    hass_client: ClientSessionGenerator,
    wav_file: str,
) -> None:
    """Test that a new request stops the old ffmpeg process."""
    device_id = "1234"

    await async_setup_component(hass, esphome.DOMAIN, {esphome.DOMAIN: {}})
    client = await hass_client()

    wav_url = pathname2url(wav_file)
    url1 = async_create_proxy_url(
        hass,
        device_id,
        wav_url,
        media_format="wav",
        rate=22050,
        channels=2,
        width=2,
    )

    # First request will start ffmpeg
    req1 = await client.get(url1)
    assert req1.status == HTTPStatus.OK

    # Only read part of the data
    await req1.content.readexactly(100)

    # Allow another URL
    url2 = async_create_proxy_url(
        hass,
        device_id,
        wav_url,
        media_format="wav",
        rate=22050,
        channels=2,
        width=2,
    )

    req2 = await client.get(url2)
    assert req2.status == HTTPStatus.OK

    wav_data = await req2.content.read()

    # All of the data should be there because this is a new ffmpeg process
    with io.BytesIO(wav_data) as wav_io, wave.open(wav_io, "rb") as received_wav_file:
        # We can't use getnframes() here because the WAV header will be incorrect.
        # WAV encoders usually go back and update the WAV header after all of
        # the frames are written, but ffmpeg can't do that because we're
        # streaming the data.
        # So instead, we just read and count frames until we run out.
        num_frames = 0
        while chunk := received_wav_file.readframes(1024):
            num_frames += len(chunk) // (2 * 2)  # 2 channels, 16-bit samples

        assert num_frames == 22050  # 1s


@pytest.mark.parametrize("wav_file_length", [10])
async def test_request_same_url_multiple_times(
    hass: HomeAssistant,
    hass_client: ClientSessionGenerator,
    wav_file: str,
) -> None:
    """Test that the ffmpeg process is restarted if the same URL is requested multiple times."""
    device_id = "1234"

    await async_setup_component(hass, esphome.DOMAIN, {esphome.DOMAIN: {}})
    client = await hass_client()

    wav_url = pathname2url(wav_file)
    url = async_create_proxy_url(
        hass,
        device_id,
        wav_url,
        media_format="wav",
        rate=22050,
        channels=2,
        width=2,
    )

    # First request will start ffmpeg
    req1 = await client.get(url)
    assert req1.status == HTTPStatus.OK

    # Only read part of the data
    await req1.content.readexactly(100)

    # Second request should restart ffmpeg
    req2 = await client.get(url)
    assert req2.status == HTTPStatus.OK

    wav_data = await req2.content.read()

    # All of the data should be there because this is a new ffmpeg process
    with io.BytesIO(wav_data) as wav_io, wave.open(wav_io, "rb") as received_wav_file:
        num_frames = 0
        while chunk := received_wav_file.readframes(1024):
            num_frames += len(chunk) // (2 * 2)  # 2 channels, 16-bit samples

        assert num_frames == 22050 * 10  # 10s


async def test_max_conversions_per_device(
    hass: HomeAssistant,
    hass_client: ClientSessionGenerator,
) -> None:
    """Test that each device has a maximum number of conversions (currently 2)."""
    max_conversions = 2
    device_ids = ["1234", "5678"]

    await async_setup_component(hass, esphome.DOMAIN, {esphome.DOMAIN: {}})
    client = await hass_client()

    with tempfile.TemporaryDirectory() as temp_dir:
        wav_paths = [
            os.path.join(temp_dir, f"{i}.wav") for i in range(max_conversions + 1)
        ]
        for wav_path in wav_paths:
            _write_silence(wav_path, 10)

        wav_urls = [pathname2url(p) for p in wav_paths]

        # Each device will have max + 1 conversions
        device_urls = {
            device_id: [
                async_create_proxy_url(
                    hass,
                    device_id,
                    wav_url,
                    media_format="wav",
                    rate=22050,
                    channels=2,
                    width=2,
                )
                for wav_url in wav_urls
            ]
            for device_id in device_ids
        }

        for urls in device_urls.values():
            # First URL should fail because it was overwritten by the others
            req = await client.get(urls[0])
            assert req.status == HTTPStatus.BAD_REQUEST

            # All other URLs should succeed
            for url in urls[1:]:
                req = await client.get(url)
                assert req.status == HTTPStatus.OK


async def test_abort_on_shutdown(
    hass: HomeAssistant,
    hass_client: ClientSessionGenerator,
) -> None:
    """Test we abort on Home Assistant shutdown."""
    device_id = "1234"

    await async_setup_component(hass, esphome.DOMAIN, {esphome.DOMAIN: {}})
    client = await hass_client()

    with tempfile.NamedTemporaryFile(mode="wb+", suffix=".wav") as temp_file:
        with wave.open(temp_file.name, "wb") as wav_file:
            wav_file.setframerate(16000)
            wav_file.setsampwidth(2)
            wav_file.setnchannels(1)
            wav_file.writeframes(bytes(16000 * 2))  # 1s

        wav_url = pathname2url(temp_file.name)
        convert_id = "test-id"
        url = f"/api/esphome/ffmpeg_proxy/{device_id}/{convert_id}.mp3"

        wav_url = pathname2url(temp_file.name)
        url = async_create_proxy_url(
            hass,
            device_id,
            wav_url,
            media_format="wav",
            rate=22050,
            channels=2,
            width=2,
        )

        # Get URL and start reading
        req = await client.get(url)
        assert req.status == HTTPStatus.OK
        initial_mp3_data = await req.content.read(4)
        assert initial_mp3_data == b"RIFF"

        # Shut down Home Assistant
        await hass.async_stop()

        with pytest.raises(client_exceptions.ClientPayloadError):
            await req.content.read()