"""The IR remote's number-key mapping, over the REST API."""

from __future__ import annotations

from collections.abc import AsyncIterator
from pathlib import Path

import httpx2
import pytest

from musicmouse.config import RemoteSlotConfig, WebConfig, load_config
from musicmouse.services.web.service import build_app
from musicmouse.simulator.harness import Simulation, build_simulation
from tests.conftest import VALID_CONFIG, write_config

#: A config file with comments, to prove saving does not flatten them.
COMMENTED = """\
# The MusicMouse config.
general:
  library:
    root: music
    cache: .cache
  serial_port: "/dev/ttyUSB0"
  alsa_device: simulate
  min_volume: 0
  max_volume: 60
  initial_volume: 40

figures:
  fuchs:
    id: "04a1b2c3d4"
    colors: ["#ff6600", "#ffcc00", "#331100", "wff"]
  eule:
    id: "04b2c3d4e5"
    colors: ["#3355ff", "#66aaff", "#001133", "#ffffff"]
"""


@pytest.fixture
async def sim(config_dir: Path) -> AsyncIterator[Simulation]:
    config = load_config(write_config(config_dir, VALID_CONFIG))
    simulation = await build_simulation(config)
    try:
        yield simulation
    finally:
        await simulation.aclose()


@pytest.fixture
async def client(sim: Simulation, config_dir: Path) -> AsyncIterator[httpx2.AsyncClient]:
    path = config_dir / "config.yml"
    path.write_text(COMMENTED, encoding="utf-8")
    api, hub = build_app(sim.app, WebConfig(), path)
    hub.start()
    transport = httpx2.ASGITransport(app=api)
    try:
        async with httpx2.AsyncClient(transport=transport, base_url="http://mouse") as http:
            yield http
    finally:
        hub.stop()
        await api.state.ha_client.aclose()


async def album_id(sim: Simulation, title: str) -> str:
    return next(a.id for a in sim.app.library.albums if a.title == title)


# ------------------------------------------------------------------------------ lirc


async def test_lirc_is_a_404_when_unconfigured(client: httpx2.AsyncClient) -> None:
    assert (await client.get("/api/lirc")).status_code == 404


# --------------------------------------------------------------------------- reading


async def test_the_mapping_is_empty_by_default(client: httpx2.AsyncClient) -> None:
    body = (await client.get("/api/remote/mapping")).json()
    assert body["slots"] == []


# --------------------------------------------------------------------------- writing


async def test_saving_an_album_slot_round_trips(
    client: httpx2.AsyncClient, sim: Simulation, config_dir: Path
) -> None:
    target = await album_id(sim, "Kinderparty Lieder")
    response = await client.put(
        "/api/remote/mapping", json={"slots": {"3": {"target_kind": "album", "target": target}}}
    )
    assert response.status_code == 200
    slots = response.json()["slots"]
    assert slots == [
        {
            "digit": "3",
            "target_kind": "album",
            "target": target,
            "resolved_album_id": target,
            "track_index": 0,
        }
    ]

    text = (config_dir / "config.yml").read_text(encoding="utf-8")
    assert "# The MusicMouse config." in text  # comments survive
    reloaded = load_config(config_dir / "config.yml")
    assert reloaded.remote["3"].target == target
    assert "track_index" not in text  # a whole-album slot reads as it always did


async def test_saving_a_song_slot_round_trips(
    client: httpx2.AsyncClient, sim: Simulation, config_dir: Path
) -> None:
    target = await album_id(sim, "Kinderparty Lieder")
    response = await client.put(
        "/api/remote/mapping",
        json={"slots": {"4": {"target_kind": "album", "target": target, "track_index": 1}}},
    )
    assert response.status_code == 200
    assert response.json()["slots"][0]["track_index"] == 1
    assert (await client.get("/api/remote/mapping")).json()["slots"][0]["track_index"] == 1
    assert sim.app.config.remote["4"].track_index == 1

    reloaded = load_config(config_dir / "config.yml")
    assert reloaded.remote["4"].track_index == 1


async def test_a_song_past_the_end_of_the_album_is_rejected(
    client: httpx2.AsyncClient, sim: Simulation
) -> None:
    target = await album_id(sim, "Kinderparty Lieder")
    response = await client.put(
        "/api/remote/mapping",
        json={"slots": {"4": {"target_kind": "album", "target": target, "track_index": 2}}},
    )
    assert response.status_code == 422
    assert "no track 2" in response.json()["detail"]


async def test_a_song_of_a_series_is_rejected(client: httpx2.AsyncClient) -> None:
    response = await client.put(
        "/api/remote/mapping",
        json={
            "slots": {
                "7": {"target_kind": "series", "target": "Wissen macht Ah", "track_index": 1}
            }
        },
    )
    assert response.status_code == 422


# --------------------------------------------------------------------------- pressing


async def test_pressing_a_key_plays_its_song_and_then_the_rest(
    client: httpx2.AsyncClient, sim: Simulation
) -> None:
    target = await album_id(sim, "Kinderparty Lieder")
    sim.app.config.remote = {
        "4": RemoteSlotConfig(target_kind="album", target=target, track_index=1)
    }
    response = await client.post("/api/remote/press/4")
    assert response.status_code == 204
    await sim.bus.drain()

    assert sim.player.playlist is not None
    assert sim.player.playlist.album_id == target
    assert len(sim.player.playlist) == 2  # the whole album, not just the one song
    assert sim.player.track_index == 1


async def test_pressing_an_unassigned_key_does_nothing(
    client: httpx2.AsyncClient, sim: Simulation
) -> None:
    assert (await client.post("/api/remote/press/5")).status_code == 204
    await sim.bus.drain()
    assert sim.player.playlist is None


async def test_pressing_a_non_digit_is_rejected(client: httpx2.AsyncClient) -> None:
    assert (await client.post("/api/remote/press/x")).status_code == 422


async def test_saving_a_series_slot_resolves_to_the_latest_episode(
    client: httpx2.AsyncClient,
) -> None:
    response = await client.put(
        "/api/remote/mapping",
        json={"slots": {"7": {"target_kind": "series", "target": "Wissen macht Ah"}}},
    )
    assert response.status_code == 200
    slot = response.json()["slots"][0]
    assert slot["target_kind"] == "series"
    assert slot["target"] == "Wissen macht Ah"
    assert slot["resolved_album_id"] is not None


async def test_saving_clears_digits_left_out(
    client: httpx2.AsyncClient, sim: Simulation
) -> None:
    target = await album_id(sim, "Kinderparty Lieder")
    await client.put(
        "/api/remote/mapping", json={"slots": {"1": {"target_kind": "album", "target": target}}}
    )
    response = await client.put("/api/remote/mapping", json={"slots": {}})
    assert response.json()["slots"] == []


async def test_an_unresolvable_album_target_is_rejected(client: httpx2.AsyncClient) -> None:
    response = await client.put(
        "/api/remote/mapping",
        json={"slots": {"1": {"target_kind": "album", "target": "no-such-album"}}},
    )
    assert response.status_code == 422
    assert "1" in response.json()["detail"]


async def test_an_unresolvable_series_target_is_rejected(client: httpx2.AsyncClient) -> None:
    response = await client.put(
        "/api/remote/mapping",
        json={"slots": {"2": {"target_kind": "series", "target": "no such show"}}},
    )
    assert response.status_code == 422


async def test_a_rejected_save_leaves_the_file_alone(
    client: httpx2.AsyncClient, config_dir: Path
) -> None:
    before = (config_dir / "config.yml").read_text(encoding="utf-8")
    await client.put(
        "/api/remote/mapping",
        json={"slots": {"1": {"target_kind": "album", "target": "no-such-album"}}},
    )
    assert (config_dir / "config.yml").read_text(encoding="utf-8") == before