from __future__ import annotations

import html
import json
import re

import pytest

from beefy_player import config
from beefy_player.models import Song, Station
from beefy_player.providers import PROVIDERS, available_providers, get_provider
from beefy_player.providers.base import RadioProvider
from beefy_player.providers.somafm import SomaFMProvider
from beefy_player.providers.tilderadio import TilderadioProvider
from beefy_player.widgets.header import HeaderBar


def rendered_text(app) -> str:
    svg = html.unescape(app.export_screenshot()).replace("\xa0", " ")
    return re.sub(r"<[^>]+>", " ", svg)


def test_registry_lists_somafm_as_the_default() -> None:
    assert available_providers() == ("somafm", "tilderadio")
    assert isinstance(get_provider(), SomaFMProvider)
    assert get_provider("somafm") is get_provider()
    assert isinstance(get_provider("tilderadio"), TilderadioProvider)
    # a stale slug in the config file must not stop the app from starting
    assert get_provider("no-such-catalogue") is get_provider()


def test_somafm_provider_describes_its_catalogue() -> None:
    provider = get_provider()
    assert provider.name == "SomaFM"
    assert provider.brand == "SOMA FM"
    assert provider.station_source == "somafm.com/channels.json"
    assert "somafm.com" in provider.user_agent

    stations = provider.fallback_stations()
    assert len(stations) > 40
    station = stations[0]
    assert station.provider == "somafm"
    assert station.uid == f"somafm:{station.id}"
    assert all("somafm.com" in url for url in provider.fallback_urls(station))


class FakeProvider(RadioProvider):
    """A second catalogue, as small as the interface allows."""

    id = "fake"
    name = "Fake FM"
    homepage = "fake.test"
    brand = "FAKE FM"
    tagline = "not real radio"
    station_source = "fake.test/stations.json"
    history_source = "recent.json"

    def __init__(self) -> None:
        self.station = Station(
            id="one", title="Fake One", genre="test", provider=self.id
        )

    async def fetch_stations(self, client):
        return [self.station]

    def load_cached_stations(self):
        return [self.station]

    def fallback_stations(self):
        return [self.station]

    async def fetch_history(self, client, station_id):
        return [Song(title="Tune", artist="Someone")]

    def load_cached_history(self, station_id):
        return []


@pytest.mark.asyncio
async def test_app_runs_against_a_different_catalogue(monkeypatch) -> None:
    """The UI must not know which catalogue it is showing."""
    from beefy_player.app import BeefyPlayerApp

    fake = FakeProvider()
    monkeypatch.setitem(PROVIDERS, "fake", fake)
    app = BeefyPlayerApp(provider="fake", autoplay=False, offline=True, audio=False)
    assert app.provider is fake
    async with app.run_test(size=(100, 30)) as pilot:
        await pilot.pause()
        assert app.current is not None
        assert app.current.uid == "fake:one"
        app.query_one("StagePanel").refresh_stage()
        await pilot.pause()
        text = rendered_text(app)
        assert "FAKE ONE" in text
        assert "Fake FM" in app.title


def test_config_remembers_the_provider() -> None:
    assert config.Config.load().provider == "somafm"
    config.Config(provider="fake").save()
    assert config.Config.load().provider == "fake"


def test_legacy_config_is_migrated_once(monkeypatch) -> None:
    legacy = config.LEGACY_CONFIG_PATH
    legacy.parent.mkdir(parents=True, exist_ok=True)
    legacy.write_text(
        json.dumps({"favorites": ["defcon"], "volume": 33, "last_station": "dronezone"})
    )

    loaded = config.Config.load()
    assert loaded.favorites == ["defcon"]
    assert loaded.volume == 33
    assert loaded.last_station == "dronezone"
    assert config.CONFIG_PATH.exists()

    # the new file wins from then on
    config.Config(volume=11).save()
    legacy.write_text(json.dumps({"volume": 99}))
    assert config.Config.load().volume == 11


def test_environment_variables_prefer_the_beefy_prefix(monkeypatch) -> None:
    monkeypatch.setenv("BEEFY_IMAGES", "tgp")
    monkeypatch.setenv("SOMAFM_IMAGES", "0")
    assert config.env_var("IMAGES") == "tgp"

    monkeypatch.delenv("BEEFY_IMAGES")
    assert config.env_var("IMAGES") == "0"  # the old spelling still works

    monkeypatch.delenv("SOMAFM_IMAGES")
    assert config.env_var("IMAGES") == ""


def test_tilderadio_replaces_the_station_list_with_a_schedule() -> None:
    provider = TilderadioProvider()
    assert provider.has_schedule is True
    # the SomaFM wordmark's slot now holds tilderadio's own art and motto
    assert provider.hero and not provider.hero_gradient
    assert provider.hero_lines == (
        "TILDERADIO",
        "STREAMED BY / FOR USERS OF THE",
        "TILDEVERSE",
    )
    assert SomaFMProvider().has_schedule is False


class _CatalogueApp:
    """A headless app on a fixed catalogue, for the picker tests."""

    def __init__(self, provider: str = "somafm") -> None:
        from beefy_player.app import BeefyPlayerApp

        self.app = BeefyPlayerApp(
            provider=provider, autoplay=False, offline=True, audio=False
        )


@pytest.mark.asyncio
async def test_p_opens_the_picker_and_switches_catalogue() -> None:
    from beefy_player.widgets.providers import ProviderScreen
    from beefy_player.widgets.schedule import SchedulePanel
    from beefy_player.widgets.station_list import StationList

    app = _CatalogueApp().app
    async with app.run_test(size=(110, 40)) as pilot:
        await pilot.pause()
        assert app.provider.id == "somafm"
        assert app.query_one(StationList).display is True
        assert app.query_one(SchedulePanel).display is False
        assert app.query_one(HeaderBar).styles.height.value == 4

        await pilot.press("p")
        await pilot.pause()
        assert isinstance(app.screen, ProviderScreen)

        await pilot.press("2")  # jump straight to tilderadio
        await pilot.pause()
        await pilot.pause()

        assert app.provider.id == "tilderadio"
        assert app.config.provider == "tilderadio"
        assert [station.id for station in app.stations] == ["tilderadio"]
        # the left pane becomes the schedule, and the hero grows
        assert app.query_one(StationList).display is False
        assert app.query_one(SchedulePanel).display is True
        assert app.query_one(HeaderBar).styles.height.value == 8
        assert "tilderadio" in app.title


@pytest.mark.asyncio
async def test_escape_closes_the_picker_without_switching() -> None:
    app = _CatalogueApp().app
    async with app.run_test(size=(110, 40)) as pilot:
        await pilot.pause()
        await pilot.press("p")
        await pilot.pause()
        await pilot.press("escape")
        await pilot.pause()
        assert app.provider.id == "somafm"
        assert app.config.provider != "tilderadio"


@pytest.mark.asyncio
async def test_help_names_both_catalogues_and_the_switch_key() -> None:
    app = _CatalogueApp().app
    async with app.run_test(size=(120, 60)) as pilot:
        await pilot.pause()
        await pilot.press("question_mark")
        await pilot.pause()
        text = rendered_text(app)
        assert "CATALOGUES" in text
        assert "somafm" in text and "tilderadio" in text
        assert "switch station catalogue" in text


def test_config_remembers_a_station_per_catalogue() -> None:
    config.Config(last_stations={"somafm": "defcon", "tilderadio": "tilderadio"}).save()
    loaded = config.Config.load()
    assert loaded.last_station_for("somafm") == "defcon"
    assert loaded.last_station_for("tilderadio") == "tilderadio"
    # a catalogue nobody has tuned yet falls back to the legacy single field
    assert loaded.last_station_for("no-such-catalogue") == loaded.last_station


@pytest.mark.asyncio
async def test_short_terminals_crop_the_hero_but_keep_the_ticker() -> None:
    app = _CatalogueApp("tilderadio").app
    async with app.run_test(size=(90, 24)) as pilot:
        await pilot.pause()
        header = app.query_one(HeaderBar)
        assert header.styles.height.value <= 6
        lines = [line.plain for line in header.render().renderables]
        assert any("STOPPED" in line or "PLAYING" in line for line in lines)