"""The station pane: paging, the position readout and the scrollbar."""

from __future__ import annotations

import re

import pytest

from beefy_player.app import BeefyPlayerApp
from beefy_player.widgets.station_list import StationList


def app_for(provider: str, *, offline: bool = True) -> BeefyPlayerApp:
    return BeefyPlayerApp(provider=provider, autoplay=False, offline=offline, audio=False)


def test_thumb_geometry() -> None:
    # nothing to scroll: the whole track is the thumb
    assert StationList.thumb(10, 10, 0) == set(range(10))
    # top of a long list
    top = StationList.thumb(10, 100, 0)
    assert 0 in top and len(top) >= 1
    # bottom of the same list ends at the last row
    bottom = StationList.thumb(10, 100, 90)
    assert 9 in bottom
    # mid-list sits between the two
    middle = StationList.thumb(10, 100, 45)
    assert min(middle) > min(top) and max(middle) < max(bottom)


@pytest.mark.asyncio
async def test_paging_moves_a_screen_and_back() -> None:
    app = app_for("somafm")
    async with app.run_test(size=(100, 26)) as pilot:
        await pilot.pause()
        pane = app.query_one(StationList)
        page = pane.size.height - 1
        start = app.index

        await pilot.press("pagedown")
        await pilot.pause()
        assert app.index == min(start + page, len(app.view) - 1)

        await pilot.press("pageup")
        await pilot.pause()
        assert app.index == start

        # the bottom of the list clamps instead of wrapping
        await pilot.press("shift+g", "pagedown")
        await pilot.pause()
        assert app.index == len(app.view) - 1


@pytest.mark.asyncio
async def test_the_title_reads_out_the_position() -> None:
    app = app_for("somafm")
    async with app.run_test(size=(100, 26)) as pilot:
        await pilot.pause()
        pane = app.query_one(StationList)
        assert re.fullmatch(r"STATIONS · \d+/\d+", pane.border_title)
        await pilot.press("down")
        await pilot.pause()
        first, total = pane.border_title.split(" · ")[1].split("/")
        assert int(total) == len(app.view)
        assert int(first) == app.index + 1


@pytest.mark.asyncio
async def test_the_scrollbar_appears_only_when_the_list_overflows() -> None:
    app = app_for("somafm")
    async with app.run_test(size=(100, 26)) as pilot:
        await pilot.pause()
        pane = app.query_one(StationList)
        rows = [line.plain for line in pane.render().renderables]
        assert rows[0].startswith("╭") and rows[-1].startswith("╰")
        content = rows[1:-1]
        # thumb only, in the frame grey: blank cells elsewhere, no rail
        assert all(row[-2] in "▐ " for row in content)
        assert any(row[-2] == "▐" for row in content)

    app = app_for("rinse")  # three stations, no scrolling
    async with app.run_test(size=(100, 26)) as pilot:
        await pilot.pause()
        pane = app.query_one(StationList)
        rows = [line.plain for line in pane.render().renderables]
        assert rows[0].startswith("╭") and rows[-1].startswith("╰")
        assert sum("Rinse" in row or "Kool" in row or "SWU" in row for row in rows) == 3
        # three stations fit: no thumb in the content rows
        assert not any(row[-2] == "▐" for row in rows[1:-1])


@pytest.mark.asyncio
async def test_the_filter_keeps_the_readout_in_step() -> None:
    app = app_for("somafm")
    async with app.run_test(size=(100, 26)) as pilot:
        await pilot.pause()
        await pilot.press("slash")
        await pilot.pause()
        app.query_one("SearchInput").value = "drone"
        await pilot.pause()
        pane = app.query_one(StationList)
        assert pane.border_title.startswith("STATIONS · /drone · ")
        filtered = len(app.view)
        assert pane.border_title.endswith(f"/{filtered}")