from __future__ import annotations

import re
import types

import pytest
from rich.cells import cell_len

from somafm_tui.widgets.header import HeaderBar

TIME = re.compile(r"\d\d:\d\d:\d\d$")
DATE = re.compile(r"[A-Z][a-z]{2} \d\d [A-Z][a-z]{2}$")
VOLUME = re.compile(r"vol \d+%$")


def render_header(width: int, height: int = 3) -> list[str]:
    """Render the header without a running app, as plain text per line."""
    fake = type("Fake", (), {})()
    fake.app = types.SimpleNamespace(
        playing_state="playing", volume=70, current=None, notice=None
    )
    fake.size = types.SimpleNamespace(width=width, height=height)
    return [line.plain.rstrip() for line in HeaderBar.render(fake).renderables]


@pytest.mark.parametrize("width", [54, 60, 100, 143, 200])
def test_right_block_is_flush_right(width: int) -> None:
    """Clock, date and volume all end on the same column, at the edge."""
    clock, date, volume = render_header(width)
    assert [cell_len(line) for line in (clock, date, volume)] == [width] * 3
    assert TIME.search(clock)
    assert DATE.search(date)
    assert VOLUME.search(volume)


def test_ragged_middle_does_not_shift_the_right_block() -> None:
    """"SOMA FM RADIO" and "SAN FRANCISCO" are shorter than
    "LISTENER SUPPORTED"; the right block must not follow their length."""
    clock, date, volume = render_header(143)
    assert cell_len(clock) == cell_len(date) == cell_len(volume) == 143


def test_right_block_hidden_on_narrow_terminals() -> None:
    """Below the threshold the right block is dropped, not squashed."""
    lines = render_header(30)
    assert all(":" not in line for line in lines)