"""Station list with favourites, live markers and a filter."""

from __future__ import annotations

from typing import TYPE_CHECKING, cast

from rich.cells import cell_len
from rich.console import Group, RenderableType
from rich.text import Text
from textual.widget import Widget

from .common import compact_count, truncate

if TYPE_CHECKING:
    from ..app import BeefyPlayerApp


class StationList(Widget):
    can_focus = False

    def __init__(self) -> None:
        super().__init__()
        self.border_title = "STATIONS"

    def set_filter(self, query: str) -> None:
        safe_query = query.replace("[", "(").replace("]", ")") if query else ""
        title = f"STATIONS · /{safe_query}" if safe_query else "STATIONS"
        if self.border_title != title:
            self.border_title = title

    def on_mouse_scroll_down(self, event) -> None:
        cast("BeefyPlayerApp", self.app).action_cursor_down()

    def on_mouse_scroll_up(self, event) -> None:
        cast("BeefyPlayerApp", self.app).action_cursor_up()

    def render(self) -> RenderableType:
        app = cast("BeefyPlayerApp", self.app)
        width = max(12, self.size.width)
        height = max(1, self.size.height)
        view = app.view

        if not view:
            message = "no stations match" if app.query else "loading stations…"
            return Group(Text(truncate(message, width), style="dim italic"))

        first = 0
        if len(view) > height:
            first = max(0, min(app.index - height // 2, len(view) - height))

        lines: list[Text] = []
        for offset in range(min(height, len(view))):
            index = first + offset
            station = view[index]
            selected = index == app.index
            current = app.current is not None and app.current.id == station.id
            playing = current and app.playing_state not in ("stopped", "error")

            marker = "▌" if selected else " "
            star = "★" if station.favorite else " "
            play = (
                ("‖" if app.playing_state == "paused" else "▶") if current else " "
            )

            count_text = ""
            count_width = 0
            if width >= 26 and station.listeners > 0:
                count_text = f"{compact_count(station.listeners)} ♪"
                count_width = cell_len(count_text) + 1

            prefix = marker + star + play + " "
            available = width - cell_len(prefix) - count_width
            title = truncate(station.title, max(4, available))
            gap = max(0, width - cell_len(prefix) - cell_len(title) - count_width)

            if selected:
                base = ""
                marker_style = "magenta"
                title_style = "bold underline"
                count_style = "bold"
            elif current:
                base = ""
                marker_style = "cyan"
                title_style = "cyan"
                count_style = "dim"
            else:
                base = ""
                marker_style = ""
                title_style = ""
                count_style = "dim"

            row = Text(no_wrap=True, style=base)
            row.append(marker, style=marker_style)
            row.append(star, style="bold yellow" if station.favorite else "")
            row.append(play, style="cyan" if playing else "")
            row.append(" ")
            row.append(title, style=title_style)
            row.append(" " * gap)
            if count_text:
                row.append(count_text, style=count_style)
            used = cell_len(prefix) + cell_len(title) + gap + cell_len(count_text)
            if used < width:
                row.append(" " * (width - used))
            lines.append(row)

        return Group(*lines)