import type { CSSProperties, ReactNode, Ref } from "react";
import { useTranslation } from "react-i18next";
import { ListEnd, ListStart, Repeat, Repeat1, Shuffle, SkipBack, SkipForward } from "lucide-react";
import type { VideoDetail } from "../../lib/api";
import type { AutoMode, LoopMode } from "../../lib/playerModes";
import { IconButton } from "../../components/ui/IconButton";
import Tooltip from "../../components/ui/Tooltip";
import { StateMessage } from "../../components/ui/QueryState";
import { unavailable } from "../../components/ui/unavailable";
import { ClampedText } from "../../components/ui/ClampedText";
import { renderDescription } from "./descriptionLinks";

// Presentational controls for the YouTube modal player (PlayerModal), split out of the god component —
// the sibling of plexPlayerControls.tsx. No state or effects here; all behaviour comes in via props.
// The auto-advance / loop modes it renders are defined in `lib/playerModes`.

/** Why a control is off, where a key's focus reads it too: a browser's own tooltip (`title`, left on
 *  the button for what it does) shows for a mouse alone. `stable`: the reason comes and goes under a
 *  control that may hold the focus. */
export function ReasonTooltip({
  reason,
  side,
  children,
}: {
  reason: string | undefined;
  side?: "left";
  children: ReactNode;
}) {
  return (
    <Tooltip hint={reason ?? ""} always={!!reason} side={side} stable>
      {children}
    </Tooltip>
  );
}

/** The queue transport cluster — prev / counter / next, then the auto-advance and loop modes.
 *  Rendered in two places from ONE list of controls: the modal's queue bar (`variant:"modal"`, normal
 *  glass theme) and the big-view docked control bar (`variant:"docked"`, white-on-dark). Glyphs only
 *  in both: the docked bar once spoke the names from a width up, and on an iPad its row outgrew the
 *  screen. What a control does, its glyph and its tooltip are said once; only the look differs.
 *  Every control's tooltip carries its full name (and the shortcut, where it has one), so a glyph
 *  still says what it does and which mode it is in. The modes are cycles,
 *  not switches: `lit` when not off, and the name says which. Auto-advance wears list glyphs of its
 *  own — the skip arrows are Previous / Next, beside it (DESIGN.md "A glyph means one thing"). The
 *  wrapper (fragment vs. bordered row) stays at the call site. */
export function PlayerTransportControls({
  variant,
  index,
  queueLength,
  canPrev,
  canNext,
  prevReason,
  nextReason,
  autoMode,
  loopMode,
  onPrev,
  onNext,
  onCycleAuto,
  onCycleLoop,
}: {
  variant: "docked" | "modal";
  index: number;
  queueLength: number;
  /** Whether there is a playable item that way (one YouTube refused is passed over). */
  canPrev: boolean;
  canNext: boolean;
  /** Why Previous / Next are off when items are left that way (only ones YouTube refused): the
   *  button stays focusable and its tooltip says so. Unset at the queue's ends, which explain
   *  themselves. */
  prevReason?: string;
  nextReason?: string;
  autoMode: AutoMode;
  loopMode: LoopMode;
  onPrev: () => void;
  onNext: () => void;
  onCycleAuto: () => void;
  onCycleLoop: () => void;
}) {
  const { t } = useTranslation();
  const docked = variant === "docked";
  // Never broken or squeezed: in a row that scrolls, a squeezed "1 / 55" stood on three lines.
  const counter = `shrink-0 whitespace-nowrap tabular-nums ${docked ? "text-white/70" : "text-muted"}`;
  const divider = `h-4 w-px shrink-0 ${docked ? "bg-white/20" : "bg-border"}`;
  const autoName = `${t("player.autoAdvance.label")}: ${t(`player.autoAdvance.${autoMode}`)}`;
  const loopName = `${t("player.loop.label")}: ${t(`player.loop.${loopMode}`)}`;
  type Control = {
    key: string;
    glyph: ReactNode;
    name: string;
    title: string;
    onClick: () => void;
    disabled?: boolean;
    reason?: string;
    lit?: boolean;
  };
  const step: Control[] = [
    {
      key: "prev",
      glyph: <SkipBack />,
      name: t("player.previous"),
      title: `${t("player.previous")} · Shift+←`,
      onClick: onPrev,
      disabled: !canPrev,
      reason: canPrev ? undefined : prevReason,
    },
    {
      key: "next",
      glyph: <SkipForward />,
      name: t("player.next"),
      title: `${t("player.next")} · Shift+→`,
      onClick: onNext,
      disabled: !canNext,
      reason: canNext ? undefined : nextReason,
    },
  ];
  // Persistent playback settings — cycle on click, saved to your account.
  const modes: Control[] = [
    {
      key: "auto",
      glyph:
        autoMode === "prev" ? <ListStart /> : autoMode === "random" ? <Shuffle /> : <ListEnd />,
      name: autoName,
      title: `${autoName} · ${t("player.autoAdvance.hint")}`,
      onClick: onCycleAuto,
      lit: autoMode !== "off",
    },
    {
      key: "loop",
      glyph: loopMode === "one" ? <Repeat1 /> : <Repeat />,
      name: loopName,
      title: `${loopName} · ${t("player.loop.hint")}`,
      onClick: onCycleLoop,
      lit: loopMode !== "off",
    },
  ];
  const render = (c: Control) => (
    <ReasonTooltip key={c.key} reason={c.reason}>
      <IconButton
        variant={docked ? "overlay" : undefined}
        onClick={c.onClick}
        {...unavailable(c.disabled, c.reason)}
        lit={c.lit}
        label={c.name}
        title={c.title}
      >
        {c.glyph}
      </IconButton>
    </ReasonTooltip>
  );
  return (
    <>
      {render(step[0]!)}
      <span className={counter}>
        {index + 1} / {queueLength}
      </span>
      {render(step[1]!)}
      <span className={divider} />
      {modes.map(render)}
    </>
  );
}

/** The description, said the same way in its two places (the popover under 1280 px, the panel beside
 *  the video above it): loading, failed with a retry, the text in the caller's box, or none. One
 *  ladder, so the two cannot drift (the failed state was once tested in the panel only).
 *  `ref` / `style` / `className` dress the text's box only. `clamp` cuts it to three lines with a
 *  More / Less (the panel, where the description sits under the actions and is rarely read whole). */
export function PlayerDescription({
  detail,
  currentId,
  onSeek,
  onLoadVideo,
  className,
  style,
  ref,
  clamp = false,
}: {
  detail: { isLoading: boolean; isError: boolean; data?: VideoDetail; refetch: () => unknown };
  currentId: string;
  onSeek: (seconds: number) => void;
  onLoadVideo: (id: string, start: number | null) => void;
  className: string;
  style?: CSSProperties;
  ref?: Ref<HTMLDivElement>;
  clamp?: boolean;
}) {
  const { t } = useTranslation();
  if (detail.isLoading) return <div className="text-sm text-muted">{t("player.loading")}</div>;
  if (detail.isError && !detail.data)
    return (
      <StateMessage tone="error" compact onRetry={() => void detail.refetch()}>
        {t("player.descriptionFailed")}
      </StateMessage>
    );
  const text = detail.data?.description;
  if (!text) return <div className="text-sm text-muted">{t("player.noDescription")}</div>;
  if (clamp)
    return (
      <ClampedText
        text={text}
        lines={3}
        moreLabel={t("player.descriptionMore")}
        lessLabel={t("player.descriptionLess")}
        textClassName={className}
      >
        {renderDescription(text, { currentId, onSeek, onLoadVideo, t })}
      </ClampedText>
    );
  return (
    <div ref={ref} style={style} className={className}>
      {renderDescription(text, { currentId, onSeek, onLoadVideo, t })}
    </div>
  );
}