siftlode/frontend/src/lib/plexPlayerPrefs.ts

import { formatDuration } from "./format";

// Audio/subtitle selections are persisted per-account by LANGUAGE, not by ordinal — the same track
// ordinal means different languages in different files, so we re-resolve the saved language to this
// item's track layout on load (and it carries across episodes/movies, like Plex's preferred-language).
export type AudioStream = { ord: number; language?: string | null; default: boolean };
export type SubStream = { ord: number; language?: string | null; text: boolean };
export function audioOrdForLang(streams: AudioStream[], lang: string): number | null {
  if (!lang) return null; // "" = use the file's default first track (keeps direct-play, no forced HLS)
  const i = streams.findIndex((s) => (s.language ?? "") === lang);
  // absent (-1) or already the FIRST track (0, which the backend plays by default) → no override.
  // (Match by index, NOT the `default` flag — some files mark a non-first track default, which made
  // the restored language silently fall back to track 0.)
  return i <= 0 ? null : streams[i]!.ord; // i > 0 here, so streams[i] exists
}
export function subOrdForLang(subs: SubStream[], lang: string): number | null {
  if (!lang) return null; // "" = subtitles off
  const m = subs.find((s) => s.text && (s.language ?? "") === lang);
  return m ? m.ord : null; // preferred language not available here → off
}

// Per-account player preferences, persisted so they survive F5 and carry across items.
export type PlexPlayerPrefs = {
  volume: number; // 0..1
  muted: boolean;
  audioLang: string; // "" = default first audio
  subLang: string; // "" = subtitles off
  subOffset: number; // seconds, +later / -earlier (client-side cue shift)
  audioOffset: number; // seconds, +later / -earlier (server-side -itsoffset)
  barAutoHide: boolean; // auto-hide the control bar during playback
  seekStep: number; // plain ←/→ jump (s)
  fineSeekStep: number; // Ctrl+←/→ jump (s)
  subSize: number; // subtitle font size (%)
  subColor: string; // subtitle text color (hex)
  subBg: string; // subtitle background ("transparent" or hex)
  subPos: number; // subtitle vertical position (cue line %, higher = lower on screen)
  subShadow: number; // subtitle text-shadow blur px (0 = off)
  subShadowColor: string; // subtitle text-shadow color (hex)
  clockShow: boolean; // top-right wall clock
  clock24h: boolean; // 24h (European) vs 12h am/pm
  clockSize: number; // clock font size (%)
  clockColor: string; // clock color (hex)
  clockDate: boolean; // show the date alongside the time
  clockDateStyle: "en" | "hu"; // DD-MON-YYYY Ddd  vs  YYYY-MON-DD Ddd
  autoSkipIntro: boolean; // auto-skip the intro marker after a countdown
  autoSkipCredits: boolean; // auto-skip credits → jump to the next item (binge)
  autoSkipDelay: number; // countdown before an auto-skip fires (s, 0 = immediate)
};
export const DEFAULT_PREFS: PlexPlayerPrefs = {
  volume: 1,
  muted: false,
  audioLang: "",
  subLang: "",
  subOffset: 0,
  audioOffset: 0,
  barAutoHide: true,
  seekStep: 10,
  fineSeekStep: 1,
  subSize: 100,
  subColor: "#ffffff",
  subBg: "transparent",
  subPos: 88,
  subShadow: 0,
  subShadowColor: "#000000",
  clockShow: true,
  clock24h: true,
  clockSize: 100,
  clockColor: "#ffffff",
  clockDate: false,
  clockDateStyle: "hu",
  autoSkipIntro: false,
  autoSkipCredits: false,
  autoSkipDelay: 5,
};
export const clamp01 = (n: number) => Math.max(0, Math.min(1, n));

// A punchy subtitle shadow. The old single 0-offset blur washed out to nothing on bright scenes even
// at the max slider value; instead lay down eight offset copies (a solid dark OUTLINE around the
// glyphs) plus a soft glow, all scaled by the slider — legible over anything, e.g. yellow text on a
// snow-white frame. Empty string when the slider is 0 (shadow off).
export function subShadowCss(px: number, color: string): string {
  if (px <= 0) return "";
  const o = px;
  const b = Math.max(1, Math.round(px / 2));
  const dirs: [number, number][] = [
    [o, 0],
    [-o, 0],
    [0, o],
    [0, -o],
    [o, o],
    [o, -o],
    [-o, o],
    [-o, -o],
  ];
  const outline = dirs.map(([x, y]) => `${x}px ${y}px ${b}px ${color}`).join(",");
  return `text-shadow:${outline},0 0 ${o * 2}px ${color};`;
}

// Top-right wall clock text: time (24h European or 12h am/pm) + optional date in one of two fixed
// styles — EN "08-JUL-2026 Wed" or HU "2026-JÚL-08 Sze" (uppercase short month, short weekday).
export function clockParts(now: Date, p: PlexPlayerPrefs): { time: string; date: string | null } {
  const time = now.toLocaleTimeString(p.clock24h ? "en-GB" : "en-US", {
    hour: "2-digit",
    minute: "2-digit",
    hour12: !p.clock24h,
  });
  if (!p.clockDate) return { time, date: null };
  const loc = p.clockDateStyle === "hu" ? "hu-HU" : "en-GB";
  const dd = String(now.getDate()).padStart(2, "0");
  const yyyy = now.getFullYear();
  const mon = now.toLocaleString(loc, { month: "short" }).replace(/\./g, "").toUpperCase();
  const dow = now.toLocaleString(loc, { weekday: "short" }).replace(/\./g, "");
  const date =
    p.clockDateStyle === "hu" ? `${yyyy}-${mon}-${dd} ${dow}` : `${dd}-${mon}-${yyyy} ${dow}`;
  return { time, date };
}

// hls.js plays our non-zero-start `-copyts` HLS stream ~1.0s BEHIND the media clock (measured by
// frame-capture: the first frame at source K lands at currentTime≈1.0, not 0 — constant, framerate- and
// segment-type-independent). Native-time subtitles (shifted by K) would therefore run 1s early, so we
// bake this compensation into the shift. Only on the HLS path; direct-play uses the file's real clock.
export const HLS_SUB_LAG = 1.0;

// Seekbar clock — same H:MM:SS / M:SS shape as the shared formatDuration, but the live media clock
// can be NaN/negative before metadata loads, so clamp to 0 first (formatDuration never sees null here).
export function fmt(t: number): string {
  return formatDuration(isFinite(t) && t >= 0 ? t : 0);
}