import { useState, type ReactNode } from "react";
import { useTranslation } from "react-i18next";
import type { PlexFilters } from "../lib/api";
import { formatMoney, formatRuntime } from "../lib/format";
import type { AsideSection, DetailAsideState, DetailFacts } from "../lib/plexDetail";
import { regionName, vocab } from "../lib/vocab";
import { Filterable, PrefToggle } from "./plexDetailUi";
import { Button } from "./ui/Button";
import { Pressable } from "./ui/Pressable";

// The detail pages' second column (the owner's pick "A"): the TMDB facts and key crew of a movie or
// a show beside its description, inside the hero — as the person page sets its known-for rail beside
// the bio — and its keywords under the text. They used to sit under the hero (movie) or
// nowhere at all (show), while the hero's text stopped at ~55% of the panel and left the rest empty. A
// narrow hero stacks the column under the text. Each section is a per-user toggle (default ON), the same
// three prefs on both pages (lib/plexDetail useDetailAside).

type OnFilter = (patch: Partial<PlexFilters>) => void;

// The customize menu's rows: one per section that has something (no toggle for an empty one).
export function DetailAsideToggles({ aside }: { aside: DetailAsideState }) {
  const { t } = useTranslation();
  const label: Record<AsideSection, string> = {
    facts: t("plex.info.prefFacts"),
    keywords: t("plex.info.prefKeywords"),
    crew: t("plex.info.prefCrew"),
  };
  return (["facts", "keywords", "crew"] as const)
    .filter((k) => aside.has[k])
    .map((k) => (
      <PrefToggle key={k} label={label[k]} on={aside.on[k]} onClick={() => aside.toggle(k)} />
    ));
}

// The hero's second column: the facts over the key crew — two lists, read down. Null when neither is
// shown. The keywords are chips that filter, as the genres are, so they sit under the text instead
// (DetailKeywords): all three in this column ran it to twice the text's height at 20 keywords and 12
// crew, a hole under the text — the measured worst case.
export function DetailAside({
  facts,
  shown,
  onFilter,
  onOpenPerson,
}: {
  facts: DetailFacts;
  shown: DetailAsideState["shown"];
  onFilter?: OnFilter;
  onOpenPerson?: (name: string) => void;
}) {
  if (!shown.facts && !shown.crew) return null;
  return (
    <div data-testid="detail-aside" className="flex min-w-0 flex-col gap-5">
      {shown.facts && <FactsSection facts={facts} onFilter={onFilter} />}
      {shown.crew && <CrewSection crew={facts.tmdb?.crew ?? []} onOpenPerson={onOpenPerson} />}
    </div>
  );
}

// The structured facts: release / runtime / cert / budget / revenue / studios / countries, from
// the title's own fields + the persisted TMDB block. What filters the library is an edged chip, a plain
// fact stays flat text (edged = pressable, flat = just says).
function FactsSection({ facts, onFilter }: { facts: DetailFacts; onFilter?: OnFilter }) {
  const { t, i18n } = useTranslation();
  const lang = i18n.language;
  const tmdb = facts.tmdb;
  const studios = tmdb?.studios?.length ? tmdb.studios : facts.studio ? [facts.studio] : [];
  const rows: { key: string; label: string; node: ReactNode }[] = [];
  // The same values filter here as in the hero's meta line (year, certificate, studios).
  const year = facts.year;
  if (year != null)
    rows.push({
      key: "year",
      label: t("plex.info.facts.release"),
      node: (
        <Filterable
          tag
          title={onFilter ? t("plex.info.filterYear", { year }) : undefined}
          onClick={onFilter ? () => onFilter({ yearMin: year, yearMax: year }) : undefined}
        >
          {year}
        </Filterable>
      ),
    });
  if (facts.duration_seconds)
    rows.push({
      key: "runtime",
      label: t("plex.info.facts.runtime"),
      node: formatRuntime(facts.duration_seconds, lang),
    });
  const cert = facts.content_rating;
  if (cert)
    rows.push({
      key: "cert",
      label: t("plex.info.facts.cert"),
      node: (
        <Filterable tag onClick={onFilter ? () => onFilter({ contentRatings: [cert] }) : undefined}>
          {vocab(t, "certificate", cert)}
        </Filterable>
      ),
    });
  if (tmdb?.budget)
    rows.push({
      key: "budget",
      label: t("plex.info.facts.budget"),
      node: formatMoney(tmdb.budget, lang),
    });
  if (tmdb?.revenue)
    rows.push({
      key: "revenue",
      label: t("plex.info.facts.revenue"),
      node: formatMoney(tmdb.revenue, lang),
    });
  if (studios.length)
    rows.push({
      key: "studios",
      label: t("plex.info.facts.studios"),
      node: (
        <span className="flex flex-wrap gap-1.5">
          {studios.map((s) => (
            <Filterable
              key={s}
              tag
              onClick={onFilter ? () => onFilter({ studios: [s] }) : undefined}
            >
              {s}
            </Filterable>
          ))}
        </span>
      ),
    });
  if (tmdb?.production_countries?.length)
    rows.push({
      key: "countries",
      label: t("plex.info.facts.countries"),
      node: tmdb.production_countries
        .map((c) => regionName(t, c.code, i18n.language, c.name))
        .join(", "),
    });
  if (rows.length === 0) return null;
  return (
    <section>
      <h2 className="mb-3 text-sm font-semibold">{t("plex.info.facts.title")}</h2>
      <dl className="grid grid-cols-[auto_1fr] items-baseline gap-x-4 gap-y-2 text-sm">
        {rows.map((r) => (
          <div key={r.key} className="contents">
            <dt className="text-muted">{r.label}</dt>
            <dd className="min-w-0 font-medium">{r.node}</dd>
          </div>
        ))}
      </dl>
    </section>
  );
}

// TMDB keyword chips — tap one to filter the library by that keyword. Under the hero's text.
export function DetailKeywords({
  keywords,
  onFilter,
  className,
}: {
  keywords: string[];
  onFilter?: OnFilter;
  className?: string;
}) {
  const { t } = useTranslation();
  return (
    <section data-testid="detail-keywords" className={className}>
      <h2 className="mb-3 text-sm font-semibold">{t("plex.info.keywords")}</h2>
      <div className="flex flex-wrap gap-1.5">
        {keywords.map((k) => (
          <Filterable
            key={k}
            tag
            onClick={onFilter ? () => onFilter({ keywords: [k] }) : undefined}
          >
            {k}
          </Filterable>
        ))}
      </div>
    </section>
  );
}

// The crew shows its first CREW_SHOWN names and a "Show N more" that opens the rest: the column beside the
// text is the hero's tallest part, and twelve names ran it ~170px past the text (the owner's call).
// A list only a little longer than that shows whole: a toggle that hides one or two names saves no room.
export const CREW_SHOWN = 6;
const CREW_FOLD_OVER = CREW_SHOWN + 2;

// The TMDB key crew — Director / Writer / Producer / …, each opening their person page. It
// complements the hero's Director line (which comes from Plex directly).
function CrewSection({
  crew,
  onOpenPerson,
}: {
  crew: { name: string; job: string }[];
  onOpenPerson?: (name: string) => void;
}) {
  const { t } = useTranslation();
  const [all, setAll] = useState(false);
  const folds = crew.length > CREW_FOLD_OVER;
  const shown = folds && !all ? crew.slice(0, CREW_SHOWN) : crew;
  return (
    <section>
      <h2 className="mb-3 text-sm font-semibold">{t("plex.info.crew")}</h2>
      {/* As many name columns as the column holds: two in the hero's side column, one when narrow. */}
      <div className="grid grid-cols-[repeat(auto-fill,minmax(10rem,1fr))] gap-x-3 gap-y-1.5">
        {shown.map((c, i) => (
          <div key={`${c.name}:${c.job}:${i}`} className="min-w-0">
            {onOpenPerson ? (
              <Pressable
                selectable
                onClick={() => onOpenPerson(c.name)}
                title={t("plex.info.viewPerson", { name: c.name })}
                className="max-w-full truncate text-sm leading-6 font-medium hover:text-accent pointer-coarse:leading-(--touch-target)"
              >
                {c.name}
              </Pressable>
            ) : (
              <div className="truncate text-sm font-medium">{c.name}</div>
            )}
            <div className="truncate text-2xs text-muted">{vocab(t, "crewJob", c.job)}</div>
          </div>
        ))}
      </div>
      {folds && (
        <Button
          variant={all ? "link-muted" : "link"}
          aria-expanded={all}
          onClick={() => setAll((v) => !v)}
          className="mt-2 text-sm"
        >
          {all
            ? t("plex.info.crewLess")
            : t("plex.info.crewMore", { count: crew.length - CREW_SHOWN })}
        </Button>
      )}
    </section>
  );
}