import { content } from "@deadhead/content";
import type { TutorialState } from "@deadhead/schema";
import { realToGame } from "@deadhead/sim";
import { useClock } from "../clock/clock";
import { formatGameTime } from "../clock/GameClock";
import { Countdown } from "../components/Countdown";
import { GoalsCard } from "../components/GoalsCard";
import { LoanCard } from "../components/LoanCard";
import { formatCredits, locationName } from "../format";
import { useLoadedPlayer } from "../state/actions";

/** What the player needs to do next to reach the deal (decision 0.5.30). */
export function tutorialHint(tutorial: TutorialState, runsBeforeDeal: number): string {
  if (tutorial.dealAvailable) return "Halvorsen is waiting at Earth with an offer.";
  if (tutorial.runsCompleted < runsBeforeDeal) {
    return "Keep flying — the old man has an offer for you.";
  }
  // Enough runs, but the deal is made at Earth.
  return tutorial.runInFlight
    ? "Halvorsen will talk once you land at Earth."
    : "One more run: bring the ship back to Earth — Halvorsen is waiting there.";
}

export function HQ() {
  const state = useLoadedPlayer();
  const now = useClock((s) => s.now);
  const idle = state.ships.filter((s) => s.status === "idle").length;
  const flying = state.ships.filter((s) => s.status === "in-flight").length;
  const runsBeforeDeal = content.config.tutorialRunsBeforeDeal;
  const next = [...state.activeDispatches].sort((a, b) => a.arrivalAt - b.arrivalAt)[0];
  // Resting pilots and who wakes first (CR-004).
  const resting = state.pilots
    .filter((p) => p.resting && p.restEndsAt !== null)
    .sort((a, b) => a.restEndsAt! - b.restEndsAt!);

  return (
    <section className="space-y-4 p-4">
      <h1 className="text-xl font-semibold">HQ</h1>

      <div className="grid grid-cols-2 gap-3">
        <Stat label="Credits" value={formatCredits(state.company.credits)} />
        <Stat label="Game date" value={formatGameTime(realToGame(now, content.config))} />
        <Stat label="Ships idle" value={String(idle)} />
        <Stat label="Ships in flight" value={String(flying)} />
      </div>

      <div className="rounded-lg border border-slate-800 p-3">
        <h2 className="text-sm font-semibold text-slate-300">Next arrival</h2>
        {next ? (
          <p className="mt-1">
            {locationName(next.originId)} → {locationName(next.destinationId)} in{" "}
            <Countdown to={next.arrivalAt} />
          </p>
        ) : (
          <p className="mt-1 text-sm text-slate-400">Nothing in flight.</p>
        )}
      </div>

      {!state.tutorial && (
        <div aria-label="Pilot rest" className="rounded-lg border border-slate-800 p-3">
          <h2 className="text-sm font-semibold text-slate-300">Pilots resting: {resting.length}</h2>
          {resting[0] ? (
            <p className="mt-1">
              {resting[0].name} wakes in <Countdown to={resting[0].restEndsAt!} done="now" />
            </p>
          ) : (
            <p className="mt-1 text-sm text-slate-400">Everyone is ready to fly.</p>
          )}
        </div>
      )}

      {!state.tutorial && state.ships.length === 0 && (
        <p className="text-sm text-slate-400">No ships yet — buy one in the Market.</p>
      )}

      {state.tutorial && (
        <div className="rounded-lg border border-amber-500/40 bg-amber-500/10 p-3">
          <h2 className="font-semibold text-amber-300">Flying for Halvorsen Lunar Freight</h2>
          <p aria-label="Company runs" className="mt-1 text-sm text-slate-300">
            Company runs: {Math.min(state.tutorial.runsCompleted, runsBeforeDeal)} of{" "}
            {runsBeforeDeal}
          </p>
          <p aria-label="Next step" className="mt-1 text-xs text-slate-400">
            {tutorialHint(state.tutorial, runsBeforeDeal)}
          </p>
        </div>
      )}

      {!state.tutorial && <GoalsCard />}

      {!state.tutorial && state.company.loanBalance > 0 && <LoanCard />}
    </section>
  );
}

function Stat({ label, value }: { label: string; value: string }) {
  return (
    <div className="rounded-lg border border-slate-800 p-3">
      <div className="text-xs text-slate-400">{label}</div>
      <div className="mt-1 font-semibold tabular-nums">{value}</div>
    </div>
  );
}