import type { Dispatch, Ship } from "@deadhead/schema";
import { dispatchProgress } from "@deadhead/sim";
import { useState } from "react";
import { Link } from "react-router";
import { useClock } from "../clock/clock";
import { Countdown } from "../components/Countdown";
import { locationName, shipModelName } from "../format";
import { errorMessage, useGameAction, useLoadedPlayer } from "../state/actions";

/** All ships, their pilots and flights; idle ships at a bay can reposition (Step 9.6). */
export function Fleet() {
  const state = useLoadedPlayer();
  const [repositioning, setRepositioning] = useState<Ship | null>(null);

  return (
    <section className="space-y-3 p-4">
      <h1 className="text-xl font-semibold">Fleet</h1>
      {state.ships.length === 0 ? (
        <p className="text-sm text-slate-400">
          No ships yet —{" "}
          <Link to="/market" className="text-amber-400 underline">
            visit the Market
          </Link>
          .
        </p>
      ) : (
        <ul className="space-y-2">
          {state.ships.map((ship) => (
            <ShipRow
              key={ship.id}
              ship={ship}
              dispatch={state.activeDispatches.find((d) => d.id === ship.dispatchId)}
              pilotName={state.pilots.find((p) => p.id === ship.pilotId)?.name ?? null}
              canReposition={
                ship.status === "idle" &&
                ship.pilotId !== null &&
                state.bays.some((b) => b.locationId === ship.locationId) &&
                state.bays.length > 1
              }
              onReposition={() => setRepositioning(ship)}
            />
          ))}
        </ul>
      )}
      {repositioning && (
        <RepositionPicker ship={repositioning} onClose={() => setRepositioning(null)} />
      )}
    </section>
  );
}

function ShipRow(props: {
  ship: Ship;
  dispatch: Dispatch | undefined;
  pilotName: string | null;
  canReposition: boolean;
  onReposition: () => void;
}) {
  const { ship, dispatch, pilotName } = props;
  const now = useClock((s) => s.now);
  const progress = dispatch ? Math.round(dispatchProgress(dispatch, now) * 100) : 0;

  return (
    <li className="rounded-lg border border-slate-800 p-3">
      <div className="flex items-baseline justify-between gap-2">
        <span className="font-medium">{ship.name}</span>
        <span className="text-sm text-slate-400">{shipModelName(ship.modelId)}</span>
      </div>
      <div className="mt-1 text-sm text-slate-300">
        {dispatch
          ? `${locationName(dispatch.originId)} → ${locationName(dispatch.destinationId)}`
          : `At ${locationName(ship.locationId ?? "")}`}
        {" · "}
        <span className="text-slate-400">{pilotName ?? "No pilot"}</span>
      </div>
      {dispatch && (
        <div className="mt-2">
          <div
            role="progressbar"
            aria-label={`${ship.name} progress`}
            aria-valuemin={0}
            aria-valuemax={100}
            aria-valuenow={progress}
            className="h-2 overflow-hidden rounded bg-slate-800"
          >
            <div className="h-full bg-sky-400" style={{ width: `${progress}%` }} />
          </div>
          <div className="mt-1 text-right text-xs text-slate-400">
            Arrives in <Countdown to={dispatch.arrivalAt} />
          </div>
        </div>
      )}
      {props.canReposition && (
        <button
          type="button"
          onClick={props.onReposition}
          className="mt-2 rounded-md border border-slate-700 px-3 py-1 text-sm"
        >
          Reposition
        </button>
      )}
    </li>
  );
}

/** Choose another bay to fly an idle ship to, empty (fuel only). */
function RepositionPicker({ ship, onClose }: { ship: Ship; onClose: () => void }) {
  const state = useLoadedPlayer();
  const reposition = useGameAction("createDispatch");
  const destinations = state.bays.filter((b) => b.locationId !== ship.locationId);

  return (
    <div className="fixed inset-0 z-20 flex items-end justify-center bg-black/60 sm:items-center">
      <div
        role="dialog"
        aria-modal="true"
        aria-labelledby="reposition-title"
        className="w-full max-w-md rounded-t-xl border border-slate-700 bg-slate-900 p-4 sm:rounded-xl"
      >
        <h2 id="reposition-title" className="text-lg font-semibold">
          Reposition {ship.name}
        </h2>
        <p className="text-sm text-slate-400">Fly empty to another bay. You pay fuel only.</p>
        <ul className="mt-3 space-y-2">
          {destinations.map((bay) => (
            <li key={bay.id}>
              <button
                type="button"
                disabled={reposition.isPending}
                onClick={() =>
                  reposition.mutate(
                    {
                      kind: "reposition",
                      shipId: ship.id,
                      pilotId: ship.pilotId!,
                      destinationId: bay.locationId,
                    },
                    { onSuccess: onClose },
                  )
                }
                className="w-full rounded-lg border border-slate-700 p-3 text-left"
              >
                {locationName(bay.locationId)}
              </button>
            </li>
          ))}
        </ul>
        {reposition.isError && (
          <p role="alert" className="mt-3 text-sm text-red-400">
            {errorMessage(reposition.error)}
          </p>
        )}
        <button
          type="button"
          onClick={onClose}
          className="mt-4 w-full rounded-lg border border-slate-700 py-2"
        >
          Cancel
        </button>
      </div>
    </div>
  );
}