import { content, type Location } from "@deadhead/content";
import { realToGame } from "@deadhead/sim";
import { useState, type ReactNode } from "react";
import { Link } from "react-router";
import { useClock } from "../clock/clock";
import { formatGameTime } from "../clock/GameClock";
import { Countdown } from "../components/Countdown";
import { cargoName, formatMillionKm, locationName } from "../format";
import { distanceAt } from "../game";
import { DEFAULT_CAMERA, useCamera } from "../map/camera";
import type { MapSelection } from "../map/hitTest";
import { MapCanvas } from "../map/MapCanvas";
import { modelsReachingFromEarth } from "../map/reach";
import { useLoadedPlayer } from "../state/actions";

const TYPE_LABELS: Record<Location["type"], string> = {
  "atmospheric-world": "Atmospheric world",
  "airless-body": "Airless body",
  "cloud-platform": "Cloud platform",
  "belt-station": "Belt station",
};

/** The solar system map (Phase 10). Tap a location or ship for details. */
export function MapScreen() {
  const state = useLoadedPlayer();
  const [selection, setSelection] = useState<MapSelection | null>(null);

  return (
    <section className="relative h-[calc(100dvh-7.5rem)]">
      <h1 className="sr-only">Map</h1>
      <MapCanvas state={state} onSelect={setSelection} />
      <button
        type="button"
        onClick={() => useCamera.setState(DEFAULT_CAMERA)}
        className="absolute right-3 top-3 rounded-md bg-slate-900/80 px-2 py-1 text-xs text-slate-300"
      >
        Reset view
      </button>
      {selection?.kind === "location" && (
        <LocationPanel locationId={selection.id} onClose={() => setSelection(null)} />
      )}
      {selection?.kind === "flight" && (
        <FlightPanel dispatchId={selection.dispatchId} onClose={() => setSelection(null)} />
      )}
    </section>
  );
}

function Panel({
  title,
  onClose,
  children,
}: {
  title: string;
  onClose: () => void;
  children: ReactNode;
}) {
  return (
    <div
      role="dialog"
      aria-label={title}
      className="absolute inset-x-2 bottom-2 rounded-xl border border-slate-700 bg-slate-900/95 p-3 text-sm"
    >
      <div className="flex items-baseline justify-between gap-2">
        <h2 className="font-semibold">{title}</h2>
        <button type="button" onClick={onClose} aria-label="Close" className="px-2 text-slate-400">
          ✕
        </button>
      </div>
      <div className="mt-1">{children}</div>
    </div>
  );
}

/** A tapped location: details if discovered, and a link to its board if there is a bay. */
function LocationPanel({ locationId, onClose }: { locationId: string; onClose: () => void }) {
  const state = useLoadedPlayer();
  const now = useClock((s) => s.now);
  const location = content.location(locationId)!;
  const discovered = state.locations.some((l) => l.id === locationId && l.discovered);
  const hasBay = state.bays.some((b) => b.locationId === locationId);
  const reachable = discovered ? [] : modelsReachingFromEarth(locationId, now);

  return (
    <Panel title={location.name} onClose={onClose}>
      {discovered ? (
        <>
          <p className="text-slate-300">
            {TYPE_LABELS[location.type]} ·{" "}
            {location.id === "earth"
              ? "Home"
              : `${formatMillionKm(distanceAt("earth", location.id, now))} from Earth`}
          </p>
          <p className="text-slate-400">
            Produces {location.produces.map(cargoName).join(", ") || "nothing"} · demands{" "}
            {location.demands.map(cargoName).join(", ") || "nothing"}
          </p>
          {hasBay ? (
            <Link
              to={`/contracts?bay=${location.id}`}
              className="mt-2 inline-block font-medium text-amber-400 underline"
            >
              View contract board
            </Link>
          ) : (
            <p className="mt-2 text-slate-400">No bay here yet.</p>
          )}
        </>
      ) : (
        <>
          <p className="text-slate-400">Undiscovered — deliver here to unlock.</p>
          <p aria-label="Reachable with" className="mt-1 text-slate-300">
            {reachable.length > 0
              ? `Reachable with: ${reachable.map((m) => m.name).join(", ")}`
              : "No ship can reach it from Earth right now."}
          </p>
        </>
      )}
    </Panel>
  );
}

/** A tapped ship in flight: its route, pilot and ETA. */
function FlightPanel({ dispatchId, onClose }: { dispatchId: string; onClose: () => void }) {
  const state = useLoadedPlayer();
  const dispatch = state.activeDispatches.find((d) => d.id === dispatchId);
  if (!dispatch) return null;
  const shipName = dispatch.tutorial
    ? "Company loaner"
    : (state.ships.find((s) => s.id === dispatch.shipId)?.name ?? "Ship");
  const pilotName = state.pilots.find((p) => p.id === dispatch.pilotId)?.name ?? "Unknown pilot";

  return (
    <Panel title={shipName} onClose={onClose}>
      <p className="text-slate-300">
        {locationName(dispatch.originId)} → {locationName(dispatch.destinationId)}
      </p>
      <p className="text-slate-400">Pilot: {pilotName}</p>
      <p className="text-slate-400">
        Arrives in <Countdown to={dispatch.arrivalAt} /> (
        {formatGameTime(realToGame(dispatch.arrivalAt, content.config))})
      </p>
    </Panel>
  );
}