benjivers/val Public Public: anyone can read this; the crew can change it.

/**

 * One line of advice, in the player's own words.

 *

 * A pure function of the snapshot the server sent plus two things the client

 * works out from the map it was given: whether you are standing on a site,

 * and whether you are within reach of the spike. Never more than one prompt —

 * the most urgent thing wins, because two instructions at once is none.

 */

/** Within this many units the server lets you pick up, plant or defuse. */

export const REACH = 46;

const secs = (n) => Math.max(0, Math.ceil(n));

export function choosePrompt(snap, world = {}) {

  if (!snap) return "";

  const me = snap.me;

  const spike = snap.spike;

  const onSite = world.onSite === true;

  const nearSpike = world.nearSpike === true;

  // The page is played with a mouse and the terminal with keys; one line

  // names the input, so it says the thing the reader can actually do.

  const buyWith = world.input === "keys" ? "Press b and buy a gun you can afford." : "Click a gun you can afford.";

  if (snap.phase === "over") return snap.result ? `Match over — ${snap.result}` : "Match over";

  if (me.blind > 0.05) return "You are blind — back off until it clears";

  if (!me.alive)

    return snap.phase === "buy"

      ? "Buy phase — you are back next round"

      : "Waiting for the next round — you're in it";

  if (snap.phase === "end") return snap.result ? `${snap.result} — next round in ${secs(snap.clock)}s` : "Round over";

  if (snap.phase === "buy") return `Buy phase — ${secs(snap.clock)}s left. ${buyWith}`;

  if (me.planting > 0) return `Planting — hold F for ${secs(4 - me.planting)}s more`;

  if (spike.planted) {

    if (me.side === "def") {

      if (spike.defuse > 0) return `Defusing — keep holding F, ${secs(7 - spike.defuse)}s`;

      return nearSpike

        ? `Spike down, ${secs(spike.fuse)}s — hold F to defuse`

        : `Spike down, ${secs(spike.fuse)}s — get to it and hold F`;

    }

    return `Spike down, ${secs(spike.fuse)}s — keep them off it`;

  }

  if (me.side === "atk") {

    if (me.spike) return onSite ? "Hold F to plant" : "You have the spike — get to site A or B";

    if (spike.carried) return "Your team has the spike — go with them and take a site";

    if (nearSpike) return "Walk onto the spike to pick it up";

    return "Somebody has to carry the spike — it is on the ground";

  }

  return `Defending — hold A and B, ${secs(snap.clock)}s`;

}