@jeremyckahn/farmhand/src/game-logic/reducers/placeFarmhandShuffleWager.ts

A farming game

import { moneyTotal } from '../../utils/moneyTotal.js'

/**
 * Places a wager for a new Farmhand Shuffle match (see levels.ts for the
 * unlock). The wager is deducted from the player's money immediately, up
 * front, so that a player who walks away mid-match doesn't lose (or need to
 * re-pay) their stake: the match is checkpointed and can be resumed.
 *
 * A wager of 0 is valid and proceeds normally (a free match still plays out
 * and can still be won/lost/drawn - see settleFarmhandShuffleMatch.ts).
 */
export const placeFarmhandShuffleWager = (
  state: farmhand.state,
  wager: number
): farmhand.state => {
  const { farmhandShuffle, money } = state

  // Only one wager can be live at a time: a second call while a match is in
  // progress would charge again and discard the match's checkpoint.
  if (
    farmhandShuffle.isMatchInProgress ||
    !Number.isFinite(wager) ||
    wager < 0 ||
    wager > money
  ) {
    return state
  }

  return {
    ...state,
    money: moneyTotal(money, -wager),
    farmhandShuffle: {
      ...farmhandShuffle,
      wager,
      isMatchInProgress: true,
      serializedMatch: null,
    },
  }
}