feast/src/game/ai.ts

import { Creature } from './creature'
import { Encounter } from './combat'
import { LogEntry } from './interface'
import { ReleaseAction, TransferAction } from './combat/actions'

export interface AI {
  name: string;
  decide (actor: Creature, encounter: Encounter): LogEntry;
}

export class NoAI implements AI {
  name = "No AI"
  decide (actor: Creature, encounter: Encounter): LogEntry {
    throw new Error("This AI cannot be used.")
  }
}

/**
 * The RandomAI is **COMPLETELY** random. Good luck.
 */
export class RandomAI implements AI {
  name = "Random AI"
  decide (actor: Creature, encounter: Encounter): LogEntry {
    const actions = encounter.combatants.flatMap(enemy => actor.validActions(enemy).map(action => ({
      target: enemy,
      action: action
    })))
    const chosen = actions[Math.floor(Math.random() * actions.length)]
    return chosen.action.execute(actor, chosen.target)
  }
}

/**
 * The VoreAI tries to perform moves from its containers
 */
export class VoreAI extends RandomAI {
  name = "Vore AI"
  decide (actor: Creature, encounter: Encounter): LogEntry {
    const actions = encounter.combatants.flatMap(enemy => actor.validActions(enemy).map(action => ({
      target: enemy,
      action: action
    })))
    const voreActions = actions.filter(action => actor.otherContainers.concat(actor.containers).some(container => container.actions.includes(action.action) || action instanceof TransferAction))
    const aggressiveActions = voreActions.filter(action => !(action.action instanceof ReleaseAction))
    const chosen = aggressiveActions[Math.floor(Math.random() * aggressiveActions.length)]
    if (chosen === undefined) {
      return super.decide(actor, encounter)
    }
    return chosen.action.execute(actor, chosen.target)
  }
}