feast/src/game/events.ts

import { TargetDrainedVigorCondition } from '@/game/combat/conditions'
import { Creature } from '@/game/creature'
import { LogEntry, LogLines, nilLog } from "@/game/interface"
import { VoreContainer } from '@/game/vore'

// eslint-disable-next-line @typescript-eslint/no-explicit-any
abstract class Relay<Sender, EventMap extends { [name: string]: any }> {
  private subscriptions: { [K in keyof EventMap]: Array<(sender: Sender, args: EventMap[K]) => LogEntry> }

  constructor (private eventNames: Array<keyof EventMap>) {
    const partialSubscriptions: Partial<{ [K in keyof EventMap]?: Array<(sender: Sender, args: EventMap[K]) => LogEntry>}> = {}
    this.eventNames.forEach(name => {
      partialSubscriptions[name] = []
    })
    this.subscriptions = partialSubscriptions as Required<{ [K in keyof EventMap]: Array<(sender: Sender, args: EventMap[K]) => LogEntry> }>
  }

  subscribe<K extends keyof EventMap> (name: K, callback: (sender: Sender, args: EventMap[K]) => LogEntry): void {
    if (this.subscriptions[name] === undefined) {
      this.subscriptions[name] = []
    }
    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
    this.subscriptions[name]!.push(callback)
  }

  dispatch<K extends keyof EventMap> (name: K, sender: Sender, args: EventMap[K]): LogEntry {
    const subscriptionList = this.subscriptions[name]
    if (subscriptionList !== undefined) {
      return new LogLines(...subscriptionList.map(sub => sub(sender, args)))
    } else {
      return nilLog
    }
  }

  connect<ParentEventMap extends EventMap> (parent: Relay<Sender, ParentEventMap>): void {
    this.eventNames.forEach(name => {
      parent.subscribe(name, (sender, args) => this.dispatch(name, sender, args))
    })
  }
}

type VoreMap = {
  "onEaten": { prey: Creature };
  "onReleased": { prey: Creature };
  "onDigested": { prey: Creature };
  "onAbsorbed": { prey: Creature };
}

export class VoreRelay extends Relay<VoreContainer, VoreMap> {
  constructor () {
    super(["onEaten", "onReleased", "onDigested", "onAbsorbed"])
  }
}