feast/src/game/combat/effects.ts

import { StatusEffect, Damage, DamageType, Action, Condition } from '../combat'
import { DynText, LiveText, ToBe, Verb } from '../language'
import { Creature } from "../creature"
import { LogLine, LogEntry, LogLines, FAElem, nilLog } from '../interface'

export class InstantKillEffect extends StatusEffect {
  constructor () {
    super('Instant Kill', 'Instant kill!', 'fas fa-skull')
  }

  onApply (creature: Creature) {
    creature.vigors.Health = 0
    creature.removeEffect(this)
    return new LogLines(
      new LogLine(
        `${creature.name.capital} ${creature.name.conjugate(new ToBe())} killed instantly! `,
        new FAElem('fas fa-skull')
      ),
      creature.takeDamage(new Damage())
    )
  }
}
export class StunEffect extends StatusEffect {
  constructor (private duration: number) {
    super('Stun', 'Cannot act!', 'fas fa-sun')
    this.desc = new DynText('Stunned for your next ', new LiveText(this, x => x.duration), ' actions!')
  }

  get topLeft () {
    return this.duration.toString()
  }

  onApply (creature: Creature) {
    return new LogLine(`${creature.name.capital}  ${creature.name.conjugate(new ToBe())} is stunned!`)
  }

  onRemove (creature: Creature) {
    return new LogLine(`${creature.name.capital} ${creature.name.conjugate(new ToBe())} no longer stunned.`)
  }

  preTurn (creature: Creature): { prevented: boolean; log: LogEntry } {
    if (--this.duration <= 0) {
      return {
        prevented: true,
        log: new LogLines(
          `${creature.name.capital} ${creature.name.conjugate(new ToBe())} stunned! ${creature.pronouns.capital.subjective} can't move.`,
          creature.removeEffect(this)
        )
      }
    } else {
      return {
        prevented: true,
        log: new LogLines(
          `${creature.name.capital} ${creature.name.conjugate(new ToBe())} stunned! ${creature.pronouns.capital.subjective} can't move!`
        )
      }
    }
  }
}

export class ShieldEffect extends StatusEffect {
  constructor (private damageTypes: DamageType[], private amount: number) {
    super('Shield', 'Block a fraction of incoming damage', 'fas fa-shield-alt')
  }

  onApply (creature: Creature) {
    return new LogLine(`${creature.name.capital} ${creature.name.conjugate(new Verb('gain'))} a shield!`)
  }

  onRemove (creature: Creature) {
    return new LogLine(`${creature.name.capital} ${creature.name.conjugate(new Verb('lose'))} ${creature.pronouns.possessive} shield!`)
  }

  preDamage (creature: Creature, damage: Damage) {
    return damage.scale(this.amount)
  }
}

export class PredatorCounterEffect extends StatusEffect {
  constructor (private devour: Action, private chance: number) {
    super('Predatory Counter', 'Eat them back', 'fas fa-redo')
    this.desc = new DynText(new LiveText(this, x => (x.chance * 100).toFixed(0)), '% chance to devour your attackers')
  }

  preAttack (creature: Creature, attacker: Creature) {
    if (this.devour.allowed(creature, attacker) && Math.random() < this.chance) {
      return {
        prevented: true,
        log: new LogLines(
        `${creature.name.capital} ${creature.name.conjugate(new Verb('surprise'))} ${attacker.name.objective} and ${creature.name.conjugate(new Verb('try', 'tries'))} to devour ${attacker.pronouns.objective}!`,
        this.devour.execute(creature, attacker)
        )
      }
    } else {
      return { prevented: false, log: nilLog }
    }
  }
}

export class UntouchableEffect extends StatusEffect {
  constructor () {
    super('Untouchable', 'Cannot be attacked', 'fas fa-times')
  }

  preAttack (creature: Creature, attacker: Creature) {
    return {
      prevented: true,
      log: new LogLine(`${creature.name.capital} cannot be attacked.`)
    }
  }
}

export class DazzlingEffect extends StatusEffect {
  constructor (private conditions: Condition[]) {
    super('Dazzling', 'Stuns enemies who try to affect this creature', 'fas fa-spinner')
  }

  preReceiveAction (creature: Creature, attacker: Creature) {
    if (this.conditions.every(cond => cond.allowed(creature, attacker))) {
      attacker.applyEffect(new StunEffect(1))
      return {
        prevented: true,
        log: new LogLine(`${attacker.name.capital} can't act against ${creature.name.objective}!`)
      }
    } else {
      return {
        prevented: false,
        log: nilLog
      }
    }
  }
}