import { Vector2 } from 'three'
import Projectile from './projectile.js'

export default class Effect {
  static damage({ despawn }) {
    return function(projectile, entity) {
      entity.damage(10, this)
      if (despawn) {
        projectile.despawn()
      }
    }
  }

  static skillshot({ range, radius, speed, onCollide, after }) {
    return function(cursor) {
      const projectile = new Projectile()
      const destination = this.position.clone().add(cursor.clone().sub(this.position).normalize().multiplyScalar(range))
      projectile.owner = this.id
      projectile.position.copy(this.position)
      projectile.destination = destination
      projectile.radius = radius
      projectile.speed = speed
      projectile.after = after
      projectile.onCollide = onCollide
      this.game?.spawnProjectile(projectile)
    }
  }

  static homingProjectile({ range, radius, speed, onCollide, after }) {
    return function(cursor) {
      let closest = null
      let distance = Infinity
      this.game?.entities.filter((e) => e.id != this.id && e.position.clone().sub(this.position).length() < range).forEach((e) => {
        const newDistance = e.position.clone().sub(cursor).length() < distance
        if (newDistance < distance) {
          closest = e
          distance = newDistance
        }
      })

      if (closest == null) { return } // TODO: refund

      const projectile = new Projectile()
      projectile.owner = this.id
      projectile.position.copy(this.position)
      projectile.homingTarget = closest
      projectile.radius = radius
      projectile.speed = speed
      projectile.after = after
      projectile.onCollide = onCollide
      this.game?.spawnProjectile(projectile)
    }
  }
}