import * as planck from 'planck'
import { Action } from "./Action"
import { Entity } from "./Entity"

export class PlayerEntity extends Entity {
  action?: Action
  constructor(ctor: string) {
    super(ctor)
  }
  act(actions: Action[]) {
    this.action = actions.sort((a, b) => {
      if (a.priority < b.priority) {
        return -1
      }
      if (a.priority > b.priority) {
        return 1
      }
      return 0
    })[0]
  }
  update(delta: number) {
    if (this.action) {
      // FIXME: Use physics.
      let shouldMove = false
      switch(this.action.type) {
        case 'west':
          if (this.direction !== 0) {
            if (this.direction < 180) {
              this.direction -= this.turnRate
            } else {
              this.direction += this.turnRate
            }
          }
          shouldMove = true
          break
        case 'east':
          if (this.direction !== 180) {
            if (this.direction < 180) {
              this.direction += this.turnRate
            } else {
              this.direction -= this.turnRate
            }
          }
          shouldMove = true
          break
        case 'north':
          if (this.direction !== 90) {
            if (this.direction < 90 || this.direction > 270) {
              this.direction += this.turnRate
            } else {
              this.direction -= this.turnRate
            }
          }
          shouldMove = true
          break
        case 'south':
          if (this.direction !== 270) {
            if (this.direction > 90 && this.direction < 270) {
              this.direction += this.turnRate
            } else {
              this.direction -= this.turnRate
            }
          }
          shouldMove = true
          break
      }
      if (this.direction > 360) {
        this.direction = 0
      } else if (this.direction < 0) {
        this.direction = 360
      }
      if (shouldMove) {
        let r = this.direction * (Math.PI/180)
        if (Math.abs(this.velocity[0]) < this.maxSpeed) {
          this.velocity[0] -= Math.cos(r) * this.acceleration
        }
        if (Math.abs(this.velocity[1]) < this.maxSpeed) {
          this.velocity[1] -= Math.sin(r) * this.acceleration
        }
        let cardinal = this.getCardinal()
        if (this.sprite.subsetKey !== cardinal) {
          this.sprite.setCtor(`${this.sprite.spriteKey}.${this.sprite.animationKey}.${this.sprite.setKey}.${cardinal}.${this.sprite.frameIndex}`)
        }
      }
    }

    //
    this.velocity[0] *= 0.5
    this.velocity[1] *= 0.5

    // Eh... let's manually handle velocity
    this.body?.setLinearVelocity(planck.Vec2(this.velocity[0], this.velocity[1]))
  }
  getCardinal(): string {
    const degreesPerDirection = 360 / 8
    const angle = this.direction + degreesPerDirection / 2

    if (angle >= 0 * degreesPerDirection && angle < 1 * degreesPerDirection) {
      return 'w'
    } else if (angle >= 1 * degreesPerDirection && angle < 2 * degreesPerDirection) {
      return 'nw'
    } else if (angle >= 2 * degreesPerDirection && angle < 3 * degreesPerDirection) {
      return 'n'
    } else if (angle >= 3 * degreesPerDirection && angle < 4 * degreesPerDirection) {
      return 'ne'
    } else if (angle >= 4 * degreesPerDirection && angle < 5 * degreesPerDirection) {
      return 'e'
    } else if (angle >= 5 * degreesPerDirection && angle < 6 * degreesPerDirection) {
      return 'se'
    } else if (angle >= 6 * degreesPerDirection && angle < 7 * degreesPerDirection) {
      return 's'
    }
    return 'sw'
  }
}

export function isPlayerEntity(o: any): o is PlayerEntity {
  return o.act
}