import { Terrain } from "../../Terrain"
import type { Mesh } from "../../../engine/scene/Mesh"
import type { Mob } from "../Mob"
import type { Entity } from "../../../engine/scene/Actor"
import { ellipsoid, nextRand, ovoidZ, wanderHeading, wing } from "./mobkit"

export const bee: Entity<Mob, Terrain> = {
  name: "bee",
  build,
  update,
  boundingRadius: 0.5,
  bodyHeight: 0.5,
}

const LEASH = 6
const SPEED = 1.7
const TURN_MIN = 0.4
const TURN_SPAN = 1
const HOVER = 1.1
const BOB_AMP = 0.18
const BOB_FREQ = 3

function build(mesh: Mesh): void {
  // Fore-aft ovoid body striped along its length, a dark head at the front, two
  // pale wings. UVs: bee texture is stripe bands (left), head-dark (mid), wing-pale
  // (right); the body maps v along z so the stripes band across it.
  ovoidZ(mesh, -0.4, 0.4, 0.24, 7, 5, 0, 0.54, 0, 1)
  ellipsoid(mesh, 0, 0.02, 0.44, 0.16, 0.16, 0.16, 5, 4, 0.6, 0.79, 0, 1)
  wing(mesh, 1, 0.83, 0.99, 0, 1)
  wing(mesh, -1, 0.83, 0.99, 0, 1)
}

function update(mob: Mob, dt: number, terrain: Terrain): void {
  mob.phase += dt
  mob.timer -= dt
  if (mob.timer <= 0) {
    mob.heading = wanderHeading(mob, LEASH, 1.4)
    mob.timer = TURN_MIN + nextRand(mob) * TURN_SPAN
  }
  mob.position.x += Math.sin(mob.heading) * SPEED * dt
  mob.position.z += Math.cos(mob.heading) * SPEED * dt
  const ground = Terrain.height(terrain, mob.position.x, mob.position.z)
  mob.position.y = ground + HOVER + Math.sin(mob.phase * BOB_FREQ) * BOB_AMP
}