import { distF, uuidv4 } from './util.js'

class NPC {
    constructor(you) {
        let pos = { x: Math.random() * 1000 - 50, y: Math.random() * 1000 - 50 };
        let vel = { x: 0, y: 0 };

        this.pos = pos;
        this.vel = vel;

        this.you = you || uuidv4();

        this.type = 'NPC';

        this.immortal = true;

        this.posOff = { x: 0, y: 0 };

        this.serverProps = [
            'type', 'pos', 'vel', 'you', 'immortal', 'posOff'
        ];
    }
    handleTick(game) {
        let { entities } = game;

        let rEntity, i = 0;

        while ((!rEntity || rEntity.type != 'Player' || rEntity.health <= 0) && i < 100) {
            rEntity = entities[Math.floor(Math.random() * entities.length)];
            i++;
        }

        let jitter = entities.filter(x => x.type == 'Player' && x && x.health > 0).length;

        if (Math.random() < 0.01) {
            this.posOff.x = (Math.random() * 50 - 25) * jitter;
            this.posOff.y = (Math.random() * 50 - 25) * jitter;
        }

        this.vel.x += (rEntity.pos.x - this.pos.x + this.posOff.x) * 0.0002;
        this.vel.y += (rEntity.pos.y - this.pos.y + this.posOff.y) * 0.0002;

        this.vel.x *= 0.995;
        this.vel.y *= 0.995;

        this.pos.x += this.vel.x;
        this.pos.y += this.vel.y;
    }
}

export default NPC;