import { DurableObject } from 'cloudflare:workers';

export default {
  async fetch(request, env) {
    const url = new URL(request.url);
    const counterName = url.searchParams.get('name');
    if (!counterName) return new Response('missing ?name', { status: 400 });

    const counterStub = env.COUNTERS.getByName(counterName);

    let count;
    switch (url.pathname) {
      case '/increment':
        count = await counterStub.increment();
        break;
      case '/decrement':
        count = await counterStub.decrement();
        break;
      case '/':
        count = await counterStub.get();
        break;
      default:
        return new Response('not found', { status: 404 });
    }
    return new Response(`${count}`);
  },
};

export class Counter extends DurableObject {
  async get() {
    return (await this.ctx.storage.get('value')) ?? 0;
  }
  async increment(amount = 1) {
    const newValue = (await this.get()) + amount;
    await this.ctx.storage.put('value', newValue);
    return newValue;
  }
  async decrement(amount = 1) {
    const newValue = (await this.get()) - amount;
    await this.ctx.storage.put('value', newValue);
    return newValue;
  }
}