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// Copyright (c) 2025 Cloudflare, Inc.
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// Licensed under the Apache 2.0 license found in the LICENSE file or at:
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//     https://opensource.org/licenses/Apache-2.0
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let frCounter = 0;
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let weakRefState = { isDereferenced: false, value: null };
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const fr = new FinalizationRegistry(() => {
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  ++frCounter;
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});
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export default {
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  async fetch(request, env, ctx) {
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    const url = new URL(request.url);
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    const test = url.searchParams.get('test') || 'fr';
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    if (test === 'fr') {
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      // Test FinalizationRegistry
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      (function () {
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        fr.register({}, '');
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      })();
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      // Ensure obj gets GC'd
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      gc();
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      if (frCounter > 0) {
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        await scheduler.wait(10);
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      }
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      return new Response(frCounter.toString());
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    } else if (test === 'weakref') {
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      // Test WeakRef
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      if (url.searchParams.has('create')) {
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        const obj = { message: "I'm alive!" };
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        const ref = new WeakRef(obj);
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        // Store the WeakRef for later testing
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        weakRefState.ref = ref;
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        weakRefState.isDereferenced = false;
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        weakRefState.value = ref.deref()?.message || null;
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        return Response.json({
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          created: true,
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          value: weakRefState.value,
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        });
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      }
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      if (url.searchParams.has('gc')) {
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        // Force garbage collection and check if the WeakRef has been cleared
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        gc();
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        await scheduler.wait(10); // Give GC time to clean up
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      }
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      // Just return the current state
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      const value = weakRefState.ref?.deref()?.message || null;
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      weakRefState.isDereferenced = value === null;
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      weakRefState.value = value;
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      return Response.json({
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        isDereferenced: weakRefState.isDereferenced,
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        value: weakRefState.value,
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      });
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    }
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    return new Response('Invalid test', { status: 400 });
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  },
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};