Project: Production SaaS Architecture တစ်ခု ဒီဇိုင်းဆွဲခြင်း

function designArchitecture({ hasFileUploads, hasBackgroundEmail, expectsTrafficSpikes }) {
  const components = [
    {
      name: "Load balancer + multiple app instances",
      needed: expectsTrafficSpikes,
      reason: "distributes traffic across replicas so a spike doesn't overwhelm a single server",
    },
    {
      name: "CDN in front of the app",
      needed: expectsTrafficSpikes,
      reason: "caches static assets at edge locations, cutting origin load during a spike",
    },
    {
      name: "Object storage (e.g. S3-compatible bucket)",
      needed: hasFileUploads,
      reason: "uploaded files need durable storage outside the app servers, which are disposable",
    },
    {
      name: "Background job queue + worker process",
      needed: hasBackgroundEmail,
      reason: "sending email during the request would block the response; a queue defers it",
    },
    {
      name: "Cache layer (e.g. Redis)",
      needed: expectsTrafficSpikes,
      reason: "absorbs repeated reads so the database isn't hit for every request during a spike",
    },
    {
      name: "Managed production database",
      needed: true,
      reason: "every SaaS app needs durable, backed-up storage for user and subscription data",
    },
    {
      name: "Monitoring and alerting",
      needed: true,
      reason: "you need to know about failures before your users report them, spike or not",
    },
  ];

  const chosen = components.filter((c) => c.needed);

  console.log(`Scenario: uploads=${hasFileUploads}, email=${hasBackgroundEmail}, spikes=${expectsTrafficSpikes}`);
  console.log(`Components needed: ${chosen.length} of ${components.length}\n`);
  for (const c of chosen) {
    console.log(`- ${c.name}\n    reason: ${c.reason}`);
  }

  return chosen.map((c) => c.name);
}

designArchitecture({ hasFileUploads: true, hasBackgroundEmail: true, expectsTrafficSpikes: true });