// resolveLink — resolve a short code to its destination URL (the read side of
// a link shortener; `shareLink` is the write side).
//
// Demonstrates: GET with a query param, a lookup, and a 404 via
// `ServerlessHttpError` when the code is unknown. Swap the in-memory map for a
// KV / D1 / database read in a real shortener — the shape stays the same.
//
//   curl 'http://localhost:8910/?code=docs'

import { Effect, Schema } from 'effect'
import { defineServerless, ServerlessHttpError } from '@voltro/serverless'

const LINKS: Record<string, string> = {
  docs: 'https://voltro.dev/docs',
  gh: 'https://github.com/SinPP',
  home: 'https://voltro.dev',
}

export default defineServerless({
  name: 'resolve-link',
  method: 'GET',
  input: Schema.Struct({ code: Schema.String.pipe(Schema.minLength(1)) }),
  output: Schema.Struct({ code: Schema.String, url: Schema.String }),
  handler: ({ code }, _ctx) =>
    Effect.gen(function* () {
      const url = LINKS[code.toLowerCase()]
      if (!url) {
        return yield* Effect.fail(new ServerlessHttpError({ status: 404, message: 'unknown-code', detail: code }))
      }
      return { code, url }
    }),
})