declare global {
  // oxlint-disable-next-line no-underscore-dangle -- established flag name
  var __SANITY_STAGING__: boolean | undefined;
}

/**
 * Returns the Sanity domain based on the `__SANITY_STAGING__` runtime-time flag.
 * If the flag is set to `true`, the staging domain is returned.
 * Otherwise, the production domain is returned.
 *
 * @public
 */
export function getSanityDomain(): string {
  if (getSanityEnv() === "staging") {
    return "sanity.work";
  }
  return "sanity.io";
}

/**
 * Returns the API host based on the `__SANITY_STAGING__` runtime-time flag.
 * If the flag is set to `true`, the staging API host is returned.
 * Otherwise, the production API host is returned.
 *
 * @public
 */
export function getApiHost(): string | undefined {
  return `https://api.${getSanityDomain()}`;
}

/**
 * Returns the domain brett applications are served from — an application
 * deployed through the new `/applications` API lives at `<slug>-apps-<org-id>`,
 * a different URL from the legacy studio domain.
 *
 * @public
 */
export function getApplicationDomain(): string {
  return getSanityEnv() === "production" ? "sanity.run" : "run.sanity.work";
}

/**
 * Returns the current Sanity environment based on the `__SANITY_STAGING__` runtime-time flag.
 * If the flag is set to `true`, "staging" is returned.
 * Otherwise, "production" is returned.
 *
 * @public
 */
export function getSanityEnv(): "staging" | "production" {
  // Read via globalThis on purpose: bundler `define` inlines a bare
  // `__SANITY_STAGING__`, locking chunks to the env they were built in
  // rather than the one the host page runs in.
  // oxlint-disable-next-line no-underscore-dangle -- established flag name
  return globalThis.__SANITY_STAGING__ === true ? "staging" : "production";
}