import * as l from "@cerulea/lexicon";

export const Star = l.record("site.hackery.stars.star", { key: "tid" }, {
  url: l.stringWith({ format: "uri", maxLength: 2048 }),
  title: l.optional(l.stringWith({ maxLength: 2048 })),
  comment: l.optional(l.stringWith({ maxGraphemes: 32768 })),
  createdAt: l.datetime,
});
export type Star = l.Infer<typeof Star>;

export const Follow = l.record("site.hackery.stars.follow", { key: "tid" }, {
  subject: l.did,
  createdAt: l.datetime,
});
export type Follow = l.Infer<typeof Follow>;

export const Profile = l.object({
  avatar: l.optional(
    l.blob({ accept: ["image/png", "image/jpeg", "image/webp", "image/gif"] }),
  ),
});

// A star's link as it will be stored: a bare http(s) URL short enough for the record.
export function starUrl(raw: string | undefined): string | undefined {
  const url = URL.parse(raw ?? "");
  const usable = url && ["http:", "https:"].includes(url.protocol) &&
    url.hostname && !url.username && !url.password && url.href.length <= 2048;
  return usable ? url.href : undefined;
}

export type Did = `did:${string}:${string}`;
// Only PLC and web DIDs can be resolved here.
export const isDid = (value: string | undefined): value is Did =>
  /^did:(plc|web):[a-zA-Z0-9.:%_-]+$/.test(value ?? "");

export type AtUri = { did: string; collection: string; rkey: string };
export const atUri = ({ did, collection, rkey }: AtUri) =>
  `at://${did}/${collection}/${rkey}`;

// Our collections all use TID keys, so anything else is rejected.
export function parseAtUri(uri: string | undefined): AtUri | undefined {
  const [, did, collection, rkey] =
    /^at:\/\/(did:[^/]+)\/([^/]+)\/([234567a-z]{13})$/.exec(uri ?? "") ?? [];
  if (did && l.atUri.validate(uri).success) return { did, collection, rkey };
}