import type {
  CreatePlaylistRequest,
  ReorderPlaylistRequest,
  UpdatePlaylistRequest,
} from "../../shared/playlist.ts";
import { VALIDATION } from "../../shared/validation.ts";

export function isCreatePlaylistRequest(
  obj: unknown,
): obj is CreatePlaylistRequest {
  if (
    !obj || typeof obj !== "object" ||
    !("title" in obj) || typeof obj.title !== "string" ||
    !("isPublic" in obj) || typeof obj.isPublic !== "boolean"
  ) return false;
  const o = obj as Record<string, unknown>;
  if (
    (o.title as string).length === 0 ||
    (o.title as string).length > VALIDATION.PLAYLIST_TITLE_MAX
  ) return false;
  if (
    "description" in o && typeof o.description !== "string" &&
    o.description !== null
  ) return false;
  if (
    typeof o.description === "string" &&
    (o.description as string).length > VALIDATION.PLAYLIST_DESCRIPTION_MAX
  ) return false;
  return true;
}

export function isUpdatePlaylistRequest(
  obj: unknown,
): obj is UpdatePlaylistRequest {
  if (!obj || typeof obj !== "object") return false;
  const o = obj as Record<string, unknown>;
  if ("title" in o) {
    if (typeof o.title !== "string") return false;
    if (
      (o.title as string).length === 0 ||
      (o.title as string).length > VALIDATION.PLAYLIST_TITLE_MAX
    ) return false;
  }
  if (
    "description" in o && typeof o.description !== "string" &&
    o.description !== null
  ) return false;
  if (
    typeof o.description === "string" &&
    (o.description as string).length > VALIDATION.PLAYLIST_DESCRIPTION_MAX
  ) return false;
  if ("isPublic" in o && typeof o.isPublic !== "boolean") return false;
  return true;
}

export function isReorderPlaylistRequest(
  obj: unknown,
): obj is ReorderPlaylistRequest {
  return !!obj && typeof obj === "object" &&
    "dumpIds" in obj && Array.isArray(obj.dumpIds) &&
    (obj.dumpIds as unknown[]).every((id) => typeof id === "string");
}