import {z} from 'zod'

export type GetApiSchemasArgs = {catalogName?: string | undefined, maxResults?: number | undefined, pageToken?: string | undefined, includeBrowse?: boolean | undefined};

export type GetApiSchemasOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

export const schemaInfo = z.object({name: z.string(), catalogName: z.string(), comment: z.string().optional(), properties: z.object({}).optional(), fullName: z.string().optional(), owner: z.string().optional(), createdAt: z.string().optional(), createdBy: z.string().optional(), updatedAt: z.string().optional(), updatedBy: z.string().optional(), schemaId: z.string().optional()});

export const listSchemasResponse = z.object({schemas: z.array(schemaInfo).optional(), nextPageToken: z.string().optional()});

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * Gets an array of schemas for a catalog in the metastore. If the caller is the metastore
 * 
 * GET /schemas
 */
export const getApiSchemas = async (args: GetApiSchemasArgs, options: GetApiSchemasOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('accept', "application/json")

if (args.catalogName != null) query.append("catalogName", String(args.catalogName))
if (args.maxResults != null) query.append("maxResults", String(args.maxResults))
if (args.pageToken != null) query.append("pageToken", String(args.pageToken))
if (args.includeBrowse != null) query.append("includeBrowse", String(args.includeBrowse))

const url = `${baseUrl.replace(/\/+$/, '')}/schemas${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", headers})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(listSchemasResponse, await res.json())
};