import {z} from 'zod'

export type GetApiMatrixClientV3ThirdpartyProtocolProtocolArgs = {protocol: string};

export type GetApiMatrixClientV3ThirdpartyProtocolProtocolOptions = {baseUrl?: string | undefined, accessTokenQuery?: string | undefined, fetch?: typeof fetch | undefined};

export const getApiMatrixClientV3ThirdpartyProtocolProtocolResponse = z.object({field_types: z.record(z.string(), z.object({placeholder: z.string(), regexp: z.string()})), icon: z.string(), location_fields: z.array(z.string()), user_fields: z.array(z.string()), instances: z.array(z.object({desc: z.string(), fields: z.object({}), icon: z.string().optional(), network_id: z.string(), instance_id: 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
};

/**
 * Retrieve metadata about a specific protocol that the homeserver supports.
 * 
 * GET /_matrix/client/v3/thirdparty/protocol/{protocol}
 * 
 * Also accepts auth: accessTokenBearer
 */
export const getApiMatrixClientV3ThirdpartyProtocolProtocol = async (args: GetApiMatrixClientV3ThirdpartyProtocolProtocolArgs, options?: GetApiMatrixClientV3ThirdpartyProtocolProtocolOptions) => {
const {baseUrl = "https://matrix.org", fetch: fetchFn = fetch, accessTokenQuery} = options ?? {}

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

if (accessTokenQuery !== undefined) query.set("access_token", accessTokenQuery)

const url = `${baseUrl.replace(/\/+$/, '')}/_matrix/client/v3/thirdparty/protocol/${encodeURIComponent(String(args.protocol))}${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(getApiMatrixClientV3ThirdpartyProtocolProtocolResponse, await res.json())
};