import {z} from 'zod'

export type GetApiMatrixClientV3EventsArgs = {from?: string | undefined, timeout?: number | undefined, room_id: string};

export type GetApiMatrixClientV3EventsOptions = {baseUrl?: string | undefined, accessTokenQuery?: string | undefined, fetch?: typeof fetch | undefined};

export const getApiMatrixClientV3EventsResponse = z.object({chunk: z.array(z.object({content: z.object({}), event_id: z.string(), origin_server_ts: z.number().int(), sender: z.string(), state_key: z.string().optional(), type: z.string(), unsigned: z.object({age: z.number().int().optional(), membership: z.string().optional(), prev_content: z.object({}).optional(), redacted_because: z.object({}).optional(), replaces_state: z.string().optional(), transaction_id: z.string().optional()}).optional(), room_id: z.string()})).optional(), end: z.string().optional(), start: 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
};

/**
 * Listen on the event stream of a particular room.
 * 
 * GET /_matrix/client/v3/events 
 * 
 * Also accepts auth: accessTokenBearer
 */
export const getApiMatrixClientV3Events = async (args: GetApiMatrixClientV3EventsArgs, options?: GetApiMatrixClientV3EventsOptions) => {
const {baseUrl = "https://matrix.org", fetch: fetchFn = fetch, accessTokenQuery} = options ?? {}

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

if (args.from != null) query.append("from", String(args.from))
if (args.timeout != null) query.append("timeout", String(args.timeout))
if (args.room_id != null) query.append("room_id", String(args.room_id))
if (accessTokenQuery !== undefined) query.set("access_token", accessTokenQuery)

const url = `${baseUrl.replace(/\/+$/, '')}/_matrix/client/v3/events ${query.size > 0 ? `?${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(getApiMatrixClientV3EventsResponse, await res.json())
};