import {z} from 'zod'

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

export const getApiWellKnownMatrixClientResponse = z.object({"m.homeserver": z.object({base_url: z.string().optional()}).optional(), "m.identity_server": z.object({base_url: z.string().optional()}).optional(), "org.matrix.msc3575.proxy": z.object({url: z.string().optional()}).optional(), "m.federated_identity_services": z.object({base_urls: z.array(z.string()).optional()}).nullable().optional(), "t.server": z.object({base_url: z.string().optional(), server_name: z.string().optional()}).optional(), "m.integrations": z.object({jitsi: z.object({preferredDomain: z.string().optional(), baseUrl: z.string().optional(), useJwt: z.boolean().optional(), jwt: z.object({algorithm: z.string().optional(), secret: z.string().optional(), issuer: z.string().optional()}).nullable().optional()}).optional()}).optional(), "m.authentication": z.object({issuer: z.string().optional()}).nullable().optional(), "app.twake.chat": z.object({default_homeserver: z.string().optional(), homeserver: z.string().optional(), common_settings: z.object({enabled: z.boolean().optional()}).optional(), matrix_profile_updates_allowed: z.boolean().optional(), application_name: z.string().optional(), application_welcome_message: z.string().optional(), privacy_url: z.string().optional(), render_html: z.boolean().optional(), hide_redacted_events: z.boolean().optional(), hide_unknown_events: z.boolean().optional(), issue_id: z.string().optional(), registration_url: z.string().optional(), twake_workplace_homeserver: z.string().optional(), app_grid_dashboard_available: z.boolean().optional(), platform: z.string().optional(), default_max_upload_avatar_size_in_bytes: z.string().optional(), dev_mode: z.boolean().optional(), qr_code_download_url: z.string().optional(), enable_logs: z.boolean().optional(), support_url: z.string().optional(), enable_invitations: z.boolean().optional()}).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
};

/**
 * Get server metadata for auto-configuration
 * 
 * GET /.well-known/matrix/client
 */
export const getApiWellKnownMatrixClient = async (options: GetApiWellKnownMatrixClientOptions) => {
const {baseUrl, fetch: fetchFn = fetch, bearerAuth} = options ?? {}

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

if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/.well-known/matrix/client${query.size > 0 ? `?${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(getApiWellKnownMatrixClientResponse, await res.json())
};