import {z} from 'zod'

export type GetApiMatrixClientV3CapabilitiesOptions = {baseUrl?: string | undefined, accessTokenQuery?: string | undefined, fetch?: typeof fetch | undefined};

export const getApiMatrixClientV3CapabilitiesResponse = z.object({capabilities: z.object({"m.3pid_changes": z.object({enabled: z.boolean()}).optional(), "m.account_moderation": z.object({lock: z.boolean().optional(), suspend: z.boolean().optional()}).optional(), "m.change_password": z.object({enabled: z.boolean()}).optional(), "m.forget_forced_upon_leave": z.object({enabled: z.boolean()}).optional(), "m.get_login_token": z.object({enabled: z.boolean()}).optional(), "m.profile_fields": z.object({allowed: z.array(z.string()).optional(), disallowed: z.array(z.string()).optional(), enabled: z.boolean()}).optional(), "m.room_versions": z.object({available: z.record(z.string(), z.enum(["stable", "unstable"])), default: z.string()}).optional(), "m.set_avatar_url": z.object({enabled: z.boolean()}).optional(), "m.set_displayname": z.object({enabled: z.boolean()}).optional()}).and(z.record(z.string(), z.unknown()))});

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 information about the server's capabilities.
 * 
 * GET /_matrix/client/v3/capabilities
 * 
 * Also accepts auth: accessTokenBearer
 */
export const getApiMatrixClientV3Capabilities = async (options?: GetApiMatrixClientV3CapabilitiesOptions) => {
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/capabilities${query.size > 0 ? `?${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(getApiMatrixClientV3CapabilitiesResponse, await res.json())
};