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import { PermissionFlags } from '../../mod.ts'import { Constants } from '../types/constants.ts'import type { OAuthScope } from '../types/oauth.ts'import { Permissions } from './permissions.ts'
export interface OAuthURLOptions {  clientID: string  scopes: OAuthScope[]  permissions?:    | string    | bigint    | Permissions    | Array<keyof typeof PermissionFlags | bigint>  redirectURI?: string}
export function createOAuthURL(options: OAuthURLOptions): string {  if (options.scopes.length < 1)    throw new Error('Must provide at least one scope')
  const params = new URLSearchParams({    client_id: options.clientID,    scopes: [...new Set(options.scopes)].join(' ')  })
  if (options.permissions !== undefined) {    let perms: string
    if (      typeof options.permissions === 'string' ||      typeof options.permissions === 'bigint'    ) {      perms = String(options.permissions)    } else if (      typeof options.permissions === 'object' &&      options.permissions !== null &&      options.permissions instanceof Permissions    ) {      perms = String(options.permissions.bitfield)    } else if (Array.isArray(options.permissions)) {      let acum = 0n      for (const perm of options.permissions) {        if (typeof perm === 'string') {          const flag = PermissionFlags[perm]          if (typeof flag !== 'number')            throw new TypeError(`Invalid Permission Flag: ${flag}`)          acum |= flag        } else if (typeof perm === 'bigint') {          acum |= perm        } else throw new TypeError('Unexpected value in permissions array')      }      perms = String(acum)    } else throw new TypeError(`Unexpected value for permissions`)    params.set('permissions', perms)  }
  if (options.permissions === undefined && options.scopes.includes('bot')) {    params.set('permissions', '0')  }
  if (typeof options.redirectURI === 'string') {    params.set('redirect_uri', options.redirectURI)  }
  return `${Constants.DISCORD_API_URL}/v${    Constants.DISCORD_API_VERSION  }/oauth2/authorize?${params.toString()}`}