import { Injected } from '@polkadot/extension-inject/types'

import { PolkadotExtensionModule } from '../../interfaces'

function getFirstUnknownExtension() {
  if (typeof window !== 'undefined' && window.hasOwnProperty('injectedWeb3')) {
    const unknownExtensionKeys = Object.keys((window as any).injectedWeb3)
    if (unknownExtensionKeys.length) {
      const firstUnknownExtensionKey = unknownExtensionKeys[0]
      const firstUnknownExtension = (window as any).injectedWeb3[firstUnknownExtensionKey]

      return { key: firstUnknownExtensionKey, extension: firstUnknownExtension }
    }
  }
}

export function injectedExtension(): PolkadotExtensionModule | undefined {
  if (typeof window === 'undefined') {
    return
  }

  const firstUnknownExtension = getFirstUnknownExtension()

  return {
    label: firstUnknownExtension != null ? firstUnknownExtension.key : '',
    isEnabled: () => {
      return firstUnknownExtension != null
    },
    getIcon: () =>
      'data:image/svg+xml;base64,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',
    getInjected: async (appName: string) => {
      if (firstUnknownExtension != null) {
        const injected: Injected = await firstUnknownExtension.extension.enable(appName)

        return {
          injected
        }
      }
    }
  }
}

export default injectedExtension