import { useEffect, useState, useCallback } from 'react'
import { getAlbyService } from '@/lib/alby'

interface AlbyInstallerProps {
  onInstalled?: () => void
}

function InfoIcon(): JSX.Element {
  return (
    <svg
      className="h-5 w-5 text-blue-400"
      xmlns="http://www.w3.org/2000/svg"
      viewBox="0 0 20 20"
      fill="currentColor"
    >
      <path
        fillRule="evenodd"
        d="M18 10a8 8 0 11-16 0 8 8 0 0116 0zm-7-4a1 1 0 11-2 0 1 1 0 012 0zM9 9a1 1 0 000 2v3a1 1 0 001 1h1a1 1 0 100-2v-3a1 1 0 00-1-1H9z"
        clipRule="evenodd"
      />
    </svg>
  )
}

interface InstallerActionsProps {
  onInstalled?: () => void
  markInstalled: () => void
}

function InstallerActions({ onInstalled, markInstalled }: InstallerActionsProps): JSX.Element {
  const connect = useCallback(() => {
    const alby = getAlbyService()
    void alby.enable().then(() => {
      markInstalled()
      onInstalled?.()
    })
  }, [markInstalled, onInstalled])

  return (
    <div className="mt-4">
      <div className="flex flex-col sm:flex-row gap-2">
        <a
          href="https://getalby.com/"
          target="_blank"
          rel="noopener noreferrer"
          className="inline-flex items-center justify-center px-4 py-2 border border-transparent text-sm font-medium rounded-md text-white bg-blue-600 hover:bg-blue-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500"
        >
          Install Alby
        </a>
        <button
          onClick={() => {
            void connect()
          }}
          className="inline-flex items-center justify-center px-4 py-2 border border-blue-300 text-sm font-medium rounded-md text-blue-700 bg-white hover:bg-blue-50 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-blue-500"
        >
          Already installed? Connect
        </button>
      </div>
    </div>
  )
}

function InstallerBody({ onInstalled, markInstalled }: InstallerActionsProps): JSX.Element {
  return (
    <div className="ml-3 flex-1">
      <h3 className="text-sm font-medium text-blue-800">Alby Extension Required</h3>
      <div className="mt-2 text-sm text-blue-700">
        <p>To make Lightning payments, please install the Alby browser extension.</p>
      </div>
      <InstallerActions
        markInstalled={markInstalled}
        {...(onInstalled ? { onInstalled } : {})}
      />
      <div className="mt-3 text-xs text-blue-600">
        <p>Alby is a Lightning wallet that enables instant Bitcoin payments in your browser.</p>
      </div>
    </div>
  )
}

function useAlbyStatus(onInstalled?: () => void): { isInstalled: boolean; isChecking: boolean; markInstalled: () => void } {
  const [isInstalled, setIsInstalled] = useState(false)
  const [isChecking, setIsChecking] = useState(true)

  useEffect(() => {
    const checkAlby = (): void => {
      try {
        const alby = getAlbyService()
        const installed = alby.isEnabled()
        setIsInstalled(installed)
        if (installed) {
          onInstalled?.()
        }
      } catch (e) {
        console.error('Error checking Alby:', e)
        setIsInstalled(false)
      } finally {
        setIsChecking(false)
      }
    }
    checkAlby()
  }, [onInstalled])

  const markInstalled = (): void => {
    setIsInstalled(true)
  }

  return { isInstalled, isChecking, markInstalled }
}

export function AlbyInstaller({ onInstalled }: AlbyInstallerProps): JSX.Element | null {
  const { isInstalled, isChecking, markInstalled } = useAlbyStatus(onInstalled)

  if (isChecking || isInstalled) {
    return null
  }

  return (
    <div className="bg-blue-50 border border-blue-200 rounded-lg p-4 mb-4">
      <div className="flex items-start">
        <div className="flex-shrink-0">
          <InfoIcon />
        </div>
        <InstallerBody
          markInstalled={markInstalled}
          {...(onInstalled ? { onInstalled } : {})}
        />
      </div>
    </div>
  )
}