import { horFlexClasses } from '@freesewing/utils'
import { roles } from '@freesewing/config'
//Hooks
import React, { useEffect, useState } from 'react'
import { useAccount } from '@freesewing/react/hooks/useAccount'
import { useBackend } from '@freesewing/react/hooks/useBackend'
// Components
import { Link as DefaultLink } from '@freesewing/react/components/Link'
import { LockIcon, PlusIcon } from '@freesewing/react/components/Icon'
import { Spinner } from '@freesewing/react/components/Spinner'
import { Popout } from '@freesewing/react/components/Popout'
import { H3 } from '@freesewing/react/components/Heading'
import { Consent } from '@freesewing/react/components/Account'

const Wrap = ({ children }) => (
  <div className="tw:m-auto tw:max-w-xl tw:text-center tw:mt-8 tw:p-8">{children}</div>
)

const ContactSupport = ({ Link = false }) => {
  if (!Link) Link = DefaultLink

  return (
    <div className="tw:flex tw:flex-row tw:items-center tw:justify-center tw:gap-4 tw:mt-8">
      <Link href="/support" className="tw:daisy-btn tw:daisy-btn-success tw:w-full">
        Contact Support
      </Link>
    </div>
  )
}

const AuthRequired = ({ Link, banner }) => {
  if (!Link) Link = DefaultLink

  return (
    <Wrap>
      {banner}
      <H3>Authentication Required</H3>
      <p>This functionality requires a FreeSewing account</p>
      <div className="tw:grid tw:grid-cols-1 tw:md:grid-cols-2 tw:gap-2 tw:mt-8">
        <Link
          href="/signup"
          className={`${horFlexClasses} tw:daisy-btn tw:daisy-btn-secondary tw:w-full`}
        >
          <PlusIcon />
          Sign Up
        </Link>
        <Link
          href="/signin"
          className={`${horFlexClasses} tw:daisy-btn tw:daisy-btn-secondary tw:daisy-btn-outline tw:w-full`}
        >
          <LockIcon />
          Sign In
        </Link>
      </div>
    </Wrap>
  )
}

const AccountInactive = ({ Link, banner }) => {
  if (!Link) Link = DefaultLink

  return (
    <Wrap>
      {banner}
      <H3>Account Inactive</H3>
      <p>You must activate your account via the signup link we sent you.</p>
      <p>If you cannot find the link, you can receive a new one by signing up again.</p>
      <div className="tw:flex tw:flex-row tw:items-center tw:justify-center tw:gap-4 tw:mt-8">
        <Link href="/signup" className="tw:daisy-btn tw:daisy-btn-primary tw:w-full">
          Sign Up
        </Link>
      </div>
    </Wrap>
  )
}

const AccountDisabled = ({ banner }) => (
  <Wrap>
    {banner}
    <H3>Acccount Disabled</H3>
    <p>
      You cannot re-enable a disabled account. You need to contact support to resolve this
      situation.
    </p>
    <ContactSupport />
  </Wrap>
)

const AccountProhibited = ({ banner }) => (
  <Wrap>
    {banner}
    <H3>Your account has been disabled</H3>
    <p>Your account has been administratively disabled.</p>
    <ContactSupport />
  </Wrap>
)

const AccountStatusUnknown = ({ banner }) => (
  <Wrap>
    {banner}
    <H3>Account status warning</H3>
    <p>Your account status prohibits us from processing your data. Please contact support.</p>
    <ContactSupport />
  </Wrap>
)

const RoleLacking = ({ requiredRole, role, banner }) => (
  <Wrap>
    {banner}
    <H3>You lack the required role to access this content</H3>
    <p>
      This content requires the <b>{requiredRole}</b> role. Your role is <b>{role}</b> which does
      not grant you access to this content.
    </p>
    <ContactSupport />
  </Wrap>
)

const ConsentLacking = ({ banner, refresh }) => {
  const { setAccount, setToken, setSeenUser } = useAccount()
  const backend = useBackend()

  const updateConsent = async ({ consent1, consent2 }) => {
    let consent = 0
    if (consent1) consent = 1
    if (consent1 && consent2) consent = 2
    if (consent > 0) {
      const result = await backend.updateConsent(consent)
      if (result.success) {
        setToken(result.data.token)
        setAccount({ ...result.data.account, bestBefore: Date.now() + 3600000 })
        setSeenUser(result.data.account.username)
        refresh()
      } else {
        console.log('something went wrong', result)
        refresh()
      }
    }
  }

  return (
    <Wrap>
      <div className="tw:text-left">
        {banner}
        <Popout type="warning">
          <h2>Your account lacks consent</h2>
          <p>
            This should have been taken care of when onboarding your account, but due to a earlier
            bug in the registration, a small subsection of accounts ended up in this state.
          </p>
          <p>
            Please complete the form to give your consent, that may resolve the matter.
            <br />
            If it does not, please <a href="/support">contact support</a> so we may help you.
          </p>
        </Popout>
        <h1>Consent & Privacy</h1>
        <Consent submit={updateConsent} />
      </div>
    </Wrap>
  )
}

/**
 * A component to block access based on a FreeSewing role.
 *
 * Note that in an SPA, blocking access to the user is merely a matter of providing a
 * more intuitive UI. That actual access control is implemented on the backend.
 *
 * @component
 * @param {object} props - All component props
 * @param {React.FC} [props.Link = false] - An optional framework-specific Link component
 * @param {string} [props.role = admin] - The role required to access the content. Typically admin or user.
 * @param {JSX.Element} props.children - The component children, will be rendered if props.js is not set
 * @returns {JSX.Element}
 */
export const RoleBlock = ({ children, role = 'admin', Link = false }) => {
  if (!Link) Link = DefaultLink
  const requiredRole = role

  const { account, setAccount, token, admin, stopImpersonating, signOut } = useAccount()
  const backend = useBackend()

  const [ready, setReady] = useState(false)
  const [impersonating, setImpersonating] = useState(false)
  const [error, setError] = useState(false)
  const [refreshCount, setRefreshCount] = useState(0)

  /*
   * Avoid hydration errors
   */
  useEffect(() => {
    if (admin?.account?.username && account?.username && !impersonating.admin)
      setImpersonating({
        admin: admin.account.username,
        user: account.username,
      })
  }, [admin])

  useEffect(() => {
    const verifyUser = async () => {
      if (!error) {
        const [status, data] = await backend.ping()
        if (status === 200 && data.result === 'success') {
          // Refresh account in local storage
          setAccount({
            ...account,
            ...data.account,
            bestBefore: Date.now() + 3600000,
          })
        } else if (status === 451) setError('consentLacking')
        else {
          if (data?.error?.error) setError(data.error.error)
          else signOut()
        }
        setReady(true)
      }
    }
    // Don't hammer the backend. Check once per hour.
    if (token && !error && (!account.bestBefore || account.bestBefore < Date.now())) verifyUser()
    setReady(true)
  }, [admin, refreshCount, signOut])

  const refresh = () => {
    setRefreshCount(refreshCount + 1)
    setError(false)
  }

  if (!ready) <Spinner />

  const banner = impersonating ? (
    <div className="tw:bg-warning tw:rounded-lg tw:shadow tw:py-4 tw:px-6 tw:flex tw:flex-row tw:items-center tw:gap-4 tw:justify-between">
      <span className="tw:text-base-100 tw:text-left">
        Hi <b>{impersonating.admin}</b>, you are currently impersonating <b>{impersonating.user}</b>
      </span>
      <button className="tw:daisy-btn tw:daisy-btn-neutral" onClick={stopImpersonating}>
        Stop Impersonating
      </button>
    </div>
  ) : null

  const childProps = { banner }

  if (!token || !account.username) return <AuthRequired {...childProps} />
  if (error) {
    if (error === 'accountInactive') return <AccountInactive {...childProps} />
    if (error === 'accountDisabled') return <AccountDisabled {...childProps} />
    if (error === 'accountBlocked') return <AccountProhibited {...childProps} />
    if (error === 'consentLacking') return <ConsentLacking {...childProps} refresh={refresh} />
    return <AccountStatusUnknown {...childProps} />
  }

  if (!roles.levels[account.role] || roles.levels[account.role] < roles.levels[requiredRole]) {
    return <RoleLacking {...childProps} role={account.role} requiredRole={requiredRole} />
  }

  return children
}

/**
 * A component to display different content to users or visitors.
 *
 * This is a convenience component to not have to check
 * for a user account is many different places.
 *
 * @component
 * @param {object} props - All component props
 * @param {JSX.Element} userContent - The content to show to users
 * @param {JSX.Element} visitorContent - The content to show to visitors (not-logged in)
 * @returns {JSX.Element}
 */
export const UserVisitorContent = ({ userContent = null, visitorContent = null }) => {
  const { account, setAccount, token } = useAccount()
  const backend = useBackend()

  const [ready, setReady] = useState(false)
  const [error, setError] = useState(false)

  /*
   * Avoid hydration errors
   */
  useEffect(() => {
    const verifyUser = async () => {
      const [status, data] = await backend.ping()
      if (status === 200 && data.result === 'success') {
        // Refresh account in local storage
        setAccount({
          ...account,
          ...data.account,
          bestBefore: Date.now() + 3600000,
        })
      } else {
        if (data?.error?.error) setError(data.error.error)
      }
      setReady(true)
    }
    if (token) {
      // Don't hammer the backend. Check once per hour.
      if (!account.bestBefore || account.bestBefore < Date.now()) verifyUser()
    }
    setReady(true)
  }, [])

  if (!ready) return <Spinner />
  if (error)
    return (
      <Popout type="error" title="Something went wrong" compact>
        This is unexpected. You may want to report this.
      </Popout>
    )

  return token && account.username ? userContent : visitorContent
}