import { Button } from '@/Components/Button/Button'
import { WebApplication } from '@/UIModels/Application'
import { AppState } from '@/UIModels/AppState'
import { PurchaseFlowPane } from '@/UIModels/AppState/PurchaseFlowState'
import { observer } from 'mobx-react-lite'
import { FunctionComponent } from 'preact'
import { useEffect, useRef, useState } from 'preact/hooks'
import { FloatingLabelInput } from '@/Components/Input/FloatingLabelInput'
import { isEmailValid } from '@/Utils'
import { loadPurchaseFlowUrl } from '@/Components/PurchaseFlow/PurchaseFlowWrapper'
import {
  BlueDotIcon,
  CircleIcon,
  DiamondIcon,
  CreateAccountIllustration,
} from '@standardnotes/stylekit'

type Props = {
  appState: AppState
  application: WebApplication
}

export const CreateAccount: FunctionComponent<Props> = observer(({ appState, application }) => {
  const { setCurrentPane } = appState.purchaseFlow
  const [email, setEmail] = useState('')
  const [password, setPassword] = useState('')
  const [confirmPassword, setConfirmPassword] = useState('')
  const [isCreatingAccount, setIsCreatingAccount] = useState(false)
  const [isEmailInvalid, setIsEmailInvalid] = useState(false)
  const [isPasswordNotMatching, setIsPasswordNotMatching] = useState(false)

  const emailInputRef = useRef<HTMLInputElement>(null)
  const passwordInputRef = useRef<HTMLInputElement>(null)
  const confirmPasswordInputRef = useRef<HTMLInputElement>(null)

  useEffect(() => {
    if (emailInputRef.current) {
      emailInputRef.current?.focus()
    }
  }, [])

  const handleEmailChange = (e: Event) => {
    if (e.target instanceof HTMLInputElement) {
      setEmail(e.target.value)
      setIsEmailInvalid(false)
    }
  }

  const handlePasswordChange = (e: Event) => {
    if (e.target instanceof HTMLInputElement) {
      setPassword(e.target.value)
    }
  }

  const handleConfirmPasswordChange = (e: Event) => {
    if (e.target instanceof HTMLInputElement) {
      setConfirmPassword(e.target.value)
      setIsPasswordNotMatching(false)
    }
  }

  const handleSignInInstead = () => {
    setCurrentPane(PurchaseFlowPane.SignIn)
  }

  const subscribeWithoutAccount = () => {
    loadPurchaseFlowUrl(application).catch((err) => {
      console.error(err)
      application.alertService.alert(err).catch(console.error)
    })
  }

  const handleCreateAccount = async () => {
    if (!email) {
      emailInputRef?.current?.focus()
      return
    }

    if (!isEmailValid(email)) {
      setIsEmailInvalid(true)
      emailInputRef?.current?.focus()
      return
    }

    if (!password) {
      passwordInputRef?.current?.focus()
      return
    }

    if (!confirmPassword) {
      confirmPasswordInputRef?.current?.focus()
      return
    }

    if (password !== confirmPassword) {
      setConfirmPassword('')
      setIsPasswordNotMatching(true)
      confirmPasswordInputRef?.current?.focus()
      return
    }

    setIsCreatingAccount(true)

    try {
      const response = await application.register(email, password)
      if (response.error || response.data?.error) {
        throw new Error(response.error?.message || response.data?.error?.message)
      } else {
        loadPurchaseFlowUrl(application).catch((err) => {
          console.error(err)
          application.alertService.alert(err).catch(console.error)
        })
      }
    } catch (err) {
      console.error(err)
      application.alertService.alert(err as string).catch(console.error)
    } finally {
      setIsCreatingAccount(false)
    }
  }

  return (
    <div className="flex items-center">
      <CircleIcon className="absolute w-8 h-8 top-40% -left-28" />
      <BlueDotIcon className="absolute w-4 h-4 top-35% -left-10" />
      <DiamondIcon className="absolute w-26 h-26 -bottom-5 left-0 -translate-x-1/2 -z-index-1" />

      <CircleIcon className="absolute w-8 h-8 bottom-35% -right-20" />
      <BlueDotIcon className="absolute w-4 h-4 bottom-25% -right-10" />
      <DiamondIcon className="absolute w-18 h-18 top-0 -right-2 translate-x-1/2 -z-index-1" />

      <div className="mr-12 md:mr-0">
        <h1 className="mt-0 mb-2 text-2xl">Create your free account</h1>
        <div className="mb-4 font-medium text-sm">to continue to Standard Notes.</div>
        <form onSubmit={handleCreateAccount}>
          <div className="flex flex-col">
            <FloatingLabelInput
              className={`min-w-90 xs:min-w-auto ${isEmailInvalid ? 'mb-2' : 'mb-4'}`}
              id="purchase-sign-in-email"
              type="email"
              label="Email"
              value={email}
              onChange={handleEmailChange}
              ref={emailInputRef}
              disabled={isCreatingAccount}
              isInvalid={isEmailInvalid}
            />
            {isEmailInvalid ? (
              <div className="color-dark-red mb-4">Please provide a valid email.</div>
            ) : null}
            <FloatingLabelInput
              className="min-w-90 xs:min-w-auto mb-4"
              id="purchase-create-account-password"
              type="password"
              label="Password"
              value={password}
              onChange={handlePasswordChange}
              ref={passwordInputRef}
              disabled={isCreatingAccount}
            />
            <FloatingLabelInput
              className={`min-w-90 xs:min-w-auto ${isPasswordNotMatching ? 'mb-2' : 'mb-4'}`}
              id="create-account-confirm"
              type="password"
              label="Repeat password"
              value={confirmPassword}
              onChange={handleConfirmPasswordChange}
              ref={confirmPasswordInputRef}
              disabled={isCreatingAccount}
              isInvalid={isPasswordNotMatching}
            />
            {isPasswordNotMatching ? (
              <div className="color-dark-red mb-4">Passwords don't match. Please try again.</div>
            ) : null}
          </div>
        </form>
        <div className="flex xs:flex-col-reverse xs:items-start items-center justify-between">
          <div className="flex flex-col">
            <button
              onClick={handleSignInInstead}
              disabled={isCreatingAccount}
              className="flex items-start p-0 mb-2 bg-default border-0 font-medium color-info cursor-pointer hover:underline"
            >
              Sign in instead
            </button>
            <button
              onClick={subscribeWithoutAccount}
              disabled={isCreatingAccount}
              className="flex items-start p-0 bg-default border-0 font-medium color-info cursor-pointer hover:underline"
            >
              Subscribe without account
            </button>
          </div>
          <Button
            className="py-2.5 xs:mb-4"
            variant="primary"
            label={isCreatingAccount ? 'Creating account...' : 'Create account'}
            onClick={handleCreateAccount}
            disabled={isCreatingAccount}
          />
        </div>
      </div>
      <CreateAccountIllustration className="md:hidden" />
    </div>
  )
})