// Copyright 2025 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only

import type { MutableRefObject, ReactNode } from 'react';
import React, {
  useCallback,
  useEffect,
  useMemo,
  useRef,
  useState,
} from 'react';

import classNames from 'classnames';
import type { ReadonlyDeep } from 'type-fest';
import type { LocalizerType } from '../types/Util.std.ts';
import { useConfirmDiscard } from '../hooks/useConfirmDiscard.dom.tsx';
import {
  donationErrorTypeSchema,
  DonationProcessor,
  donationStateSchema,
  ONE_TIME_DONATION_CONFIG_ID,
  PaymentMethod,
} from '../types/Donations.std.ts';
import type {
  CardDetail,
  DonationErrorType,
  DonationStateType,
  HumanDonationAmount,
  DonationWorkflow,
  OneTimeDonationHumanAmounts,
} from '../types/Donations.std.ts';
import type {
  CardCvcError,
  CardExpirationError,
  CardNumberError,
} from '../types/DonationsCardForm.std.ts';
import {
  cardFormToCardDetail,
  getCardFormSettings,
  getPossibleCardFormats,
  parseCardCvc,
  parseCardExpiration,
  parseCardForm,
  parseCardNumber,
} from '../types/DonationsCardForm.std.ts';
import {
  brandHumanDonationAmount,
  brandStripeDonationAmount,
  type CurrencyFormatResult,
  getCurrencyFormat,
  getMaximumStripeAmount,
  parseCurrencyString,
  toHumanCurrencyString,
  toHumanDonationAmount,
  toStripeDonationAmount,
} from '../util/currency.dom.ts';
import { PreferencesContent } from './Preferences.dom.tsx';
import type { SubmitDonationType } from '../state/ducks/donations.preload.ts';
import { Select } from './Select.dom.tsx';
import {
  DonateInputCardNumber,
  getCardNumberErrorMessage,
} from './preferences/donations/DonateInputCardNumber.dom.tsx';
import {
  DonateInputCardExp,
  getCardExpirationErrorMessage,
} from './preferences/donations/DonateInputCardExp.dom.tsx';
import {
  DonateInputCardCvc,
  getCardCvcErrorMessage,
} from './preferences/donations/DonateInputCardCvc.dom.tsx';
import { I18n } from './I18n.dom.tsx';
import { strictAssert } from '../util/assert.std.ts';
import { DonationsOfflineTooltip } from './conversation/DonationsOfflineTooltip.dom.tsx';
import { DonateInputAmount } from './preferences/donations/DonateInputAmount.dom.tsx';
import { Tooltip, TooltipPlacement } from './Tooltip.dom.tsx';
import { offsetDistanceModifier } from '../util/popperUtil.std.ts';
import { AxoButton } from '../axo/AxoButton.dom.tsx';
import { missingCaseError } from '../util/missingCaseError.std.ts';
import { openLinkInWebBrowser } from '../util/openLinkInWebBrowser.dom.ts';
import { usePrevious } from '../hooks/usePrevious.std.ts';
import { tw } from '../axo/tw.dom.tsx';

const SUPPORT_URL = 'https://support.signal.org/hc/requests/new?desktop';

export type PropsDataType = {
  i18n: LocalizerType;
  initialCurrency: string;
  isOnline: boolean;
  donationAmountsConfig: ReadonlyDeep<OneTimeDonationHumanAmounts> | undefined;
  lastError: DonationErrorType | undefined;
  validCurrencies: ReadonlyArray<string>;
  workflow: DonationWorkflow | undefined;
  renderDonationHero: () => React.JSX.Element;
};

type PropsHousekeepingType = {
  contentsRef: MutableRefObject<HTMLDivElement | null>;
};

type PropsActionType = {
  clearWorkflow: () => void;
  showPrivacyModal: () => void;
  submitDonation: (payload: SubmitDonationType) => void;
  onBack: () => void;
};

export type PropsType = PropsDataType & PropsActionType & PropsHousekeepingType;

const isPaymentDetailFinalizedInWorkflow = (workflow: DonationWorkflow) => {
  const finalizedStates: Array<DonationStateType> = [
    donationStateSchema.enum.INTENT_CONFIRMED,
    donationStateSchema.enum.INTENT_REDIRECT,
    donationStateSchema.enum.PAYPAL_APPROVED,
    donationStateSchema.enum.PAYMENT_CONFIRMED,
    donationStateSchema.enum.RECEIPT,
    donationStateSchema.enum.DONE,
  ];
  return finalizedStates.includes(workflow.type);
};

export function PreferencesDonateFlow({
  contentsRef,
  i18n,
  initialCurrency,
  isOnline,
  donationAmountsConfig,
  lastError,
  validCurrencies,
  workflow,
  clearWorkflow,
  renderDonationHero,
  showPrivacyModal,
  submitDonation,
  onBack,
}: PropsType): React.JSX.Element {
  const tryClose = useRef<(() => void) | null>(null);

  // When returning to the donate flow with a pending PayPal payment, load the pending
  // amount in case the user wants to go back and choose a different payment processor.
  const { initialStep, initialAmount } = useMemo((): {
    initialStep: 'amount' | 'paypal';
    initialAmount: HumanDonationAmount | undefined;
  } => {
    if (
      workflow?.type === donationStateSchema.enum.PAYPAL_INTENT ||
      workflow?.type === donationStateSchema.enum.PAYPAL_APPROVED
    ) {
      const savedAmount = brandStripeDonationAmount(workflow.paymentAmount);
      const humanAmount = toHumanDonationAmount({
        amount: savedAmount,
        currency: workflow.currencyType,
      });
      return { initialStep: 'paypal', initialAmount: humanAmount };
    }

    return {
      initialStep: 'amount',
      initialAmount: undefined,
    };
    // oxlint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  const [step, setStep] = useState<
    'amount' | 'paymentProcessor' | 'stripePaymentDetails' | 'paypal'
  >(initialStep);

  const [amount, setAmount] = useState<HumanDonationAmount | undefined>(
    initialAmount
  );
  const [currency, setCurrency] = useState<string>(initialCurrency);
  const [isCardFormDisabled, setIsCardFormDisabled] = useState(false);
  const [cardFormValues, setCardFormValues] = useState<
    CardFormValues | undefined
  >();

  const prevStep = usePrevious(step, step);

  const hasCardFormData = useMemo(() => {
    if (!cardFormValues) {
      return false;
    }
    return (
      cardFormValues.cardNumber !== '' ||
      cardFormValues.cardExpiration !== '' ||
      cardFormValues.cardCvc !== ''
    );
  }, [cardFormValues]);

  // When changing currency, clear out the last selected amount
  const handleAmountPickerCurrencyChanged = useCallback((value: string) => {
    setAmount(undefined);
    setCurrency(value);
  }, []);

  const isPaymentProcessorStepEnabled = useMemo(() => {
    if (
      donationAmountsConfig == null ||
      donationAmountsConfig[currency] == null
    ) {
      return false;
    }

    return donationAmountsConfig[currency].supportedPaymentMethods.includes(
      PaymentMethod.Paypal
    );
  }, [donationAmountsConfig, currency]);

  const handleAmountPickerResult = useCallback(
    (result: AmountPickerResult) => {
      const { currency: pickedCurrency, amount: pickedAmount } = result;
      setAmount(pickedAmount);
      setCurrency(pickedCurrency);

      if (isPaymentProcessorStepEnabled) {
        setStep('paymentProcessor');
      } else {
        setStep('stripePaymentDetails');
      }
    },
    [isPaymentProcessorStepEnabled]
  );

  const handleCardFormChanged = useCallback((values: CardFormValues) => {
    setCardFormValues(values);
  }, []);

  const handleSubmitDonation = useCallback(
    ({
      processor,
      cardDetail,
    }: {
      processor: DonationProcessor;
      cardDetail?: CardDetail;
    }): boolean => {
      if (amount == null || currency == null) {
        return false;
      }

      const paymentAmount = toStripeDonationAmount({ amount, currency });

      if (processor === DonationProcessor.Stripe) {
        strictAssert(cardDetail, 'cardDetail is required for Stripe');
        submitDonation({
          currencyType: currency,
          paymentAmount,
          processor: DonationProcessor.Stripe,
          paymentDetail: cardDetail,
        });
      } else if (processor === DonationProcessor.Paypal) {
        submitDonation({
          currencyType: currency,
          paymentAmount,
          processor: DonationProcessor.Paypal,
        });
      } else {
        throw missingCaseError(processor);
      }

      return true;
    },
    [amount, currency, submitDonation]
  );

  const handleSubmitStripeDonation = useCallback(
    (cardDetail: CardDetail) => {
      if (
        handleSubmitDonation({
          processor: DonationProcessor.Stripe,
          cardDetail,
        })
      ) {
        setIsCardFormDisabled(true);
      }
    },
    [handleSubmitDonation]
  );

  const handleSubmitPaypalDonation = useCallback(() => {
    handleSubmitDonation({ processor: DonationProcessor.Paypal });
    // An effect will transition step to paypal after chat server confirmation
  }, [handleSubmitDonation]);

  const handleBackFromCardForm = useCallback(() => {
    if (isPaymentProcessorStepEnabled) {
      setStep('paymentProcessor');
    } else {
      setStep('amount');
    }
  }, [isPaymentProcessorStepEnabled]);

  useEffect(() => {
    if (!workflow || lastError) {
      setIsCardFormDisabled(false);
    }
  }, [lastError, setIsCardFormDisabled, workflow]);

  useEffect(() => {
    // When starting a Paypal payment, we create a workflow in the PAYPAL_INTENT state
    // which contains the approvalUrl.
    if (
      prevStep === 'paymentProcessor' &&
      workflow?.type === donationStateSchema.enum.PAYPAL_INTENT
    ) {
      setStep('paypal');
      openLinkInWebBrowser(workflow.approvalUrl);
    }
  }, [prevStep, workflow]);

  const discardModalBodyText = useMemo(() => {
    if (step === 'stripePaymentDetails') {
      return i18n('icu:DonateFlow__discard-dialog-body');
    }

    if (step === 'paypal') {
      return i18n('icu:DonateFlow__discard-paypal-dialog-body');
    }

    return undefined;
  }, [i18n, step]);

  const discardModalCancelText = useMemo(() => {
    if (step === 'paypal') {
      return i18n('icu:DonateFlow__discard-paypal-dialog-cancel');
    }

    // Use default text "Cancel"
    return undefined;
  }, [i18n, step]);

  const discardModalDiscardText = useMemo(() => {
    if (step === 'stripePaymentDetails') {
      return i18n('icu:DonateFlow__discard-dialog-remove-info');
    }

    if (step === 'paypal') {
      return i18n('icu:DonateFlow__discard-paypal-dialog-discard');
    }

    return undefined;
  }, [i18n, step]);

  const [confirmDiscardModal, confirmDiscardIf] = useConfirmDiscard({
    i18n,
    bodyText: discardModalBodyText,
    cancelText: discardModalCancelText,
    discardText: discardModalDiscardText,
    name: 'PreferencesDonateFlow',
    tryClose,
  });

  const onTryClose = useCallback(() => {
    const onDiscard = () => {
      // Don't clear the workflow if we're processing the payment and
      // payment information is finalized.
      if (!workflow || !isPaymentDetailFinalizedInWorkflow(workflow)) {
        clearWorkflow();
      }
    };
    const isConfirmationNeeded =
      ((hasCardFormData && !isCardFormDisabled) ||
        (step === 'paypal' &&
          lastError !== donationErrorTypeSchema.enum.PaypalCanceled)) &&
      (!workflow || !isPaymentDetailFinalizedInWorkflow(workflow));

    confirmDiscardIf(isConfirmationNeeded, onDiscard);
  }, [
    clearWorkflow,
    confirmDiscardIf,
    hasCardFormData,
    isCardFormDisabled,
    lastError,
    step,
    workflow,
  ]);
  tryClose.current = onTryClose;

  let innerContent: React.JSX.Element;
  let handleBack: () => void;

  if (step === 'amount') {
    innerContent = (
      <>
        {renderDonationHero()}
        <AmountPicker
          i18n={i18n}
          initialAmount={amount}
          initialCurrency={currency}
          isOnline={isOnline}
          donationAmountsConfig={donationAmountsConfig}
          validCurrencies={validCurrencies}
          onChangeCurrency={handleAmountPickerCurrencyChanged}
          onSubmit={handleAmountPickerResult}
        />
        <HelpFooter i18n={i18n} showOneTimeOnlyNotice />
      </>
    );
    // Dismiss DonateFlow and return to Donations home
    handleBack = () => onBack();
  } else if (step === 'paymentProcessor') {
    strictAssert(amount, 'Amount is required for payment processor form');
    innerContent = (
      <>
        <CardFormHero i18n={i18n} amount={amount} currency={currency} />
        <button
          className={tw(
            'flex',
            'bg-color-fill-primary pressed:bg-color-fill-primary-pressed',
            'rounded-md',
            'justify-center type-body-medium text-label-primary-on-color',
            'mt-6 mb-3 h-[36px] w-[280px] py-2'
          )}
          onClick={() => setStep('stripePaymentDetails')}
          type="button"
        >
          <span
            className="PreferencesDonations__payment-icon"
            aria-label={i18n(
              'icu:DonateFlow__PaymentCardIcon__AccessibilityLabel'
            )}
          />
          <span
            className={tw(
              'ms-3 flex type-body-medium text-label-primary-on-color'
            )}
          >
            {i18n('icu:DonateFlow__CreditOrDebitCard')}
          </span>
        </button>
        <button
          className="PreferencesDonations__paypal-button"
          onClick={handleSubmitPaypalDonation}
          type="button"
        >
          <img
            src="images/paypal.svg"
            aria-label={i18n('icu:DonateFlow__Paypal__AccessibilityLabel')}
            draggable={false}
          />
        </button>
      </>
    );
    handleBack = () => {
      setStep('amount');
    };
  } else if (step === 'stripePaymentDetails') {
    strictAssert(amount, 'Amount is required for payment card form');
    innerContent = (
      <>
        <CardFormHero i18n={i18n} amount={amount} currency={currency} />
        <hr className="PreferencesDonations__separator PreferencesDonations__separator--card-form" />
        <CardForm
          amount={amount}
          currency={currency}
          disabled={isCardFormDisabled}
          i18n={i18n}
          initialValues={cardFormValues}
          isOnline={isOnline}
          onChange={handleCardFormChanged}
          onSubmit={handleSubmitStripeDonation}
          showPrivacyModal={showPrivacyModal}
        />
        <HelpFooter i18n={i18n} />
      </>
    );
    handleBack = handleBackFromCardForm;
  } else if (step === 'paypal') {
    strictAssert(amount, 'Amount is required for Paypal page');
    const isDisabled =
      workflow?.type !== donationStateSchema.enum.PAYPAL_INTENT;
    innerContent = (
      <>
        <CardFormHero i18n={i18n} amount={amount} currency={currency} />
        <hr className="PreferencesDonations__separator PreferencesDonations__separator--card-form" />
        <div className={tw('my-4 flex min-w-[400px] py-4 type-body-large')}>
          <div className={tw('flex grow items-center')}>
            {i18n('icu:Donations__PaymentMethod')}
          </div>
          <img
            className={tw('flex')}
            src="images/paypal.svg"
            aria-label={i18n('icu:DonateFlow__Paypal__AccessibilityLabel')}
            draggable={false}
          />
        </div>
        <div
          className={tw('flex min-w-[400px] justify-end gap-3 type-body-large')}
        >
          <AxoButton.Root
            variant="secondary"
            size="lg"
            disabled={isDisabled}
            onClick={onBack}
          >
            {i18n('icu:DonateFlow__Paypal__Cancel')}
          </AxoButton.Root>
          <AxoButton.Root
            variant="primary"
            size="lg"
            disabled={isDisabled}
            onClick={() => {
              if (workflow?.type === donationStateSchema.enum.PAYPAL_INTENT) {
                openLinkInWebBrowser(workflow.approvalUrl);
              }
            }}
          >
            {i18n('icu:DonateFlow__Paypal__CompleteDonation')}
          </AxoButton.Root>
        </div>
      </>
    );
    handleBack = () => {
      clearWorkflow();
      setStep('amount');
      setIsCardFormDisabled(false);
    };
  } else {
    throw missingCaseError(step);
  }

  const backButton = (
    <button
      aria-label={i18n('icu:goBack')}
      className="Preferences__back-icon"
      onClick={handleBack}
      type="button"
    />
  );
  const content = (
    <div className="PreferencesDonations DonationForm">
      {confirmDiscardModal}
      {innerContent}
    </div>
  );

  return (
    <PreferencesContent
      backButton={backButton}
      contents={content}
      contentsRef={contentsRef}
      title={undefined}
    />
  );
}

type AmountPickerResult = {
  amount: HumanDonationAmount;
  currency: string;
};

type AmountPickerProps = {
  i18n: LocalizerType;
  initialAmount: HumanDonationAmount | undefined;
  initialCurrency: string | undefined;
  isOnline: boolean;
  donationAmountsConfig: ReadonlyDeep<OneTimeDonationHumanAmounts> | undefined;
  validCurrencies: ReadonlyArray<string>;
  onChangeCurrency: (value: string) => void;
  onSubmit: (result: AmountPickerResult) => void;
};

function AmountPicker({
  donationAmountsConfig,
  i18n,
  initialAmount,
  initialCurrency = 'usd',
  isOnline,
  validCurrencies,
  onChangeCurrency,
  onSubmit,
}: AmountPickerProps): React.JSX.Element {
  const [currency, setCurrency] = useState(initialCurrency);

  const [presetAmount, setPresetAmount] = useState<
    HumanDonationAmount | undefined
  >();

  // Use localized group and decimal separators, but no symbol
  // Symbol will be added by DonateInputAmount
  const [customAmount, setCustomAmount] = useState<string>(
    toHumanCurrencyString({
      amount: initialAmount,
      currency,
      symbol: 'none',
    })
  );

  const [isCustomAmountErrorVisible, setIsCustomAmountErrorVisible] =
    useState<boolean>(false);

  // Reset amount selections when API donation config or selected currency changes
  // Memo here so preset options instantly load when component mounts.
  const presetAmountOptions = useMemo(() => {
    if (!donationAmountsConfig || !donationAmountsConfig[currency]) {
      return [];
    }

    const currencyAmounts = donationAmountsConfig[currency];
    const presets = currencyAmounts.oneTime[ONE_TIME_DONATION_CONFIG_ID] ?? [];
    return presets;
  }, [donationAmountsConfig, currency]);

  useEffect(() => {
    if (
      initialAmount &&
      presetAmountOptions.find(option => option === initialAmount)
    ) {
      setPresetAmount(initialAmount);
      setCustomAmount('');
    } else {
      setPresetAmount(undefined);
    }
  }, [initialAmount, presetAmountOptions]);

  const minimumAmount = useMemo<HumanDonationAmount>(() => {
    if (!donationAmountsConfig || !donationAmountsConfig[currency]) {
      return brandHumanDonationAmount(0);
    }

    const currencyAmounts = donationAmountsConfig[currency];
    return currencyAmounts.minimum;
  }, [donationAmountsConfig, currency]);

  const formattedMinimumAmount = useMemo<string>(() => {
    return toHumanCurrencyString({ amount: minimumAmount, currency });
  }, [minimumAmount, currency]);

  const maximumAmount = useMemo<HumanDonationAmount>(() => {
    return getMaximumStripeAmount(currency);
  }, [currency]);

  const formattedMaximumAmount = useMemo<string>(() => {
    return toHumanCurrencyString({ amount: maximumAmount, currency });
  }, [maximumAmount, currency]);

  const currencyOptionsForSelect = useMemo(() => {
    return validCurrencies.toSorted().map((currencyString: string) => {
      return { text: currencyString.toUpperCase(), value: currencyString };
    });
  }, [validCurrencies]);

  const currencyFormat = useMemo<CurrencyFormatResult | undefined>(
    () => getCurrencyFormat(currency),
    [currency]
  );

  const { error, parsedCustomAmount } = useMemo<{
    error:
      | 'invalid'
      | 'amount-below-minimum'
      | 'amount-above-maximum'
      | undefined;
    parsedCustomAmount: HumanDonationAmount | undefined;
  }>(() => {
    if (
      customAmount === '' ||
      customAmount == null ||
      (currencyFormat?.symbol && customAmount === currencyFormat?.symbol)
    ) {
      return {
        error: undefined,
        parsedCustomAmount: undefined,
      };
    }

    const parseResult = parseCurrencyString({
      currency,
      value: customAmount,
    });

    if (parseResult != null) {
      if (parseResult > maximumAmount) {
        return {
          error: 'amount-above-maximum',
          parsedCustomAmount: undefined,
        };
      }

      if (parseResult >= minimumAmount) {
        // Valid input
        return {
          error: undefined,
          parsedCustomAmount: parseResult,
        };
      }

      return {
        error: 'amount-below-minimum',
        parsedCustomAmount: undefined,
      };
    }

    return {
      error: 'invalid',
      parsedCustomAmount: undefined,
    };
  }, [currency, currencyFormat, customAmount, minimumAmount, maximumAmount]);

  const handleCurrencyChanged = useCallback(
    (value: string) => {
      setCurrency(value);
      setCustomAmount('');
      onChangeCurrency(value);
    },
    [onChangeCurrency]
  );

  const handleCustomAmountFocus = useCallback(() => {
    setPresetAmount(undefined);
  }, []);

  const handleCustomAmountBlur = useCallback(() => {
    // Only show parse errors on blur to avoid interrupting entry.
    // For example if you enter $1000 then it shouldn't show an error after '$1'.
    if (error) {
      setIsCustomAmountErrorVisible(true);
    }
  }, [error]);

  const handleCustomAmountChanged = useCallback((value: string) => {
    // Custom amount overrides any selected preset amount
    setPresetAmount(undefined);
    setCustomAmount(value);
  }, []);

  const amount = parsedCustomAmount ?? presetAmount;
  const isContinueEnabled = isOnline && currency != null && amount != null;

  const handleContinueClicked = useCallback(() => {
    if (!isContinueEnabled) {
      return;
    }

    onSubmit({ amount, currency });
  }, [amount, currency, isContinueEnabled, onSubmit]);

  useEffect(() => {
    // While entering custom amount, clear error as soon as we see a valid value.
    if (error == null) {
      setIsCustomAmountErrorVisible(false);
    }
  }, [error]);

  let customInputClassName;
  if (error && isCustomAmountErrorVisible) {
    customInputClassName = 'DonationAmountPicker__CustomInput--with-error';
  } else if (parsedCustomAmount) {
    customInputClassName = 'DonationAmountPicker__CustomInput--selected';
  } else {
    customInputClassName = 'DonationAmountPicker__CustomInput';
  }

  let customInputError: React.JSX.Element | undefined;
  if (isCustomAmountErrorVisible) {
    if (error === 'amount-below-minimum') {
      customInputError = (
        <div className="DonationAmountPicker__CustomAmountError">
          {i18n('icu:DonateFlow__custom-amount-below-minimum-error', {
            formattedCurrencyAmount: formattedMinimumAmount,
          })}
        </div>
      );
    } else if (error === 'amount-above-maximum') {
      customInputError = (
        <div className="DonationAmountPicker__CustomAmountError">
          {i18n('icu:DonateFlow__custom-amount-above-maximum-error', {
            formattedCurrencyAmount: formattedMaximumAmount,
          })}
        </div>
      );
    }
  }

  const continueButton = (
    <AxoButton.Root
      variant={isOnline ? 'primary' : 'secondary'}
      size="lg"
      disabled={!isContinueEnabled}
      onClick={handleContinueClicked}
    >
      {i18n('icu:DonateFlow__continue')}
    </AxoButton.Root>
  );

  let continueButtonWithTooltip: React.JSX.Element | undefined;
  if (!isOnline) {
    continueButtonWithTooltip = (
      <DonationsOfflineTooltip i18n={i18n}>
        {continueButton}
      </DonationsOfflineTooltip>
    );
  } else if (error === 'amount-below-minimum') {
    continueButtonWithTooltip = (
      <Tooltip
        className="InAnotherCallTooltip"
        content={i18n('icu:DonateFlow__custom-amount-below-minimum-tooltip', {
          formattedCurrencyAmount: formattedMinimumAmount,
        })}
        direction={TooltipPlacement.Top}
        popperModifiers={[offsetDistanceModifier(20)]}
      >
        {continueButton}
      </Tooltip>
    );
  }

  return (
    <div className="DonationAmountPicker">
      <Select
        moduleClassName="DonationForm__CurrencySelect"
        id="currency"
        options={currencyOptionsForSelect}
        onChange={handleCurrencyChanged}
        value={currency}
      />
      <div className="PreferencesDonations__section-header PreferencesDonations__section-header--donate-flow">
        {i18n('icu:DonateFlow__make-a-one-time-donation')}
      </div>
      <div className="DonationAmountPicker__AmountOptions">
        {presetAmountOptions.map(value => (
          <button
            className={classNames({
              DonationAmountPicker__PresetButton: true,
              'DonationAmountPicker__PresetButton--selected':
                presetAmount === value,
            })}
            key={value}
            onClick={() => {
              setCustomAmount('');
              setPresetAmount(value);
            }}
            type="button"
          >
            {toHumanCurrencyString({
              amount: value,
              currency,
              symbol: 'narrowSymbol',
            })}
          </button>
        ))}
        <DonateInputAmount
          className={customInputClassName}
          currency={currency}
          id="customAmount"
          onValueChange={handleCustomAmountChanged}
          onFocus={handleCustomAmountFocus}
          onBlur={handleCustomAmountBlur}
          placeholder={i18n(
            'icu:DonateFlow__amount-picker-custom-amount-placeholder'
          )}
          value={customAmount}
        />
        {customInputError}
      </div>
      <div className="DonationAmountPicker__PrimaryButtonContainer">
        {continueButtonWithTooltip ?? continueButton}
      </div>
    </div>
  );
}

type CardFormValues = {
  cardExpiration: string | undefined;
  cardNumber: string | undefined;
  cardCvc: string | undefined;
};

type CardFormProps = {
  amount: HumanDonationAmount;
  currency: string;
  disabled: boolean;
  i18n: LocalizerType;
  initialValues: CardFormValues | undefined;
  isOnline: boolean;
  onChange: (values: CardFormValues) => void;
  onSubmit: (cardDetail: CardDetail) => void;
  showPrivacyModal: () => void;
};

function CardForm({
  amount,
  currency,
  disabled,
  i18n,
  initialValues,
  isOnline,
  onChange,
  onSubmit,
  showPrivacyModal,
}: CardFormProps): React.JSX.Element {
  const [cardExpiration, setCardExpiration] = useState(
    initialValues?.cardExpiration ?? ''
  );
  const [cardNumber, setCardNumber] = useState(initialValues?.cardNumber ?? '');
  const [cardCvc, setCardCvc] = useState(initialValues?.cardCvc ?? '');

  const [cardNumberError, setCardNumberError] =
    useState<CardNumberError | null>(null);
  const [cardExpirationError, setCardExpirationError] =
    useState<CardExpirationError | null>(null);
  const [cardCvcError, setCardCvcError] = useState<CardCvcError | null>(null);

  const possibleCardFormats = useMemo(() => {
    return getPossibleCardFormats(cardNumber);
  }, [cardNumber]);
  const cardFormSettings = useMemo(() => {
    return getCardFormSettings(possibleCardFormats);
  }, [possibleCardFormats]);

  useEffect(() => {
    onChange({ cardExpiration, cardNumber, cardCvc });
  }, [cardExpiration, cardNumber, cardCvc, onChange]);

  const privacyLearnMoreLink = useCallback(
    (parts: ReactNode): React.JSX.Element => {
      return (
        <button
          type="button"
          className="PreferencesDonations__description__read-more"
          onClick={showPrivacyModal}
        >
          {parts}
        </button>
      );
    },
    [showPrivacyModal]
  );

  const handleCardNumberChange = useCallback((value: string) => {
    setCardNumber(value);
    setCardNumberError(null);
  }, []);

  const handleCardNumberBlur = useCallback(() => {
    if (cardNumber !== '') {
      const result = parseCardNumber(cardNumber);
      setCardNumberError(result.error ?? null);
    }
  }, [cardNumber]);

  const handleCardExpirationChange = useCallback((value: string) => {
    setCardExpiration(value);
    setCardExpirationError(null);
  }, []);

  const handleCardExpirationBlur = useCallback(() => {
    if (cardExpiration !== '') {
      const result = parseCardExpiration(cardExpiration);
      setCardExpirationError(result.error ?? null);
    }
  }, [cardExpiration]);

  const handleCardCvcChange = useCallback((value: string) => {
    setCardCvc(value);
    setCardCvcError(null);
  }, []);

  const handleCardCvcBlur = useCallback(() => {
    if (cardCvc !== '') {
      const result = parseCardCvc(cardCvc, possibleCardFormats);
      setCardCvcError(result.error ?? null);
    }
  }, [cardCvc, possibleCardFormats]);

  const formattedCurrencyAmount = useMemo<string>(() => {
    return toHumanCurrencyString({ amount, currency });
  }, [amount, currency]);

  const handleDonateClicked = useCallback(() => {
    const formResult = parseCardForm({ cardNumber, cardExpiration, cardCvc });

    setCardNumberError(formResult.cardNumber.error ?? null);
    setCardExpirationError(formResult.cardExpiration.error ?? null);
    setCardCvcError(formResult.cardCvc.error ?? null);

    const cardDetail = cardFormToCardDetail(formResult);
    if (
      cardDetail == null ||
      formResult.cardNumber.error ||
      formResult.cardExpiration.error ||
      formResult.cardCvc.error
    ) {
      return;
    }

    onSubmit(cardDetail);
  }, [cardCvc, cardExpiration, cardNumber, onSubmit]);

  const isDonateDisabled = useMemo(
    () =>
      disabled ||
      !isOnline ||
      cardNumber === '' ||
      cardExpiration === '' ||
      cardCvc === '' ||
      cardNumberError != null ||
      cardExpirationError != null ||
      cardCvcError != null,
    [
      cardCvc,
      cardCvcError,
      cardExpiration,
      cardExpirationError,
      cardNumber,
      cardNumberError,
      disabled,
      isOnline,
    ]
  );

  const handleInputEnterKey = useCallback(() => {
    if (!isDonateDisabled) {
      handleDonateClicked();
    }
  }, [handleDonateClicked, isDonateDisabled]);

  const donateButton = (
    <AxoButton.Root
      disabled={isDonateDisabled}
      onClick={handleDonateClicked}
      variant={isOnline ? 'primary' : 'secondary'}
      size="lg"
    >
      {i18n('icu:PreferencesDonations__donate-button-with-amount', {
        formattedCurrencyAmount,
      })}
    </AxoButton.Root>
  );

  return (
    <div className="DonationCardForm">
      <div className="DonationCardForm__Header--Info PreferencesDonations__section-header">
        {i18n('icu:DonateFlow__credit-or-debit-card')}
      </div>
      <div className="DonationCardForm__Info">
        <I18n
          components={{
            learnMoreLink: privacyLearnMoreLink,
          }}
          i18n={i18n}
          id="icu:DonateFlow__card-form-instructions"
        />
      </div>
      <div className="DonationCardForm_Field DonationCardForm_CardNumberField">
        <label className="DonationCardForm_Label" htmlFor="cardNumber">
          {i18n('icu:DonateFlow__card-form-card-number')}
        </label>
        <div
          className={classNames({
            'DonationCardForm_InputContainer--with-error':
              cardNumberError != null,
          })}
        >
          <DonateInputCardNumber
            id="cardNumber"
            value={cardNumber}
            onValueChange={handleCardNumberChange}
            maxInputLength={cardFormSettings.cardNumber.maxInputLength}
            onBlur={handleCardNumberBlur}
            onEnter={handleInputEnterKey}
          />
          {cardNumberError != null && (
            <div className="DonationCardForm_FieldError">
              {getCardNumberErrorMessage(i18n, cardNumberError)}
            </div>
          )}
        </div>
      </div>
      <div className="DonationCardForm_Field DonationCardForm_CardExpirationField">
        <label className="DonationCardForm_Label" htmlFor="cardExpiration">
          {i18n('icu:DonateFlow__card-form-expiration-date')}
        </label>
        <div
          className={classNames({
            'DonationCardForm_InputContainer--with-error':
              cardExpirationError != null,
          })}
        >
          <DonateInputCardExp
            i18n={i18n}
            id="cardExpiration"
            value={cardExpiration}
            onValueChange={handleCardExpirationChange}
            onBlur={handleCardExpirationBlur}
            onEnter={handleInputEnterKey}
          />
          {cardExpirationError && (
            <div className="DonationCardForm_FieldError">
              {getCardExpirationErrorMessage(i18n, cardExpirationError)}
            </div>
          )}
        </div>
      </div>
      <div className="DonationCardForm_Field DonationCardForm_CardCvcField">
        <label className="DonationCardForm_Label" htmlFor="cardCvc">
          {cardFormSettings.cardCvc.label}
        </label>
        <div
          className={classNames({
            'DonationCardForm_InputContainer--with-error': cardCvcError != null,
          })}
        >
          <DonateInputCardCvc
            id="cardCvc"
            value={cardCvc}
            onValueChange={handleCardCvcChange}
            maxInputLength={cardFormSettings.cardCvc.maxInputLength}
            onBlur={handleCardCvcBlur}
            onEnter={handleInputEnterKey}
          />
          {cardCvcError && (
            <div className="DonationCardForm_FieldError">
              {getCardCvcErrorMessage(i18n, cardCvcError)}
            </div>
          )}
        </div>
      </div>
      <div className="DonationCardForm__PrimaryButtonContainer">
        {isOnline ? (
          donateButton
        ) : (
          <DonationsOfflineTooltip i18n={i18n}>
            {donateButton}
          </DonationsOfflineTooltip>
        )}
      </div>
    </div>
  );
}

type CardFormHeroProps = {
  amount: HumanDonationAmount;
  currency: string;
  i18n: LocalizerType;
};

// Similar to <DonationHero> or renderDonationHero
function CardFormHero({
  amount,
  currency,
  i18n,
}: CardFormHeroProps): React.JSX.Element {
  const formattedCurrencyAmount = useMemo<string>(() => {
    return toHumanCurrencyString({ amount, currency });
  }, [amount, currency]);

  return (
    <>
      <div className="PreferencesDonations__avatar">
        <div className="DonationCardFormHero__Badge" />
      </div>
      <div className="PreferencesDonations__title">
        {i18n('icu:DonateFlow__card-form-title-donate-with-amount', {
          formattedCurrencyAmount,
        })}
      </div>
      <div className="PreferencesDonations__description">
        {i18n('icu:DonateFlow__one-time-donation-boost-badge-info')}
      </div>
    </>
  );
}

type HelpFooterProps = {
  i18n: LocalizerType;
  showOneTimeOnlyNotice?: boolean;
};

function HelpFooter({
  i18n,
  showOneTimeOnlyNotice,
}: HelpFooterProps): React.JSX.Element {
  const contactSupportLink = (parts: Array<string | React.JSX.Element>) => (
    <a
      className="DonationFormHelpFooter__ContactSupportLink"
      href={SUPPORT_URL}
      rel="noreferrer"
      target="_blank"
    >
      {parts}
    </a>
  );

  return (
    <div className="DonationForm__HelpFooter">
      {showOneTimeOnlyNotice && (
        <div className="DonationForm__HelpFooterDesktopOneTimeOnlyNotice">
          {i18n('icu:DonateFlow__desktop-one-time-only-notice')}
        </div>
      )}
      <I18n
        id="icu:DonateFlow__having-issues-contact-support"
        i18n={i18n}
        components={{
          contactSupportLink,
        }}
      />
    </div>
  );
}
