// @flow
import React, { Component } from 'react';
import PropTypes from 'prop-types';

import { Button, FormModel } from 'components/ui/form';
import styles from 'components/profile/profileForm.scss';
import Stepper from 'components/ui/stepper';
import { SlideMotion } from 'components/ui/motion';
import { ScrollIntoView } from 'components/ui/scroll';
import logger from 'services/logger';
import { getSecret, enable as enableMFA } from 'services/api/mfa';

import Instructions from './instructions';
import KeyForm from './keyForm';
import Confirmation from './confirmation';
import messages from './MultiFactorAuth.intl.json';

import type { Form } from 'components/ui/form';

const STEPS_TOTAL = 3;

export type MfaStep = 0 | 1 | 2;
type Props = {
  onChangeStep: Function,
  confirmationForm: FormModel,
  onSubmit: (form: FormModel, sendData: () => Promise<*>) => Promise<*>,
  onComplete: Function,
  step: MfaStep,
};

interface State {
  isLoading: boolean;
  activeStep: MfaStep;
  secret: string;
  qrCodeSrc: string;
}

export default class MfaEnable extends Component<Props, State> {
  static defaultProps = {
    confirmationForm: new FormModel(),
    step: 0,
  };

  static contextTypes = {
    userId: PropTypes.number.isRequired,
  };

  state = {
    isLoading: false,
    activeStep: this.props.step,
    qrCodeSrc: '',
    secret: '',
  };

  confirmationFormEl: ?Form;

  componentWillMount() {
    this.syncState(this.props);
  }

  componentWillReceiveProps(nextProps: Props) {
    this.syncState(nextProps);
  }

  render() {
    const { activeStep, isLoading } = this.state;

    const stepsData = [
      {
        buttonLabel: messages.theAppIsInstalled,
        buttonAction: () => this.nextStep(),
      },
      {
        buttonLabel: messages.ready,
        buttonAction: () => this.nextStep(),
      },
      {
        buttonLabel: messages.enable,
        buttonAction: () =>
          this.confirmationFormEl && this.confirmationFormEl.submit(),
      },
    ];

    const { buttonLabel, buttonAction } = stepsData[activeStep];

    return (
      <div>
        <div className={styles.stepper}>
          <Stepper totalSteps={STEPS_TOTAL} activeStep={activeStep} />
        </div>

        <div className={styles.form}>
          {activeStep > 0 ? <ScrollIntoView /> : null}

          {this.renderStepForms()}

          <Button
            color="green"
            onClick={buttonAction}
            loading={isLoading}
            block
            label={buttonLabel}
          />
        </div>
      </div>
    );
  }

  renderStepForms() {
    const { activeStep, secret, qrCodeSrc } = this.state;

    return (
      <SlideMotion activeStep={activeStep}>
        {[
          <Instructions key="step1" />,
          <KeyForm key="step2" secret={secret} qrCodeSrc={qrCodeSrc} />,
          <Confirmation
            key="step3"
            form={this.props.confirmationForm}
            formRef={(el: Form) => (this.confirmationFormEl = el)}
            onSubmit={this.onTotpSubmit}
            onInvalid={() => this.forceUpdate()}
          />,
        ]}
      </SlideMotion>
    );
  }

  syncState(props: Props) {
    if (props.step === 1) {
      this.setState({ isLoading: true });

      getSecret(this.context.userId).then(resp => {
        this.setState({
          isLoading: false,
          secret: resp.secret,
          qrCodeSrc: resp.qr,
        });
      });
    }

    this.setState({
      activeStep:
        typeof props.step === 'number' ? props.step : this.state.activeStep,
    });
  }

  nextStep() {
    const nextStep = this.state.activeStep + 1;

    if (nextStep < STEPS_TOTAL) {
      this.props.onChangeStep(nextStep);
    }
  }

  onTotpSubmit = (form: FormModel): Promise<*> => {
    this.setState({ isLoading: true });

    return this.props
      .onSubmit(form, () => {
        const data = form.serialize();

        return enableMFA(this.context.userId, data.totp, data.password);
      })
      .then(() => this.props.onComplete())
      .catch(resp => {
        const { errors } = resp || {};

        if (errors) {
          return Promise.reject(errors);
        }

        logger.error('MFA: Unexpected form submit result', {
          resp,
        });
      })
      .finally(() => this.setState({ isLoading: false }));
  };
}