import template from '%/directives/password-wizard.pug';
import { PureCtrl } from '@Controllers';

const DEFAULT_CONTINUE_TITLE = "Continue";
const Steps = {
  PasswordStep: 1,
  FinishStep: 2
};

class PasswordWizardCtrl extends PureCtrl {
  /* @ngInject */
  constructor(
    $element,
    $timeout,
  ) {
    super($timeout);
    this.$element = $element;
    this.$timeout = $timeout;
    this.registerWindowUnloadStopper();
  }

  $onInit() {
    super.$onInit();
    this.initProps({
      type: this.type,
      changePassword: this.type === 'change-pw',
      securityUpdate: this.type === 'upgrade-security'
    });
    this.setState({
      formData: {},
      continueTitle: DEFAULT_CONTINUE_TITLE,
      step: Steps.PasswordStep,
      title: this.props.changePassword ? 'Change Password' : 'Account Update'
    });
  }

  $onDestroy() {
    super.$onDestroy();
    window.onbeforeunload = null;
  }

  /** Confirms with user before closing tab */
  registerWindowUnloadStopper() {
    window.onbeforeunload = (e) => {
      return true;
    };
  }

  resetContinueState() {
    this.setState({
      showSpinner: false,
      continueTitle: DEFAULT_CONTINUE_TITLE
    });
    this.isContinuing = false;
  }

  async nextStep() {
    if (this.state.lockContinue || this.isContinuing) {
      return;
    }
    if (this.state.step === Steps.FinishStep) {
      this.dismiss();
      return;
    }

    this.isContinuing = true;
    this.setState({
      showSpinner: true,
      continueTitle: "Generating Keys..."
    });
    const valid = await this.validateCurrentPassword();
    if (!valid) {
      this.resetContinueState();
      return;
    }
    const success = await this.processPasswordChange();
    if (!success) {
      this.resetContinueState();
      return;
    }
    this.isContinuing = false;
    this.setState({
      showSpinner: false,
      continueTitle: "Finish",
      step: Steps.FinishStep
    });
  }

  async setFormDataState(formData) {
    return this.setState({
      formData: {
        ...this.state.formData,
        ...formData
      }
    });
  }

  async validateCurrentPassword() {
    const currentPassword = this.state.formData.currentPassword;
    const newPass = this.props.securityUpdate ? currentPassword : this.state.formData.newPassword;
    if (!currentPassword || currentPassword.length === 0) {
      this.application.alertService.alert({
        text: "Please enter your current password."
      });
      return false;
    }
    if (this.props.changePassword) {
      if (!newPass || newPass.length === 0) {
        this.application.alertService.alert({
          text: "Please enter a new password."
        });
        return false;
      }
      if (newPass !== this.state.formData.newPasswordConfirmation) {
        this.application.alertService.alert({
          text: "Your new password does not match its confirmation."
        });
        this.state.formData.status = null;
        return false;
      }
    }
    if (!this.application.getUser().email) {
      this.application.alertService.alert({
        text: "We don't have your email stored. Please log out then log back in to fix this issue."
      });
      this.state.formData.status = null;
      return false;
    }

    /** Validate current password */
    const success = await this.application.validateAccountPassword({
      password: this.state.formData.currentPassword
    });
    if (!success) {
      this.application.alertService.alert({
        text: "The current password you entered is not correct. Please try again."
      });
    }
    return success;
  }

  async processPasswordChange() {
    this.setState({
      lockContinue: true,
      processing: true
    });
    this.setFormDataState({
      status: "Processing encryption keys..."
    });
    const newPassword = this.props.securityUpdate
      ? this.state.formData.currentPassword
      : this.state.formData.newPassword;
    const response = await this.application.changePassword({
      currentPassword: this.state.formData.currentPassword,
      newPassword: newPassword
    });
    const success = !response.error;
    this.setFormDataState({
      statusError: !success,
      processing: success
    });
    if (!success) {
      this.application.alertService.alert({
        text: response.error.message
          ? response.error.message
          : "There was an error changing your password. Please try again."
      });
      this.setFormDataState({
        status: "Unable to process your password. Please try again."
      });
    } else {
      this.setState({
        lockContinue: false,
        formData: {
          ...this.state.formData,
          status: this.props.changePassword
            ? "Successfully changed password."
            : "Successfully performed account update."
        }
      });
    }
    return success;
  }

  dismiss() {
    if (this.state.lockContinue) {
      this.application.alertService.alert({
        text: "Cannot close window until pending tasks are complete."
      });
    } else {
      const elem = this.$element;
      const scope = elem.scope();
      scope.$destroy();
      elem.remove();
    }
  }
}

export class PasswordWizard {
  constructor() {
    this.restrict = 'E';
    this.template = template;
    this.controller = PasswordWizardCtrl;
    this.controllerAs = 'ctrl';
    this.bindToController = true;
    this.scope = {
      type: '=',
      application: '='
    };
  }
}