import React, { useRef, useState } from "react";
import styled from "styled-components";
import { connect } from "react-redux";
import DetailsForm from "./DetailsForm";
import NewsletterForm from "./NewsletterForm";
import AppsmithLogo from "assets/images/appsmith_logo.png";
import {
  WELCOME_FORM_CUSTOM_USECASE_FIELD_NAME,
  WELCOME_FORM_EMAIL_FIELD_NAME,
  WELCOME_FORM_NAME,
  WELCOME_FORM_NAME_FIELD_NAME,
  WELCOME_FORM_PASSWORD_FIELD_NAME,
  WELCOME_FORM_ROLE_FIELD_NAME,
  WELCOME_FORM_ROLE_NAME_FIELD_NAME,
  WELCOME_FORM_USECASE_FIELD_NAME,
  WELCOME_FORM_VERIFY_PASSWORD_FIELD_NAME,
} from "@appsmith/constants/forms";
import {
  FormErrors,
  formValueSelector,
  getFormSyncErrors,
  InjectedFormProps,
  reduxForm,
} from "redux-form";
import { isEmail, isStrongPassword } from "utils/formhelpers";
import { AppState } from "@appsmith/reducers";
import { SUPER_USER_SUBMIT_PATH } from "@appsmith/constants/ApiConstants";

const PageWrapper = styled.div`
  width: 100%;
  display: flex;
  justify-content: center;
  height: 100vh;
  overflow: auto;
  position: relative;
  z-index: 100;
`;

const SetupFormContainer = styled.div`
  padding: 120px 42px 0px 0px;
`;

const SetupStep = styled.div<{ active: boolean }>`
  display: ${(props) => (props.active ? "block" : "none")};
`;

const LogoContainer = styled.div`
  padding-left: ${(props) => props.theme.spaces[17] * 2}px;
  padding-top: ${(props) => props.theme.spaces[12] * 2}px;
  transform: translate(-11px, 0);
  background-color: ${(props) => props.theme.colors.homepageBackground};
  position: fixed;
  width: 566px;
  height: 112px;
  z-index: 1;
  top: 0;
`;

const AppsmithLogoImg = styled.img`
  max-width: 170px;
`;

const SpaceFiller = styled.div`
  height: 100px;
`;

export type DetailsFormValues = {
  name?: string;
  email?: string;
  password?: string;
  verifyPassword?: string;
  role?: string;
  useCase?: string;
  custom_useCase?: string;
  role_name?: string;
};

const validate = (values: DetailsFormValues) => {
  const errors: DetailsFormValues = {};
  if (!values.name) {
    errors.name = "Please enter a valid Full Name";
  }

  if (!values.email || !isEmail(values.email)) {
    errors.email = "Please enter a valid Email address";
  }

  if (!values.password || !isStrongPassword(values.password)) {
    errors.password = "Please enter a strong password";
  }

  if (!values.verifyPassword || values.password != values.verifyPassword) {
    errors.verifyPassword = "Please reenter the password";
  }

  if (!values.role) {
    errors.role = "Please select a role";
  }

  if (values.role == "other" && !values.role_name) {
    errors.role_name = "Please enter a role";
  }

  if (!values.useCase) {
    errors.useCase = "Please select a use case";
  }

  if (values.useCase === "other" && !values.custom_useCase)
    errors.custom_useCase = "Please enter a use case";

  return errors;
};

export type SetupFormProps = DetailsFormValues & {
  formSyncErrors?: FormErrors<string, string>;
} & InjectedFormProps<
    DetailsFormValues,
    {
      formSyncErrors?: FormErrors<string, string>;
    }
  >;

function SetupForm(props: SetupFormProps) {
  const signupURL = `/api/v1/${SUPER_USER_SUBMIT_PATH}`;
  const [showDetailsForm, setShowDetailsForm] = useState(true);
  const formRef = useRef<HTMLFormElement>(null);
  const onSubmit = () => {
    const form: HTMLFormElement = formRef.current as HTMLFormElement;
    const verifyPassword: HTMLInputElement = document.querySelector(
      `[name="verifyPassword"]`,
    ) as HTMLInputElement;
    const roleInput = document.createElement("input");
    verifyPassword.removeAttribute("name");
    roleInput.type = "text";
    roleInput.name = "role";
    roleInput.style.display = "none";
    if (props.role !== "other") {
      roleInput.value = props.role as string;
    } else {
      roleInput.value = props.role_name as string;
      const roleNameInput: HTMLInputElement = document.querySelector(
        `[name="role_name"]`,
      ) as HTMLInputElement;
      if (roleNameInput) roleNameInput.remove();
    }
    form.appendChild(roleInput);
    const useCaseInput = document.createElement("input");
    useCaseInput.type = "text";
    useCaseInput.name = "useCase";
    useCaseInput.style.display = "none";
    if (props.useCase !== "other") {
      useCaseInput.value = props.useCase as string;
    } else {
      useCaseInput.value = props.custom_useCase as string;
      const customUseCaseInput: HTMLInputElement = document.querySelector(
        `[name="custom_useCase"]`,
      ) as HTMLInputElement;
      if (customUseCaseInput) customUseCaseInput.remove();
    }
    form.appendChild(useCaseInput);
    return true;
  };

  const onKeyDown = (event: React.KeyboardEvent<HTMLFormElement>) => {
    if (event.key === "Enter") {
      if (props.valid) {
        if (showDetailsForm) {
          // If we are on the details page we do not want to submit the form
          // instead we move the user to the next page
          event.preventDefault();
          onNext();
        }
      } else {
        // The fields to be marked as touched so that we can display the errors
        const toTouch = [];
        // We fetch the fields which are invalid
        for (const key in props.formSyncErrors) {
          props.formSyncErrors.hasOwnProperty(key) && toTouch.push(key);
        }
        props.touch(...toTouch);
        // prevent submitting the form on enter if the values are invalid
        event.preventDefault();
      }
    }
  };

  const onNext = () => {
    setShowDetailsForm(false);
  };

  return (
    <PageWrapper>
      <SetupFormContainer>
        <LogoContainer>
          <AppsmithLogoImg alt="Appsmith logo" src={AppsmithLogo} />
        </LogoContainer>
        <form
          action={signupURL}
          data-testid="super-user-form"
          id="super-user-form"
          method="POST"
          onKeyDown={onKeyDown}
          onSubmit={onSubmit}
          ref={formRef}
        >
          <SetupStep active={showDetailsForm}>
            <DetailsForm {...props} onNext={onNext} />
          </SetupStep>
          <SetupStep active={!showDetailsForm}>
            <NewsletterForm />
          </SetupStep>
        </form>
        <SpaceFiller />
      </SetupFormContainer>
    </PageWrapper>
  );
}

const selector = formValueSelector(WELCOME_FORM_NAME);
export default connect((state: AppState) => {
  return {
    name: selector(state, WELCOME_FORM_NAME_FIELD_NAME),
    email: selector(state, WELCOME_FORM_EMAIL_FIELD_NAME),
    password: selector(state, WELCOME_FORM_PASSWORD_FIELD_NAME),
    verify_password: selector(state, WELCOME_FORM_VERIFY_PASSWORD_FIELD_NAME),
    role: selector(state, WELCOME_FORM_ROLE_FIELD_NAME),
    role_name: selector(state, WELCOME_FORM_ROLE_NAME_FIELD_NAME),
    useCase: selector(state, WELCOME_FORM_USECASE_FIELD_NAME),
    custom_useCase: selector(state, WELCOME_FORM_CUSTOM_USECASE_FIELD_NAME),
    formSyncErrors: getFormSyncErrors(WELCOME_FORM_NAME)(state),
  };
}, null)(
  reduxForm<DetailsFormValues, { formSyncErrors?: FormErrors<string, string> }>(
    {
      validate,
      form: WELCOME_FORM_NAME,
      touchOnBlur: true,
    },
  )(SetupForm),
);