import { useState, useCallback, useRef } from 'react';

import { contactApi, UpdateContactNamesRequest } from '../../api/contactApi';
import { tokenService } from '../../services/TokenService';

const useViewContactWizard = () => {
  const [state, setState] = useState({
    step: 'select',
    selectedContact: null,
    contactDetails: null,
    isSubmitting: false,
    submissionError: null,
  });

  const abortControllerRef = useRef(null);

  const canProceedToNextStep = useCallback(() => {
    switch (state.step) {
      case 'select':
        return state.selectedContact != null;
      case 'modify':
        if (!state.contactDetails) return false;
        if (
          !state.contactDetails.first_name ||
          state.contactDetails.first_name.trim() === ''
        ) {
          return false;
        } else if (
          !state.contactDetails.last_name ||
          state.contactDetails.last_name.trim() === ''
        ) {
          return false;
        } else {
          return true;
        }
      // Nickname is optional, so we don't validate it
      case 'confirm':
        return true;
      default:
        return false;
    }
  }, [state.step, state.selectedContact, state.contactDetails]);

  const canGoBack = state.step !== 'select';

  const setContactDetails = (newDetails) => {
    console.log('Setting contact details:', newDetails);
    setState((prev) => ({
      ...prev,
      contactDetails: { ...prev.contactDetails, ...newDetails },
    }));
  };

  const onSelectedContact = (contact) => {
    const contactId = contact.id;

    setState((prev) => ({
      ...prev,
      selectedContact:
        prev.selectedContact?.id === contactId
          ? null
          : {
              id: contactId,
              first_name: contact.first_name,
              last_name: contact.last_name,
              phone_number: contact.phone_number,
              user_id: contact.user_id,
              nickname: contact.nickname || '',
            },
    }));
  };

  const nextStep = () => {
    if (!canProceedToNextStep()) return;

    const stepOrder = ['select', 'modify', 'confirm', 'result'];
    const currentIndex = stepOrder.indexOf(state.step);

    if (currentIndex < stepOrder.length - 1) {
      const nextStepValue = stepOrder[currentIndex + 1];

      // When moving from select to modify, initialize contactDetails with selected contact
      if (
        state.step === 'select' &&
        nextStepValue === 'modify' &&
        state.selectedContact
      ) {
        setState((prev) => ({
          ...prev,
          step: nextStepValue,
          submissionError: null,
          contactDetails: {
            first_name: prev.selectedContact.first_name || '',
            last_name: prev.selectedContact.last_name || '',
            nickname: prev.selectedContact.nickname || '',
            phone_number: prev.selectedContact.phone_number || '',
            id: prev.selectedContact.id,
            user_id: prev.selectedContact.user_id,
          },
        }));
        return;
      }

      setState((prev) => ({
        ...prev,
        step: nextStepValue,
        submissionError: null,
      }));
    }
  };

  const prevStep = () => {
    const stepOrder = ['select', 'modify', 'confirm', 'result'];
    const currentIndex = stepOrder.indexOf(state.step);
    if (currentIndex > 0) {
      setState((prev) => ({
        ...prev,
        step: stepOrder[currentIndex - 1],
        submissionError: null,
      }));
    }
  };

  const submit = async () => {
    if (state.isSubmitting) return;

    abortControllerRef.current = new AbortController();

    setState((prev) => ({
      ...prev,
      isSubmitting: true,
      submissionError: null,
    }));

    try {
      console.log('Updating contact');

      const userId = tokenService.getUserId();
      console.log('Contact details to update: ', state.contactDetails);

      let reqBody = new UpdateContactNamesRequest();
      reqBody.first_name = state.contactDetails.first_name;
      reqBody.last_name = state.contactDetails.last_name;
      reqBody.nickname = state.contactDetails.nickname || ''; // Send empty string if no nickname
      reqBody.contact_id = state.selectedContact.id;
      reqBody.user_id = userId;

      const response = await contactApi.updateContactNames(
        reqBody,
        tokenService.bearerToken()
      );

      if (response) {
        setState((prev) => ({
          ...prev,
          step: 'result',
          isSubmitting: false,
        }));
      } else {
        throw new Error('Failed to update contact');
      }
    } catch (error) {
      if (error.name === 'AbortError') {
        console.log('Submission was aborted');
        return;
      }

      setState((prev) => ({
        ...prev,
        submissionError: error.message || 'Failed to update contact',
        isSubmitting: false,
      }));
    }
  };

  const reset = () => {
    abortControllerRef.current?.abort();
    setState({
      step: 'select',
      selectedContact: null,
      contactDetails: null,
      isSubmitting: false,
      submissionError: null,
    });
  };

  const cleanup = () => {
    abortControllerRef.current?.abort();
  };

  return {
    // Getters
    currentStep: state.step,
    selectedContact: state.selectedContact,
    contactDetails: state.contactDetails,
    isSubmitting: state.isSubmitting,
    submissionError: state.submissionError,
    canProceedToNextStep: canProceedToNextStep(),
    canGoBack,

    // Actions
    setContactDetails,
    onSelectedContact,
    nextStep,
    prevStep,
    submit,
    reset,
    cleanup,
  };
};

export default useViewContactWizard;