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

import { tokenService } from '../../services/TokenService';
import {
  sendMessageApi,
  SendInstantMessageRequest,
} from '../../api/sendMessageApi';

const useSendMessageWizard = () => {
  const [state, setState] = useState({
    step: 'select',
    selectedContacts: [],
    message: '',
    createdMessage: null,
    isSubmitting: false,
    submissionError: null,
  });

  const abortControllerRef = useRef(null);

  // Computed values
  const canProceedToNextStep = useCallback(() => {
    switch (state.step) {
      case 'select':
        return state.selectedContacts.length > 0;
      case 'message':
        return state.message.trim().length > 0;
      case 'confirm':
        return true;
      default:
        return false;
    }
  }, [state.step, state.selectedContacts.length, state.message]);

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

  // Actions
  const toggleContact = (contactId) => {
    setState((prev) => ({
      ...prev,
      selectedContacts: prev.selectedContacts.includes(contactId)
        ? prev.selectedContacts.filter((id) => id !== contactId)
        : [...prev.selectedContacts, contactId],
    }));
  };

  const setMessage = (message) => {
    setState((prev) => ({ ...prev, message }));
  };

  const setCreatedMessage = (message) => {
    console.log('Setting created message');
    setState((prev) => ({ ...prev, createdMessage: message }));
  };

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

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

  const prevStep = () => {
    const stepOrder = ['select', 'message', '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('Sending message');
      let reqBod = new SendInstantMessageRequest();
      reqBod.user_id = tokenService.getUserId();
      reqBod.message_id = state.createdMessage.id;
      state.selectedContacts.forEach((selectedContact) => {
        reqBod.contact_ids.push(selectedContact);
      });
      const response = await sendMessageApi.sendInstantMessage(
        reqBod,
        tokenService.bearerToken()
      );

      if (response) {
        // Success - move to result step
        setState((prev) => ({
          ...prev,
          step: 'result',
          isSubmitting: false,
        }));
      }
    } catch (error) {
      if (error.name === 'AbortError') {
        console.log('Submission was aborted');
        return;
      }

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

  const reset = () => {
    abortControllerRef.current?.abort();
    setState({
      step: 'select',
      selectedContacts: [],
      message: '',
      createdMessage: null,
      isSubmitting: false,
      submissionError: null,
    });
  };

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

  return {
    // Getters
    currentStep: state.step,
    selectedContacts: state.selectedContacts,
    message: state.message,
    createdMessage: state.createdMessage,
    isSubmitting: state.isSubmitting,
    submissionError: state.submissionError,
    canProceedToNextStep: canProceedToNextStep(),
    canGoBack,

    // Actions
    toggleContact,
    setMessage,
    setCreatedMessage,
    nextStep,
    prevStep,
    submit,
    reset,
    cleanup,
  };
};

export default useSendMessageWizard;