import { Controller } from "@hotwired/stimulus"

export default class extends Controller {
  static targets = ["select", "phoneField", "birthYearField", "firstNameField", "surnameField", "newCustomerFields"]
  static values = {
    existingId: String,
    existingLabel: String
  }

  connect() {
    let initialOptions = [];
    let initialValue = null;

    if (this.hasExistingIdValue && this.hasExistingLabelValue && this.existingIdValue.length > 0) {
      initialOptions = [{ id: this.existingIdValue, label: this.existingLabelValue }];
      initialValue = this.existingIdValue;
    }

    this.selectInstance = new TomSelect(this.selectTarget, {
      valueField: 'id',
      labelField: 'label',
      searchField: ['label'],
      maxItems: 1,
      create: true,
      createOnBlur: true,
      placeholder: 'Type to search customers...',
      
      create: function(input) {
        return {
          id: `${input}__new`,
          label: `${input} (New Customer)`
        };
      },
      
      options: initialOptions,
      items: initialValue ? [initialValue] : [],
      
      load: async (query, callback) => {
        if (!query.length && !initialValue) return callback();
        
        try {
          const response = await fetch(`/customers/search?q=${encodeURIComponent(query)}`, {
            headers: {
              'Accept': 'application/json',
              'X-Requested-With': 'XMLHttpRequest'
            }
          });
          const data = await response.json();
          
          const existingOptionId = this.hasExistingIdValue ? this.existingIdValue : null;
          const filteredData = data.filter(item => item.id !== existingOptionId);
          
          callback(filteredData);
        } catch (error) {
          console.error('Error loading customers:', error);
          callback();
        }
      },

      shouldLoad: function(query) {
        return query.length >= 2;
      },
      
      render: {
        no_results: (data, escape) => {
          return '<div class="no-results">No customers found. Fill in the details below.</div>';
        },
        option: function(item) {
          return `<div>${item.label}</div>`;
        }
      },

      onLoad: (data) => {
        if (!this.selectInstance.getValue() && (!data || data.length === 0)) {
          this.showNewCustomerFields();
        }
      },
      
      onChange: (value) => {
        if (value === null || value === '') {
          this.showNewCustomerFields();
        } else if (!value.endsWith('__new')) {
            this.newCustomerFieldsTarget.classList.add('hidden');
        } 
      },

      onItemAdd: (value) => {
        this.customerSelected(value);
      },

      onDropdownClose: (dropdown) => {
        if (!this.selectInstance.getValue()) {
          this.showNewCustomerFields();
        }
      }
    });

    if (initialValue) {
       this.newCustomerFieldsTarget.classList.add('hidden');
       this.customerSelected(initialValue); 
    }
  }

  customerSelected(value) {
    if (value.endsWith('__new')) {
      const firstName = value.replace('__new', '');
      this.firstNameFieldTarget.value = firstName;
      this.showNewCustomerFields();
      return;
    }

    const [firstName, surname, phone] = value.split('_');
    
    if (firstName && surname && phone) {
      const customerData = this.selectInstance.options[value];
      
      this.phoneFieldTarget.value = phone;
      this.firstNameFieldTarget.value = firstName;
      this.surnameFieldTarget.value = surname;
      
      if (customerData && customerData.birthyear) {
        this.birthYearFieldTarget.value = customerData.birthyear;
      } else {
         this.birthYearFieldTarget.value = '';
      }
      
      this.newCustomerFieldsTarget.classList.add('hidden');
    } else {
      console.warn("Selected customer value format unexpected:", value);
      this.clearFields();
      this.showNewCustomerFields();
    }
  }

  showNewCustomerFields() {
    this.newCustomerFieldsTarget.classList.remove('hidden');
  }

  clearFields() {
    this.phoneFieldTarget.value = '';
    this.firstNameFieldTarget.value = '';
    this.surnameFieldTarget.value = '';
    this.birthYearFieldTarget.value = '';
  }

  disconnect() {
    if (this.selectInstance) {
      this.selectInstance.destroy();
    }
  }
}