import { ref, reactive, computed, watch, defineComponent, PropType } from 'vue';
import type { Recurrence, RecurrenceType } from '../../types';
import { DAYS_OF_WEEK, RECURRENCE_TYPE_OPTIONS } from '../../types';

export default defineComponent({
  name: 'RecurrenceSelector',

  props: {
    modelValue: {
      type: Object as PropType<Recurrence>,
      default: () => ({ type: 'once' })
    }
  },

  emits: ['update:modelValue'],

  setup(props, { emit }) {
    // State
    const localRecurrence = reactive<Recurrence>({
      type: 'once',
      daysOfWeek: [],
      customDates: [],
      startDate: '',
      endDate: '',
      excludedDates: []
    });

    const selectedDates = ref<string[]>([]);
    const excludedDates = ref<string[]>([]);

    // Opzioni
    const recurrenceTypes = RECURRENCE_TYPE_OPTIONS.map(opt => ({
      label: opt.label,
      value: opt.value,
      icon: opt.icon
    }));

    const daysOfWeek = DAYS_OF_WEEK;

    // Watch per sincronizzare con modelValue
    watch(() => props.modelValue, (newVal) => {
      if (newVal) {
        Object.assign(localRecurrence, newVal);

        if (newVal.customDates) {
          selectedDates.value = newVal.customDates.map(d =>
            typeof d === 'string' ? d : new Date(d).toISOString().split('T')[0]
          );
        }

        if (newVal.excludedDates) {
          excludedDates.value = newVal.excludedDates.map(d =>
            typeof d === 'string' ? d : new Date(d).toISOString().split('T')[0]
          );
        }
      }
    }, { immediate: true, deep: true });

    // Watch per emettere update
    watch([localRecurrence, selectedDates, excludedDates], () => {
      const result: Recurrence = {
        type: localRecurrence.type
      };

      if (localRecurrence.type !== 'once') {
        result.startDate = localRecurrence.startDate;
        result.endDate = localRecurrence.endDate;

        if (excludedDates.value.length > 0) {
          result.excludedDates = excludedDates.value;
        }
      }

      if (localRecurrence.type === 'weekly' || localRecurrence.type === 'custom_days') {
        result.daysOfWeek = localRecurrence.daysOfWeek;
      }

      if (localRecurrence.type === 'custom_dates') {
        result.customDates = selectedDates.value;
      }

      emit('update:modelValue', result);
    }, { deep: true });

    // Methods
    const isDaySelected = (day: number): boolean => {
      return localRecurrence.daysOfWeek?.includes(day) || false;
    };

    const toggleDay = (day: number) => {
      if (!localRecurrence.daysOfWeek) {
        localRecurrence.daysOfWeek = [];
      }

      const index = localRecurrence.daysOfWeek.indexOf(day);
      if (index === -1) {
        localRecurrence.daysOfWeek.push(day);
      } else {
        localRecurrence.daysOfWeek.splice(index, 1);
      }

      // Ordina i giorni
      localRecurrence.daysOfWeek.sort((a, b) => a - b);
    };

    const removeDate = (index: number) => {
      selectedDates.value.splice(index, 1);
    };

    const removeExcludedDate = (index: number) => {
      excludedDates.value.splice(index, 1);
    };

    const formatDate = (dateStr: string): string => {
      const date = new Date(dateStr);
      return date.toLocaleDateString('it-IT', {
        weekday: 'short',
        day: 'numeric',
        month: 'short'
      });
    };

    // Date options (solo date future)
    const dateOptions = (date: string): boolean => {
      const today = new Date();
      today.setHours(0, 0, 0, 0);
      const checkDate = new Date(date);
      return checkDate >= today;
    };

    const exclusionDateOptions = (date: string): boolean => {
      if (!localRecurrence.startDate || !localRecurrence.endDate) {
        return dateOptions(date);
      }
      const checkDate = new Date(date);
      const start = new Date(localRecurrence.startDate);
      const end = new Date(localRecurrence.endDate);
      return checkDate >= start && checkDate <= end;
    };

    // Riepilogo testuale
    const summaryText = computed(() => {
      switch (localRecurrence.type) {
        case 'once':
          return 'Viaggio singolo, senza ripetizioni';

        case 'weekly':
          if (!localRecurrence.daysOfWeek?.length) {
            return 'Seleziona i giorni della settimana';
          }
          const weeklyDays = localRecurrence.daysOfWeek
            .map(d => daysOfWeek.find(day => day.value === d)?.label)
            .join(', ');
          return `Ogni settimana: ${weeklyDays}`;

        case 'custom_days':
          if (!localRecurrence.daysOfWeek?.length) {
            return 'Seleziona i giorni della settimana';
          }
          const customDays = localRecurrence.daysOfWeek
            .map(d => daysOfWeek.find(day => day.value === d)?.label)
            .join(', ');
          return `Giorni selezionati: ${customDays}`;

        case 'custom_dates':
          if (!selectedDates.value.length) {
            return 'Seleziona le date dal calendario';
          }
          return `${selectedDates.value.length} date selezionate`;

        default:
          return '';
      }
    });

    return {
      // State
      localRecurrence,
      selectedDates,
      excludedDates,

      // Options
      recurrenceTypes,
      daysOfWeek,

      // Computed
      summaryText,

      // Methods
      isDaySelected,
      toggleDay,
      removeDate,
      removeExcludedDate,
      formatDate,
      dateOptions,
      exclusionDateOptions
    };
  }
});