'use client';

import { getTranslation } from '@payloadcms/translations';
import { formatDocTitle } from '../../utilities/formatDocTitle/index.js';
const reduceToIDs = options => options.reduce((ids, option) => {
  if (option.options) {
    return [...ids, ...reduceToIDs(option.options)];
  }
  return [...ids, {
    id: option.value,
    relationTo: option.relationTo
  }];
}, []);
const sortOptions = options => options.sort((a, b) => {
  if (typeof a?.label?.localeCompare === 'function' && typeof b?.label?.localeCompare === 'function') {
    return a.label.localeCompare(b.label);
  }
  return 0;
});
export const optionsReducer = (state, action) => {
  switch (action.type) {
    case 'ADD':
      {
        const {
          collection,
          config,
          docs,
          i18n,
          ids = [],
          sort
        } = action;
        const relation = collection.slug;
        const loadedIDs = reduceToIDs(state);
        const newOptions = [...state];
        const optionsToAddTo = newOptions.find(optionGroup => optionGroup.label === collection.labels.plural);
        const newSubOptions = docs.reduce((docSubOptions, doc) => {
          if (loadedIDs.filter(item => item.id === doc.id && item.relationTo === relation).length === 0) {
            loadedIDs.push({
              id: doc.id,
              relationTo: relation
            });
            const docTitle = formatDocTitle({
              collectionConfig: collection,
              data: doc,
              dateFormat: config.admin.dateFormat,
              fallback: `${i18n.t('general:untitled')} - ID: ${doc.id}`,
              i18n
            });
            return [...docSubOptions, {
              label: docTitle,
              relationTo: relation,
              value: doc.id
            }];
          }
          return docSubOptions;
        }, []);
        ids.forEach(id => {
          if (loadedIDs.filter(item => item.id === id && item.relationTo === relation).length === 0) {
            loadedIDs.push({
              id,
              relationTo: relation
            });
            newSubOptions.push({
              allowEdit: false,
              label: `${i18n.t('general:untitled')} - ID: ${id}`,
              relationTo: relation,
              value: id
            });
          }
        });
        if (optionsToAddTo) {
          const subOptions = [...optionsToAddTo.options, ...newSubOptions];
          optionsToAddTo.options = sort ? sortOptions(subOptions) : subOptions;
        } else {
          newOptions.push({
            label: getTranslation(collection.labels.plural, i18n),
            options: sort ? sortOptions(newSubOptions) : newSubOptions
          });
        }
        return newOptions;
      }
    case 'CLEAR':
      {
        const exemptValues = action.exemptValues ? Array.isArray(action.exemptValues) ? action.exemptValues : [action.exemptValues] : [];
        const clearedStateWithExemptValues = state.filter(optionGroup => {
          const clearedOptions = optionGroup.options.filter(option => {
            if (exemptValues) {
              return exemptValues.some(exemptValue => {
                return exemptValue && option.value === exemptValue.value;
              });
            }
            return false;
          });
          optionGroup.options = clearedOptions;
          return clearedOptions.length > 0;
        });
        return clearedStateWithExemptValues;
      }
    case 'REMOVE':
      {
        const {
          id,
          collection
        } = action;
        const newOptions = [...state];
        const indexOfGroup = newOptions.findIndex(optionGroup => optionGroup.label === collection.labels.plural);
        if (indexOfGroup === -1) {
          return newOptions;
        }
        newOptions[indexOfGroup] = {
          ...newOptions[indexOfGroup],
          options: newOptions[indexOfGroup].options.filter(option => option.value !== id)
        };
        return newOptions;
      }
    case 'UPDATE':
      {
        const {
          collection,
          config,
          doc,
          i18n
        } = action;
        const relation = collection.slug;
        const newOptions = [...state];
        const docTitle = formatDocTitle({
          collectionConfig: collection,
          data: doc,
          dateFormat: config.admin.dateFormat,
          fallback: `${i18n.t('general:untitled')} - ID: ${doc.id}`,
          i18n
        });
        const foundOptionGroup = newOptions.find(optionGroup => optionGroup.label === collection.labels.plural);
        const foundOption = foundOptionGroup?.options?.find(option => option.value === doc.id);
        if (foundOption) {
          foundOption.label = docTitle;
          foundOption.relationTo = relation;
        }
        return newOptions;
      }
    default:
      {
        return state;
      }
  }
};
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