// Helpers
import { wrapInArray, sortItems, deepEqual, groupByProperty, searchItems } from '../../util/helpers';
import Vue from 'vue';
export default Vue.extend({
  name: 'v-data',
  inheritAttrs: false,
  props: {
    items: {
      type: Array,
      default: () => []
    },
    options: {
      type: Object,
      default: () => ({})
    },
    sortBy: {
      type: [String, Array],
      default: () => []
    },
    sortDesc: {
      type: [Boolean, Array],
      default: () => []
    },
    customSort: {
      type: Function,
      default: sortItems
    },
    mustSort: Boolean,
    multiSort: Boolean,
    page: {
      type: Number,
      default: 1
    },
    itemsPerPage: {
      type: Number,
      default: 10
    },
    groupBy: {
      type: [String, Array],
      default: () => []
    },
    groupDesc: {
      type: [Boolean, Array],
      default: () => []
    },
    locale: {
      type: String,
      default: 'en-US'
    },
    disableSort: Boolean,
    disablePagination: Boolean,
    disableFiltering: Boolean,
    search: String,
    customFilter: {
      type: Function,
      default: searchItems
    },
    serverItemsLength: {
      type: Number,
      default: -1
    }
  },

  data() {
    return {
      internalOptions: {
        page: this.page,
        itemsPerPage: this.itemsPerPage,
        sortBy: wrapInArray(this.sortBy),
        sortDesc: wrapInArray(this.sortDesc),
        groupBy: wrapInArray(this.groupBy),
        groupDesc: wrapInArray(this.groupDesc),
        mustSort: this.mustSort,
        multiSort: this.multiSort
      }
    };
  },

  computed: {
    itemsLength() {
      return this.serverItemsLength >= 0 ? this.serverItemsLength : this.filteredItems.length;
    },

    pageCount() {
      return this.internalOptions.itemsPerPage === -1 ? 1 : Math.ceil(this.itemsLength / this.internalOptions.itemsPerPage); // TODO: can't use items.length here
    },

    pageStart() {
      if (this.internalOptions.itemsPerPage === -1 || !this.items.length) return 0;
      return (this.internalOptions.page - 1) * this.internalOptions.itemsPerPage;
    },

    pageStop() {
      if (this.internalOptions.itemsPerPage === -1) return this.itemsLength;
      if (!this.items.length) return 0;
      return Math.min(this.itemsLength, this.internalOptions.page * this.internalOptions.itemsPerPage);
    },

    isGrouped() {
      return !!this.internalOptions.groupBy.length;
    },

    pagination() {
      return {
        page: this.internalOptions.page,
        itemsPerPage: this.internalOptions.itemsPerPage,
        pageStart: this.pageStart,
        pageStop: this.pageStop,
        pageCount: this.pageCount,
        itemsLength: this.itemsLength
      };
    },

    filteredItems() {
      let items = this.items.slice();

      if (!this.disableFiltering && this.serverItemsLength <= 0) {
        items = this.customFilter(items, this.search);
      }

      return items;
    },

    computedItems() {
      let items = this.filteredItems.slice();

      if (!this.disableSort && this.serverItemsLength <= 0) {
        items = this.sortItems(items);
      }

      if (!this.disablePagination && this.serverItemsLength <= 0) {
        items = this.paginateItems(items);
      }

      return items;
    },

    groupedItems() {
      return this.isGrouped ? groupByProperty(this.computedItems, this.internalOptions.groupBy[0]) : null;
    },

    scopedProps() {
      const props = {
        sort: this.sort,
        sortArray: this.sortArray,
        group: this.group,
        items: this.computedItems,
        options: this.internalOptions,
        updateOptions: this.updateOptions,
        pagination: this.pagination,
        groupedItems: this.groupedItems
      };
      return props;
    }

  },
  watch: {
    options: {
      handler(options, old) {
        if (deepEqual(options, old)) return;
        this.updateOptions(options);
      },

      deep: true,
      immediate: true
    },
    internalOptions: {
      handler(options, old) {
        if (deepEqual(options, old)) return;
        this.$emit('update:options', options);
        this.$emit('pagination', this.pagination);
      },

      deep: true,
      immediate: true
    },

    page(page) {
      this.updateOptions({
        page
      });
    },

    'internalOptions.page'(page) {
      this.$emit('update:page', page);
    },

    itemsPerPage(itemsPerPage) {
      this.updateOptions({
        itemsPerPage
      });
    },

    'internalOptions.itemsPerPage'(itemsPerPage) {
      this.$emit('update:items-per-page', itemsPerPage);
    },

    sortBy(sortBy) {
      this.updateOptions({
        sortBy: wrapInArray(sortBy)
      });
    },

    'internalOptions.sortBy'(sortBy, old) {
      !deepEqual(sortBy, old) && this.$emit('update:sort-by', Array.isArray(this.sortBy) ? sortBy : sortBy[0]);
    },

    sortDesc(sortDesc) {
      this.updateOptions({
        sortDesc: wrapInArray(sortDesc)
      });
    },

    'internalOptions.sortDesc'(sortDesc, old) {
      !deepEqual(sortDesc, old) && this.$emit('update:sort-desc', Array.isArray(this.sortDesc) ? sortDesc : sortDesc[0]);
    },

    groupBy(groupBy) {
      this.updateOptions({
        groupBy: wrapInArray(groupBy)
      });
    },

    'internalOptions.groupBy'(groupBy, old) {
      !deepEqual(groupBy, old) && this.$emit('update:group-by', Array.isArray(this.groupBy) ? groupBy : groupBy[0]);
    },

    groupDesc(groupDesc) {
      this.updateOptions({
        groupDesc: wrapInArray(groupDesc)
      });
    },

    'internalOptions.groupDesc'(groupDesc, old) {
      !deepEqual(groupDesc, old) && this.$emit('update:group-desc', Array.isArray(this.groupDesc) ? groupDesc : groupDesc[0]);
    },

    multiSort(multiSort) {
      this.updateOptions({
        multiSort
      });
    },

    'internalOptions.multiSort'(multiSort) {
      this.$emit('update:multi-sort', multiSort);
    },

    mustSort(mustSort) {
      this.updateOptions({
        mustSort
      });
    },

    'internalOptions.mustSort'(mustSort) {
      this.$emit('update:must-sort', mustSort);
    },

    pageCount: {
      handler(pageCount) {
        this.$emit('page-count', pageCount);
      },

      immediate: true
    },
    computedItems: {
      handler(computedItems) {
        this.$emit('current-items', computedItems);
      },

      immediate: true
    }
  },
  methods: {
    toggle(key, oldBy, oldDesc, page, mustSort, multiSort) {
      let by = oldBy.slice();
      let desc = oldDesc.slice();
      const byIndex = by.findIndex(k => k === key);

      if (byIndex < 0) {
        if (!multiSort) {
          by = [];
          desc = [];
        }

        by.push(key);
        desc.push(false);
      } else if (byIndex >= 0 && !desc[byIndex]) {
        desc[byIndex] = true;
      } else if (!mustSort) {
        by.splice(byIndex, 1);
        desc.splice(byIndex, 1);
      } else {
        desc[byIndex] = false;
      } // Reset page to 1 if sortBy or sortDesc have changed


      if (!deepEqual(by, oldBy) || !deepEqual(desc, oldDesc)) {
        page = 1;
      }

      return {
        by,
        desc,
        page
      };
    },

    group(key) {
      const {
        by: groupBy,
        desc: groupDesc,
        page
      } = this.toggle(key, this.internalOptions.groupBy, this.internalOptions.groupDesc, this.internalOptions.page, true, false);
      this.updateOptions({
        groupBy,
        groupDesc,
        page
      });
    },

    sort(key) {
      if (Array.isArray(key)) return this.sortArray(key);
      const {
        by: sortBy,
        desc: sortDesc,
        page
      } = this.toggle(key, this.internalOptions.sortBy, this.internalOptions.sortDesc, this.internalOptions.page, this.mustSort, this.multiSort);
      this.updateOptions({
        sortBy,
        sortDesc,
        page
      });
    },

    sortArray(sortBy) {
      const sortDesc = sortBy.map(s => {
        const i = this.internalOptions.sortBy.findIndex(k => k === s);
        return i > -1 ? this.internalOptions.sortDesc[i] : false;
      });
      this.updateOptions({
        sortBy,
        sortDesc
      });
    },

    updateOptions(options) {
      this.internalOptions = { ...this.internalOptions,
        ...options,
        page: Math.max(1, Math.min(options.page || this.internalOptions.page, this.pageCount))
      };
    },

    sortItems(items) {
      const sortBy = this.internalOptions.groupBy.concat(this.internalOptions.sortBy);
      const sortDesc = this.internalOptions.groupDesc.concat(this.internalOptions.sortDesc);
      return this.customSort(items, sortBy, sortDesc, this.locale);
    },

    paginateItems(items) {
      // Make sure we don't try to display non-existant page if items suddenly change
      // TODO: Could possibly move this to pageStart/pageStop?
      if (items.length < this.pageStart) this.internalOptions.page = 1;
      return items.slice(this.pageStart, this.pageStop);
    }

  },

  render() {
    return this.$scopedSlots.default && this.$scopedSlots.default(this.scopedProps);
  }

});
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