// Styles
import "../../../src/components/VAutocomplete/VAutocomplete.sass"; // Extensions

import VSelect, { defaultMenuProps as VSelectMenuProps } from '../VSelect/VSelect';
import VTextField from '../VTextField/VTextField'; // Utilities

import mergeData from '../../util/mergeData';
import { getObjectValueByPath, getPropertyFromItem, keyCodes } from '../../util/helpers';
const defaultMenuProps = { ...VSelectMenuProps,
  offsetY: true,
  offsetOverflow: true,
  transition: false
};
/* @vue/component */

export default VSelect.extend({
  name: 'v-autocomplete',
  props: {
    allowOverflow: {
      type: Boolean,
      default: true
    },
    autoSelectFirst: {
      type: Boolean,
      default: false
    },
    filter: {
      type: Function,
      default: (item, queryText, itemText) => {
        return itemText.toLocaleLowerCase().indexOf(queryText.toLocaleLowerCase()) > -1;
      }
    },
    hideNoData: Boolean,
    menuProps: {
      type: VSelect.options.props.menuProps.type,
      default: () => defaultMenuProps
    },
    noFilter: Boolean,
    searchInput: {
      type: String,
      default: undefined
    }
  },

  data() {
    return {
      lazySearch: this.searchInput
    };
  },

  computed: {
    classes() {
      return { ...VSelect.options.computed.classes.call(this),
        'v-autocomplete': true,
        'v-autocomplete--is-selecting-index': this.selectedIndex > -1
      };
    },

    computedItems() {
      return this.filteredItems;
    },

    selectedValues() {
      return this.selectedItems.map(item => this.getValue(item));
    },

    hasDisplayedItems() {
      return this.hideSelected ? this.filteredItems.some(item => !this.hasItem(item)) : this.filteredItems.length > 0;
    },

    currentRange() {
      if (this.selectedItem == null) return 0;
      return String(this.getText(this.selectedItem)).length;
    },

    filteredItems() {
      if (!this.isSearching || this.noFilter || this.internalSearch == null) return this.allItems;
      return this.allItems.filter(item => {
        const value = getPropertyFromItem(item, this.itemText);
        const text = value != null ? String(value) : '';
        return this.filter(item, String(this.internalSearch), text);
      });
    },

    internalSearch: {
      get() {
        return this.lazySearch;
      },

      set(val) {
        this.lazySearch = val;
        this.$emit('update:search-input', val);
      }

    },

    isAnyValueAllowed() {
      return false;
    },

    isDirty() {
      return this.searchIsDirty || this.selectedItems.length > 0;
    },

    isSearching() {
      return this.multiple && this.searchIsDirty || this.searchIsDirty && this.internalSearch !== this.getText(this.selectedItem);
    },

    menuCanShow() {
      if (!this.isFocused) return false;
      return this.hasDisplayedItems || !this.hideNoData;
    },

    $_menuProps() {
      const props = VSelect.options.computed.$_menuProps.call(this);
      props.contentClass = `v-autocomplete__content ${props.contentClass || ''}`.trim();
      return { ...defaultMenuProps,
        ...props
      };
    },

    searchIsDirty() {
      return this.internalSearch != null && this.internalSearch !== '';
    },

    selectedItem() {
      if (this.multiple) return null;
      return this.selectedItems.find(i => {
        return this.valueComparator(this.getValue(i), this.getValue(this.internalValue));
      });
    },

    listData() {
      const data = VSelect.options.computed.listData.call(this);
      data.props = { ...data.props,
        items: this.virtualizedItems,
        noFilter: this.noFilter || !this.isSearching || !this.filteredItems.length,
        searchInput: this.internalSearch
      };
      return data;
    }

  },
  watch: {
    filteredItems: 'onFilteredItemsChanged',
    internalValue: 'setSearch',

    isFocused(val) {
      if (val) {
        document.addEventListener('copy', this.onCopy);
        this.$refs.input && this.$refs.input.select();
      } else {
        document.removeEventListener('copy', this.onCopy);
        this.updateSelf();
      }
    },

    isMenuActive(val) {
      if (val || !this.hasSlot) return;
      this.lazySearch = undefined;
    },

    items(val, oldVal) {
      // If we are focused, the menu
      // is not active, hide no data is enabled,
      // and items change
      // User is probably async loading
      // items, try to activate the menu
      if (!(oldVal && oldVal.length) && this.hideNoData && this.isFocused && !this.isMenuActive && val.length) this.activateMenu();
    },

    searchInput(val) {
      this.lazySearch = val;
    },

    internalSearch: 'onInternalSearchChanged',
    itemText: 'updateSelf'
  },

  created() {
    this.setSearch();
  },

  methods: {
    onFilteredItemsChanged(val, oldVal) {
      // TODO: How is the watcher triggered
      // for duplicate items? no idea
      if (val === oldVal) return;
      this.setMenuIndex(-1);
      this.$nextTick(() => {
        if (!this.internalSearch || val.length !== 1 && !this.autoSelectFirst) return;
        this.$refs.menu.getTiles();
        this.setMenuIndex(0);
      });
    },

    onInternalSearchChanged() {
      this.updateMenuDimensions();
    },

    updateMenuDimensions() {
      // Type from menuable is not making it through
      this.isMenuActive && this.$refs.menu && this.$refs.menu.updateDimensions();
    },

    changeSelectedIndex(keyCode) {
      // Do not allow changing of selectedIndex
      // when search is dirty
      if (this.searchIsDirty) return;

      if (this.multiple && keyCode === keyCodes.left) {
        if (this.selectedIndex === -1) {
          this.selectedIndex = this.selectedItems.length - 1;
        } else {
          this.selectedIndex--;
        }
      } else if (this.multiple && keyCode === keyCodes.right) {
        if (this.selectedIndex >= this.selectedItems.length - 1) {
          this.selectedIndex = -1;
        } else {
          this.selectedIndex++;
        }
      } else if (keyCode === keyCodes.backspace || keyCode === keyCodes.delete) {
        this.deleteCurrentItem();
      }
    },

    deleteCurrentItem() {
      const curIndex = this.selectedIndex;
      const curItem = this.selectedItems[curIndex]; // Do nothing if input or item is disabled

      if (!this.isInteractive || this.getDisabled(curItem)) return;
      const lastIndex = this.selectedItems.length - 1; // Select the last item if
      // there is no selection

      if (this.selectedIndex === -1 && lastIndex !== 0) {
        this.selectedIndex = lastIndex;
        return;
      }

      const length = this.selectedItems.length;
      const nextIndex = curIndex !== length - 1 ? curIndex : curIndex - 1;
      const nextItem = this.selectedItems[nextIndex];

      if (!nextItem) {
        this.setValue(this.multiple ? [] : undefined);
      } else {
        this.selectItem(curItem);
      }

      this.selectedIndex = nextIndex;
    },

    clearableCallback() {
      this.internalSearch = undefined;
      VSelect.options.methods.clearableCallback.call(this);
    },

    genInput() {
      const input = VTextField.options.methods.genInput.call(this);
      input.data = mergeData(input.data, {
        attrs: {
          'aria-activedescendant': getObjectValueByPath(this.$refs.menu, 'activeTile.id'),
          autocomplete: getObjectValueByPath(input.data, 'attrs.autocomplete', 'off')
        },
        domProps: {
          value: this.internalSearch
        }
      });
      return input;
    },

    genInputSlot() {
      const slot = VSelect.options.methods.genInputSlot.call(this);
      slot.data.attrs.role = 'combobox';
      return slot;
    },

    genSelections() {
      return this.hasSlot || this.multiple ? VSelect.options.methods.genSelections.call(this) : [];
    },

    onClick(e) {
      if (!this.isInteractive) return;
      this.selectedIndex > -1 ? this.selectedIndex = -1 : this.onFocus();
      if (!this.isAppendInner(e.target)) this.activateMenu();
    },

    onInput(e) {
      if (this.selectedIndex > -1 || !e.target) return;
      const target = e.target;
      const value = target.value; // If typing and menu is not currently active

      if (target.value) this.activateMenu();
      this.internalSearch = value;
      this.badInput = target.validity && target.validity.badInput;
    },

    onKeyDown(e) {
      const keyCode = e.keyCode;
      VSelect.options.methods.onKeyDown.call(this, e); // The ordering is important here
      // allows new value to be updated
      // and then moves the index to the
      // proper location

      this.changeSelectedIndex(keyCode);
    },

    onSpaceDown(e) {},

    onTabDown(e) {
      VSelect.options.methods.onTabDown.call(this, e);
      this.updateSelf();
    },

    onUpDown(e) {
      // Prevent screen from scrolling
      e.preventDefault(); // For autocomplete / combobox, cycling
      // interfers with native up/down behavior
      // instead activate the menu

      this.activateMenu();
    },

    selectItem(item) {
      VSelect.options.methods.selectItem.call(this, item);
      this.setSearch();
    },

    setSelectedItems() {
      VSelect.options.methods.setSelectedItems.call(this); // #4273 Don't replace if searching
      // #4403 Don't replace if focused

      if (!this.isFocused) this.setSearch();
    },

    setSearch() {
      // Wait for nextTick so selectedItem
      // has had time to update
      this.$nextTick(() => {
        if (!this.multiple || !this.internalSearch || !this.isMenuActive) {
          this.internalSearch = !this.selectedItems.length || this.multiple || this.hasSlot ? null : this.getText(this.selectedItem);
        }
      });
    },

    updateSelf() {
      if (!this.searchIsDirty && !this.internalValue) return;

      if (!this.valueComparator(this.internalSearch, this.getValue(this.internalValue))) {
        this.setSearch();
      }
    },

    hasItem(item) {
      return this.selectedValues.indexOf(this.getValue(item)) > -1;
    },

    onCopy(event) {
      if (this.selectedIndex === -1) return;
      const currentItem = this.selectedItems[this.selectedIndex];
      const currentItemText = this.getText(currentItem);
      event.clipboardData.setData('text/plain', currentItemText);
      event.clipboardData.setData('text/vnd.vuetify.autocomplete.item+plain', currentItemText);
      event.preventDefault();
    }

  }
});
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