const { get, isNone, run, isEmpty, makeArray } = Ember;
import computed from "ember-addons/ember-computed-decorators";
import UtilsMixin from "select-kit/mixins/utils";
import DomHelpersMixin from "select-kit/mixins/dom-helpers";
import EventsMixin from "select-kit/mixins/events";
import PluginApiMixin from "select-kit/mixins/plugin-api";
import {
  applyContentPluginApiCallbacks,
  applyHeaderContentPluginApiCallbacks,
  applyCollectionHeaderCallbacks
} from "select-kit/mixins/plugin-api";

export default Ember.Component.extend(UtilsMixin, PluginApiMixin, DomHelpersMixin, EventsMixin, {
  pluginApiIdentifiers: ["select-kit"],
  layoutName: "select-kit/templates/components/select-kit",
  classNames: ["select-kit"],
  classNameBindings: [
    "isLoading",
    "isFocused",
    "isExpanded",
    "isDisabled",
    "isHidden",
    "isAbove",
    "isBelow",
    "isLeftAligned",
    "isRightAligned",
    "hasSelection",
    "hasReachedLimit",
  ],
  isDisabled: false,
  isExpanded: false,
  isFocused: false,
  isHidden: false,
  isLoading: false,
  isAsync: false,
  renderedBodyOnce: false,
  renderedFilterOnce: false,
  tabindex: 0,
  none: null,
  highlighted: null,
  valueAttribute: "id",
  nameProperty: "name",
  autoFilterable: false,
  filterable: false,
  filter: "",
  previousFilter: "",
  filterPlaceholder: "select_kit.filter_placeholder",
  filterIcon: "search",
  headerIcon: null,
  rowComponent: "select-kit/select-kit-row",
  rowComponentOptions: null,
  noneRowComponent: "select-kit/select-kit-none-row",
  createRowComponent: "select-kit/select-kit-create-row",
  filterComponent: "select-kit/select-kit-filter",
  headerComponent: "select-kit/select-kit-header",
  headerComponentOptions: null,
  headerComputedContent: null,
  collectionHeaderComputedContent: null,
  collectionComponent: "select-kit/select-kit-collection",
  verticalOffset: 0,
  horizontalOffset: 0,
  fullWidthOnMobile: false,
  castInteger: false,
  allowAny: false,
  allowInitialValueMutation: false,
  content: null,
  computedContent: null,
  limitMatches: null,
  nameChanges: false,
  allowContentReplacement: false,
  collectionHeader: null,
  allowAutoSelectFirst: true,
  highlightedSelection: null,

  init() {
    this._super();

    this.noneValue = "__none__";
    this.set("headerComponentOptions", Ember.Object.create());
    this.set("rowComponentOptions", Ember.Object.create());
    this.set("computedContent", []);
    this.set("highlightedSelection", []);

    if (this.site && this.site.isMobileDevice) {
      this.setProperties({
        filterable: isNone(this.get("filterable")) ? false : this.get("filterable"),
        autoFilterable: isNone(this.get("autoFilterable")) ? false : this.get("filterable")
      });
    }

    if (this.get("nameChanges")) {
      this.addObserver(`content.@each.${this.get("nameProperty")}`, this, this._compute);
    }

    if (this.get("allowContentReplacement")) {
      this.addObserver(`content.[]`, this, this._compute);
    }

    if (this.get("isAsync")) {
      this.addObserver(`asyncContent.[]`, this, this._compute);
    }
  },

  keyDown(event) {
    if (!isEmpty(this.get("filter"))) return true;

    const keyCode = event.keyCode || event.which;

    if (event.metaKey === true && keyCode === this.keys.A) {
      this.didPressSelectAll();
      return false;
    }

    if (keyCode === this.keys.BACKSPACE) {
      this.didPressBackspace();
      return false;
    }
  },

  willDestroyElement() {
    this.removeObserver(`content.@each.${this.get("nameProperty")}`, this, this._compute);
    this.removeObserver(`content.[]`, this, this._compute);
    this.removeObserver(`asyncContent.[]`, this, this._compute);
  },

  willComputeAttributes() {},
  didComputeAttributes() {},

  willComputeContent(content) { return content; },
  computeContent(content) { return content; },
  _beforeDidComputeContent(content) {
    content = applyContentPluginApiCallbacks(this.get("pluginApiIdentifiers"), content, this);

    const existingCreatedComputedContent = this.get("computedContent").filterBy("created", true);
    this.setProperties({
      computedContent: content.map(c => this.computeContentItem(c)).concat(existingCreatedComputedContent)
    });
    return content;
  },
  didComputeContent() {},

  willComputeAsyncContent(content) { return content; },
  computeAsyncContent(content) { return content; },
  _beforeDidComputeAsyncContent(content) {
    content = applyContentPluginApiCallbacks(this.get("pluginApiIdentifiers"), content, this);
    this.setProperties({
      computedAsyncContent: content.map(c => this.computeAsyncContentItem(c))
    });
    return content;
  },
  didComputeAsyncContent() {},

  computeContentItem(contentItem, options) {
    let originalContent;
    options = options || {};
    const name = options.name;

    if (typeof contentItem === "string" || typeof contentItem === "number") {
      originalContent = {};
      originalContent[this.get("valueAttribute")] = contentItem;
      originalContent[this.get("nameProperty")] = name || contentItem;
    } else {
      originalContent = contentItem;
    }

    let computedContentItem = {
      value: this._castInteger(this.valueForContentItem(contentItem)),
      name: name || this._nameForContent(contentItem),
      locked: false,
      created: options.created || false,
      __sk_row_type: options.created ? "createRow" : null,
      originalContent
    };

    return computedContentItem;
  },

  computeAsyncContentItem(contentItem, options) {
    return this.computeContentItem(contentItem, options);
  },

  @computed("isAsync", "isLoading", "filteredAsyncComputedContent.[]", "filteredComputedContent.[]")
  collectionComputedContent(isAsync, isLoading, filteredAsyncComputedContent, filteredComputedContent) {
    if (isAsync) {
      return isLoading ? [] : filteredAsyncComputedContent;
    } else {
      return filteredComputedContent;
    }
  },

  validateCreate() { return !this.get("hasReachedLimit"); },

  validateSelect() { return !this.get("hasReachedLimit"); },

  @computed("limit", "selection.[]")
  hasReachedLimit(limit, selection) {
    if (!limit) return false;
    return selection.length >= limit;
  },

  @computed("shouldFilter", "allowAny", "filter")
  shouldDisplayFilter(shouldFilter, allowAny, filter) {
    if (shouldFilter) return true;
    if (allowAny && filter.length > 0) return true;
    return false;
  },

  @computed("filter", "collectionComputedContent.[]", "isLoading")
  noContentRow(filter, collectionComputedContent, isLoading) {
    if (filter.length > 0 && collectionComputedContent.length === 0 && !isLoading) {
      return I18n.t("select_kit.no_content");
    }
  },

  @computed("hasReachedLimit", "limit")
  maxContentRow(hasReachedLimit, limit) {
    if (hasReachedLimit) {
      return I18n.t("select_kit.max_content_reached", { count: limit });
    }
  },

  @computed("filter", "filterable", "autoFilterable", "renderedFilterOnce")
  shouldFilter(filter, filterable, autoFilterable, renderedFilterOnce) {
    if (renderedFilterOnce && filterable) return true;
    if (filterable) return true;
    if (autoFilterable && filter.length > 0) return true;
    return false;
  },

  @computed("computedValue", "filter", "collectionComputedContent.[]", "hasReachedLimit", "isLoading")
  shouldDisplayCreateRow(computedValue, filter, collectionComputedContent, hasReachedLimit, isLoading) {
    if (isLoading || hasReachedLimit) return false;
    if (collectionComputedContent.map(c => c.value).includes(filter)) return false;
    if (this.get("allowAny") && filter.length > 0 && this.validateCreate(filter)) return true;
    return false;
  },

  @computed("filter", "shouldDisplayCreateRow")
  createRowComputedContent(filter, shouldDisplayCreateRow) {
    if (shouldDisplayCreateRow) {
      let content = this.createContentFromInput(filter);
      let computedContentItem = this.computeContentItem(content, { created: true });
      computedContentItem.__sk_row_type = "createRow";
      return computedContentItem;
    }
  },

  @computed
  templateForRow() { return () => null; },

  @computed
  templateForNoneRow() { return () => null; },

  @computed("filter")
  templateForCreateRow() {
    return (rowComponent) => {
      return I18n.t("select_kit.create", {
        content: rowComponent.get("computedContent.name")
      });
    };
  },

  @computed("none")
  noneRowComputedContent(none) {
    if (isNone(none)) { return null; }
    let noneRowComputedContent;

    switch (typeof none) {
    case "string":
      noneRowComputedContent = this.computeContentItem(this.noneValue, {
        name: (I18n.t(none) || "").htmlSafe()
      });
      break;
    default:
      noneRowComputedContent = this.computeContentItem(none);
    }

    noneRowComputedContent.__sk_row_type = "noneRow";

    return noneRowComputedContent;
  },

  createContentFromInput(input) { return input; },

  highlightSelection(items) {
    this.propertyWillChange("highlightedSelection");
    this.set("highlightedSelection", makeArray(items));
    this.propertyDidChange("highlightedSelection");
  },

  clearHighlightSelection() {
    this.highlightSelection([]);
  },

  willSelect() {},
  didSelect() {},

  willCreate() {},
  didCreate() {},

  willDeselect() {},
  didDeselect() {},

  clearFilter() {
    this.$filterInput().val("");
    this.setProperties({ filter: "", previousFilter: "" });
  },

  startLoading() {
    this.set("isLoading", true);
    this.set("highlighted", null);
    this._boundaryActionHandler("onStartLoading");
  },

  stopLoading() {
    this.focus();
    this.set("isLoading", false);
    this._boundaryActionHandler("onStopLoading");
  },

  @computed("selection.[]", "isExpanded", "filter", "highlightedSelection.[]")
  collectionHeaderComputedContent() {
    return applyCollectionHeaderCallbacks(
      this.get("pluginApiIdentifiers"),
      this.get("collectionHeader"),
      this
    );
  },

  @computed("selection.[]", "isExpanded", "headerIcon")
  headerComputedContent() {
    return applyHeaderContentPluginApiCallbacks(
      this.get("pluginApiIdentifiers"),
      this.computeHeaderContent(),
      this
    );
  },

  _boundaryActionHandler(actionName, ...params) {
    if (get(this.actions, actionName)) {
      run.next(() => this.send(actionName, ...params));
    } else if (this.get(actionName)) {
      run.next(() => this.get(actionName)());
    }
  },

  highlight(computedContent) {
    this.set("highlighted", computedContent);
    this._boundaryActionHandler("onHighlight", computedContent);
  },

  clearSelection() {
    this.deselect(this.get("selection"));
    this.focus();
  },

  actions: {
    onToggle() {
      this.clearHighlightSelection();

      if (this.get("isExpanded")) {
        this.collapse();
      } else {
        this.expand();
      }
    },

    onClickRow(computedContentItem) {
      this.didClickRow(computedContentItem);
    },

    onClickSelectionItem(computedContentItem) {
      this.didClickSelectionItem(computedContentItem);
    },

    onClearSelection() {
      this.clearSelection();
    },

    onMouseoverRow(computedContentItem) {
      this.highlight(computedContentItem);
    },

    onFilterComputedContent(filter) {
      if (filter === this.get("previousFilter")) return;

      this.clearHighlightSelection();

      this.setProperties({
        highlighted: null,
        renderedFilterOnce: true,
        previousFilter: filter,
        filter
      });
      this.autoHighlight();
      this._boundaryActionHandler("onFilter", filter);
    }
  }
});