// NG2
import { Component, ElementRef, EventEmitter, Input, Output, OnDestroy, OnInit } from '@angular/core';
// APP
import { OutsideClick } from '../../utils/outside-click/OutsideClick';
import { KeyCodes } from '../../utils/key-codes/KeyCodes';
import { Helpers } from '../../utils/Helpers';
import { NovoLabelService } from '../../services/novo-label-service';

@Component({
    selector: 'novo-category-dropdown',
    template: `
        <ng-content select="button"></ng-content>
        <div class="dropdown-container" *ngIf="active">
            <div class="novo-category-dropdown-search" *ngIf="search" data-automation-id="novo-category-dropdown-search">
                <input type="text" [placeholder]="search.placeholder || labels.search" [value]="_query" (input)="queryCategories($event.target.value)"/>
                <i class="bhi-search" *ngIf="!_query"></i>
                <i class="bhi-times" *ngIf="_query" (click)="clearQuery($event)"></i>
            </div>
            <novo-nav theme="white" [outlet]="novoCategoryDropdownOutlet" direction="vertical">
                <novo-tab *ngFor="let category of _categories" [attr.data-automation-id]="category" (activeChange)="onCategorySelected(category)">
                    <span>{{ category }} ({{ _categoryMap[category].length }})</span>
                </novo-tab>
            </novo-nav>
            <novo-nav-outlet #novoCategoryDropdownOutlet>
                <novo-nav-content *ngFor="let category of _categories">
                    <novo-list direction="vertical">
                        <novo-list-item *ngFor="let item of _categoryMap[category]" (click)="select($event, item)" [attr.data-automation-id]="item.label">
                            <item-content>{{ item.label }}</item-content>
                            <item-end class="novo-category-dropdown-hover" *ngIf="item.hoverText && !item.selected">{{ item.hoverText }}</item-end>
                            <item-end class="novo-category-dropdown-hover" *ngIf="item.hoverIcon && !item.selected"><i class="bhi-{{ item.hoverIcon }}"></i></item-end>
                            <item-end *ngIf="item.selected"><i class="bhi-check"></i></item-end>
                        </novo-list-item>
                        <novo-list-item *ngIf="_categoryMap[category].length === 0 && search" class="novo-category-dropdown-empty-item">
                            <item-content>{{ search.emptyMessage || labels.noItems }}</item-content>
                        </novo-list-item>
                    </novo-list>
                </novo-nav-content>
            </novo-nav-outlet>
            <footer *ngIf="footer" class="novo-category-dropdown-footer-align-{{ footer.align || 'right' }}">
                <a *ngFor="let link of footer.links" (click)="executeClickCallback($event, link)">{{ link.label }}</a>
            </footer>
        </div>
    `,
    host: {
        '(keydown)': 'onKeyDown($event)',
        '[class.active]': 'active'
    }
})
export class NovoCategoryDropdownElement extends OutsideClick implements OnInit, OnDestroy {
    _query: string = '';
    _categoryMap: any = {};
    _categories: string[] = [];
    clickHandler: Function;
    _masterCategoryMap: any;
    _queryTimeout: any;
    // Boolean to keep the selection persist when closing the dropdown
    @Input() persistSelection: boolean = false;
    // Boolean to close the dropdown on selection
    @Input() closeOnSelect: boolean = false;
    // Search Config
    // {
    //   placeholder: 'STRING' // defaults to "SEARCH" - placeholder for search input
    //   emptyMessage: 'STRING' // defaults to "There are no items." - empty message when there are no items in the category
    //   debounce: 'NUMBER (in MS)' // defaults to 300ms - debounce time for the search
    //   compare: 'FUNCTION' // default to simple indexOf - compare function for category search, should accept (query, item) and return true/false
    // }
    @Input() search: any;
    // Footer config
    // {
    //   align: 'STRING' // defaults to "right" - alignment of the links
    //   links: 'ARRAY' // array of links to go into the footer, be away of spacing - { label, callback } for the object inside
    // }
    @Input() footer: any;
    // Event that is emitted whenever an item is selected
    @Output('itemSelected') _select: EventEmitter<any> = new EventEmitter();
    // Event that is emitted whenever a category is selected
    @Output() categorySelected: EventEmitter<any> = new EventEmitter<any>();

    @Input()
    set categories(categories: any) {
        this._masterCategoryMap = Object.assign({}, categories);
        this._categoryMap = Object.assign({}, categories);
        this._categories = Object.keys(categories);
    }

    constructor(element: ElementRef, public labels: NovoLabelService) {
        super(element);
        this.clickHandler = this.toggleActive.bind(this);
    }

    ngOnInit() {
        let button = this.element.nativeElement.querySelector('button');
        button.addEventListener('click', this.clickHandler);
    }

    ngOnDestroy() {
        let button = this.element.nativeElement.querySelector('button');
        if (button) {
            button.removeEventListener('click', this.clickHandler);
        }
    }

    onKeyDown(event) {
        if (this.active && (event.keyCode === KeyCodes.ESC || event.keyCode === KeyCodes.ENTER)) {
            this.toggleActive();
        }
    }

    clearSelection() {
        this._categories.forEach(category => {
            this._categoryMap[category].forEach(item => {
                item.selected = false;
            });
        });
    }

    select(event, item) {
        Helpers.swallowEvent(event);
        // If we persist the selection, clear and show a check
        if (this.persistSelection) {
            this.clearSelection();
            item.selected = true;
        }
        // Emit the item
        this._select.emit(item);
        // Close, if input is set
        if (this.closeOnSelect) {
            this.toggleActive();
        }
    }

    onCategorySelected(category) {
        this.categorySelected.emit(category);
    }

    clearQuery(event) {
        Helpers.swallowEvent(event);
        this._query = '';
        // Reset the categories
        this._categories.forEach(category => {
            this._categoryMap[category] = this._masterCategoryMap[category];
        });
    }

    queryCategories(query) {
        // Save the query
        this._query = query;
        // Check timeout
        if (this._queryTimeout) {
            clearTimeout(this._queryTimeout);
        }
        // Store a timeout, to debounce user input
        this._queryTimeout = setTimeout(() => {
            this._categories.forEach(category => {
                if (this.search.compare) {
                    this._categoryMap[category] = this._masterCategoryMap[category].filter(item => this.search.compare(query, item));
                } else {
                    this._categoryMap[category] = this._masterCategoryMap[category].filter(item => ~item.label.toLowerCase().indexOf(query.toLowerCase()));
                }
            });
        }, this.search.debounce || 300);
    }

    executeClickCallback(event, link) {
        link.callback(event);
        // Close, if input is set
        if (this.closeOnSelect) {
            this.toggleActive();
        }
    }
}