import {Component, ElementRef, OnInit, ViewChild, Input} from '@angular/core';
import {ActivatedRoute, Router} from '@angular/router';
import {HelpContentService} from '../../services/help-content.service';
import {FormBuilder, FormGroup, Validators} from '@angular/forms';
import {Portal} from '../../utils/entities/adminTool/portal';
import {EnvProperties} from '../../utils/properties/env-properties';
import {Session} from '../../login/utils/helper.class';
import {UserManagementService} from '../../services/user-management.service';
import {Subscriber, Subscription} from "rxjs";
import {properties} from "../../../../environments/environment";
import {StringUtils} from "../../utils/string-utils.class";
import {Title} from "@angular/platform-browser";
import {AlertModal} from '../../utils/modal/alert';
import {MenuItem} from '../../sharedComponents/menu';
import {SearchInputComponent} from '../../sharedComponents/search-input/search-input.component';
import {Page} from '../../utils/entities/adminTool/page';
import {Option} from '../../sharedComponents/input/input.component';

declare var UIkit;

@Component({
  selector: 'menuSelector',
  templateUrl: './menu.component.html',
	styles: [`
		.z-index-2 {
			z-index: 2;
		} 
	`]
})
export class MenuComponent implements OnInit {
	
	@ViewChild('searchInputComponent') searchInputComponent: SearchInputComponent;
	@ViewChild('editModal') editModal: AlertModal;
	@ViewChild('deleteModal') deleteModal: AlertModal;

	public activeRootMenuId: string;
	public activeRootMenu: MenuItem;
	public childrenMenuItems: MenuItem[] = [];
	
	private index: number;
	
	public menuItemForm: FormGroup;
	public pageForm: FormGroup;
	public rootMenuItems = [];
	public allPages = [];
	public menuRouteStatus: Map<string,boolean> = null;

	public selectedMenuItem: string;
	public isChild: boolean = false;
  
  public communities: Portal[] = [];
  public portal: string;
  
	public newPageWindowOpen: boolean = false;
  public showLoading = true;
  public isPortalAdministrator = null;
  public filterForm: FormGroup;
	public typeOptions: Option[] = [
		{label: 'Internal Link', value: 'internal'},
		{label: 'External Link', value: 'external'},
	]
	public rootOnlyTypeOptions: Option[] = [
		{label: 'No Action', value: 'noAction'}
	]

	public keyword: string = '';
	public selectedKeyword: string = '';
	private searchText: string = '';

	public properties: EnvProperties = properties;
  private subscriptions: any[] = [];
	private typeSub: Subscription = null;
  
  constructor(private element: ElementRef, private route: ActivatedRoute,
              private _router: Router, private title: Title,
              private _helpContentService: HelpContentService,
              private userManagementService: UserManagementService, private _fb: FormBuilder) {
  }
  
  ngOnInit() {
		this.filterForm = this._fb.group({
			keyword: [''],
		});
		this.subscriptions.push(this.filterForm.get('keyword').valueChanges.subscribe(value => {
			this.searchText = value.toLowerCase();
			this.applyFilters();
		}));
    this.userManagementService.getUserInfo().subscribe(user => {
      this.portal = (this.route.snapshot.data.portal) ? this.route.snapshot.data.portal : this.route.snapshot.params[this.route.snapshot.data.param];
			this.getMenuItems();
      if (this.route.snapshot.data.portal) {
        this.title.setTitle(StringUtils.capitalize(this.portal) + ' | Menu');
      } else if (this.route.snapshot.params[this.route.snapshot.data.param]) {
        this.title.setTitle(this.portal.toUpperCase() + ' | Menu');
      } else {
        this.title.setTitle('Administrator Dashboard | Menu');
      }
      this.isPortalAdministrator = Session.isPortalAdministrator(user) && !this.portal;
    });
  }
  
  ngOnDestroy(): void {
    this.subscriptions.forEach(value => {
      if (value instanceof Subscriber) {
        value.unsubscribe();
      } else if (value instanceof Function) {
        value();
      }
    });
		this.destroyTypeSubscription();
  }

	destroyTypeSubscription() {
		if(this.typeSub instanceof Subscriber) {
			this.typeSub.unsubscribe();
		}
	}

	getMenuItems() {
		this.subscriptions.push(
			this._helpContentService.getMenuItems(this.portal).subscribe(
				data => {
					this.rootMenuItems = data;
					if(data && data.length > 0) {
						this.changeActiveRootMenuItem(data[0]);
					}
					this.getPages();
					this.showLoading = false;
				},
				error => this.handleError("Server error fetching menu items", error)
			)
		);
	}

	getTypeOptions(isFeatured: boolean = false) {
		if(this.isChild) {
			return this.typeOptions;
		} else {
			if(isFeatured) {
				return this.typeOptions;
			} else {
				return this.typeOptions.concat(this.rootOnlyTypeOptions);
			}
		}
	}

	getActiveRootItem(id: string): MenuItem {
		return this.rootMenuItems.find(element => element['_id'] == id);
	}

	changeActiveRootMenuItem(item: MenuItem) {
		this.activeRootMenuId = item['_id'];
		this.activeRootMenu = item;
		this.childrenMenuItems = item.items;
		this.applyFilters();
	}

	getPages() {
		this.subscriptions.push(
			this._helpContentService.getCommunityPagesByType(this.portal, '', this.properties.adminToolsAPIURL).subscribe(
				data => {
					let pages = data;
					this.allPages = [];
					this.menuRouteStatus = new Map();
					for(let i = 0; i < pages.length; i++) {
						if(pages[i] && pages[i].name && pages[i].route) {
							this.allPages.push({value: pages[i].route, label: pages[i].name + (pages[i].isEnabled ? '' : ' [disabled]'), isEnabled: pages[i].isEnabled});
							this.rootMenuItems.forEach(parent => {
								if(parent.route == pages[i].route) {
									this.menuRouteStatus.set(parent._id, pages[i].isEnabled);
								}
								if(parent.items) {
									const found = parent.items.find(child => child.route == pages[i].route);
									if(found) {
										this.menuRouteStatus.set(found._id, pages[i].isEnabled);
									}
								}
							})
						}
					}
				},
				error => this.handleError("Server error fetching pages", error)
			)
		);
	}

	public newPageWindow() {
		this.newPageWindowOpen = !this.newPageWindowOpen;
		this.pageForm = this._fb.group({
      _id: this._fb.control(null),
      route: this._fb.control('', [Validators.required, StringUtils.validRoute(this.allPages, 'value')]),
      name: this._fb.control('', Validators.required),
      isEnabled: this._fb.control(true),
      portalType: this._fb.control(this.properties.adminToolsPortalType, Validators.required),
			portalPid: this._fb.control(this.portal),
      top: this._fb.control(true),
      bottom: this._fb.control(false),
      left: this._fb.control(false),
      right: this._fb.control(false),
      type: this._fb.control('html', Validators.required),
      entities: this._fb.control([''])
    });
	}

	public createPage() {
		if(!this.pageForm.value.route.startsWith('/')) {
			this.pageForm.value.route = '/'.concat(this.pageForm.value.route);
		}
		this.showLoading = true;
		this.subscriptions.push(
			this._helpContentService.savePage(<Page>this.pageForm.value, this.properties.adminToolsAPIURL).subscribe(
				page => {
					this.allPages.push({value: page.route, label: page.name});
					UIkit.notification('Page <b>' + page.name + '</b> has been <b>successfully created</b>', {
            status: 'success',
            timeout: 6000,
            pos: 'bottom-right'
          });
					this.newPageWindowOpen = !this.newPageWindowOpen;
					this.menuItemForm.get('route').setValue(page.route);
					this.menuItemForm.get('route').markAsDirty();
					this.showLoading = false;
				},
				error => this.handleError('System error creating page', error)
			)
		);
	}

	addValidatorForUrlOrRoute() {
		this.destroyTypeSubscription();
		this.typeSub = this.menuItemForm.get('type').valueChanges.subscribe(value => {
			setTimeout(() => {
				this.menuItemForm.controls['route'].clearValidators();
				this.menuItemForm.controls['url'].clearValidators();
				if(value === "internal") {
					this.menuItemForm.controls['route'].setValidators([Validators.required]);
				} else if(value === "external") {
					this.menuItemForm.controls['url'].setValidators([Validators.required, StringUtils.urlValidator()]);
				}
				this.menuItemForm.controls['route'].updateValueAndValidity();
				this.menuItemForm.controls['url'].updateValueAndValidity();
			}, 0);
		});
	}

	public newMenuItem(isChild: boolean = false) {
		this.menuItemForm = this._fb.group({
			_id: this._fb.control(""),
			title: this._fb.control("",Validators.required),
			type: this._fb.control("",Validators.required),
      route: this._fb.control(""),
			url: this._fb.control(""),
      isEnabled: this._fb.control(""),
			isFeatured: this._fb.control(false),
			parentItemId: this._fb.control(isChild ? this.activeRootMenuId : null)
		});
		this.isChild = isChild;
		this.addValidatorForUrlOrRoute();
		this.menuItemsModalOpen('Create Menu Item', 'Create');
	}

	public editMenuItem(menuItem: MenuItem, isChild: boolean = false) {
		this.menuItemForm = this._fb.group({
			_id: this._fb.control(menuItem['_id']),
			title: this._fb.control(menuItem.title,Validators.required),
			type: this._fb.control(menuItem['type'],Validators.required),
      route: this._fb.control(menuItem.route, (menuItem['type'] == "internal") ? [Validators.required] : []),
			url: this._fb.control(menuItem.url, (menuItem['type'] == "external") ? [Validators.required, StringUtils.urlValidator()] : []),
			isFeatured: this._fb.control(menuItem.isFeatured),
			parentItemId: this._fb.control(menuItem['parentItemId'])
		});
		this.isChild = isChild;
		if(this.isChild) {
			this.index = this.getActiveRootItem(this.activeRootMenuId).items.findIndex(value => value._id === menuItem['_id']);
		} else {
			this.index = this.rootMenuItems.findIndex(value => value._id === menuItem['_id']);
		}
		this.addValidatorForUrlOrRoute();
		this.menuItemsModalOpen('Edit Menu Item', 'Save Changes');
	}

	public confirmDeleteMenuItem(id: string, isChild: boolean = false) {
		this.selectedMenuItem = id;
		this.isChild = isChild;
		this.confirmModalOpen();
	}

	private confirmModalOpen() {
    this.deleteModal.cancelButton = true;
    this.deleteModal.okButton = true;
    this.deleteModal.alertTitle = 'Delete Confirmation';
    this.deleteModal.message = 'Are you sure you want to delete this menu item?';
    this.deleteModal.okButtonText = 'Yes';
    this.deleteModal.open();
  }

	public confirmedDeleteMenuItem(data: any, isChild: boolean = false) {
		this.showLoading = true;
		this.subscriptions.push(
			this._helpContentService.deleteMenuItem(this.selectedMenuItem, this.portal).subscribe(
				_ => {
					this.deleteMenuItemFromArray(this.selectedMenuItem, this.isChild);
					UIkit.notification('Menu item have been <b>successfully deleted</b>', {
						status: 'success',
						timeout: 6000,
						pos: 'bottom-right'
					});
					this.showLoading = false;
				},
				error => this.handleError("Server error deleting menu item", error)
			)
		)
	}

	private deleteMenuItemFromArray(id: string, isChild: boolean = false) {
		if(isChild) {
			let i = this.getActiveRootItem(this.activeRootMenuId).items.findIndex(_ => _._id == id);
			this.getActiveRootItem(this.activeRootMenuId).items.splice(i, 1);
		} else {
			let i = this.rootMenuItems.findIndex(_ => _._id == id);
			this.rootMenuItems.splice(i, 1);
			this.changeActiveRootMenuItem(this.rootMenuItems[0]);
		}
		if(this.menuRouteStatus != null) {
			this.menuRouteStatus.delete(id);
		}
		this.applyFilters();
	}

	private menuItemsModalOpen(title: string, yesBtn: string) {
		this.editModal.cancelButton = true;
		this.editModal.okButton = true;
		this.editModal.okButtonLeft = false;
		this.editModal.alertTitle = title;
		this.editModal.okButtonText = yesBtn;
		this.editModal.open();
	}

	public menuItemSaveConfirmed(data: any) {
		this.destroyTypeSubscription();
		this.showLoading = true;
		if(!this.menuItemForm.value._id) {
			this.subscriptions.push(
				this._helpContentService.saveMenuItem(<MenuItem>this.menuItemForm.value, this.portal).subscribe(
					menuItem => {
						this.menuItemSavedSuccessfully(menuItem, true);
          	UIkit.notification('Menu item <b>' + menuItem.title + '</b> has been <b>successfully created</b>', {
            status: 'success',
            timeout: 6000,
            pos: 'bottom-right'
          });
					},
					error => this.handleError("System error creating menu item", error)
				)
			)
		} else {
			this.subscriptions.push(
				this._helpContentService.updateMenuItem(<MenuItem>this.menuItemForm.value, this.portal).subscribe(
					menuItem => {
						this.menuItemSavedSuccessfully(menuItem, false);
          	UIkit.notification('Menu item <b>' + menuItem.title + '</b> has been <b>successfully updated</b>', {
            status: 'success',
            timeout: 6000,
            pos: 'bottom-right'
          });
					},
					error => this.handleError("System error updating menu item", error)
				)
			)
		}
	}

	public menuItemSavedSuccessfully(menuItem: MenuItem, isNew: boolean) {
		if(isNew) {
			if(this.isChild) {
				this.getActiveRootItem(this.activeRootMenuId).items.push(menuItem);
			} else {
				this.rootMenuItems.push(menuItem);
			}
		} else {
			if(this.isChild) {
				this.getActiveRootItem(this.activeRootMenuId).items[this.index] = menuItem;
			} else {
				this.rootMenuItems[this.index] = menuItem;
			}
		}
		if(this.menuRouteStatus != null) {
			const found = this.allPages.find(page => page.route == menuItem.route);
			if(found) {
				this.menuRouteStatus.set(menuItem._id, found.isEnabled);
			}
		}
		this.applyFilters();
		this.showLoading = false;
	}

	handleError(message: string, error) {
		UIkit.notification(message, {
			status: 'danger',
			timeout: 6000,
			pos: 'bottom-right'
		});
		console.log('Server responded: ' + error);
		this.showLoading = false;
	}

	public applyFilters() {
		this.childrenMenuItems = this.activeRootMenu.items.filter(item => item.title.toLowerCase().includes(this.searchText) || (item.url||'').toLowerCase().includes(this.searchText) || (item.route||'').toLowerCase().includes(this.searchText));
	}

	public onSearchClose() {
    this.selectedKeyword = this.filterForm.get('keyword').value;
  }
  
  public reset() {
    this.selectedKeyword = null;
    this.searchInputComponent.reset();
  }
}