import {ChangeDetectorRef, Component, OnDestroy, OnInit, ViewChild} from '@angular/core';
import {ActivatedRoute, Router} from '@angular/router';
import {Title} from '@angular/platform-browser';
import {EnvProperties} from '../openaireLibrary/utils/properties/env-properties';
import {Category, Stakeholder, SubCategory, Topic, Visibility} from "../openaireLibrary/monitor/entities/stakeholder";
import {StakeholderService} from "../openaireLibrary/monitor/services/stakeholder.service";
import {HelperFunctions} from "../openaireLibrary/utils/HelperFunctions.class";
import {AlertModal} from "../openaireLibrary/utils/modal/alert";
import {BehaviorSubject, Subject, Subscriber, Subscription} from "rxjs";
import {FormBuilder, FormGroup, Validators} from "@angular/forms";
import {StakeholderUtils} from "../utils/indicator-utils";
import {StringUtils} from "../openaireLibrary/utils/string-utils.class";
import {IDeactivateComponent} from "../openaireLibrary/utils/can-exit.guard";
import {LayoutService} from "../openaireLibrary/dashboard/sharedComponents/sidebar/layout.service";
import {Option} from "../openaireLibrary/sharedComponents/input/input.component";
import {properties} from "../../environments/environment";
import {Session, User} from "../openaireLibrary/login/utils/helper.class";
import {UserManagementService} from "../openaireLibrary/services/user-management.service";
import {TransitionGroupComponent} from "../openaireLibrary/utils/transition-group/transition-group.component";
import {NotificationHandler} from "../openaireLibrary/utils/notification-handler";

declare var UIkit;

@Component({
  selector: 'topic',
  templateUrl: './topic.component.html',
})
export class TopicComponent implements OnInit, OnDestroy, IDeactivateComponent {
  private topicSubscriptions: any[] = [];
  private subscriptions: any[] = [];
  public properties: EnvProperties = properties;
  public stakeholderUtils: StakeholderUtils = new StakeholderUtils();
  public loading: boolean = false;
  public stakeholder: Stakeholder;
  public user: User;
  /**
   * Stakeholder change event
   * */
  public change: Subject<void> = new Subject<void>();
  /**
   * Current topic
   **/
  public topicIndexSubject: BehaviorSubject<number> = new BehaviorSubject<number>(0);
  public topicIndex: number = 0;
  /**
   * Current category
   */
  public categoryIndexSubject: BehaviorSubject<number> = new BehaviorSubject<number>(0);
  public categoryIndex: number = 0;
  /**
   * Current Subcategory
   */
  public subCategoryIndexSubject: BehaviorSubject<number> = new BehaviorSubject<number>(0);
  public subCategoryIndex: number = 0;
  /**
   * Current element and index of topic, category or subcategory to be deleted.
   */
  public form: FormGroup;
  public element: Topic | Category | SubCategory;
  public type: 'topic' | 'category' | 'subcategory' = "topic";
  public index: number = -1;
  
  @ViewChild('deleteModal', {static: true}) deleteModal: AlertModal;
  @ViewChild('editModal', {static: true}) editModal: AlertModal;
  
  @ViewChild("topics") topics: TransitionGroupComponent;
  @ViewChild("categories") categories: TransitionGroupComponent;
  @ViewChild("subCategories") subCategories: TransitionGroupComponent;
  
  public elementChildrenActionOnDelete: string;
  public filters: FormGroup;
  public all: Option = {
    value: 'all',
    label: 'All'
  };
  
  constructor(
    private route: ActivatedRoute,
    private router: Router,
    private title: Title,
    private fb: FormBuilder,
    private stakeholderService: StakeholderService,
    private userManagementService: UserManagementService,
    private layoutService: LayoutService,
    private cdr: ChangeDetectorRef) {
  }
  
  public ngOnInit() {
    let subscription: Subscription;
    this.subscriptions.push(this.topicIndexSubject.asObservable().subscribe(index => {
      this.topicChanged(() => {
        this.topicIndex = index;
      });
    }));
    this.subscriptions.push(this.categoryIndexSubject.asObservable().subscribe(index => {
      this.categoryChanged(() => {
        this.categoryIndex = index;
      });
    }));
    this.subscriptions.push(this.subCategoryIndexSubject.asObservable().subscribe(index => {
      this.subCategoryChanged(() => {
        this.subCategoryIndex = index;
      });
    }));
    this.subscriptions.push(this.route.params.subscribe(params => {
      if (subscription) {
        subscription.unsubscribe();
      }
      subscription = this.stakeholderService.getStakeholderAsObservable().subscribe(stakeholder => {
        if (stakeholder) {
          this.stakeholder = stakeholder;
          if (params['topic']) {
            this.chooseTopic(this.stakeholder.topics.findIndex(topic => topic.alias === params['topic']));
          } else {
            this.chooseTopic(0);
          }
          this.chooseCategory(0);
          this.filters = this.fb.group({
            chartType: this.fb.control('all'),
            status: this.fb.control('all'),
            keyword: this.fb.control('')
          });
          if (this.topicIndex === -1) {
            this.navigateToError();
          } else {
            this.title.setTitle(stakeholder.name + " | Indicators");
          }
        }
      });
      this.topicSubscriptions.push(subscription);
    }));
    this.topicSubscriptions.push(this.userManagementService.getUserInfo().subscribe(user => {
      this.user = user;
    }))
  }
  
  public ngOnDestroy() {
    this.topicSubscriptions.forEach(value => {
      if (value instanceof Subscriber) {
        value.unsubscribe();
      }
    });
    this.subscriptions.forEach(value => {
      if (value instanceof Subscriber) {
        value.unsubscribe();
      }
    });
  }
  
  canExit(): boolean {
    this.topicSubscriptions.forEach(value => {
      if (value instanceof Subscriber) {
        value.unsubscribe();
      }
    });
    this.stakeholderService.setStakeholder(this.stakeholder);
    return true;
  }
  
  hide(element: any) {
    UIkit.dropdown(element).hide();
  }
  
  stakeholderChanged() {
    this.change.next();
  }
  
  public saveElement() {
    if (this.type === "topic") {
      this.saveTopic();
    } else if (this.type === "category") {
      this.saveCategory();
    } else {
      this.saveSubCategory();
    }
  }
  
  public deleteElement() {
    if (this.type === "topic") {
      this.deleteTopic();
    } else if (this.type === "category") {
      this.deleteCategory();
    } else {
      this.deleteSubcategory();
    }
  }
  
  public chooseTopic(topicIndex: number) {
    this.topicIndexSubject.next(topicIndex);
  }
  
  topicChanged(callback: Function, save: boolean = false) {
    if(this.topics && save) {
      this.topics.disable();
    }
    if(this.categories) {
      this.categories.disable();
    }
    if(this.subCategories) {
      this.subCategories.disable();
    }
    if(callback) {
      callback();
    }
    this.cdr.detectChanges();
    if(this.topics && save) {
      this.topics.init();
      this.topics.enable();
    }
    if(this.categories) {
      this.categories.init();
      this.categories.enable();
    }
    if(this.subCategories) {
      this.subCategories.init();
      this.subCategories.enable();
    }
  }
  
  private buildTopic(topic: Topic) {
    let topics = this.stakeholder.topics.filter(element => element._id !== topic._id);
    this.form = this.fb.group({
      _id: this.fb.control(topic._id),
      name: this.fb.control(topic.name, Validators.required),
      description: this.fb.control(topic.description),
      creationDate: this.fb.control(topic.creationDate),
      alias: this.fb.control(topic.alias, [
          Validators.required,
          this.stakeholderUtils.aliasValidator(topics)
        ]
      ),
      visibility: this.fb.control(topic.visibility),
      defaultId: this.fb.control(topic.defaultId),
      categories: this.fb.control(topic.categories),
      icon: this.fb.control(topic.icon)
    });
    this.topicSubscriptions.push(this.form.get('name').valueChanges.subscribe(value => {
      let i = 1;
      value = this.stakeholderUtils.generateAlias(value);
      this.form.controls['alias'].setValue(value);
      while (this.form.get('alias').invalid) {
        this.form.controls['alias'].setValue(value + i);
        i++;
      }
    }));
  }
  
  public editTopicOpen(index = -1) {
    this.index = index;
    this.type = 'topic';
    if (index === -1) {
      this.buildTopic(new Topic(null, null, null, "PUBLIC"));
    } else {
      this.buildTopic(this.stakeholder.topics[index]);
    }
    this.editOpen();
  }
  
  public saveTopic() {
    if (!this.form.invalid) {
      let path = [this.stakeholder._id];
      let callback = (topic: Topic): void => {
        this.topicChanged(() => {
          if (this.index === -1) {
            this.stakeholder.topics.push(topic);
          } else {
            this.stakeholder.topics[this.index] = HelperFunctions.copy(topic);
          }
        }, true);
      };
      if (this.index === -1) {
        this.save('Topic has been successfully created', path, this.form.value, callback);
      } else {
        this.save('Topic has been successfully saved', path, this.form.value, callback);
      }
    }
  }
  
  public changeTopicStatus(index: number, visibility: Visibility) {
    this.type = 'topic';
    let path = [
      this.stakeholder._id,
      this.stakeholder.topics[index]._id
    ];
    this.changeStatus(this.stakeholder.topics[index], path, visibility);
  }
  
  public deleteTopicOpen(index = this.topicIndex, childrenAction: string = null) {
    this.type = 'topic';
    this.index = index;
    this.element = this.stakeholder.topics[this.index];
    this.deleteOpen(childrenAction);
  }
  
  public deleteTopic() {
    let path: string[] = [
      this.stakeholder._id,
      this.stakeholder.topics[this.index]._id
    ];
    let callback = (): void => {
      this.chooseTopic(Math.max(0, this.index - 1));
      this.stakeholder.topics.splice(this.index, 1);
      this.topics.init();
    };
    this.delete('Topic has been successfully be deleted', path, callback, (this.topicIndex === this.index));
  }
  
  public moveTopic(index: number, newIndex: number = index - 1) {
    this.topics.init();
    let path = [this.stakeholder._id];
    let ids = this.stakeholder.topics.map(topic => topic._id);
    HelperFunctions.swap(ids, index, newIndex);
    this.stakeholderService.reorderElements(properties.monitorServiceAPIURL, path, ids).subscribe(() => {
      HelperFunctions.swap(this.stakeholder.topics, index, newIndex);
      if(this.topicIndex === index) {
        this.chooseTopic(newIndex);
      } else if(this.topicIndex === newIndex) {
        this.chooseTopic(index);
      }
    }, error => {
      NotificationHandler.rise(error.error.message)
    });
  }
  
  public chooseCategory(index: number) {
    this.categoryIndexSubject.next(index);
    this.chooseSubcategory(0);
  }
  
  categoryChanged(callback: Function, save: boolean = false) {
    if(this.categories && save) {
      this.categories.disable();
    }
    if(this.subCategories) {
      this.subCategories.disable();
    }
    if(callback) {
      callback();
    }
    this.cdr.detectChanges();
    if(this.categories && save) {
      this.categories.init();
      this.categories.enable();
    }
    if(this.subCategories) {
      this.subCategories.init();
      this.subCategories.enable();
    }
  }
  
  private buildCategory(category: Category) {
    let categories = this.stakeholder.topics[this.topicIndex].categories.filter(element => element._id !== category._id);
    this.form = this.fb.group({
      _id: this.fb.control(category._id),
      name: this.fb.control(category.name, Validators.required),
      description: this.fb.control(category.description),
      creationDate: this.fb.control(category.creationDate),
      alias: this.fb.control(category.alias, [
          Validators.required,
          this.stakeholderUtils.aliasValidator(categories)
        ]
      ),
      visibility: this.fb.control(category.visibility),
      defaultId: this.fb.control(category.defaultId),
      subCategories: this.fb.control(category.subCategories)
    });
    this.topicSubscriptions.push(this.form.get('name').valueChanges.subscribe(value => {
      let i = 1;
      value = this.stakeholderUtils.generateAlias(value);
      this.form.controls['alias'].setValue(value);
      while (this.form.get('alias').invalid) {
        this.form.controls['alias'].setValue(value + i);
        i++;
      }
    }));
  }
  
  public editCategoryOpen(index: number = -1) {
    this.index = index;
    this.type = 'category';
    if (index === -1) {
      this.buildCategory(new Category(null, null, null, "PUBLIC"));
    } else {
      this.buildCategory(this.stakeholder.topics[this.topicIndex].categories[index]);
    }
    this.editOpen();
  }
  
  public saveCategory() {
    if (!this.form.invalid) {
      let path = [this.stakeholder._id, this.stakeholder.topics[this.topicIndex]._id];
      let callback = (category: Category): void => {
        this.categoryChanged(() => {
          if (this.index === -1) {
            this.stakeholder.topics[this.topicIndex].categories.push(category);
            this.categories.init();
          } else {
            this.stakeholder.topics[this.topicIndex].categories[this.index] = HelperFunctions.copy(category);
          }
        }, true);
      };
      if (this.index === -1) {
        this.save('Category has been successfully created', path, this.form.value, callback);
      } else {
        this.save('Category has been successfully saved', path, this.form.value, callback);
      }
    }
  }
  
  public changeCategoryStatus(index: number, visibility: Visibility) {
    this.index = index;
    this.type = 'category';
    let path = [
      this.stakeholder._id,
      this.stakeholder.topics[this.topicIndex]._id,
      this.stakeholder.topics[this.topicIndex].categories[this.index]._id
    ];
    this.changeStatus(this.stakeholder.topics[this.topicIndex].categories[this.index], path, visibility);
  }
  
  public deleteCategoryOpen(index: number, childrenAction: string = null) {
    this.type = 'category';
    this.index = index;
    this.element = this.stakeholder.topics[this.topicIndex].categories[this.index];
    this.deleteOpen(childrenAction);
  }
  
  public deleteCategory() {
    let path: string[] = [
      this.stakeholder._id,
      this.stakeholder.topics[this.topicIndex]._id,
      this.stakeholder.topics[this.topicIndex].categories[this.index]._id
    ];
    let callback = (): void => {
      this.chooseCategory(Math.max(0, this.index - 1));
      this.stakeholder.topics[this.topicIndex].categories.splice(this.index, 1);
      this.categories.init();
    };
    this.delete('Category has been successfully be deleted', path, callback);
  }
  
  public moveCategory(index: number, newIndex: number = index - 1) {
    this.categories.init();
    let path = [this.stakeholder._id, this.stakeholder.topics[this.topicIndex]._id];
    let ids = this.stakeholder.topics[this.topicIndex].categories.map(category => category._id);
    HelperFunctions.swap(ids, index, newIndex);
    this.stakeholderService.reorderElements(properties.monitorServiceAPIURL, path, ids).subscribe(() => {
      HelperFunctions.swap(this.stakeholder.topics[this.topicIndex].categories, index, newIndex);
      if(this.categoryIndex === index) {
        this.chooseCategory(newIndex);
      } else if(this.categoryIndex === newIndex) {
        this.chooseCategory(index);
      }
    }, error => {
      NotificationHandler.rise(error.error.message)
    });
  }
  
  chooseSubcategory(subcategoryIndex: number) {
    this.subCategoryIndexSubject.next(subcategoryIndex);
  }
  
  subCategoryChanged(callback: Function, save: boolean = false) {
    if(this.subCategories && save) {
      this.subCategories.disable();
    }
    if(callback) {
      callback();
    }
    this.cdr.detectChanges();
    if(this.subCategories && save) {
      this.subCategories.init();
      this.subCategories.enable();
    }
  }
  
  private buildSubcategory(subCategory: SubCategory) {
    let subCategories = this.stakeholder.topics[this.topicIndex].categories[this.categoryIndex].subCategories.filter(element => element._id !== subCategory._id);
    this.form = this.fb.group({
      _id: this.fb.control(subCategory._id),
      name: this.fb.control(subCategory.name, Validators.required),
      description: this.fb.control(subCategory.description),
      creationDate: this.fb.control(subCategory.creationDate),
      alias: this.fb.control(subCategory.alias, [
          Validators.required,
          this.stakeholderUtils.aliasValidator(subCategories)
        ]
      ),
      visibility: this.fb.control(subCategory.visibility),
      defaultId: this.fb.control(subCategory.defaultId),
      charts: this.fb.control(subCategory.charts),
      numbers: this.fb.control(subCategory.numbers)
    });
    this.topicSubscriptions.push(this.form.get('name').valueChanges.subscribe(value => {
      let i = 1;
      value = this.stakeholderUtils.generateAlias(value);
      this.form.controls['alias'].setValue(value);
      while (this.form.get('alias').invalid) {
        this.form.controls['alias'].setValue(value + i);
        i++;
      }
    }));
  }
  
  public editSubCategoryOpen(index: number = -1) {
    this.index = index;
    this.type = 'subcategory';
    if (index === -1) {
      this.buildSubcategory(new SubCategory(null, null, null, "PUBLIC"));
    } else {
      this.buildSubcategory(this.stakeholder.topics[this.topicIndex].categories[this.categoryIndex].subCategories[index]);
    }
    this.editOpen();
  }
  
  public saveSubCategory() {
    if (!this.form.invalid) {
      let path: string[] = [
        this.stakeholder._id,
        this.stakeholder.topics[this.topicIndex]._id,
        this.stakeholder.topics[this.topicIndex].categories[this.categoryIndex]._id
      ];
      let callback = (subCategory: SubCategory): void => {
        this.subCategoryChanged(() => {
          if (this.index === -1) {
            this.stakeholder.topics[this.topicIndex].categories[this.categoryIndex].subCategories.push(subCategory);
          } else {
            this.stakeholder.topics[this.topicIndex].categories[this.categoryIndex].subCategories[this.index] = HelperFunctions.copy(subCategory);
          }
        }, true);
      };
      if (this.index === -1) {
        this.save('Subcategory has been successfully created', path, this.form.value, callback);
      } else {
        this.save('Subcategory has been successfully saved', path, this.form.value, callback);
      }
    }
  }
  
  public changeSubcategoryStatus(index: number, visibility: Visibility) {
    this.index = index;
    this.type = 'subcategory';
    let path = [
      this.stakeholder._id,
      this.stakeholder.topics[this.topicIndex]._id,
      this.stakeholder.topics[this.topicIndex].categories[this.categoryIndex]._id,
      this.stakeholder.topics[this.topicIndex].categories[this.categoryIndex].subCategories[this.index]._id
    ];
    this.changeStatus(this.stakeholder.topics[this.topicIndex].categories[this.categoryIndex].subCategories[this.index], path, visibility);
  }
  
  
  public deleteSubcategoryOpen(index, childrenAction: string = null) {
    this.type = 'subcategory';
    this.index = index;
    this.element = this.stakeholder.topics[this.topicIndex].categories[this.categoryIndex].subCategories[this.index];
    this.deleteOpen(childrenAction);
  }
  
  public deleteSubcategory() {
    let path: string[] = [
      this.stakeholder._id,
      this.stakeholder.topics[this.topicIndex]._id,
      this.stakeholder.topics[this.topicIndex].categories[this.categoryIndex]._id,
      this.stakeholder.topics[this.topicIndex].categories[this.categoryIndex].subCategories[this.index]._id
    ];
    let callback = (): void => {
      this.chooseSubcategory(Math.max(0, this.index - 1));
      this.stakeholder.topics[this.topicIndex].categories[this.categoryIndex].subCategories.splice(this.index, 1);
    };
    this.delete('Subcategory has been successfully be deleted', path, callback);
  }
  
  public moveSubCategory(index: number, newIndex: number = index - 1) {
    this.subCategories.init();
    let path = [this.stakeholder._id, this.stakeholder.topics[this.topicIndex]._id, this.stakeholder.topics[this.topicIndex].categories[this.categoryIndex]._id];
    let ids = this.stakeholder.topics[this.topicIndex].categories[this.categoryIndex].subCategories.map(subCategory => subCategory._id);
    HelperFunctions.swap(ids, index, newIndex);
    this.stakeholderService.reorderElements(properties.monitorServiceAPIURL, path, ids).subscribe(() => {
      HelperFunctions.swap(this.stakeholder.topics[this.topicIndex].categories[this.categoryIndex].subCategories, index, newIndex);
      if(this.subCategoryIndex === index) {
        this.chooseSubcategory(newIndex);
      } else if(this.subCategoryIndex === newIndex) {
        this.chooseSubcategory(index);
      }
    }, error => {
      NotificationHandler.rise(error.error.message)
    });
  }
  
  private navigateToError() {
    this.router.navigate([this.properties.errorLink], {queryParams: {'page': this.router.url}});
  }
  
  get isCurator(): boolean {
    return Session.isPortalAdministrator(this.user) || Session.isCurator(this.stakeholder.type, this.user);
  }
  
  private editOpen() {
    this.editModal.cancelButtonText = 'Cancel';
    this.editModal.okButtonLeft = false;
    this.editModal.alertMessage = false;
    if (this.index === -1) {
      this.editModal.alertTitle = 'Create a new ' + this.type;
      this.editModal.okButtonText = 'Create';
    } else {
      this.editModal.alertTitle = 'Edit ' + this.type + '\'s information ';
      this.editModal.okButtonText = 'Save';
    }
		this.editModal.stayOpen = true;
    this.editModal.open();
  }
  
  private deleteOpen(childrenAction: string = null) {
    this.elementChildrenActionOnDelete = null;
    if (childrenAction == "delete") {
      this.elementChildrenActionOnDelete = childrenAction;
    } else if (childrenAction == "disconnect") {
      this.elementChildrenActionOnDelete = childrenAction;
    }
    
    this.deleteModal.alertTitle = 'Delete ' + this.type;
    this.deleteModal.cancelButtonText = 'No';
    this.deleteModal.okButtonText = 'Yes';
    // this.deleteModal.cancelButton = false;
    // this.deleteModal.okButton = false;
		this.deleteModal.stayOpen = true;
    this.deleteModal.open();
  }
  
  private save(message: string, path: string[], saveElement: any, callback: Function, redirect = false) {
		this.loading = true;
    this.topicSubscriptions.push(this.stakeholderService.saveElement(this.properties.monitorServiceAPIURL, saveElement, path).subscribe(saveElement => {
      callback(saveElement);
      this.stakeholderChanged();
			this.loading = false;
			this.editModal.cancel();
      NotificationHandler.rise(message);
      if (redirect) {
        this.router.navigate(['../' + saveElement.alias], {
          relativeTo: this.route
        });
      }
    }, error => {
			this.loading = false;
			this.editModal.cancel();
      NotificationHandler.rise(error.error.message, 'danger');
    }));
  }
  
  private delete(message: string, path: string[], callback: Function, redirect = false) {
		this.loading = true;
    this.topicSubscriptions.push(this.stakeholderService.deleteElement(this.properties.monitorServiceAPIURL, path, this.elementChildrenActionOnDelete).subscribe(() => {
      callback();
      this.stakeholderChanged();
			this.loading = false;
			this.deleteModal.cancel();
      NotificationHandler.rise(message);
      if (redirect) {
        this.back();
      }
    }, error => {
			this.loading = false;
			this.deleteModal.cancel();
      NotificationHandler.rise(error.error.message, 'danger');
    }));
  }
  
  private changeStatus(element: Topic | Category | SubCategory, path: string[], visibility: Visibility) {
    this.topicSubscriptions.push(this.stakeholderService.changeVisibility(this.properties.monitorServiceAPIURL, path, visibility).subscribe(visibility => {
      element.visibility = visibility;
      NotificationHandler.rise(StringUtils.capitalize(this.type) + ' has been <b>successfully changed</b> to ' + element.visibility.toLowerCase());
    }, error => {
      NotificationHandler.rise(error.error.message, 'danger');
    }));
  }
  
  back() {
    this.router.navigate(['../'], {
      relativeTo: this.route
    });
  }
  
  public getPluralTypeName(): string {
    if (this.type == "topic") {
      return "Topics";
    } else if (this.type == "category") {
      return "Categories";
    } else if (this.type == "subcategory") {
      return "Subcategories";
    } else {
      return this.type;
    }
  }
  
  public get isSmallScreen() {
    return this.layoutService.isSmallScreen;
  }
  
  public get open() {
    return this.layoutService.open;
  }
  
  public toggleOpen(event: MouseEvent) {
    event.preventDefault();
    this.layoutService.setOpen(!this.open);
  }
}