display-edit.component.ts

import { animate, state, style, transition, trigger } from '@angular/animations';
import { Component, EventEmitter, Inject, Input, OnInit, Output, ViewChild } from '@angular/core';
import { MatDialog } from '@angular/material/dialog';
import {
    ApiResponseError,
    Constants,
    DeleteValue,
    DeleteValueResponse,
    KnoraApiConnection,
    PermissionUtil,
    ReadLinkValue,
    ReadResource,
    ReadUser,
    ReadValue,
    ResourcePropertyDefinition,
    UpdateResource,
    UpdateValue,
    WriteValueResponse
} from '@dasch-swiss/dsp-js';
import { mergeMap } from 'rxjs/operators';
import { DspApiConnectionToken } from 'src/app/main/declarations/dsp-api-tokens';
import { BaseValueDirective } from 'src/app/main/directive/base-value.directive';
import {
    ConfirmationDialogComponent,
    ConfirmationDialogData,
    ConfirmationDialogValueDeletionPayload
} from '../../../../main/action/confirmation-dialog/confirmation-dialog.component';
import { PropertyInfoValues } from '../../properties/properties.component';
import { UserService } from '../../services/user.service';
import {
    DeletedEventValue,
    EmitEvent,
    Events,
    UpdatedEventValues,
    ValueOperationEventService
} from '../../services/value-operation-event.service';
import { ValueService } from '../../services/value.service';

@Component({
    selector: 'app-display-edit',
    templateUrl: './display-edit.component.html',
    styleUrls: ['./display-edit.component.scss'],
    animations: [
        // the fade-in/fade-out animation.
        // https://www.kdechant.com/blog/angular-animations-fade-in-and-fade-out
        trigger('simpleFadeAnimation', [

            // the "in" style determines the "resting" state of the element when it is visible.
            state('in', style({ opacity: 1 })),

            // fade in when created.
            transition(':enter', [
            // the styles start from this point when the element appears
                style({ opacity: 0 }),
                // and animate toward the "in" state above
                animate(150)
            ]),

            // fade out when destroyed.
            transition(':leave',
            // fading out uses a different syntax, with the "style" being passed into animate()
                animate(150, style({ opacity: 0 })))
        ])
    ]
})
export class DisplayEditComponent implements OnInit {

    @ViewChild('displayVal') displayValueComponent: BaseValueDirective;

    @Input() displayValue: ReadValue;

    @Input() propArray: PropertyInfoValues[];

    @Input() parentResource: ReadResource;

    @Input() configuration?: object;

    @Input() canDelete: boolean;

    @Output() referredResourceClicked: EventEmitter<ReadLinkValue> = new EventEmitter<ReadLinkValue>();

    @Output() referredResourceHovered: EventEmitter<ReadLinkValue> = new EventEmitter<ReadLinkValue>();

    constants = Constants;

    mode: 'read' | 'update' | 'create' | 'search';

    canModify: boolean;

    editModeActive = false;

    shouldShowCommentToggle: boolean;

    // type of given displayValue
    // or knora-api-js-lib class representing the value
    valueTypeOrClass: string;

    // indicates if value can be edited
    readOnlyValue: boolean;

    // indicates if the action bubble with the CRUD buttons should be shown
    showActionBubble = false;

    // string used as class name to add add to value-component element on hover
    backgroundColor = '';

    dateDisplayOptions: 'era' | 'calendar' | 'all';

    showDateLabels = false;

    textArea = false;

    dateFormat: string;

    user: ReadUser;

    constructor(
        @Inject(DspApiConnectionToken) private _dspApiConnection: KnoraApiConnection,
        private _valueOperationEventService: ValueOperationEventService,
        private _dialog: MatDialog,
        private _userService: UserService,
        private _valueService: ValueService) {
    }

    ngOnInit() {

        this.mode = 'read';
        this.dateDisplayOptions = 'all';
        this.showDateLabels = true;
        this.dateFormat = 'dd.MM.YYYY';

        // determine if user has modify permissions
        const allPermissions = PermissionUtil.allUserPermissions(this.displayValue.userHasPermission as 'RV' | 'V' | 'M' | 'D' | 'CR');

        this.canModify = allPermissions.indexOf(PermissionUtil.Permissions.M) !== -1;

        // check if comment toggle button should be shown
        this.checkCommentToggleVisibility();

        this.valueTypeOrClass = this._valueService.getValueTypeOrClass(this.displayValue);

        // get the resource property definition
        const resPropDef = this.parentResource.entityInfo.getPropertyDefinitionsByType(ResourcePropertyDefinition).filter(
            (propDef: ResourcePropertyDefinition) => propDef.id === this.displayValue.property
        );

        if(resPropDef[0].guiElement === Constants.SalsahGui + Constants.HashDelimiter + 'Textarea') {
            this.textArea = true;
        }

        if (resPropDef.length !== 1) {
            // this should never happen because we always have the property info for the given value
            throw new Error('Resource Property Definition could not be found: ' + this.displayValue.property);
        }

        this.readOnlyValue = this._valueService.isReadOnly(this.valueTypeOrClass, this.displayValue, resPropDef[0]);

        // prevent getting info about system user (standoff link values are managed by the system)
        if (this.displayValue.attachedToUser !== 'http://www.knora.org/ontology/knora-admin#SystemUser') {
            this._userService.getUser(this.displayValue.attachedToUser).subscribe(
                user => {
                    this.user = user.user;
                }
            );
        }
    }

    getTooltipText(): string {
        const creationDate = 'Creation date: ' + this.displayValue.valueCreationDate;

        const creatorInfo = this.user ? '\n Value creator: ' + this.user?.givenName + ' ' + this.user?.familyName : '';

        return creationDate + creatorInfo;
    }

    /**
     * react when a standoff link in a text has received a click event.
     *
     * @param resIri the Iri of the resource the standoff link refers to.
     */
    standoffLinkClicked(resIri: string): void {

        // find the corresponding standoff link value
        const referredResStandoffLinkVal: ReadLinkValue[] = this._getStandoffLinkValueForResource(resIri);

        // only emit an event if the corresponding standoff link value could be found
        if (referredResStandoffLinkVal.length === 1) {
            this.referredResourceClicked.emit(referredResStandoffLinkVal[0]);
        }
    }

    /**
     * react when a standoff link in a text has received a hover event.
     *
     * @param resIri the Iri of the resource the standoff link refers to.
     */
    standoffLinkHovered(resIri: string): void {

        // find the corresponding standoff link value
        const referredResStandoffLinkVal: ReadLinkValue[] = this._getStandoffLinkValueForResource(resIri);

        // only emit an event if the corresponding standoff link value could be found
        if (referredResStandoffLinkVal.length === 1) {
            this.referredResourceHovered.emit(referredResStandoffLinkVal[0]);
        }

    }

    /**
     * show the form components and CRUD buttons to update an existing value or add a new value.
     */
    activateEditMode() {
        this.editModeActive = true;
        this.backgroundColor = '';
        this.mode = 'update';

        // hide comment toggle button while in edit mode
        this.checkCommentToggleVisibility();

        // hide read mode comment when switching to edit mode
        this.displayValueComponent.shouldShowComment = false;
    }

    /**
     * save a new version of an existing property value.
     */
    saveEditValue() {
        this.editModeActive = false;
        this.showActionBubble = false;
        const updatedVal = this.displayValueComponent.getUpdatedValue();

        if (updatedVal instanceof UpdateValue) {
            const updateRes = new UpdateResource();
            updateRes.id = this.parentResource.id;
            updateRes.type = this.parentResource.type;
            updateRes.property = this.displayValue.property;
            updateRes.value = updatedVal;
            this._dspApiConnection.v2.values.updateValue(updateRes as UpdateResource<UpdateValue>).pipe(
                mergeMap((res: WriteValueResponse) => this._dspApiConnection.v2.values.getValue(this.parentResource.id, res.uuid))
            ).subscribe(
                (res2: ReadResource) => {

                    this._valueOperationEventService.emit(
                        new EmitEvent(Events.ValueUpdated, new UpdatedEventValues(
                            this.displayValue, res2.getValues(this.displayValue.property)[0])));

                    this.displayValue = res2.getValues(this.displayValue.property)[0];
                    this.mode = 'read';

                    // hide comment once back in read mode
                    this.displayValueComponent.updateCommentVisibility();

                    // check if comment toggle button should be shown
                    this.checkCommentToggleVisibility();
                },
                (error: ApiResponseError) => {
                    // error handling
                    this.editModeActive = true;
                    switch (error.status) {
                        case 400:
                            this.displayValueComponent.valueFormControl.setErrors({ duplicateValue: true });
                            break;
                        default:
                            console.log('There was an error processing your request. Details: ', error);
                            break;

                    }
                }
            );

        } else {
            console.error('invalid value');
        }
    }

    /**
     * open a confirmation dialog box to ensure the user would like to complete the action.
     */
    openDialog() {
        const dialogData = new ConfirmationDialogData();
        dialogData.value = this.displayValue;
        dialogData.buttonTextOk = 'Yes, delete the value';
        dialogData.buttonTextCancel = 'No, keep the value';

        const dialogRef =
            this._dialog.open<ConfirmationDialogComponent, ConfirmationDialogData>(ConfirmationDialogComponent, { data: dialogData });

        dialogRef.afterClosed().subscribe((payload: ConfirmationDialogValueDeletionPayload) => {
            if (payload && payload.confirmed) {
                this.deleteValue(payload.deletionComment);
            }
        });
    }

    /**
     * delete a value from a property.
     * Emits an event that can be listened to.
     */
    deleteValue(comment?: string) {
        const deleteVal = new DeleteValue();
        deleteVal.id = this.displayValue.id;
        deleteVal.type = this.displayValue.type;
        deleteVal.deleteComment = comment;

        const updateRes = new UpdateResource();
        updateRes.type = this.parentResource.type;
        updateRes.id = this.parentResource.id;
        updateRes.property = this.displayValue.property;
        updateRes.value = deleteVal;

        this._dspApiConnection.v2.values.deleteValue(updateRes as UpdateResource<DeleteValue>).pipe(
            mergeMap((res: DeleteValueResponse) => {
            // emit a ValueDeleted event to the listeners in resource-view component to trigger an update of the UI
                this._valueOperationEventService.emit(new EmitEvent(Events.ValueDeleted, new DeletedEventValue(deleteVal)));
                return res.result;
            })).subscribe();
    }

    /**
     * hide the form components and CRUD buttons and show the value in read mode.
     */
    cancelEditValue() {
        this.editModeActive = false;
        this.showActionBubble = false;
        this.mode = 'read';

        // hide comment once back in read mode
        this.displayValueComponent.updateCommentVisibility();

        // check if comment toggle button should be shown
        this.checkCommentToggleVisibility();
    }

    /**
     * show or hide the comment.
     */
    toggleComment() {
        this.displayValueComponent.toggleCommentVisibility();
    }

    /**
     * check if the comment toggle button should be shown.
     * Only show the comment toggle button if user is in READ mode and a comment exists for the value.
     */
    checkCommentToggleVisibility() {
        this.shouldShowCommentToggle = (
            this.mode === 'read' &&
            this.displayValue.valueHasComment !== '' &&
            this.displayValue.valueHasComment !== undefined
        );
    }

    /**
     * show CRUD buttons and add 'highlighted' class to the element only if editModeActive is false
     */
    mouseEnter() {
        this.showActionBubble = true;
        if (!this.editModeActive) {
            this.backgroundColor = 'highlighted';
        }
    }

    /**
     * hide CRUD buttons and remove the 'hightlighted' class from the element
     */
    mouseLeave() {
        this.showActionBubble = false;
        this.backgroundColor = '';
    }

    /**
     * given a resource Iri, finds the corresponding standoff link value.
     * Returns an empty array if the standoff link cannot be found.
     *
     * @param resIri the Iri of the resource.
     */
    private _getStandoffLinkValueForResource(resIri: string): ReadLinkValue[] {

        // find the PropertyInfoValues for the standoff link value
        const standoffLinkPropInfoVals: PropertyInfoValues[] = this.propArray.filter(
            resPropInfoVal => resPropInfoVal.propDef.id === Constants.HasStandoffLinkToValue
        );

        if (standoffLinkPropInfoVals.length === 1) {

            // find the corresponding standoff link value
            const referredResStandoffLinkVal: ReadValue[] = standoffLinkPropInfoVals[0].values.filter(
                (standoffLinkVal: ReadValue) => standoffLinkVal instanceof ReadLinkValue
                        && (standoffLinkVal as ReadLinkValue).linkedResourceIri === resIri
            );

            // if no corresponding standoff link value was found,
            // this array is empty
            return referredResStandoffLinkVal as ReadLinkValue[];

        } else {
            // this should actually never happen
            // because all resource types have a cardinality for a standoff link value
            return [];
        }
    }

}