Integrate metadata selection

The search component receives notifications
when the selected repository changes.
Upon such changes, only display the pages to which
the new filter applies.

src/main/webapp/app/search/search.component.ts

-import {Component, OnDestroy, OnInit} from '@angular/core';
-import {Subject, Subscription} from 'rxjs';
-
-import {LoginModalService} from 'app/core/login/login-modal.service';
-import {AccountService} from 'app/core/auth/account.service';
-import {Account} from 'app/core/user/account.model';
-import {HttpResponse} from '@angular/common/http';
-import {ActivatedRoute, Router} from '@angular/router';
-import {QueryParam, QueryParamBuilder, QueryParamGroup} from '@ngqp/core';
-import {takeUntil} from 'rxjs/operators';
-import {IFrequency} from 'app/shared/model/frequency.model';
-import {IGitFilesPageDetails} from 'app/shared/model/git-files-page-details.model';
-import {IGitFilesAggregation} from 'app/shared/model/git-files-aggregation';
-import {IGitFiles} from 'app/shared/model/git-files.model';
-import {SearchInput} from "app/shared/model/search-input.model";
-import {SearchResultService} from "app/search/search/search-result.service";
+import { Component, OnDestroy, OnInit } from '@angular/core';
+import { Subject, Subscription } from 'rxjs';
+
+import { LoginModalService } from 'app/core/login/login-modal.service';
+import { AccountService } from 'app/core/auth/account.service';
+import { Account } from 'app/core/user/account.model';
+import { HttpResponse } from '@angular/common/http';
+import { ActivatedRoute, Router } from '@angular/router';
+import { QueryParam, QueryParamBuilder, QueryParamGroup } from '@ngqp/core';
+import { takeUntil } from 'rxjs/operators';
+import { IFrequency } from 'app/shared/model/frequency.model';
+import { IGitFilesPageDetails, GitFilesPageDetails } from 'app/shared/model/git-files-page-details.model';
+import { IGitFilesAggregation } from 'app/shared/model/git-files-aggregation';
+import { IGitFiles } from 'app/shared/model/git-files.model';
+import { SearchInput } from 'app/shared/model/search-input.model';
+import { SearchResultService } from 'app/search/search/search-result.service';
+import { MessageService } from 'app/search/metadata-message.service';
 
 @Component({
   selector: 'jhi-search',
@@ -26,26 +27,30 @@ export class SearchComponent implements OnInit, OnDestroy {
 
   account: Account | null = null;
   authSubscription?: Subscription;
+  private gitFilesAllPages?: IGitFilesPageDetails;
   gitFilesPageDetails?: IGitFilesPageDetails;
   gitFilesAggregation?: IGitFilesAggregation;
 
+  private selectedFiltersSubscription: Subscription = new Subscription();
+  private selectedRepository: string | null = null;
+  private selectedUniversity: string | null = null;
+  private selectedFileFormat: string | null = null;
 
   public paramGroup: QueryParamGroup;
   private componentDestroyed$ = new Subject<void>();
 
-
   public searchInput: SearchInput;
 
-
   constructor(
     protected searchResultService: SearchResultService,
     private accountService: AccountService,
     private loginModalService: LoginModalService,
     protected activatedRoute: ActivatedRoute,
     private router: Router,
-    private qpb: QueryParamBuilder
+    private qpb: QueryParamBuilder,
+    private filterSelectionService: MessageService
   ) {
-    this.searchInput = new SearchInput()
+    this.searchInput = new SearchInput();
 
     this.paramGroup = qpb.group({
       searchText: qpb.stringParam('q', {
@@ -100,6 +105,9 @@ export class SearchComponent implements OnInit, OnDestroy {
     this.loadAggregation();
     this.loadPageDetails();
     this.authSubscription = this.accountService.getAuthenticationState().subscribe(account => (this.account = account));
+    this.selectedFiltersSubscription.add(
+      this.filterSelectionService.filterSelection$.subscribe(filterSelection => this.updateSearchInfoFilter(filterSelection))
+    );
   }
 
   loadAggregation(): void {
@@ -116,14 +124,44 @@ export class SearchComponent implements OnInit, OnDestroy {
 
   loadPageDetails(): void {
     if (this.searchInput.fulltextQuery) {
-      this.searchResultService
-        .searchPageDetails(this.searchInput, this.pageSize)
-        .subscribe((res: HttpResponse<IGitFilesPageDetails>) => {
-          this.gitFilesPageDetails = res.body || undefined;
-        });
+      this.searchResultService.searchPageDetails(this.searchInput, this.pageSize).subscribe((res: HttpResponse<IGitFilesPageDetails>) => {
+        if (res.body === null) {
+          this.gitFilesAllPages = undefined;
+        } else {
+          this.gitFilesAllPages = new GitFilesPageDetails(res.body.gitFiles, res.body.gitFiles.length);
+          this.updatePageDetails();
+        }
+      });
     }
   }
 
+  private updatePageDetails(): void {
+    if (this.gitFilesAllPages !== undefined) {
+      const matchingResults = this.gitFilesAllPages.gitFiles.filter(element => this.matchesSelection(element));
+      if (matchingResults.length > 0) {
+        this.gitFilesPageDetails = new GitFilesPageDetails(matchingResults, matchingResults.length);
+      } else {
+        this.gitFilesPageDetails = undefined;
+      }
+    }
+  }
+
+  public updateSearchInfoFilter(selectionUpdate: IFrequency<string>): void {
+    if (this.selectedRepository === selectionUpdate.key) {
+      this.selectedRepository = null;
+    } else {
+      this.selectedRepository = selectionUpdate.key;
+    }
+    this.updatePageDetails();
+  }
+
+  matchesSelection(file: IGitFiles): boolean {
+    if (this.selectedRepository) {
+      return file.repository === this.selectedRepository;
+    }
+    return true;
+  }
+
   isAuthenticated(): boolean {
     return this.accountService.isAuthenticated();
   }
@@ -136,6 +174,9 @@ export class SearchComponent implements OnInit, OnDestroy {
     if (this.authSubscription) {
       this.authSubscription.unsubscribe();
     }
+    if (this.selectedFiltersSubscription) {
+      this.selectedFiltersSubscription.unsubscribe();
+    }
     this.componentDestroyed$.next();
     this.componentDestroyed$.complete();
   }
@@ -173,4 +214,3 @@ export class SearchComponent implements OnInit, OnDestroy {
     return hits ? hits : 0;
   }
 }
-