import { SelectionModel } from '@angular/cdk/collections';
import { Component, EventEmitter, Input, OnDestroy, OnInit, Output, ViewChild } from '@angular/core';
import { MatSelectChange } from '@angular/material/select';
import { MatTable } from '@angular/material/table';
import { Observable, Subject } from 'rxjs';
import { takeUntil } from 'rxjs/operators';
import { IamMembersDataSource } from 'src/app/pages/iam/iam-members/iam-members-datasource';
import { OrgMembersDataSource } from 'src/app/pages/orgs/org-members/org-members-datasource';
import {
  ProjectGrantMembersDataSource,
} from 'src/app/pages/projects/owned-projects/project-grant-detail/project-grant-members-datasource';
import { Member } from 'src/app/proto/generated/zitadel/member_pb';

import { PageEvent, PaginatorComponent } from '../paginator/paginator.component';
import { ProjectMembersDataSource } from '../project-members/project-members-datasource';

type MemberDatasource = OrgMembersDataSource | ProjectMembersDataSource | ProjectGrantMembersDataSource | IamMembersDataSource;

@Component({
  selector: 'cnsl-members-table',
  templateUrl: './members-table.component.html',
  styleUrls: ['./members-table.component.scss'],
})
export class MembersTableComponent implements OnInit, OnDestroy {
  public INITIALPAGESIZE: number = 25;
  @Input() public canDelete: boolean | null = false;
  @Input() public canWrite: boolean | null = false;
  @ViewChild(PaginatorComponent) public paginator!: PaginatorComponent;
  @ViewChild(MatTable) public table!: MatTable<Member.AsObject>;
  @Input() public dataSource!: MemberDatasource;
  public selection: SelectionModel<any> = new SelectionModel<any>(true, []);
  @Input() public memberRoleOptions: string[] = [];
  @Input() public factoryLoadFunc!: Function;
  @Input() public refreshTrigger!: Observable<void>;
  @Output() public updateRoles: EventEmitter<{ member: Member.AsObject, change: MatSelectChange; }> = new EventEmitter();
  @Output() public changedSelection: EventEmitter<any[]> = new EventEmitter();
  @Output() public deleteMember: EventEmitter<Member.AsObject> = new EventEmitter();

  private destroyed: Subject<void> = new Subject();

  /** Columns displayed in the table. Columns IDs can be added, removed, or reordered. */
  public displayedColumns: string[] = ['select', 'userId', 'firstname', 'lastname', 'loginname', 'email', 'roles'];

  constructor() {
    this.selection.changed.pipe(takeUntil(this.destroyed)).subscribe(_ => {
      this.changedSelection.emit(this.selection.selected);
    });
  }

  public ngOnInit(): void {
    this.refreshTrigger.pipe(takeUntil(this.destroyed)).subscribe(() => {
      this.changePage(this.paginator);
    });

    if (this.canDelete) {
      this.displayedColumns.push('actions');
    }
  }

  public ngOnDestroy(): void {
    this.destroyed.next();
  }

  public isAllSelected(): boolean {
    const numSelected = this.selection.selected.length;
    const numRows = this.dataSource.membersSubject.value.length;
    return numSelected === numRows;
  }

  public masterToggle(): void {
    this.isAllSelected() ?
      this.selection.clear() :
      this.dataSource.membersSubject.value.forEach(row => this.selection.select(row));
  }

  public changePage(event?: PageEvent): any {
    this.selection.clear();
    return this.factoryLoadFunc(event ?? this.paginator);
  }

  public triggerDeleteMember(member: any): void {
    this.deleteMember.emit(member);
  }
}