import { AfterViewInit, Component, ElementRef, OnInit, ViewChild } from '@angular/core';
import { FormArray, FormBuilder, FormControl, FormGroup } from '@angular/forms';
import { MatAutocompleteSelectedEvent } from '@angular/material/autocomplete';
import { MatDialog } from '@angular/material/dialog';
import { ActivatedRoute, Router } from '@angular/router';
import * as moment from 'moment';
import { BehaviorSubject, Observable, of as observableOf } from 'rxjs';
import { debounceTime, distinctUntilChanged, map, startWith, switchMap } from 'rxjs/operators';

import { AttendanceType } from '../attendance/attendance-type';
import { AuthService } from '../auth/auth.service';
import { ToasterService } from '../core/toaster.service';
import { Employee } from '../employee/employee';
import { EmployeeService } from '../employee/employee.service';

import { EmployeeAttendance } from './employee-attendance';
import { EmployeeAttendanceDataSource } from './employee-attendance-datasource';
import { EmployeeAttendanceItem } from './employee-attendance-item';
import { EmployeeAttendanceService } from './employee-attendance.service';

@Component({
  selector: 'app-employee-attendance',
  templateUrl: './employee-attendance.component.html',
  styleUrls: ['./employee-attendance.component.css'],
})
export class EmployeeAttendanceComponent implements OnInit, AfterViewInit {
  @ViewChild('employeeElement', { static: true }) employeeElement?: ElementRef;
  public employeeAttendanceObservable = new BehaviorSubject<EmployeeAttendanceItem[]>([]);
  dataSource: EmployeeAttendanceDataSource = new EmployeeAttendanceDataSource(
    this.employeeAttendanceObservable,
  );

  form: FormGroup;

  info: EmployeeAttendance = new EmployeeAttendance();
  attendanceTypes: AttendanceType[] = [];

  displayedColumns = ['date', 'status', 'prints'];

  employees: Observable<Employee[]>;

  constructor(
    private route: ActivatedRoute,
    private router: Router,
    private fb: FormBuilder,
    private dialog: MatDialog,
    private toaster: ToasterService,
    private auth: AuthService,
    private ser: EmployeeAttendanceService,
    private employeeSer: EmployeeService,
  ) {
    this.form = this.fb.group({
      startDate: '',
      finishDate: '',
      employee: '',
      attendances: this.fb.array([]),
    });
    // Listen to Employee Value Changes
    this.employees = (this.form.get('employee') as FormControl).valueChanges.pipe(
      startWith(null),
      map((x) => (x !== null && x.length >= 1 ? x : null)),
      debounceTime(150),
      distinctUntilChanged(),
      switchMap((x) => (x === null ? observableOf([]) : this.employeeSer.autocomplete(x))),
    );
  }

  ngOnInit() {
    this.route.data.subscribe((value) => {
      const data = value as { info: EmployeeAttendance; attendanceTypes: AttendanceType[] };

      this.info = data.info;
      this.attendanceTypes = data.attendanceTypes;
      (this.form.get('startDate') as FormControl).setValue(
        moment(this.info.startDate, 'DD-MMM-YYYY').toDate(),
      );
      (this.form.get('finishDate') as FormControl).setValue(
        moment(this.info.finishDate, 'DD-MMM-YYYY').toDate(),
      );
      (this.form.get('employee') as FormControl).setValue(this.info.employee);
      this.form.setControl(
        'attendances',
        this.fb.array(
          this.info.body.map((x) =>
            this.fb.group({
              attendanceType: x.attendanceType.id,
            }),
          ),
        ),
      );
      this.dataSource = new EmployeeAttendanceDataSource(this.employeeAttendanceObservable);
      this.employeeAttendanceObservable.next(this.info.body);
    });
  }

  ngAfterViewInit() {
    setTimeout(() => {
      if (this.employeeElement) {
        this.employeeElement.nativeElement.focus();
      }
    }, 0);
  }

  displayFn(employee?: Employee): string {
    return employee ? employee.name : '';
  }

  selected(event: MatAutocompleteSelectedEvent): void {
    this.info.employee = event.option.value;
  }

  getClass(index: number) {
    const array = this.form.get('attendances') as FormArray;
    const id = array.controls[index].value.attendanceType;
    const { name } = this.attendanceTypes.filter((x) => x.id === id)[0];
    return name.toLowerCase().replace(/(\s+\+\s+)|(\s+)/g, '-');
  }

  show() {
    const formValue = this.form.value;
    this.info.startDate = moment(formValue.startDate).format('DD-MMM-YYYY');
    this.info.finishDate = moment(formValue.finishDate).format('DD-MMM-YYYY');
    this.router.navigate(['/employee-attendance', this.info.employee.id], {
      queryParams: {
        startDate: this.info.startDate,
        finishDate: this.info.finishDate,
      },
    });
  }

  save() {
    this.ser.save(this.getEmployeeAttendance()).subscribe(
      () => {
        this.toaster.show('Success', '');
      },
      (error) => {
        this.toaster.show('Danger', error);
      },
    );
  }

  getEmployeeAttendance(): EmployeeAttendance {
    const formValue = this.form.value;
    this.info.startDate = moment(formValue.startDate).format('DD-MMM-YYYY');
    this.info.finishDate = moment(formValue.finishDate).format('DD-MMM-YYYY');
    const array = this.form.get('attendances') as FormArray;
    this.info.body.forEach((item, index) => {
      item.attendanceType.id = array.controls[index].value.attendanceType;
    });
    return this.info;
  }

  get attendancesArray(): FormArray {
    return this.form.get('attendances') as FormArray;
  }
}