import { Component, inject, afterNextRender, linkedSignal, input, computed } from '@angular/core';
import { form as createForm, FormField, FormRoot } from '@angular/forms/signals';
import { MatButtonModule } from '@angular/material/button';
import { MatFormFieldModule } from '@angular/material/form-field';
import { MatInputModule } from '@angular/material/input';
import { MatSnackBar } from '@angular/material/snack-bar';
import { Router } from '@angular/router';

import { CostCentre } from '../../core/cost-centre';
import { ErrorStateComponent } from '../../shared/error-state/error-state.component';
import { SkeletonLoaderComponent } from '../../shared/skeleton-loader/skeleton-loader.component';
import { CostCentreService } from '../cost-centre.service';

export interface CostCentreDetailFormData {
  name: string;
}

@Component({
  selector: 'app-cost-centre-detail',
  templateUrl: './cost-centre-detail.component.html',
  styleUrls: ['./cost-centre-detail.component.css'],
  imports: [
    FormField,
    FormRoot,
    MatFormFieldModule,
    MatInputModule,
    MatButtonModule,
    SkeletonLoaderComponent,
    ErrorStateComponent,
  ],
})
export class CostCentreDetailComponent {
  id = input(null, { transform: (v: string | null | undefined) => v ?? null });

  private router = inject(Router);
  private snackBar = inject(MatSnackBar);
  private ser = inject(CostCentreService);

  itemResource = this.ser.get(this.id);

  item = computed(() => this.itemResource.value() ?? new CostCentre());

  model = linkedSignal({
    source: this.item,
    computation: (itemVal): CostCentreDetailFormData => ({
      name: itemVal.name ?? '',
    }),
  });

  form = createForm(this.model);

  constructor() {
    afterNextRender(() => {
      this.form().focusBoundControl();
    });
  }

  save() {
    this.ser.saveOrUpdate(this.getItem()).subscribe({
      next: () => {
        this.snackBar.open('', 'Success');
        this.router.navigateByUrl('/cost-centres');
      },
      error: (error) => {
        this.snackBar.open(error as string, 'Danger');
      },
    });
  }

  getItem(): CostCentre {
    const formModel = this.model();
    const item = this.item();
    item.name = formModel.name ?? '';
    return item;
  }
}