import { Component, inject, signal } from '@angular/core';
import { FormControl, FormGroup, ReactiveFormsModule, Validators } from '@angular/forms';
import { ApiClientService, type ApiErrorBody, type ItemDto } from '@boilerplate/api-client';
import { UiPaginationComponent } from '../../shared/ui';

@Component({
  standalone: true,
  imports: [ReactiveFormsModule, UiPaginationComponent],
  template: `
    <form class="ui-toolbar item-toolbar" (ngSubmit)="searchItems()">
      <label class="ui-form-field">
        <span class="ui-label">Suche</span>
        <input class="ui-control" [formControl]="search" placeholder="Item suchen" />
      </label>
      <button class="ui-button ui-button--primary" type="submit">Suchen</button>
    </form>

    @if (error()) {
      <p class="ui-notice ui-notice--error">{{ error() }}</p>
    }

    <section class="ui-grid item-grid">
      @for (item of items(); track item.id) {
        <button class="ui-card ui-card--interactive item-card" type="button" (click)="edit(item)">
          <strong>{{ item.name }}</strong>
          <span class="ui-help-text">{{ item.description || 'Keine Beschreibung' }}</span>
          <small class="ui-meta">{{ item.status }} - Version {{ item.version }}</small>
        </button>
      }
    </section>

    @if (total() > 0) {
      <ui-pagination
        [page]="page()"
        [pageSize]="pageSize"
        [total]="total()"
        (pageChange)="goToPage($event)"
      />
    }

    <form class="ui-card ui-form" [formGroup]="form" (ngSubmit)="save()">
      <h2>{{ selected()?.id ? 'Item bearbeiten' : 'Item erstellen' }}</h2>
      <label class="ui-form-field">
        <span class="ui-label">Name</span>
        <input class="ui-control" formControlName="name" />
      </label>
      <label class="ui-form-field">
        <span class="ui-label">Beschreibung</span>
        <textarea class="ui-control" formControlName="description"></textarea>
      </label>
      <label class="ui-form-field">
        <span class="ui-label">Status</span>
        <select class="ui-control" formControlName="status">
          <option value="draft">Entwurf</option>
          <option value="active">Aktiv</option>
          <option value="archived">Archiviert</option>
        </select>
      </label>
      <div class="ui-actions">
        <button class="ui-button ui-button--primary" type="submit" [disabled]="form.invalid">
          Speichern
        </button>
        @if (selected(); as item) {
          <button class="ui-button ui-button--danger" type="button" (click)="delete(item)">
            Loeschen
          </button>
        }
      </div>
    </form>
  `,
  styles: [
    `
      .item-toolbar,
      .item-grid {
        margin-bottom: var(--space-5);
      }
      .item-card {
        text-align: left;
      }
      @media (min-width: 48rem) {
        .item-grid {
          grid-template-columns: repeat(2, minmax(0, 1fr));
        }
      }
    `,
  ],
})
export class ItemsPageComponent {
  private readonly api = inject(ApiClientService);
  readonly items = signal<ItemDto[]>([]);
  readonly selected = signal<ItemDto | null>(null);
  readonly error = signal('');
  readonly page = signal(1);
  readonly total = signal(0);
  readonly pageSize = 20;
  readonly search = new FormControl('', { nonNullable: true });
  readonly form = new FormGroup({
    name: new FormControl('', {
      nonNullable: true,
      validators: [
        (control) => Validators.required(control),
        (control) => Validators.maxLength(160)(control),
      ],
    }),
    description: new FormControl('', { nonNullable: true }),
    status: new FormControl<ItemDto['status']>('draft', { nonNullable: true }),
  });

  constructor() {
    this.load();
  }

  load(): void {
    this.api
      .items({
        search: this.search.value,
        page: this.page(),
        pageSize: this.pageSize,
      })
      .subscribe((page) => {
        this.items.set(page.items);
        this.page.set(page.page);
        this.total.set(page.total);
      });
  }

  searchItems(): void {
    this.page.set(1);
    this.load();
  }

  goToPage(page: number): void {
    this.page.set(page);
    this.load();
  }

  edit(item: ItemDto): void {
    this.selected.set(item);
    this.form.setValue({
      name: item.name,
      description: item.description ?? '',
      status: item.status,
    });
  }

  save(): void {
    this.error.set('');
    const value = this.form.getRawValue();
    const selected = this.selected();
    const request = selected
      ? this.api.updateItem(selected.id, { ...value, version: selected.version })
      : this.api.createItem(value);
    request.subscribe({
      next: () => {
        this.selected.set(null);
        this.form.reset({ name: '', description: '', status: 'draft' });
        this.load();
      },
      error: (err: { error?: ApiErrorBody }) =>
        this.error.set(err.error?.message ?? 'Speichern fehlgeschlagen.'),
    });
  }

  delete(item: ItemDto): void {
    if (confirm('Item wirklich loeschen?')) {
      this.api.deleteItem(item.id, item.version).subscribe(() => this.load());
    }
  }
}