import {
  ChangeDetectionStrategy,
  Component,
  computed,
  inject,
  OnInit,
  signal,
  TemplateRef,
  viewChild,
} from '@angular/core';
import {
  form,
  FormField,
  maxLength,
  pattern,
  required,
} from '@angular/forms/signals';
import {
  PiActionButtonComponent,
  PiEmptyStateComponent,
  PiLabelDirective,
  PiSkeletonComponent,
  PiTextareaComponent,
  PiTextFieldComponent,
} from '@pi/ui';
import { DrawerService } from '@task-stream/web/shared/ui';
import { ProjectsFacade } from '@task-stream/web/tracker/application';
import { AuthFacade } from '@task-stream/web/identity/application';
import { GoToComponent } from '../ui/go-to';
import { ProjectCardComponent } from '../ui/project-card';
import { MyWorkComponent } from './my-work';

@Component({
  selector: 'ts-projects-page',
  changeDetection: ChangeDetectionStrategy.OnPush,
  imports: [
    FormField,
    GoToComponent,
    ProjectCardComponent,
    MyWorkComponent,
    PiActionButtonComponent,
    PiEmptyStateComponent,
    PiSkeletonComponent,
    PiTextFieldComponent,
    PiTextareaComponent,
    PiLabelDirective,
  ],
  template: `
    <header class="ts-page-header">
      <div>
        <p class="ts-eyebrow">Pireon · TaskStream</p>
        <h1>
          Hola,
          <span class="ts-gradient-text">{{ firstName() }}</span>
        </h1>
        <p>Lo tuyo en todos tus proyectos, al día en tiempo real.</p>
      </div>
      <div class="ts-home-actions">
        <ts-go-to />
        <pi-action-button
          color="primary"
          text="Nuevo proyecto"
          (execute)="openCreate()"
        />
      </div>
    </header>

    @if (facade.projects().length) {
      <ts-my-work />
      <div class="ts-section-header">
        <h2>
          Proyectos
          <span class="ts-mono ts-muted">{{
            pad(facade.projects().length)
          }}</span>
        </h2>
      </div>
    }

    @if (facade.loading() && !facade.projects().length) {
      <div class="ts-projects">
        @for (i of [1, 2, 3]; track i) {
          <pi-skeleton shape="block" height="12rem" />
        }
      </div>
    } @else if (!facade.projects().length) {
      <pi-empty-state
        icon="kanban"
        title="Aún no tienes proyectos"
        description="Crea uno o pide que te añadan a un proyecto existente."
      >
        <pi-action-button
          color="primary"
          text="Crear el primero"
          (execute)="openCreate()"
        />
      </pi-empty-state>
    } @else {
      <div class="ts-projects">
        @for (project of facade.sorted(); track project.id) {
          <ts-project-card [project]="project" />
        }
      </div>
    }

    <ng-template #createForm>
      <form
        class="ts-form"
        (submit)="$event.preventDefault(); create()"
        novalidate
      >
        <pi-text-field [formField]="f.key" placeholder="TS">
          <pi-label [isRequired]="true"
            >Clave (prefijo de los tickets)</pi-label
          >
        </pi-text-field>
        <pi-text-field [formField]="f.name" placeholder="Checkout revamp">
          <pi-label [isRequired]="true">Nombre</pi-label>
        </pi-text-field>
        <pi-textarea
          [formField]="f.description"
          placeholder="¿De qué va el proyecto?"
        >
          <pi-label>Descripción</pi-label>
        </pi-textarea>
        <label class="ts-public-check">
          <input type="checkbox" [formField]="f.isPublic" />
          <span>
            <strong>Proyecto público</strong>
            Cualquiera, también sin iniciar sesión, podrá verlo (solo lectura).
            Se puede cambiar después en Configuración.
          </span>
        </label>
        <pi-action-button
          size="w100"
          color="primary"
          [text]="facade.creating() ? 'Creando…' : 'Crear proyecto'"
          [disabled]="f().invalid() || facade.creating()"
          (execute)="create()"
        />
      </form>
    </ng-template>
  `,
  styles: `
    .ts-home-actions {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      flex-wrap: wrap;
      @media (max-width: 640px) {
        width: 100%;
        ts-go-to {
          flex: 1;
        }
      }
    }
    .ts-section-header h2 {
      display: flex;
      align-items: baseline;
      gap: 0.625rem;
      .ts-mono {
        font-size: 0.875rem;
        font-weight: 400;
      }
    }
    .ts-public-check {
      display: flex;
      align-items: flex-start;
      gap: 0.625rem;
      font-size: 0.8125rem;
      color: var(--ts-muted);
      cursor: pointer;
      input {
        width: 1rem;
        height: 1rem;
        margin-top: 0.125rem;
        accent-color: var(--ts-brand);
      }
      strong {
        display: block;
        color: var(--ts-ink);
        font-size: 0.875rem;
      }
    }
    .ts-projects {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(min(100%, 20rem), 1fr));
      gap: 1.25rem;
    }
  `,
})
export class ProjectsPage implements OnInit {
  protected readonly facade = inject(ProjectsFacade);
  private readonly auth = inject(AuthFacade);
  protected readonly firstName = computed(
    () => this.auth.user()?.name.split(/\s+/)[0] ?? '',
  );
  private readonly drawer = inject(DrawerService);
  private readonly createForm =
    viewChild.required<TemplateRef<unknown>>('createForm');

  private readonly model = signal({
    key: '',
    name: '',
    description: '',
    isPublic: false,
  });
  protected readonly f = form(this.model, (p) => {
    required(p.key);
    pattern(p.key, /^[A-Za-z][A-Za-z0-9]{1,9}$/, {
      message: '2-10 letras/números, empezando por letra',
    });
    required(p.name);
    maxLength(p.name, 120);
  });

  protected readonly pad = (n: number) => String(n).padStart(2, '0');

  ngOnInit(): void {
    this.facade.load();
  }

  protected openCreate(): void {
    this.model.set({ key: '', name: '', description: '', isPublic: false });
    this.drawer.open('Nuevo proyecto', this.createForm());
  }

  protected create(): void {
    if (this.f().invalid()) return;
    const { key, name, description, isPublic } = this.model();
    this.facade.create({
      key: key.toUpperCase(),
      name,
      description: description || null,
      isPublic,
    });
    this.drawer.closeAll();
  }
}