import { ChangeDetectionStrategy, Component, inject, signal } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { Router } from '@angular/router';
import { A11yModule } from '@angular/cdk/a11y';
import { MatIconModule } from '@angular/material/icon';
import {
  JtGridBulkEvent, JtGridBulkService, JtGridCellDirective, JtGridColumn, JtGridComponent, JtGridRowEvent, RowAction
} from '@jambotron/aria-grid';
import { ApiService } from '../../core/api.service';
import { Contact, errorText } from '../../core/models';
import { DialogService } from '../../ui/dialog.service';
import { ToastService } from '../../ui/toast.service';

/** Address book: grid, add/edit form, write to a contact. */
@Component({
  selector: 'app-contacts',
  imports: [FormsModule, A11yModule, MatIconModule, JtGridComponent, JtGridCellDirective],
  changeDetection: ChangeDetectionStrategy.OnPush,
  template: `
    <section class="glass-panel static p-4 md:p-6" aria-labelledby="contacts-title">
      <div class="flex flex-wrap items-center justify-between gap-3 mb-4">
        <div class="flex items-center gap-3">
          <mat-icon class="text-pink-400">contacts</mat-icon>
          <div>
            <h1 id="contacts-title" class="text-xl font-orbitron font-bold neon-text-secondary">CONTACTS</h1>
            <p class="text-xs text-slate-400 font-mono">{{ contacts().length }} contacts · suggested while you type an address</p>
          </div>
        </div>
        <button type="button" class="cyber-btn px-4 py-2 rounded-lg text-xs font-bold" (click)="edit({ name: '', email: '' })">
          <mat-icon>person_add</mat-icon> ADD CONTACT
        </button>
      </div>

      <jt-grid [rows]="contacts()" [columns]="columns" [trackBy]="byEmail" label="Contacts"
               [emptyMessage]="loading() ? 'Loading…' : 'No contacts yet'" [bulkActions]="bulkActions" (bulkAction)="onBulk($event)"
               [rowActions]="rowActions" (rowAction)="onRow($event)" [rowSubject]="nameOf" [initialSort]="{ key: 'name', direction: 'asc' }">
        <ng-template jtGridCell="name" let-row><span class="font-semibold text-slate-100">{{ row.name || '—' }}</span></ng-template>
        <ng-template jtGridCell="email" let-row><span class="font-mono text-xs text-cyan-300">{{ row.email }}</span></ng-template>
        <ng-template jtGridCell="phone" let-row><span class="font-mono text-xs">{{ row.phone || '' }}</span></ng-template>
        <ng-template jtGridCell="company" let-row>{{ row.company || '' }}</ng-template>
      </jt-grid>
    </section>

    @if (editing(); as c) {
      <div class="fixed inset-0 z-50 flex items-center justify-center p-4 bg-slate-950/80 backdrop-blur-md" (click)="editing.set(null)"
           (keydown.escape)="editing.set(null)">
        <form class="glass-panel static max-w-lg w-full p-6 border-2 !border-cyan-400 shadow-[0_0_50px_rgba(0,240,255,0.4)] space-y-4"
              role="dialog" aria-modal="true" aria-labelledby="contact-form-title" cdkTrapFocus [cdkTrapFocusAutoCapture]="true"
              (click)="$event.stopPropagation()" (ngSubmit)="save()">
          <h2 id="contact-form-title" class="text-lg font-orbitron font-bold text-slate-100">{{ c.id ? 'EDIT CONTACT' : 'NEW CONTACT' }}</h2>
          <div><label class="synth-label" for="c-name">Name</label>
            <input id="c-name" name="name" class="synth-input" [(ngModel)]="c.name" maxlength="255"></div>
          <div><label class="synth-label" for="c-email">Email *</label>
            <input id="c-email" name="email" type="email" class="synth-input" [(ngModel)]="c.email" required maxlength="255"></div>
          <div class="grid grid-cols-1 sm:grid-cols-2 gap-4">
            <div><label class="synth-label" for="c-phone">Phone</label>
              <input id="c-phone" name="phone" class="synth-input" [(ngModel)]="c.phone" maxlength="50"></div>
            <div><label class="synth-label" for="c-company">Company</label>
              <input id="c-company" name="company" class="synth-input" [(ngModel)]="c.company" maxlength="255"></div>
          </div>
          @if (formError()) { <p class="text-sm text-pink-400" role="alert">{{ formError() }}</p> }
          <div class="flex justify-end gap-3">
            <button type="button" class="px-4 py-2 rounded-lg text-xs font-mono text-slate-400 hover:text-slate-200" (click)="editing.set(null)">CANCEL [ESC]</button>
            <button type="submit" class="cyber-btn px-5 py-2 rounded-lg text-xs font-bold">SAVE</button>
          </div>
        </form>
      </div>
    }
  `
})
export class ContactsPage {
  private api = inject(ApiService);
  private bulk = inject(JtGridBulkService);
  private dialogs = inject(DialogService);
  private toasts = inject(ToastService);
  private router = inject(Router);

  readonly contacts = signal<Contact[]>([]);
  readonly loading = signal(true);
  readonly editing = signal<Contact | null>(null);
  readonly formError = signal('');

  readonly columns: JtGridColumn<Contact>[] = [
    { key: 'name', label: 'Name', sort: c => (c.name || '').toLowerCase() },
    { key: 'email', label: 'Email', sort: c => c.email.toLowerCase() },
    { key: 'phone', label: 'Phone', sort: c => c.phone || '' },
    { key: 'company', label: 'Company', sort: c => (c.company || '').toLowerCase() }
  ];
  readonly bulkActions: RowAction[] = [
    { value: 'write', label: 'Write to them', icon: 'edit' },
    { value: 'delete', label: 'Delete', icon: 'delete', danger: true }
  ];
  readonly rowActions = (): RowAction[] => [
    { value: 'write', label: 'Write', icon: 'edit', inline: true },
    { value: 'edit', label: 'Edit', icon: 'manage_accounts', inline: true },
    { value: 'delete', label: 'Delete', icon: 'delete', danger: true }
  ];
  readonly byEmail = (c: Contact) => c.id ?? c.email;
  readonly nameOf = (c: Contact) => c.name || c.email;

  constructor() { this.load(); }

  load(): void {
    this.api.contacts().subscribe({
      next: list => { this.contacts.set(list); this.loading.set(false); },
      error: e => { this.loading.set(false); this.toasts.error(errorText(e)); }
    });
  }

  edit(c: Contact): void {
    this.formError.set('');
    this.editing.set({ ...c });
  }

  save(): void {
    const c = this.editing();
    if (!c) return;
    if (!/^[^@\s]+@[^@\s]+$/.test((c.email || '').trim())) {
      this.formError.set('Enter a valid email');
      return;
    }
    const body = { name: (c.name || '').trim(), email: c.email.trim(), phone: (c.phone || '').trim(), company: (c.company || '').trim() };
    (c.id ? this.api.updateContact(c.id, body) : this.api.addContact(body)).subscribe({
      next: () => { this.editing.set(null); this.toasts.ok(c.id ? 'Contact saved' : 'Contact added'); this.load(); },
      error: e => this.formError.set(errorText(e).includes('duplicate') ? 'This email is already in contacts' : errorText(e))
    });
  }

  onRow(e: JtGridRowEvent<Contact>): void {
    if (e.action === 'write') this.router.navigate(['/compose', { to: e.row.email }]);
    if (e.action === 'edit') this.edit(e.row);
    if (e.action === 'delete') {
      this.dialogs.confirm(`Delete ${this.nameOf(e.row)}?`, 'The contact is removed from the address book.', 'Delete', true)
        .subscribe(ok => ok !== null && this.api.deleteContact(e.row.id!).subscribe({
          next: () => { this.toasts.ok('Contact deleted'); this.load(); },
          error: err => this.toasts.error(errorText(err))
        }));
    }
  }

  onBulk(e: JtGridBulkEvent<Contact>): void {
    if (e.action === 'write') {
      this.router.navigate(['/compose', { to: e.rows.map(c => c.email).join(', ') }]);
      return;
    }
    this.bulk.run({
      rows: e.rows, label: 'Delete', danger: true, confirm: `Delete ${e.rows.length} contacts?`,
      run: c => this.api.deleteContact(c.id!)
    }).subscribe(() => this.load());
  }
}