import {
  ChangeDetectionStrategy,
  Component,
  inject,
  TemplateRef,
  viewChild,
} from '@angular/core';
import { Router } from '@angular/router';
import {
  PiActionButtonComponent,
  PiBadgeComponent,
  PiIconButtonComponent,
  PiIconComponent,
  PiCheckboxComponent,
} from '@pi/ui';
import { DrawerService } from '@task-stream/web/shared/ui';
import { InboxFacade, PushFacade } from '@task-stream/web/tracker/application';
import {
  Notification,
  NotificationKind,
} from '@task-stream/web/tracker/domain';
import { timeAgo } from './copy';

const ICON: Record<NotificationKind, string> = {
  [NotificationKind.ASSIGNED]: 'user-profile',
  [NotificationKind.STATUS_CHANGED]: 'arrow-forward',
  [NotificationKind.QA_FAILED]: 'exclamation',
  [NotificationKind.COMMENTED]: 'chat',
  [NotificationKind.MENTIONED]: 'chat',
  [NotificationKind.REPLIED]: 'chat',
  [NotificationKind.PROPOSED]: 'light-bulb',
  [NotificationKind.WATCHED]: 'focus',
  [NotificationKind.ADDED_TO_PROJECT]: 'briefcase',
  [NotificationKind.REMINDER]: 'calendar',
};

/**
 * The bell in the header: how many unread, and the list in a side panel.
 * Opening one goes to its ticket (or project) and marks it read.
 */
@Component({
  selector: 'ts-notifications-bell',
  changeDetection: ChangeDetectionStrategy.OnPush,
  imports: [
    PiActionButtonComponent,
    PiBadgeComponent,
    PiIconButtonComponent,
    PiIconComponent,
    PiCheckboxComponent,
  ],
  template: `
    <pi-badge
      [value]="inbox.unread()"
      [max]="99"
      color="warn"
      size="small"
      [isHidden]="!inbox.hasUnread()"
    >
      <pi-icon-button
        icon="bell"
        color="grey"
        appearance="ghost"
        [attr.aria-label]="
          inbox.unread()
            ? 'Notificaciones: ' + inbox.unread() + ' sin leer'
            : 'Notificaciones'
        "
        (execute)="open()"
      />
    </pi-badge>

    <ng-template #panel>
      <div class="ts-inbox">
        <div class="ts-inbox__actions">
          <pi-action-button
            size="small"
            color="grey"
            appearance="outline"
            text="Marcar todo como leído"
            [disabled]="!inbox.hasUnread()"
            (execute)="inbox.markRead()"
          />
          @if (inbox.settings()?.emailAvailable) {
            <pi-checkbox
              label="Copia por correo"
              [checked]="inbox.settings()?.email ?? false"
              (checkedChange)="inbox.setEmail($event)"
            />
          }
          @if (inbox.settings()?.pushPublicKey && push.supported) {
            <pi-checkbox
              label="Avisos en este dispositivo"
              [checked]="push.on()"
              [disabled]="push.busy()"
              (checkedChange)="togglePush($event)"
            />
          }
        </div>
        @if (push.error(); as error) {
          <p class="ts-inbox__error" role="alert">{{ error }}</p>
        }
        @if (inbox.items().length) {
          <ul class="ts-inbox__list">
            @for (item of inbox.items(); track item.id) {
              <li>
                <button
                  type="button"
                  class="ts-inbox__item"
                  [class.is-unread]="!item.readAt"
                  (click)="go(item)"
                >
                  <span class="ts-inbox__icon" aria-hidden="true">
                    <pi-icon [icon]="icon(item)" size="small" />
                  </span>
                  <span class="ts-inbox__text">
                    <span class="ts-inbox__summary">{{ item.summary }}</span>
                    <span class="ts-inbox__meta"
                      >{{ item.projectKey }} · {{ ago(item.createdAt) }}</span
                    >
                  </span>
                  @if (!item.readAt) {
                    <span class="ts-inbox__dot" aria-label="Sin leer"></span>
                  }
                </button>
              </li>
            }
          </ul>
        } @else {
          <p class="ts-inbox__empty">
            Nada nuevo. Te avisaremos cuando te asignen algo, comenten en tus
            tickets o los muevan.
          </p>
        }
      </div>
    </ng-template>
  `,
  styles: `
    :host {
      display: inline-flex;
      align-items: center;
    }
    .ts-inbox {
      display: grid;
      gap: 1rem;
    }
    .ts-inbox__actions {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 0.75rem;
    }
    .ts-inbox__error {
      margin: 0;
      color: var(--ts-c-red, var(--ts-ink));
      font-size: 0.8125rem;
    }
    .ts-inbox__list {
      list-style: none;
      margin: 0;
      padding: 0;
      display: grid;
      gap: 0.25rem;
    }
    /* As tall as its text: past @pi/ui's global button look (a fixed
       height that let a two-line notice run over the next one). */
    .ts-inbox__item {
      width: 100%;
      height: auto !important;
      min-width: 0 !important;
      display: flex;
      align-items: flex-start;
      gap: 0.75rem;
      padding: 0.625rem 0.5rem !important;
      line-height: 1.35;
      border: 0;
      border-radius: 0.5rem;
      background: transparent;
      color: inherit;
      font: inherit;
      text-align: left;
      cursor: pointer;
    }
    .ts-inbox__item:hover,
    .ts-inbox__item:focus-visible {
      background: rgba(127, 127, 127, 0.12);
    }
    .ts-inbox__item.is-unread .ts-inbox__summary {
      font-weight: 600;
    }
    .ts-inbox__icon {
      flex: none;
      width: 2rem;
      height: 2rem;
      border-radius: 50%;
      display: grid;
      place-items: center;
      background: rgba(127, 127, 127, 0.14);
    }
    .ts-inbox__text {
      display: grid;
      gap: 0.125rem;
      flex: 1;
      min-width: 0;
    }
    .ts-inbox__meta {
      font-size: 0.8125rem;
      opacity: 0.7;
    }
    .ts-inbox__dot {
      flex: none;
      width: 0.5rem;
      height: 0.5rem;
      margin-top: 0.5rem;
      border-radius: 50%;
      background: var(--ts-brand, #a347e1);
    }
    .ts-inbox__empty {
      opacity: 0.7;
    }
  `,
})
export class NotificationsBell {
  protected readonly inbox = inject(InboxFacade);
  protected readonly push = inject(PushFacade);
  private readonly drawer = inject(DrawerService);
  private readonly router = inject(Router);
  private readonly panel = viewChild.required<TemplateRef<unknown>>('panel');

  protected readonly ago = timeAgo;
  protected icon = (item: Notification) => ICON[item.kind] ?? 'info';

  protected open(): void {
    void this.push.refresh();
    this.drawer.open('Notificaciones', this.panel(), '28rem');
  }

  protected togglePush(on: boolean): void {
    const key = this.inbox.settings()?.pushPublicKey;
    if (on && key) void this.push.turnOn(key);
    else if (!on) void this.push.turnOff();
  }

  protected go(item: Notification): void {
    if (!item.readAt) this.inbox.markRead([item.id]);
    this.drawer.closeAll();
    const project = encodeURIComponent(item.projectKey);
    void this.router.navigateByUrl(
      item.issueKey
        ? `/p/${project}/issues/${encodeURIComponent(item.issueKey)}`
        : `/p/${project}`,
    );
  }
}