import { ChangeDetectionStrategy, Component, inject, signal } from '@angular/core';
import { Api } from '../../core/api';
import { Feedback } from '../../core/feedback';
import { errorMessage, formatBytes, formatDateTime, formatRelative } from '../../core/format';
import type { BackupFile, BackupSchedule } from '../../core/models';
import { Icon } from '../../shared/icon';
import { JobConsole } from '../../shared/job-console';

@Component({
  selector: 'app-backups',
  imports: [Icon, JobConsole],
  template: `
    <div class="page">
      <header class="page-header">
        <div>
          <h1>Sauvegardes</h1>
          <p>
            Export de toutes les bases MariaDB et archive de <span class="mono">/srv</span> (sans
            node_modules).
          </p>
        </div>
        <button type="button" class="btn primary" (click)="run()" [disabled]="starting()">
          <app-icon name="archive" /> Lancer une sauvegarde
        </button>
      </header>

      @if (error()) {
        <div class="alert critical" role="alert">
          <app-icon name="critical" />
          <p>{{ error() }}</p>
        </div>
      }

      <div class="alert warning">
        <app-icon name="alert" />
        <p>
          Les sauvegardes restent sur le VPS (<span class="mono">{{ dir() }}</span
          >). Télécharge-les régulièrement : si le serveur est perdu, elles le sont aussi.
        </p>
      </div>

      @if (jobId(); as id) {
        <app-job-console [jobId]="id" (finished)="load()" />
      }

      <section class="grid-tiles">
        <div class="card tile">
          <span class="tile-label">Sauvegarde automatique</span>
          <span class="tile-value small">{{
            schedule()?.dailyAt ? 'Chaque jour à ' + schedule()!.dailyAt : 'Désactivée'
          }}</span>
          <span class="tile-sub">Variable BACKUP_DAILY_AT</span>
        </div>
        <div class="card tile">
          <span class="tile-label">Conservation</span>
          <span class="tile-value small">{{ schedule()?.keep ?? '–' }} de chaque type</span>
          <span class="tile-sub">Les plus anciennes sont supprimées</span>
        </div>
        <div class="card tile">
          <span class="tile-label">Dernière sauvegarde</span>
          <span class="tile-value small">{{
            files()[0] ? relative(files()[0].createdAt) : 'Aucune'
          }}</span>
          <span class="tile-sub">{{ files()[0] ? dateTime(files()[0].createdAt) : '' }}</span>
        </div>
      </section>

      <section class="card">
        <div class="card-body flush table-wrap">
          <table class="table">
            <thead>
              <tr>
                <th>Fichier</th>
                <th>Contenu</th>
                <th class="num">Taille</th>
                <th>Date</th>
                <th class="actions"><span class="sr-only">Actions</span></th>
              </tr>
            </thead>
            <tbody>
              @for (file of files(); track file.name) {
                <tr>
                  <td class="mono">{{ file.name }}</td>
                  <td>{{ file.type === 'db' ? 'Bases de données' : 'Dossier /srv' }}</td>
                  <td class="num">{{ bytes(file.size) }}</td>
                  <td class="nowrap">{{ dateTime(file.createdAt) }}</td>
                  <td class="actions">
                    <a
                      class="btn small"
                      [href]="api.backupUrl(file.name)"
                      [attr.download]="file.name"
                    >
                      <app-icon name="download" /> Télécharger
                    </a>
                    <button
                      type="button"
                      class="btn small icon-only danger"
                      (click)="remove(file)"
                      [attr.aria-label]="'Supprimer ' + file.name"
                    >
                      <app-icon name="trash" />
                    </button>
                  </td>
                </tr>
              } @empty {
                <tr>
                  <td colspan="5" class="empty">Aucune sauvegarde pour l’instant.</td>
                </tr>
              }
            </tbody>
          </table>
        </div>
      </section>
    </div>
  `,
  styles: `
    .tile-value.small {
      font-size: 18px;
    }
  `,
  changeDetection: ChangeDetectionStrategy.OnPush,
})
export class BackupsPage {
  protected api = inject(Api);
  private feedback = inject(Feedback);

  protected readonly files = signal<BackupFile[]>([]);
  protected readonly schedule = signal<BackupSchedule | null>(null);
  protected readonly dir = signal('');
  protected readonly error = signal<string | null>(null);
  protected readonly starting = signal(false);
  protected readonly jobId = signal<number | null>(null);

  protected readonly bytes = formatBytes;
  protected readonly dateTime = formatDateTime;
  protected readonly relative = formatRelative;

  constructor() {
    this.load();
  }

  async load() {
    try {
      const result = await this.api.backups();
      this.files.set(result.files);
      this.schedule.set(result.schedule);
      this.dir.set(result.dir);
      this.error.set(null);
    } catch (error) {
      this.error.set(errorMessage(error));
    }
  }

  protected async run() {
    this.starting.set(true);
    try {
      const { jobId } = await this.api.runBackup();
      this.jobId.set(jobId);
    } catch (error) {
      this.feedback.error(errorMessage(error));
    } finally {
      this.starting.set(false);
    }
  }

  protected async remove(file: BackupFile) {
    const ok = await this.feedback.confirm({
      title: 'Supprimer cette sauvegarde ?',
      message: `${file.name} sera supprimé du serveur. C’est définitif.`,
      confirmLabel: 'Supprimer',
      danger: true,
    });
    if (!ok) return;
    try {
      await this.api.deleteBackup(file.name);
      this.feedback.success('Sauvegarde supprimée.');
      await this.load();
    } catch (error) {
      this.feedback.error(errorMessage(error));
    }
  }
}