import { Component, OnInit, signal } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';
import { TranslateModule, TranslateService } from '@ngx-translate/core';
import * as QRCode from 'qrcode';
import { ApiService } from '../services/api';
import { AuthService } from '../services/auth';

@Component({
  selector: 'app-settings',
  standalone: true,
  imports: [CommonModule, FormsModule, TranslateModule],
  templateUrl: './settings.html',
})
export class Settings implements OnInit {

  // Recovery email
  recoveryEmail = '';
  recoveryEmailSaved = signal(false);

  // 2FA
  totpEnabled = signal(false);
  totpSetupStep = signal<'idle' | 'scan' | 'disable'>('idle');
  totpQrDataUrl = signal<string | null>(null);
  totpCode = '';
  totpError = signal('');
  totpSuccess = signal('');
  backupCodes = signal<string[]>([]);
  backupCopied = signal(false);

  // Active Sessions
  sessions = signal<any[]>([]);
  sessionsLoading = signal(false);
  revokeLoading = signal<string | null>(null);
  revokeAllLoading = signal(false);

  // Data Export
  exportLoading = signal(false);
  exportedBeforeDelete = signal(false);

  // Notification Preferences
  notifPrefs = signal({ notif_deadlines: true, notif_budget_alerts: true, notif_monthly_summary: false });
  notifSaving = signal(false);
  notifSaved = signal(false);

  // Danger Zone
  showDeleteModal = signal(false);
  showDeletePassword = signal(false);
  deletePassword = '';
  deleteConfirmText = '';
  deleteError = signal('');

  get DELETE_PHRASE(): string {
    return this.translate.instant('profile.delete_account');
  }

  constructor(private api: ApiService, private auth: AuthService, private translate: TranslateService) {}

  ngOnInit(): void {
    this.api.getProfile().subscribe({
      next: (data) => {
        if (data.totp_enabled !== undefined) this.totpEnabled.set(data.totp_enabled);
        if (data.recovery_email !== undefined) this.recoveryEmail = data.recovery_email;
        this.notifPrefs.set({
          notif_deadlines: data.notif_deadlines ?? true,
          notif_budget_alerts: data.notif_budget_alerts ?? true,
          notif_monthly_summary: data.notif_monthly_summary ?? false,
        });
      },
    });
    this.loadSessions();
  }

  // ── Recovery email ────────────────────────────────────────────────────────

  saveRecoveryEmail(): void {
    this.api.updateProfile({ recovery_email: this.recoveryEmail }).subscribe({
      next: () => {
        this.recoveryEmailSaved.set(true);
        setTimeout(() => this.recoveryEmailSaved.set(false), 3000);
      },
    });
  }

  // ── 2FA ──────────────────────────────────────────────────────────────────

  startEnable2FA(): void {
    this.totpError.set('');
    this.totpCode = '';
    this.api.get2FASetup().subscribe({
      next: async (res) => {
        const dataUrl = await QRCode.toDataURL(res.uri, { width: 200, margin: 2 });
        this.totpQrDataUrl.set(dataUrl);
        this.totpSetupStep.set('scan');
      },
    });
  }

  confirmEnable2FA(): void {
    this.totpError.set('');
    this.api.enable2FA(this.totpCode).subscribe({
      next: (res) => {
        this.totpEnabled.set(true);
        this.totpSetupStep.set('idle');
        this.totpQrDataUrl.set(null);
        this.totpCode = '';
        this.backupCodes.set(res.backup_codes ?? []);
      },
      error: () => this.totpError.set('profile.totp_invalid_code'),
    });
  }

  startDisable2FA(): void {
    this.totpError.set('');
    this.totpCode = '';
    this.totpSetupStep.set('disable');
  }

  confirmDisable2FA(): void {
    this.totpError.set('');
    this.api.disable2FA(this.totpCode).subscribe({
      next: () => {
        this.totpEnabled.set(false);
        this.totpSetupStep.set('idle');
        this.totpCode = '';
        this.totpSuccess.set('profile.totp_disabled_success');
        setTimeout(() => this.totpSuccess.set(''), 3000);
      },
      error: () => this.totpError.set('profile.totp_invalid_code'),
    });
  }

  cancelTotp(): void {
    this.totpSetupStep.set('idle');
    this.totpCode = '';
    this.totpError.set('');
    this.totpQrDataUrl.set(null);
  }

  copyBackupCodes(): void {
    navigator.clipboard.writeText(this.backupCodes().join('\n')).then(() => {
      this.backupCopied.set(true);
      setTimeout(() => this.backupCopied.set(false), 2000);
    });
  }

  async downloadBackupCodesPdf(): Promise<void> {
    const { jsPDF } = await import('jspdf');
    const doc = new jsPDF({ unit: 'mm', format: 'a4' });
    const codes = this.backupCodes();

    doc.setFont('helvetica', 'bold');
    doc.setFontSize(18);
    doc.text('Armarium — Backup Codes', 20, 24);

    doc.setFont('helvetica', 'normal');
    doc.setFontSize(10);
    doc.setTextColor(100);
    doc.text('Store these codes in a safe place. Each code can only be used once.', 20, 34);
    doc.text('Use one if you lose access to your authenticator app.', 20, 40);

    doc.setDrawColor(200);
    doc.line(20, 46, 190, 46);

    doc.setFontSize(14);
    doc.setFont('courier', 'normal');
    doc.setTextColor(30);
    codes.forEach((code, i) => {
      doc.text(code, 20, 58 + i * 12);
    });

    doc.setFont('helvetica', 'normal');
    doc.setFontSize(8);
    doc.setTextColor(150);
    doc.text(`Generated ${new Date().toLocaleDateString()} · armarium.app`, 20, 200);

    doc.save('armarium-backup-codes.pdf');
  }

  closeBackupCodes(): void {
    this.backupCodes.set([]);
    this.totpSuccess.set('profile.totp_enabled_success');
    setTimeout(() => this.totpSuccess.set(''), 3000);
  }

  // ── Active Sessions ───────────────────────────────────────────────────────

  loadSessions(): void {
    this.sessionsLoading.set(true);
    this.api.getSessions().subscribe({
      next: (s) => { this.sessions.set(s); this.sessionsLoading.set(false); },
      error: () => this.sessionsLoading.set(false),
    });
  }

  revokeSession(key: string): void {
    this.revokeLoading.set(key);
    this.api.revokeSession(key).subscribe({
      next: () => {
        this.sessions.set(this.sessions().filter(s => s.session_key !== key));
        this.revokeLoading.set(null);
      },
      error: () => this.revokeLoading.set(null),
    });
  }

  revokeAllOtherSessions(): void {
    this.revokeAllLoading.set(true);
    this.api.revokeAllOtherSessions().subscribe({
      next: () => { this.loadSessions(); this.revokeAllLoading.set(false); },
      error: () => this.revokeAllLoading.set(false),
    });
  }

  // ── Data Export ───────────────────────────────────────────────────────────

  downloadExport(): void {
    this.exportLoading.set(true);
    this.api.downloadExport().subscribe({
      next: (blob) => {
        const url = URL.createObjectURL(blob);
        const a = document.createElement('a');
        a.href = url;
        a.download = 'armarium-export.zip';
        a.click();
        URL.revokeObjectURL(url);
        this.exportLoading.set(false);
        this.exportedBeforeDelete.set(true);
      },
      error: () => this.exportLoading.set(false),
    });
  }

  // ── Notification Preferences ──────────────────────────────────────────────

  toggleNotif(key: 'notif_deadlines' | 'notif_budget_alerts' | 'notif_monthly_summary'): void {
    this.notifPrefs.set({ ...this.notifPrefs(), [key]: !this.notifPrefs()[key] });
  }

  saveNotifPrefs(): void {
    this.notifSaving.set(true);
    this.api.updateNotificationPrefs(this.notifPrefs()).subscribe({
      next: () => {
        this.notifSaving.set(false);
        this.notifSaved.set(true);
        setTimeout(() => this.notifSaved.set(false), 3000);
      },
      error: () => this.notifSaving.set(false),
    });
  }

  // ── Danger Zone ───────────────────────────────────────────────────────────

  get deleteFormValid(): boolean {
    return !!this.deletePassword && this.deleteConfirmText === this.DELETE_PHRASE;
  }

  openDeleteModal(): void {
    this.deletePassword = '';
    this.deleteConfirmText = '';
    this.deleteError.set('');
    this.showDeletePassword.set(false);
    this.showDeleteModal.set(true);
  }

  closeDeleteModal(): void {
    this.showDeleteModal.set(false);
    this.deletePassword = '';
    this.deleteConfirmText = '';
    this.deleteError.set('');
    this.showDeletePassword.set(false);
  }

  confirmDelete(): void {
    if (!this.deleteFormValid) return;
    this.deleteError.set('');
    this.api.deleteProfile(this.deletePassword).subscribe({
      next: () => {
        this.closeDeleteModal();
        localStorage.clear();
        sessionStorage.clear();
        window.location.href = 'https://www.armarium.ch';
      },
      error: () => this.deleteError.set('settings.delete_wrong_password'),
    });
  }
}