import { Component, OnInit, ViewChild, computed, inject, signal } from '@angular/core';
import { ActivatedRoute, Router } from '@angular/router';
import { ApiService } from '../../core/api.service';
import { FontPreferenceService } from '../../core/font-preference.service';
import { I18nService } from '../../core/i18n.service';
import { SoundService } from '../../core/sound.service';
import { TodayResponse, ViewMode } from '../../core/models';
import { BoardViewComponent } from './board-view.component';
import { FocusViewComponent } from './focus-view.component';
import { WalletComponent } from './wallet.component';
import { MorningTimerComponent } from './morning-timer.component';
import { ProgressBarComponent } from './progress-bar.component';
import { EventBannerComponent } from './event-banner.component';
import { CelebrationOverlayComponent } from './celebration-overlay.component';
import { ToggleEvent } from './task-card.component';

/** Moneda voladora: parte del check de la tarea y vuela al monedero. */
interface FlyingCoin {
  id: number;
  x: number;
  y: number;
  dx: number;
  dy: number;
  flying: boolean;
}

/**
 * Pantalla "HOY". Orquesta la carga del día, el conmutado Tablero/Foco (persistido),
 * el marcado de tareas con su feedback (monedas voladoras, rebote del monedero,
 * sonido) y la celebración al completar el día.
 */
@Component({
  selector: 'app-home',
  imports: [
    BoardViewComponent,
    FocusViewComponent,
    WalletComponent,
    MorningTimerComponent,
    ProgressBarComponent,
    EventBannerComponent,
    CelebrationOverlayComponent,
  ],
  templateUrl: './home.component.html',
  styleUrl: './home.component.scss',
})
export class HomeComponent implements OnInit {
  private readonly api = inject(ApiService);
  private readonly route = inject(ActivatedRoute);
  private readonly router = inject(Router);
  private readonly sound = inject(SoundService);
  private readonly fontPreference = inject(FontPreferenceService);
  protected readonly i18n = inject(I18nService);

  @ViewChild('wallet') private wallet?: WalletComponent;

  protected readonly today = signal<TodayResponse | null>(null);
  protected readonly loading = signal(true);
  protected readonly mode = signal<ViewMode>('BOARD');
  protected readonly coins = signal<FlyingCoin[]>([]);
  protected readonly celebrating = signal(false);
  protected readonly lastEarned = signal(0);
  /** true mientras se muestra la vista previa (solo lectura) de mañana. */
  protected readonly viewingTomorrow = signal(false);

  private childId!: number;
  private coinSeq = 0;

  /** Todas las tareas en orden (mañana y luego tarde) para el modo Foco. */
  protected readonly allTasks = computed(() => {
    const t = this.today();
    return t ? [...t.morning, ...t.afternoon] : [];
  });

  /** Fecha mostrada (hoy o mañana, según la vista) formateada en el idioma activo. */
  protected readonly dateLabel = computed(() => {
    const locale = this.i18n.lang() === 'CA' ? 'ca-ES' : 'es-ES';
    const date = new Date();
    if (this.viewingTomorrow()) {
      date.setDate(date.getDate() + 1);
    }
    return new Intl.DateTimeFormat(locale, {
      weekday: 'long',
      day: 'numeric',
      month: 'long',
    }).format(date);
  });

  ngOnInit(): void {
    this.childId = Number(this.route.snapshot.paramMap.get('childId'));
    this.load();
  }

  private load(): void {
    this.api.getToday(this.childId).subscribe({
      next: (data) => {
        this.today.set(data);
        this.mode.set(data.child.viewMode);
        this.i18n.setLang(data.child.language);
        // Aplica la preferencia de tipografía de ESTE niño.
        this.fontPreference.apply(data.child.dyslexiaFont);
        this.loading.set(false);
      },
      error: () => this.loading.set(false),
    });
  }

  /** Cambia entre Tablero y Foco y persiste la preferencia del niño. */
  setMode(mode: ViewMode): void {
    if (mode === this.mode()) {
      return;
    }
    this.mode.set(mode);
    this.api.updateSettings(this.childId, { viewMode: mode }).subscribe();
  }

  /** Alterna entre hoy y la vista previa (solo lectura) de mañana. */
  toggleDay(): void {
    if (this.viewingTomorrow()) {
      this.viewingTomorrow.set(false);
      this.load();
      return;
    }
    this.api.getTomorrow(this.childId).subscribe((data) => {
      this.today.set(data);
      this.viewingTomorrow.set(true);
    });
  }

  /** Marca/desmarca una tarea y aplica el feedback (monedas, sonido, celebración). */
  onToggle(ev: ToggleEvent): void {
    // La vista de mañana es solo lectura: mirar, no marcar.
    if (this.viewingTomorrow()) {
      return;
    }
    this.api.toggleTask(ev.taskId).subscribe((result) => {
      const current = this.today();
      if (!current) {
        return;
      }

      // Actualiza estado del día de forma inmutable.
      const apply = (list: typeof current.morning) =>
        list.map((task) => (task.id === ev.taskId ? { ...task, done: result.done } : task));
      const updated: TodayResponse = {
        ...current,
        morning: apply(current.morning),
        afternoon: apply(current.afternoon),
        progress: result.progress,
        wallet: { coins: result.newBalance },
      };
      this.today.set(updated);

      // Feedback positivo solo al ganar monedas (marcar, no desmarcar). Sonido y
      // vibración se disparan juntos sobre el mismo evento (armonía multimodal).
      if (result.coinsEarned > 0) {
        this.flyCoins(ev.x, ev.y, result.coinsEarned);
        this.wallet?.bump();
        if (current.child.soundEnabled) {
          this.sound.playReward();
          this.sound.buzz();
        }
      }

      // Celebración al completar TODO el día.
      if (result.progress.total > 0 && result.progress.totalDone === result.progress.total) {
        this.lastEarned.set(result.coinsEarned);
        this.celebrating.set(true);
      }
    });
  }

  /** Lanza monedas desde (x,y) hacia el monedero. */
  private flyCoins(x: number, y: number, earned: number): void {
    const rect = this.wallet?.getRect();
    if (!rect) {
      return;
    }
    const targetX = rect.left + rect.width / 2;
    const targetY = rect.top + rect.height / 2;
    const n = Math.min(Math.max(1, Math.round(earned / 5)), 6);

    const nuevas: FlyingCoin[] = [];
    for (let k = 0; k < n; k++) {
      const jitterX = (k - n / 2) * 14;
      const startX = x + jitterX;
      const startY = y;
      nuevas.push({
        id: this.coinSeq++,
        x: startX,
        y: startY,
        dx: targetX - startX,
        dy: targetY - startY,
        flying: false,
      });
    }
    this.coins.update((c) => [...c, ...nuevas]);

    // En el siguiente frame, activa la transición (vuelo).
    requestAnimationFrame(() =>
      requestAnimationFrame(() =>
        this.coins.update((c) =>
          c.map((coin) => (nuevas.some((nc) => nc.id === coin.id) ? { ...coin, flying: true } : coin)),
        ),
      ),
    );

    // Retira las monedas tras la animación.
    const ids = new Set(nuevas.map((c) => c.id));
    setTimeout(() => this.coins.update((c) => c.filter((coin) => !ids.has(coin.id))), 800);
  }

  goProfiles(): void {
    this.router.navigate(['/']);
  }

  goStore(): void {
    this.router.navigate(['/store', this.childId]);
  }
}