import {Component, Inject, OnInit, inject, OnDestroy} from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormBuilder, ReactiveFormsModule, Validators } from '@angular/forms';
import { MatFormField, MatLabel } from '@angular/material/form-field';
import { MatInput } from '@angular/material/input';
import { MatSelectModule } from '@angular/material/select';
import { MatCheckbox } from '@angular/material/checkbox';
import { MatButton, MatIconButton } from '@angular/material/button';
import {
  MatDialogRef,
  MAT_DIALOG_DATA,
  MatDialogActions,
  MatDialogContent,
  MatDialogTitle
} from '@angular/material/dialog';
import { MatIcon } from '@angular/material/icon';

import { catchError, forkJoin, of, Observable } from 'rxjs';

import { PsItem } from '../../interfaces/ps-item';
import { ProductListItem } from '../../interfaces/product-list-item';
import { PrestashopService } from '../../services/prestashop.serivce';

export type ProductDialogData = {
  mode: 'create' | 'edit';
  refs: { categories: PsItem[]; manufacturers: PsItem[]; suppliers: PsItem[]; };
  productRow?: ProductListItem & { priceHt?: number };
};

type CarouselItem = { src: string; isPlaceholder: boolean };

@Component({
  selector: 'app-ps-product-dialog',
  standalone: true,
  templateUrl: './ps-product-dialog.component.html',
  styleUrls: ['./ps-product-dialog.component.css'],
  imports: [
    CommonModule, ReactiveFormsModule,
    MatFormField, MatLabel, MatInput, MatSelectModule, MatCheckbox,
    MatButton, MatDialogActions, MatDialogContent, MatDialogTitle,
    MatIcon, MatIconButton
  ]
})
export class PsProductDialogComponent implements OnInit, OnDestroy {
  private readonly fb = inject(FormBuilder);
  private readonly ps = inject(PrestashopService);

  constructor(
    @Inject(MAT_DIALOG_DATA) public data: ProductDialogData,
    private readonly dialogRef: MatDialogRef<PsProductDialogComponent>
  ) {}

  mode!: 'create' | 'edit';
  categories: PsItem[] = [];
  manufacturers: PsItem[] = [];
  suppliers: PsItem[] = [];
  productRow?: ProductListItem & { priceHt?: number };

  images: File[] = [];
  existingImageUrls: string[] = [];

  // Previews des fichiers nouvellement sélectionnés
  previewUrls: string[] = [];

  // items du carrousel (existants + nouveaux + placeholder)
  carouselItems: CarouselItem[] = [];
  currentIndex = 0;

  // options possibles pour l'état (Neuf, Très bon état, etc.)
  conditionOptions: string[] = [];

  // on conserve la dernière description chargée pour éviter l’écrasement à vide
  private lastLoadedDescription = '';

  form = this.fb.group({
    name: ['', Validators.required],
    description: [''],
    categoryId: [null as number | null, Validators.required],
    manufacturerId: [null as number | null, Validators.required],
    supplierId: [null as number | null, Validators.required],
    complete: [true],
    hasManual: [true],
    conditionLabel: ['', Validators.required],
    priceTtc: [0, [Validators.required, Validators.min(0)]],
    quantity: [0, [Validators.required, Validators.min(0)]],
  });

  // ---------- Helpers locaux ----------

  private toTtc(ht: number) {
    return Math.round(((ht * 1.2) + Number.EPSILON) * 100) / 100;
  }

  /** normalisation simple pour comparaison de labels (insensible à casse/accents) */
  private normalizeLabel(s: string): string {
    return String(s ?? '')
      .normalize('NFD')
      .replaceAll(/[\u0300-\u036f]/g, '')
      .toLowerCase()
      .trim();
  }

  /** enlève <![CDATA[ ... ]]> si présent */
  private stripCdata(s: string): string {
    if (!s) return '';
    return s.startsWith('<![CDATA[') && s.endsWith(']]>')
      ? s.slice(9, -3)
      : s;
  }

  /** convertit du HTML en texte (pour le textarea) */
  private htmlToText(html: string): string {
    if (!html) return '';
    const div = document.createElement('div');
    div.innerHTML = html;
    return (div.textContent || div.innerText || '').trim();
  }

  /** nettoyage CDATA+HTML -> texte simple */
  private cleanForTextarea(src: string): string {
    return this.htmlToText(this.stripCdata(src ?? ''));
  }

  ngOnInit(): void {
    this.mode = this.data.mode;
    this.productRow = this.data.productRow;

    // Les refs viennent déjà triées du service
    const rawCategories = this.data.refs.categories ?? [];
    const rawManufacturers = this.data.refs.manufacturers ?? [];
    const rawSuppliers = this.data.refs.suppliers ?? [];

    const forbiddenCats = new Set(['racine', 'root', 'accueil', 'home']);

    // on filtre seulement ici, tri déjà fait côté service
    this.categories = rawCategories.filter(
      c => !forbiddenCats.has(this.normalizeLabel(c.name))
    );
    this.manufacturers = rawManufacturers;
    this.suppliers = rawSuppliers;

    // charger les valeurs possibles pour l’état (Neuf, Très bon état, etc.)
    this.ps.getConditionValues()
      .pipe(catchError(() => of<string[]>([])))
      .subscribe((opts: string[]) => this.conditionOptions = opts);

    // ---- Mode édition : pré-remplissage ----
    if (this.mode === 'edit' && this.productRow) {
      const r = this.productRow;

      const immediateTtc = r.priceHt == null ? 0 : this.toTtc(r.priceHt);
      this.form.patchValue({
        name: r.name,
        categoryId: r.id_category_default ?? null,
        manufacturerId: r.id_manufacturer ?? null,
        supplierId: r.id_supplier ?? null,
        priceTtc: immediateTtc
      });

      const details$ = this.ps.getProductDetails(r.id).pipe(
        catchError(() => of({
          id: r.id, name: r.name, description: '',
          id_manufacturer: r.id_manufacturer, id_supplier: r.id_supplier,
          id_category_default: r.id_category_default, priceHt: r.priceHt ?? 0
        }))
      );
      const qty$ = this.ps.getProductQuantity(r.id).pipe(catchError(() => of(0)));
      const imgs$ = this.ps.getProductImageUrls(r.id).pipe(catchError(() => of<string[]>([])));
      const flags$ = this.ps.getProductFlags(r.id).pipe(
        catchError(() => of({ complete: false, hasManual: false, conditionLabel: undefined }))
      );

      forkJoin({ details: details$, qty: qty$, imgs: imgs$, flags: flags$ })
        .subscribe(({ details, qty, imgs, flags }) => {
          const ttc = this.toTtc(details.priceHt ?? 0);
          const baseDesc = this.cleanForTextarea(details.description ?? '');
          this.lastLoadedDescription = baseDesc;

          this.form.patchValue({
            description: baseDesc,
            complete: flags.complete,
            hasManual: flags.hasManual,
            conditionLabel: flags.conditionLabel || '',
            priceTtc: (ttc || this.form.value.priceTtc || 0),
            quantity: qty,
            categoryId: (details.id_category_default ?? this.form.value.categoryId) ?? null,
            manufacturerId: (details.id_manufacturer ?? this.form.value.manufacturerId) ?? null,
            supplierId: (details.id_supplier ?? this.form.value.supplierId) ?? null
          });

          this.existingImageUrls = imgs;
          this.buildCarousel();
        });
    } else {
      // mode création : uniquement placeholder au début
      this.buildCarousel();
    }
  }

  // -------- Carrousel / gestion des fichiers --------

  onFiles(ev: Event) {
    const fl = (ev.target as HTMLInputElement).files;

    // Nettoyage des anciens objectURL
    for(let url of this.previewUrls) {
      URL.revokeObjectURL(url);
    }
    this.previewUrls = [];
    this.images = [];

    if (fl) {
      this.images = Array.from(fl);
      this.previewUrls = this.images.map(f => URL.createObjectURL(f));
    }

    this.buildCarousel();

    // si on a ajouté des images, se placer sur la première nouvelle
    if (this.images.length && this.existingImageUrls.length + this.previewUrls.length > 0) {
      this.currentIndex = this.existingImageUrls.length; // première nouvelle
    }
  }

  private buildCarousel() {
    const items: CarouselItem[] = [
      ...this.existingImageUrls.map(u => ({ src: u, isPlaceholder: false })),
      ...this.previewUrls.map(u => ({ src: u, isPlaceholder: false }))
    ];

    // placeholder en dernier
    items.push({ src: '', isPlaceholder: true });

    this.carouselItems = items;
    if (!this.carouselItems.length) {
      this.currentIndex = 0;
    } else if (this.currentIndex >= this.carouselItems.length) {
      this.currentIndex = 0;
    }
  }

  prev() {
    if (!this.carouselItems.length) return;
    this.currentIndex = (this.currentIndex - 1 + this.carouselItems.length) % this.carouselItems.length;
  }

  next() {
    if (!this.carouselItems.length) return;
    this.currentIndex = (this.currentIndex + 1) % this.carouselItems.length;
  }

  onThumbClick(index: number) {
    if (index < 0 || index >= this.carouselItems.length) return;
    this.currentIndex = index;
  }

  ngOnDestroy() {
    // Nettoyage des objectURL
    for (let url of this.previewUrls) {
      URL.revokeObjectURL(url);
    }
  }

  // -------- Save / close inchangés (à part dto.images) --------

  save() {
    if (this.form.invalid) return;

    const v = this.form.getRawValue();
    const effectiveDescription = (v.description ?? '').trim() || this.lastLoadedDescription;

    const dto = {
      name: v.name!,
      description: effectiveDescription,
      categoryId: +v.categoryId!,
      manufacturerId: +v.manufacturerId!,
      supplierId: +v.supplierId!,
      images: this.images,              // toujours les fichiers sélectionnés
      complete: !!v.complete,
      hasManual: !!v.hasManual,
      conditionLabel: v.conditionLabel || undefined,
      priceTtc: Number(v.priceTtc ?? 0),
      vatRate: 0.2,
      quantity: Math.max(0, Number(v.quantity ?? 0))
    };

    let op$: Observable<unknown>;
    if (this.mode === 'create' || !this.productRow) {
      op$ = this.ps.createProduct(dto) as Observable<unknown>;
    } else {
      op$ = this.ps.updateProduct(this.productRow.id, dto) as Observable<unknown>;
    }

    op$.subscribe({
      next: () => this.dialogRef.close(true),
      error: (e: unknown) => alert('Erreur: ' + (e instanceof Error ? e.message : String(e)))
    });
  }

  close() {
    this.dialogRef.close(false);
  }
}