import {Component, computed, inject, OnInit, output, signal, viewChild} from '@angular/core';
import {NzTableComponent, NzThMeasureDirective} from "ng-zorro-antd/table";
import {ModalNav} from "../modal-nav/modal-nav";
import {NzIconDirective} from "ng-zorro-antd/icon";
import {StockForm} from "../stock-form/stock-form";
import {NzDividerComponent} from "ng-zorro-antd/divider";
import {FormsModule} from "@angular/forms";
import {NzCheckboxComponent} from "ng-zorro-antd/checkbox";
import {GetProductDto, ProductsService, WarehouseproductsService} from "../../services/api";
import {NzNotificationService} from "ng-zorro-antd/notification";
import {firstValueFrom} from "rxjs";

interface ProductWithQuantity extends GetProductDto {
    totalQuantity?: number;
}

@Component({
    selector: 'app-stock-table',
    imports: [
        NzTableComponent,
        ModalNav,
        NzIconDirective,
        StockForm,
        NzDividerComponent,
        FormsModule,
        NzCheckboxComponent,
        NzThMeasureDirective,
    ],
    templateUrl: './stock-table.html',
    styleUrl: './stock-table.css',
})

export class StockTable implements OnInit {
    private productsService = inject(ProductsService);
    private wareHousseProductsService = inject(WarehouseproductsService)
    private notificationService = inject(NzNotificationService)
    products = signal<ProductWithQuantity[]>([]);
    productsLoading = signal<boolean>(false);
    updateProduct = viewChild.required<StockForm>('stockForm');
    modal = viewChild.required<ModalNav>('modalNav');

    checked = false;
    indeterminate = false;
    setOfCheckedId = new Set<number>();
    selectionChange = output<boolean>()
    currentPageData: GetProductDto[] = [];

    private searchQuery = signal<string>('');

    filteredProducts = computed(() => {
        const q = this.searchQuery().toLowerCase().trim();

        if (!q) return this.products();

        return this.products().filter(s => {
            const name = (s.name ?? '').toLowerCase();
            return name.includes(q);
        });
    });

    applySearch(query: string) {
        this.searchQuery.set(query);
    }
    get hasSelection(): boolean {
        return this.setOfCheckedId.size > 0;
    }

    updateCheckedSet(id: number, checked: boolean): void {
        if (checked) this.setOfCheckedId.add(id);
        else this.setOfCheckedId.delete(id);
    }

    onItemChecked(id: number, checked: boolean): void {
        this.updateCheckedSet(id, checked);
        this.refreshCheckedStatus();
    }

    onAllChecked(checked: boolean): void {
        this.currentPageData.forEach(item =>
            this.updateCheckedSet(item.id, checked)
        );
        this.refreshCheckedStatus();
    }

    onCurrentPageDataChange($event: GetProductDto[]): void {
        this.currentPageData = $event;
        this.refreshCheckedStatus();
    }

    refreshCheckedStatus(): void {
        const total = this.currentPageData.length;
        const checkedCount = this.currentPageData.filter(p => this.setOfCheckedId.has(p.id)).length;

        this.checked = checkedCount === total;
        this.indeterminate = checkedCount > 0 && checkedCount < total;

        setTimeout(() => this.selectionChange.emit(this.hasSelection));
    }

    get selectedIds() {
        return Array.from(this.setOfCheckedId);
    }

    async ngOnInit() {
        await this.fetchProducts();
    }

    async fetchTotalQuantity(product: ProductWithQuantity) {
        try {
            const res = await firstValueFrom(
                this.wareHousseProductsService.getTotalQuantityEndpoint(product.id)
            );
            product.totalQuantity = res.totalQuantity;
        } catch (e) {
            product.totalQuantity = 0;
        }
    }

    async fetchProducts() {
        this.productsLoading.set(true);
        try {
            const products = await firstValueFrom(this.productsService.getAllProductsEndpoint());

            // transforme chaque produit en ProductWithQuantity
            const productsWithQuantity: ProductWithQuantity[] = products.map(p => ({ ...p }));

            this.products.set(productsWithQuantity);

            // récupérer la quantité pour chaque produit en parallèle
            await Promise.all(productsWithQuantity.map(p => this.fetchTotalQuantity(p)));

            // déclencher la mise à jour du signal
            this.products.set([...productsWithQuantity]);
        } catch (e) {
            this.notificationService.error(
                'Erreur',
                'Erreur de communication avec l\'API'
            );
        }
        this.productsLoading.set(false);
    }

    async delete(productId:number) {
        try {
            await firstValueFrom(this.productsService.deleteProductEndpoint(productId))
            this.notificationService.success(
                'Success',
                'Suppression effectuée'
            )
        } catch (e) {
            this.notificationService.error(
                'Erreur',
                'Impossible de supprimer la ligne'
            )
        }
        await this.fetchProducts();
    }

    async edit(id: number, updateProductComponent: StockForm) {
        if (updateProductComponent.stockForm.invalid) {
            this.notificationService.error(
                'Erreur',
                'Erreur d\'écriture dans le formulaire'
            )
            return;
        }

        try {

            const products = updateProductComponent.stockForm.getRawValue();
            await firstValueFrom(this.productsService.patchProductMinimalStockEndpoint(id, products))

            this.notificationService.success(
                'Success',
                'Limite de stock modifiée'
            )
        } catch (e) {
            console.error(e);
            this.notificationService.error(
                'Erreur',
                'Erreur lors de la modification'
            )
        }
    }

    selectedProduct: GetProductDto | null = null;
    openEditModal(product: GetProductDto) {
        this.selectedProduct = { ...product};
        this.modal().showModal();
    }

    async onModalOk(productId: number, updateProductComponent: StockForm, modal: ModalNav) {
        if (!this.selectedProduct) return;

        await this.edit(productId, updateProductComponent);
        updateProductComponent.stockForm.reset();
        modal.isVisible = false;
        await this.fetchProducts();
    }

    onModalCancel(modal: ModalNav) {
        modal.isVisible = false;
    }
}