abzarasadi/Pages/Shop/Index.cshtml.cs

using AsadiTools.Data;
using AsadiTools.Models;
using AsadiTools.Services;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.EntityFrameworkCore;

namespace AsadiTools.Pages.Shop;

public class ShopIndexModel(AppDbContext db, CartService cart) : PageModel
{
    public const int PageSize = 12;

    public List<Product> Products { get; private set; } = [];
    public string? Category { get; private set; }
    public string? Brand { get; private set; }
    public string? Search { get; private set; }
    public int CurrentPage { get; private set; } = 1;
    public int TotalPages { get; private set; }
    public int TotalCount { get; private set; }

    public async Task OnGetAsync(string? category, string? brand, string? search, int page = 1)
    {
        Category = category;
        Brand = brand;
        Search = search;

        var q = db.Products.Where(p => p.IsActive);
        if (category is not null) q = q.Where(p => p.Category == category);
        if (brand is not null)    q = q.Where(p => p.Brand == brand);
        if (search is not null)   q = q.Where(p => p.NameFa.Contains(search) || (p.NameEn != null && p.NameEn.Contains(search)) || (p.Sku != null && p.Sku.Contains(search)));

        TotalCount = await q.CountAsync();
        TotalPages = (int)Math.Ceiling(TotalCount / (double)PageSize);
        CurrentPage = Math.Clamp(page, 1, Math.Max(1, TotalPages));

        Products = await q.OrderByDescending(p => p.Id)
                          .Skip((CurrentPage - 1) * PageSize)
                          .Take(PageSize)
                          .ToListAsync();
    }

    public IActionResult OnPostAddToCart(int productId, string nameFa, decimal price, string? sku)
    {
        cart.AddItem(new CartItem { ProductId = productId, NameFa = nameFa, Price = price, Sku = sku, Qty = 1 });
        return RedirectToPage();
    }
}