using PyroFetes.DTO.Product.Request;
using PyroFetes.DTO.Product.Response;
using FastEndpoints;
using Microsoft.EntityFrameworkCore;
using PyroFetes.Models;

namespace PyroFetes.Endpoints.Product;

// Endpoint permettant de mettre à jour un produit existant
public class UpdateProductEndpoint(PyroFetesDbContext db)
    : Endpoint<UpdateProductDto, GetProductDto>
{
    public override void Configure()
    {
        // Route HTTP PUT avec un paramètre d'identifiant dans l'URL
        Put("/api/products/{@id}", x => new { x.Id });

        // Autorise les requêtes anonymes (sans authentification)
        AllowAnonymous();
    }

    public override async Task HandleAsync(UpdateProductDto req, CancellationToken ct)
    {
        // Recherche du produit à mettre à jour, en incluant les relations Prices et WarehouseProducts
        var product = await db.Products
            .Include(p => p.Prices)
            .Include(p => p.WarehouseProducts)
            .SingleOrDefaultAsync(p => p.Id == req.Id, ct);

        // Si le produit n'existe pas, on retourne une réponse 404
        if (product is null)
        {
            await Send.NotFoundAsync(ct);
            return;
        }

        // Mise à jour des propriétés principales du produit
        product.Reference = req.References.ToString(); // Converti int → string
        product.Name = req.Name;
        product.Duration = req.Duration;
        product.Caliber = req.Caliber;
        product.ApprovalNumber = req.ApprovalNumber;
        product.Weight = req.Weight;
        product.Nec = req.Nec;
        product.Image = req.Image;
        product.Link = req.Link;
        product.ClassificationId = req.ClassificationId;
        product.ProductCategoryId = req.ProductCategoryId;

        // Mise à jour des prix fournisseurs associés
        db.Prices.RemoveRange(product.Prices);
        foreach (var s in req.Suppliers)
        {
            db.Prices.Add(new Price
            {
                ProductId = product.Id,
                SupplierId = s.SupplierId,
                SellingPrice = s.SellingPrice
            });
        }

        // Mise à jour des entrepôts associés
        db.WarehouseProducts.RemoveRange(product.WarehouseProducts);
        foreach (var w in req.Warehouses)
        {
            db.WarehouseProducts.Add(new WarehouseProduct
            {
                ProductId = product.Id,
                WarehouseId = w.WarehouseId,
                Quantity = w.Quantity
            });
        }

        await db.SaveChangesAsync(ct);

        // Construction de la réponse renvoyée au client
        var response = new GetProductDto
        {
            Id = product.Id,
            Reference = req.References, // DTO garde int pour cohérence
            Name = req.Name,
            Duration = req.Duration,
            Caliber = req.Caliber,
            ApprovalNumber = req.ApprovalNumber,
            Weight = req.Weight,
            Nec = req.Nec,
            // Le prix de vente est pris depuis Prices
            SellingPrice = req.Suppliers.FirstOrDefault()?.SellingPrice ?? 0,
            Image = req.Image,
            Link = req.Link,
            ClassificationId = req.ClassificationId,
            ProductCategoryId = req.ProductCategoryId,

            Suppliers = req.Suppliers.Select(s => new ProductSupplierPriceDto
            {
                SupplierId = s.SupplierId,
                SellingPrice = s.SellingPrice
            }).ToList(),

            Warehouses = req.Warehouses.Select(w => new GetProductWarehouseDto
            {
                WarehouseId = w.WarehouseId,
                Quantity = w.Quantity,
                WarehouseName = db.Warehouses
                    .FirstOrDefault(x => x.Id == w.WarehouseId)?.Name ?? string.Empty
            }).ToList()
        };

        await Send.OkAsync(response, ct);
    }
}