Fase 3: Implementación de Listings (Avisos) - Entidades, Repositorio, API y Frontend Wizard integración

src/SIGCM.Infrastructure/Repositories/ListingRepository.cs

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+using System.Data;
+using Dapper;
+using SIGCM.Application.DTOs;
+using SIGCM.Domain.Entities;
+using SIGCM.Domain.Interfaces;
+using SIGCM.Infrastructure.Data;
+
+namespace SIGCM.Infrastructure.Repositories;
+
+public class ListingRepository : IListingRepository
+{
+    private readonly IDbConnectionFactory _connectionFactory;
+
+    public ListingRepository(IDbConnectionFactory connectionFactory)
+    {
+        _connectionFactory = connectionFactory;
+    }
+
+    public async Task<int> CreateAsync(Listing listing, Dictionary<int, string> attributes)
+    {
+        using var conn = _connectionFactory.CreateConnection();
+        conn.Open();
+        using var transaction = conn.BeginTransaction();
+
+        try
+        {
+            var sqlListing = @"
+                INSERT INTO Listings (CategoryId, OperationId, Title, Description, Price, Currency, CreatedAt, Status, UserId)
+                VALUES (@CategoryId, @OperationId, @Title, @Description, @Price, @Currency, @CreatedAt, @Status, @UserId);
+                SELECT CAST(SCOPE_IDENTITY() as int);";
+
+            var listingId = await conn.QuerySingleAsync<int>(sqlListing, listing, transaction);
+
+            if (attributes != null && attributes.Any())
+            {
+                var sqlAttr = @"
+                    INSERT INTO ListingAttributeValues (ListingId, AttributeDefinitionId, Value)
+                    VALUES (@ListingId, @AttributeDefinitionId, @Value)";
+
+                foreach (var attr in attributes)
+                {
+                    await conn.ExecuteAsync(sqlAttr, new { ListingId = listingId, AttributeDefinitionId = attr.Key, Value = attr.Value }, transaction);
+                }
+            }
+
+            transaction.Commit();
+            return listingId;
+        }
+        catch
+        {
+            transaction.Rollback();
+            throw;
+        }
+    }
+
+    public async Task<Listing?> GetByIdAsync(int id)
+    {
+        using var conn = _connectionFactory.CreateConnection();
+        return await conn.QuerySingleOrDefaultAsync<Listing>("SELECT * FROM Listings WHERE Id = @Id", new { Id = id });
+    }
+
+    public async Task<IEnumerable<Listing>> GetAllAsync()
+    {
+        using var conn = _connectionFactory.CreateConnection();
+         // A simple query for now
+        var sql = @"
+            SELECT l.* 
+            FROM Listings l
+            ORDER BY l.CreatedAt DESC";
+        
+        return await conn.QueryAsync<Listing>(sql);
+    }
+}