From 665a16d6c10a14b1f89a62b38cb70bde1813d4bb Mon Sep 17 00:00:00 2001
From: hectorrhg <hectorrhg@estudiantes.uci.cu>
Date: Tue, 14 May 2024 00:24:37 -0400
Subject: [PATCH] Add pagination classes and extensions

---
 .../Extensions/PaginationExtensions.cs        | 24 +++++++++++++++++++
 .../Utils/PaginatedRequest.cs                 |  7 ++++++
 .../Utils/PaginatedResponse.cs                | 19 +++++++++++++++
 3 files changed, 50 insertions(+)
 create mode 100644 src/TemplateFastEndpoints.API/Extensions/PaginationExtensions.cs
 create mode 100644 src/TemplateFastEndpoints.API/Utils/PaginatedRequest.cs
 create mode 100644 src/TemplateFastEndpoints.API/Utils/PaginatedResponse.cs

diff --git a/src/TemplateFastEndpoints.API/Extensions/PaginationExtensions.cs b/src/TemplateFastEndpoints.API/Extensions/PaginationExtensions.cs
new file mode 100644
index 0000000..c4285d9
--- /dev/null
+++ b/src/TemplateFastEndpoints.API/Extensions/PaginationExtensions.cs
@@ -0,0 +1,24 @@
+using TemplateFastEndpoints.API.Utils;
+
+namespace TemplateFastEndpoints.API.Extensions;
+
+public static class PaginationExtensions
+{
+    /// <summary>
+    /// Extension method to paginate a source collection.
+    /// </summary>
+    /// <typeparam name="T">The type of the elements in the source.</typeparam>
+    /// <param name="source">The source collection to paginate. Can be IQueryable or IEnumerable.</param>
+    /// <param name="pageNumber">The page number to retrieve.</param>
+    /// <param name="pageSize">The page size (number of items per page).</param>
+    /// <returns>A paginated response containing the items on the requested page and pagination information.</returns>
+    public static PaginatedResponse<T> ToPaginatedResult<T>(this IEnumerable<T> source, int pageNumber, int pageSize)
+    {
+        var enumerable = source as IQueryable<T> ?? source.AsQueryable();
+        var items = enumerable.Skip((pageNumber - 1) * pageSize).Take(pageSize).ToList();
+
+        var totalRecords = enumerable.Count();
+        var totalPages = (int)Math.Ceiling((double)totalRecords / pageSize);
+        return new PaginatedResponse<T>(items, pageNumber, pageSize, totalPages, totalRecords);
+    }
+}
\ No newline at end of file
diff --git a/src/TemplateFastEndpoints.API/Utils/PaginatedRequest.cs b/src/TemplateFastEndpoints.API/Utils/PaginatedRequest.cs
new file mode 100644
index 0000000..df0e08d
--- /dev/null
+++ b/src/TemplateFastEndpoints.API/Utils/PaginatedRequest.cs
@@ -0,0 +1,7 @@
+namespace TemplateFastEndpoints.API.Utils;
+
+public class PaginatedRequest
+{
+    public int PageNumber { get; set; }
+    public int PageSize { get; set; }
+}
\ No newline at end of file
diff --git a/src/TemplateFastEndpoints.API/Utils/PaginatedResponse.cs b/src/TemplateFastEndpoints.API/Utils/PaginatedResponse.cs
new file mode 100644
index 0000000..42b6551
--- /dev/null
+++ b/src/TemplateFastEndpoints.API/Utils/PaginatedResponse.cs
@@ -0,0 +1,19 @@
+namespace TemplateFastEndpoints.API.Utils;
+
+public class PaginatedResponse<T>
+{
+    public PaginatedResponse(IEnumerable<T> data, int pageNumber, int pageSize,int totalPages, int totalRecords)
+    {
+        Data = data;
+        PageNumber = pageNumber;
+        PageSize = pageSize;
+        TotalPages = totalPages;
+        TotalRecords = totalRecords;
+    }
+
+    public IEnumerable<T> Data { get; set; }
+    public int PageNumber { get; set; }
+    public int PageSize { get; set; }
+    public int TotalPages { get; set; }
+    public int TotalRecords { get; set; }
+}
\ No newline at end of file