(feature): webapi base models

src/MaksIT.Core/Abstractions/Webapi/RequestModelBase.cs

@@ -0,0 +1,9 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace MaksIT.Core.Abstractions.Webapi;
+public abstract class RequestModelBase {
+}

src/MaksIT.Core/Abstractions/Webapi/ResponseModelBase.cs

@@ -0,0 +1,9 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace MaksIT.Core.Abstractions.Webapi;
+public abstract class ResponseModelBase {
+}

src/MaksIT.Core/MaksIT.Core.csproj

@@ -8,7 +8,7 @@
 
     <!-- NuGet package metadata -->
     <PackageId>MaksIT.Core</PackageId>
-    <Version>1.0.8</Version>
+    <Version>1.0.9</Version>
     <Authors>Maksym Sadovnychyy</Authors>
     <Company>MAKS-IT</Company>
     <Product>MaksIT.Core</Product>

src/MaksIT.Core/Webapi/Models/PagedRequest.cs

@@ -0,0 +1,118 @@
+using System.Linq.Expressions;
+
+using MaksIT.Core.Abstractions.Webapi;
+
+namespace MaksIT.Core.Webapi.Models;
+public abstract class PagedRequest : RequestModelBase {
+  public int PageSize { get; set; } = 100;
+  public int PageNumber { get; set; } = 1;
+
+  // Global filter applicable to any collection
+  public string? Filters { get; set; }
+
+  // Specific filters for different collections
+  public Dictionary<string, string>? CollectionFilters { get; set; }
+
+  // Optional sorting
+  public string? SortBy { get; set; }
+  public bool IsAscending { get; set; } = true;
+
+  // Method to build an expression for a specific collection, combining global and collection-specific filters
+  public Expression<Func<T, bool>> BuildCollectionFilterExpression<T>(string collectionName) {
+    var expressions = new List<Expression>();
+
+    var parameter = Expression.Parameter(typeof(T), "x");
+
+    // Add global filters if available
+    if (!string.IsNullOrEmpty(Filters)) {
+      var globalFilterExpression = BuildFilterExpression<T>(Filters, parameter);
+      expressions.Add(globalFilterExpression);
+    }
+
+    // Add collection-specific filters if available
+    if (CollectionFilters != null && CollectionFilters.ContainsKey(collectionName) && !string.IsNullOrEmpty(CollectionFilters[collectionName])) {
+      var collectionFilterExpression = BuildFilterExpression<T>(CollectionFilters[collectionName], parameter);
+      expressions.Add(collectionFilterExpression);
+    }
+
+    // Combine the expressions using AND (you can extend to OR logic if needed)
+    Expression combinedExpression;
+    if (expressions.Any()) {
+      combinedExpression = expressions.Aggregate(Expression.AndAlso);
+    }
+    else {
+      // Default to 'true' if no filters are provided
+      combinedExpression = Expression.Constant(true);
+    }
+
+    return Expression.Lambda<Func<T, bool>>(combinedExpression, parameter);
+  }
+
+  // Method to build a LINQ expression from a single filter string (global or collection-specific)
+  public Expression<Func<T, bool>> BuildFilterExpression<T>(string filter, ParameterExpression? parameter = null) {
+    if (string.IsNullOrEmpty(filter))
+      return x => true; // Default to 'true' if no filters are provided
+
+    parameter ??= Expression.Parameter(typeof(T), "x");
+    var expressions = new List<Expression>();
+
+    // Parse the filters string (this logic can be extended to support more complex filtering)
+    var filters = filter.Split(new[] { "AND", "OR" }, StringSplitOptions.None);
+
+    foreach (var subFilter in filters) {
+      if (subFilter.Contains('=')) {
+        var parts = subFilter.Split('=');
+        var propertyName = parts[0].Trim();
+        var value = parts[1].Trim().Replace("'", "");
+
+        var property = Expression.Property(parameter, propertyName);
+        var constant = Expression.Constant(ConvertValue(property.Type, value));
+
+        expressions.Add(Expression.Equal(property, constant));
+      }
+      else if (subFilter.Contains('>') || subFilter.Contains('<')) {
+        var comparisonType = subFilter.Contains(">=") ? ">=" :
+                             subFilter.Contains("<=") ? "<=" :
+                             subFilter.Contains(">") ? ">" : "<";
+        var parts = subFilter.Split(new[] { '>', '<', '=', ' ' }, StringSplitOptions.RemoveEmptyEntries);
+        var propertyName = parts[0].Trim();
+        var value = parts[1].Trim().Replace("'", "");
+
+        var property = Expression.Property(parameter, propertyName);
+        var constant = Expression.Constant(ConvertValue(property.Type, value));
+
+        switch (comparisonType) {
+          case ">":
+            expressions.Add(Expression.GreaterThan(property, constant));
+            break;
+          case "<":
+            expressions.Add(Expression.LessThan(property, constant));
+            break;
+          case ">=":
+            expressions.Add(Expression.GreaterThanOrEqual(property, constant));
+            break;
+          case "<=":
+            expressions.Add(Expression.LessThanOrEqual(property, constant));
+            break;
+        }
+      }
+    }
+
+    // Combine the expressions using AND (you can extend to support OR)
+    var combinedExpression = expressions.Aggregate(Expression.AndAlso);
+
+    return Expression.Lambda<Func<T, bool>>(combinedExpression, parameter);
+  }
+
+  // Helper method to convert the value to the correct type
+  private static object ConvertValue(Type type, string value) {
+    if (type == typeof(int))
+      return int.Parse(value);
+    if (type == typeof(bool))
+      return bool.Parse(value);
+    if (type == typeof(DateTime))
+      return DateTime.Parse(value);
+
+    return value; // Default to string
+  }
+}

src/MaksIT.Core/Webapi/Models/PagedResponse.cs

@@ -0,0 +1,20 @@
+using MaksIT.Core.Abstractions.Webapi;
+
+namespace MaksIT.Core.Webapi.Models;
+
+public class PagedResponse<T> : ResponseModelBase {
+  public IEnumerable<T> Items { get; set; }
+  public int PageNumber { get; set; }
+  public int PageSize { get; set; }
+  public int TotalCount { get; set; }
+  public int TotalPages => (int)Math.Ceiling((double)TotalCount / PageSize);
+  public bool HasPreviousPage => PageNumber > 1;
+  public bool HasNextPage => PageNumber < TotalPages;
+
+  public PagedResponse(IEnumerable<T> items, int totalCount, int pageNumber, int pageSize) {
+    Items = items;
+    TotalCount = totalCount;
+    PageNumber = pageNumber;
+    PageSize = pageSize;
+  }
+}