From cf98f958ac338045855160ced71b7bb6d00545bc Mon Sep 17 00:00:00 2001
From: cuqmbr <dr.juniorf@gmail.com>
Date: Wed, 12 Oct 2022 10:51:35 +0300
Subject: [PATCH] feat: add filtering/searching to countries controller

---
 Server/Services/CountryManagementService.cs   | 74 ++++++++++++++++---
 .../CountryParameters.cs                      |  3 +-
 .../QueryStringParameters.cs                  |  2 +
 3 files changed, 68 insertions(+), 11 deletions(-)

diff --git a/Server/Services/CountryManagementService.cs b/Server/Services/CountryManagementService.cs
index 2caad8d..e16c8ca 100644
--- a/Server/Services/CountryManagementService.cs
+++ b/Server/Services/CountryManagementService.cs
@@ -30,20 +30,74 @@ public class CountryManagementService : ICountryManagementService
         return (true, String.Empty, _mapper.Map<CountryDto>(country));
     }
 
-    public async
-        Task<(bool isSucceed, string message, IEnumerable<CountryDto> countries,
+    public async Task<(bool isSucceed, string message, IEnumerable<CountryDto> countries,
             PagingMetadata<Country> pagingMetadata)> GetCountries(CountryParameters parameters)
     {
-        var dbCountries = await _dbContext.Countries
-            .Skip((parameters.PageNumber - 1) * parameters.PageSize)
-            .Take(parameters.PageSize)
-            .ToListAsync();
+        var dbCountries = _dbContext.Countries.AsQueryable();
+        
+        SearchByAllCountryFields(ref dbCountries, parameters.Search);
+        SearchByCountryCode(ref dbCountries, parameters.CountryCode);
+        SearchByCountryName(ref dbCountries, parameters.CountryName);
 
-        var pagingMetadata = new PagingMetadata<Country>(_dbContext.Countries,
-            parameters.PageNumber, parameters.PageSize);
+        var pagingMetadata = ApplyPaging(ref dbCountries, parameters.PageNumber,
+            parameters.PageSize);
 
-        return (true, "", dbCountries.ConvertAll(c => _mapper.Map<CountryDto>(c)),
-            pagingMetadata);
+        var countryDtos = dbCountries.ToList()
+            .ConvertAll(c => _mapper.Map<CountryDto>(c));
+        
+        return (true, "", countryDtos, pagingMetadata);
+
+        void SearchByAllCountryFields(ref IQueryable<Country> countries,
+            string? search)
+        {
+            if (!countries.Any() || String.IsNullOrWhiteSpace(search))
+            {
+                return;
+            }
+            
+            var s = search.Trim().ToLower();
+
+            countries = countries.Where(c =>
+                c.Code.ToLower().Contains(search) ||
+                c.Name.ToLower().Contains(search));
+        }
+        
+        void SearchByCountryCode(ref IQueryable<Country> countries,
+            string? countryCode)
+        {
+            if (!countries.Any() || String.IsNullOrWhiteSpace(countryCode))
+            {
+                return;
+            }
+
+            countries = countries.Where(c =>
+                c.Code.ToLower().Contains(countryCode.Trim().ToLower()));
+        }
+        
+        void SearchByCountryName(ref IQueryable<Country> countries,
+            string? countryName)
+        {
+            if (!countries.Any() || String.IsNullOrWhiteSpace(countryName))
+            {
+                return;
+            }
+
+            countries = countries.Where(c =>
+                c.Name.ToLower().Contains(countryName.Trim().ToLower()));
+        }
+
+        PagingMetadata<Country> ApplyPaging(ref IQueryable<Country> countries,
+            int pageNumber, int pageSize)
+        {
+            var metadata = new PagingMetadata<Country>(countries,
+                parameters.PageNumber, parameters.PageSize);
+            
+            countries = countries
+                .Skip((parameters.PageNumber - 1) * parameters.PageSize)
+                .Take(parameters.PageSize);
+
+            return metadata;
+        }
     }
     
     public async Task<(bool isSucceed, string message, CountryDto country)> GetCountry(int id)
diff --git a/SharedModels/QueryStringParameters/CountryParameters.cs b/SharedModels/QueryStringParameters/CountryParameters.cs
index 9f7d560..e4227b7 100644
--- a/SharedModels/QueryStringParameters/CountryParameters.cs
+++ b/SharedModels/QueryStringParameters/CountryParameters.cs
@@ -2,5 +2,6 @@ namespace SharedModels.QueryStringParameters;
 
 public class CountryParameters : QueryStringParameters
 {
-    
+    public string? CountryCode { get; set; }
+    public string? CountryName { get; set; }
 }
\ No newline at end of file
diff --git a/SharedModels/QueryStringParameters/QueryStringParameters.cs b/SharedModels/QueryStringParameters/QueryStringParameters.cs
index fe916be..5623baa 100644
--- a/SharedModels/QueryStringParameters/QueryStringParameters.cs
+++ b/SharedModels/QueryStringParameters/QueryStringParameters.cs
@@ -11,4 +11,6 @@ public class QueryStringParameters
         get => _pageSize;
         set => _pageSize = value > MaxPageSize ? MaxPageSize : value;
     }
+    
+    public string? Search { get; set; }
 }
\ No newline at end of file