using System;
using System.Collections.Generic;
using System.Linq;
using Generic.Services;
using Xunit;

namespace Generic.Tests.Services;

public class AdvancedFilterExtensionTests
{
    public class TestEntity
    {
        public Guid Id { get; set; }
        public double Price { get; set; }
        public string SKU { get; set; } = string.Empty;
        public List<TestTranslation> Translations { get; set; } = new();
    }

    public class TestTranslation
    {
        public string Language { get; set; } = string.Empty;
        public TestInfo Info { get; set; } = new();
    }

    public class TestInfo
    {
        public string Name { get; set; } = string.Empty;
    }

    public class TestFilter
    {
        public double? Price { get; set; }
        public string? SKU { get; set; }
        public string? Language { get; set; }
        public string? Name { get; set; }
    }

    private List<TestEntity> GetTestData()
    {
        return new List<TestEntity>
        {
            new TestEntity
            {
                Id = Guid.NewGuid(),
                Price = 100,
                SKU = "IPHONE-15",
                Translations = new List<TestTranslation>
                {
                    new TestTranslation { Language = "en", Info = new TestInfo { Name = "iPhone 15" } },
                    new TestTranslation { Language = "ar", Info = new TestInfo { Name = "آيفون ١٥" } }
                }
            },
            new TestEntity
            {
                Id = Guid.NewGuid(),
                Price = 200,
                SKU = "SAMSUNG-S24",
                Translations = new List<TestTranslation>
                {
                    new TestTranslation { Language = "en", Info = new TestInfo { Name = "Samsung S24" } },
                    new TestTranslation { Language = "ar", Info = new TestInfo { Name = "سامسونج اس ٢٤" } }
                }
            }
        };
    }

    [Fact]
    public void ApplyAdvancedFilter_RootProperty_Works()
    {
        // Arrange
        var data = GetTestData().AsQueryable();
        var filter = new TestFilter { Price = 100 };

        // Act
        var result = data.ApplyAdvancedFilter(filter).ToList();

        // Assert
        Assert.Single(result);
        Assert.Equal("IPHONE-15", result[0].SKU);
    }

    [Fact]
    public void ApplyAdvancedFilter_DeepNestedProperty_Works()
    {
        // Arrange
        var data = GetTestData().AsQueryable();
        var filter = new TestFilter { Name = "iPhone" };

        // Act
        var result = data.ApplyAdvancedFilter(filter).ToList();

        // Assert
        Assert.Single(result);
        Assert.Equal("IPHONE-15", result[0].SKU);
    }

    [Fact]
    public void ApplyAdvancedFilter_GroupedCorrelatedProperties_Works()
    {
        // Arrange
        var data = GetTestData().AsQueryable();
        // Search for "iPhone" but only in Arabic (should return nothing because Arabic name is "آيفون")
        var filter = new TestFilter { Language = "ar", Name = "iPhone" };

        // Act
        var result = data.ApplyAdvancedFilter(filter).ToList();

        // Assert
        Assert.Empty(result);
    }

    [Fact]
    public void ApplyAdvancedFilter_GroupedCorrelatedProperties_CorrectMatch_Works()
    {
        // Arrange
        var data = GetTestData().AsQueryable();
        // Search for "آيفون" in Arabic
        var filter = new TestFilter { Language = "ar", Name = "آيفون" };

        // Act
        var result = data.ApplyAdvancedFilter(filter).ToList();

        // Assert
        Assert.Single(result);
        Assert.Equal("IPHONE-15", result[0].SKU);
    }
    [Fact]
    public void ApplyAdvancedFilter_CaseInsensitiveSearch_Works()
    {
        // Arrange
        var data = GetTestData().AsQueryable();
        // Search for "IPHONE" (all caps) vs "iPhone 15"
        var filter = new TestFilter { Name = "IPHONE" };

        // Act
        var result = data.ApplyAdvancedFilter(filter).ToList();

        // Assert
        Assert.Single(result);
        Assert.Equal("IPHONE-15", result[0].SKU);
    }
}