// Copyright (c) Microsoft. All rights reserved.

using System;
using System.Collections.Generic;
using Azure.Search.Documents.Indexes.Models;
using Microsoft.Extensions.VectorData;
using Microsoft.Extensions.VectorData.ProviderServices;
using Microsoft.SemanticKernel.Connectors.AzureAISearch;
using Xunit;

namespace SemanticKernel.Connectors.AzureAISearch.UnitTests;

/// <summary>
/// Contains tests for the <see cref="AzureAISearchCollectionCreateMapping"/> class.
/// </summary>
public class AzureAISearchCollectionCreateMappingTests
{
    [Fact]
    public void MapKeyFieldCreatesSearchableField()
    {
        // Arrange
        var keyProperty = new KeyPropertyModel("testkey", typeof(string)) { StorageName = "test_key" };

        // Act
        var result = AzureAISearchCollectionCreateMapping.MapKeyField(keyProperty);

        // Assert
        Assert.NotNull(result);
        Assert.Equal("test_key", result.Name);
        Assert.True(result.IsKey);
        Assert.True(result.IsFilterable);
    }

    [Theory]
    [InlineData(true)]
    [InlineData(false)]
    public void MapFilterableStringDataFieldCreatesSimpleField(bool isFilterable)
    {
        // Arrange
        var dataProperty = new DataPropertyModel("testdata", typeof(string))
        {
            IsIndexed = isFilterable,
            StorageName = "test_data"
        };

        // Act
        var result = AzureAISearchCollectionCreateMapping.MapDataField(dataProperty);

        // Assert
        Assert.NotNull(result);
        Assert.IsType<SimpleField>(result);
        Assert.Equal("test_data", result.Name);
        Assert.False(result.IsKey);
        Assert.Equal(isFilterable, result.IsFilterable);
    }

    [Theory]
    [InlineData(true)]
    [InlineData(false)]
    public void MapFullTextSearchableStringDataFieldCreatesSearchableField(bool isFilterable)
    {
        // Arrange
        var dataProperty = new DataPropertyModel("testdata", typeof(string))
        {
            IsIndexed = isFilterable,
            IsFullTextIndexed = true,
            StorageName = "test_data"
        };

        // Act
        var result = AzureAISearchCollectionCreateMapping.MapDataField(dataProperty);

        // Assert
        Assert.NotNull(result);
        Assert.IsType<SearchableField>(result);
        Assert.Equal("test_data", result.Name);
        Assert.False(result.IsKey);
        Assert.Equal(isFilterable, result.IsFilterable);
    }

    [Fact]
    public void MapFullTextSearchableStringDataFieldThrowsForInvalidType()
    {
        // Arrange
        var dataProperty = new DataPropertyModel("testdata", typeof(int))
        {
            IsFullTextIndexed = true,
            StorageName = "test_data"
        };

        // Act & Assert
        Assert.Throws<InvalidOperationException>(() => AzureAISearchCollectionCreateMapping.MapDataField(dataProperty));
    }

    [Theory]
    [InlineData(true)]
    [InlineData(false)]
    public void MapDataFieldCreatesSimpleField(bool isFilterable)
    {
        // Arrange
        var dataProperty = new DataPropertyModel("testdata", typeof(int))
        {
            IsIndexed = isFilterable,
            StorageName = "test_data"
        };

        // Act
        var result = AzureAISearchCollectionCreateMapping.MapDataField(dataProperty);

        // Assert
        Assert.NotNull(result);
        Assert.IsType<SimpleField>(result);
        Assert.Equal("test_data", result.Name);
        Assert.Equal(SearchFieldDataType.Int32, result.Type);
        Assert.False(result.IsKey);
        Assert.Equal(isFilterable, result.IsFilterable);
    }

    [Fact]
    public void MapVectorFieldCreatesVectorSearchField()
    {
        // Arrange
        var vectorProperty = new VectorPropertyModel("testvector", typeof(ReadOnlyMemory<float>))
        {
            Dimensions = 10,
            IndexKind = IndexKind.Flat,
            DistanceFunction = DistanceFunction.DotProductSimilarity,
            StorageName = "test_vector"
        };

        // Act
        var (vectorSearchField, algorithmConfiguration, vectorSearchProfile) = AzureAISearchCollectionCreateMapping.MapVectorField(vectorProperty);

        // Assert
        Assert.NotNull(vectorSearchField);
        Assert.NotNull(algorithmConfiguration);
        Assert.NotNull(vectorSearchProfile);
        Assert.Equal("test_vector", vectorSearchField.Name);
        Assert.Equal(vectorProperty.Dimensions, vectorSearchField.VectorSearchDimensions);

        Assert.Equal("test_vectorAlgoConfig", algorithmConfiguration.Name);
        Assert.IsType<ExhaustiveKnnAlgorithmConfiguration>(algorithmConfiguration);
        var flatConfig = algorithmConfiguration as ExhaustiveKnnAlgorithmConfiguration;
        Assert.Equal(VectorSearchAlgorithmMetric.DotProduct, flatConfig!.Parameters.Metric);

        Assert.Equal("test_vectorProfile", vectorSearchProfile.Name);
        Assert.Equal("test_vectorAlgoConfig", vectorSearchProfile.AlgorithmConfigurationName);
    }

    [Theory]
    [InlineData(IndexKind.Hnsw, typeof(HnswAlgorithmConfiguration))]
    [InlineData(IndexKind.Flat, typeof(ExhaustiveKnnAlgorithmConfiguration))]
    public void MapVectorFieldCreatesExpectedAlgoConfigTypes(string indexKind, Type algoConfigType)
    {
        // Arrange
        var vectorProperty = new VectorPropertyModel("testvector", typeof(ReadOnlyMemory<float>))
        {
            Dimensions = 10,
            IndexKind = indexKind,
            DistanceFunction = DistanceFunction.DotProductSimilarity,
            StorageName = "test_vector"
        };

        // Act
        var (vectorSearchField, algorithmConfiguration, vectorSearchProfile) = AzureAISearchCollectionCreateMapping.MapVectorField(vectorProperty);

        // Assert
        Assert.Equal("test_vectorAlgoConfig", algorithmConfiguration.Name);
        Assert.Equal(algoConfigType, algorithmConfiguration.GetType());
    }

    [Fact]
    public void MapVectorFieldDefaultsToHsnwAndCosine()
    {
        // Arrange
        var vectorProperty = new VectorPropertyModel("testvector", typeof(ReadOnlyMemory<float>)) { Dimensions = 10 };

        // Act
        var (vectorSearchField, algorithmConfiguration, vectorSearchProfile) = AzureAISearchCollectionCreateMapping.MapVectorField(vectorProperty);

        // Assert
        Assert.IsType<HnswAlgorithmConfiguration>(algorithmConfiguration);
        var hnswConfig = algorithmConfiguration as HnswAlgorithmConfiguration;
        Assert.Equal(VectorSearchAlgorithmMetric.Cosine, hnswConfig!.Parameters.Metric);
    }

    [Fact]
    public void MapVectorFieldThrowsForUnsupportedDistanceFunction()
    {
        // Arrange
        var vectorProperty = new VectorPropertyModel("testvector", typeof(ReadOnlyMemory<float>))
        {
            Dimensions = 10,
            DistanceFunction = DistanceFunction.ManhattanDistance,
        };

        // Act & Assert
        Assert.Throws<NotSupportedException>(() => AzureAISearchCollectionCreateMapping.MapVectorField(vectorProperty));
    }

    [Theory]
    [MemberData(nameof(DataTypeMappingOptions))]
    public void GetSDKFieldDataTypeMapsTypesCorrectly(Type propertyType, SearchFieldDataType searchFieldDataType)
    {
        // Act & Assert
        Assert.Equal(searchFieldDataType, AzureAISearchCollectionCreateMapping.GetSDKFieldDataType(propertyType));
    }

    public static IEnumerable<object[]> DataTypeMappingOptions()
    {
        yield return new object[] { typeof(string), SearchFieldDataType.String };
        yield return new object[] { typeof(bool), SearchFieldDataType.Boolean };
        yield return new object[] { typeof(int), SearchFieldDataType.Int32 };
        yield return new object[] { typeof(long), SearchFieldDataType.Int64 };
        yield return new object[] { typeof(float), SearchFieldDataType.Double };
        yield return new object[] { typeof(double), SearchFieldDataType.Double };
        yield return new object[] { typeof(DateTimeOffset), SearchFieldDataType.DateTimeOffset };

        yield return new object[] { typeof(string[]), SearchFieldDataType.Collection(SearchFieldDataType.String) };
        yield return new object[] { typeof(List<string>), SearchFieldDataType.Collection(SearchFieldDataType.String) };
    }
}