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

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.Json.Nodes;
using Microsoft.Extensions.VectorData;
using Microsoft.Extensions.VectorData.ProviderServices;
using Microsoft.SemanticKernel.Connectors.AzureAISearch;
using Xunit;

namespace SemanticKernel.Connectors.AzureAISearch.UnitTests;

/// <summary>
/// Tests for the <see cref="AzureAISearchDynamicMapper"/> class.
/// </summary>
public class AzureAISearchDynamicMapperTests
{
    private static readonly CollectionModel s_model = BuildModel(
    [
        new VectorStoreKeyProperty("Key", typeof(string)),
        new VectorStoreDataProperty("StringDataProp", typeof(string)),
        new VectorStoreDataProperty("IntDataProp", typeof(int)),
        new VectorStoreDataProperty("NullableIntDataProp", typeof(int?)),
        new VectorStoreDataProperty("LongDataProp", typeof(long)),
        new VectorStoreDataProperty("NullableLongDataProp", typeof(long?)),
        new VectorStoreDataProperty("FloatDataProp", typeof(float)),
        new VectorStoreDataProperty("NullableFloatDataProp", typeof(float?)),
        new VectorStoreDataProperty("DoubleDataProp", typeof(double)),
        new VectorStoreDataProperty("NullableDoubleDataProp", typeof(double?)),
        new VectorStoreDataProperty("BoolDataProp", typeof(bool)),
        new VectorStoreDataProperty("NullableBoolDataProp", typeof(bool?)),
        new VectorStoreDataProperty("DateTimeOffsetDataProp", typeof(DateTimeOffset)),
        new VectorStoreDataProperty("NullableDateTimeOffsetDataProp", typeof(DateTimeOffset?)),
        new VectorStoreDataProperty("TagListDataProp", typeof(string[])),
        new VectorStoreVectorProperty("FloatVector", typeof(ReadOnlyMemory<float>), 10),
        new VectorStoreVectorProperty("NullableFloatVector", typeof(ReadOnlyMemory<float>?), 10),
    ]);

    private static readonly float[] s_vector1 = [1.0f, 2.0f, 3.0f];
    private static readonly float[] s_vector2 = [4.0f, 5.0f, 6.0f];
    private static readonly string[] s_taglist = ["tag1", "tag2"];

    [Fact]
    public void MapFromDataToStorageModelMapsAllSupportedTypes()
    {
        // Arrange
        var sut = new AzureAISearchDynamicMapper(s_model, null);
        var dataModel = new Dictionary<string, object?>
        {
            ["Key"] = "key",

            ["StringDataProp"] = "string",
            ["IntDataProp"] = 1,
            ["NullableIntDataProp"] = 2,
            ["LongDataProp"] = 3L,
            ["NullableLongDataProp"] = 4L,
            ["FloatDataProp"] = 5.0f,
            ["NullableFloatDataProp"] = 6.0f,
            ["DoubleDataProp"] = 7.0,
            ["NullableDoubleDataProp"] = 8.0,
            ["BoolDataProp"] = true,
            ["NullableBoolDataProp"] = false,
            ["DateTimeOffsetDataProp"] = new DateTimeOffset(2021, 1, 1, 0, 0, 0, TimeSpan.Zero),
            ["NullableDateTimeOffsetDataProp"] = new DateTimeOffset(2021, 1, 1, 0, 0, 0, TimeSpan.Zero),
            ["TagListDataProp"] = s_taglist,

            ["FloatVector"] = new ReadOnlyMemory<float>(s_vector1),
            ["NullableFloatVector"] = new ReadOnlyMemory<float>(s_vector2)
        };

        // Act
        var storageModel = sut.MapFromDataToStorageModel(dataModel, 0, null);

        // Assert
        Assert.Equal("key", (string?)storageModel["Key"]);
        Assert.Equal("string", (string?)storageModel["StringDataProp"]);
        Assert.Equal(1, (int?)storageModel["IntDataProp"]);
        Assert.Equal(2, (int?)storageModel["NullableIntDataProp"]);
        Assert.Equal(3L, (long?)storageModel["LongDataProp"]);
        Assert.Equal(4L, (long?)storageModel["NullableLongDataProp"]);
        Assert.Equal(5.0f, (float?)storageModel["FloatDataProp"]);
        Assert.Equal(6.0f, (float?)storageModel["NullableFloatDataProp"]);
        Assert.Equal(7.0, (double?)storageModel["DoubleDataProp"]);
        Assert.Equal(8.0, (double?)storageModel["NullableDoubleDataProp"]);
        Assert.Equal(true, (bool?)storageModel["BoolDataProp"]);
        Assert.Equal(false, (bool?)storageModel["NullableBoolDataProp"]);
        Assert.Equal(new DateTimeOffset(2021, 1, 1, 0, 0, 0, TimeSpan.Zero), (DateTimeOffset?)storageModel["DateTimeOffsetDataProp"]);
        Assert.Equal(new DateTimeOffset(2021, 1, 1, 0, 0, 0, TimeSpan.Zero), (DateTimeOffset?)storageModel["NullableDateTimeOffsetDataProp"]);
        Assert.Equal(s_taglist, storageModel["TagListDataProp"]!.AsArray().Select(x => (string)x!).ToArray());
        Assert.Equal(s_vector1, storageModel["FloatVector"]!.AsArray().Select(x => (float)x!).ToArray());
        Assert.Equal(s_vector2, storageModel["NullableFloatVector"]!.AsArray().Select(x => (float)x!).ToArray());
    }

    [Fact]
    public void MapFromDataToStorageModelMapsNullValues()
    {
        // Arrange
        var model = BuildModel(
        [
            new VectorStoreKeyProperty("Key", typeof(string)),
            new VectorStoreDataProperty("StringDataProp", typeof(string)),
            new VectorStoreDataProperty("NullableIntDataProp", typeof(int?)),
            new VectorStoreVectorProperty("NullableFloatVector", typeof(ReadOnlyMemory<float>?), 10),
        ]);

        var dataModel = new Dictionary<string, object?>
        {
            ["Key"] = "key",
            ["StringDataProp"] = null,
            ["NullableIntDataProp"] = null,
            ["NullableFloatVector"] = null
        };

        var sut = new AzureAISearchDynamicMapper(model, null);

        // Act
        var storageModel = sut.MapFromDataToStorageModel(dataModel, 0, null);

        // Assert
        Assert.Null(storageModel["StringDataProp"]);
        Assert.Null(storageModel["NullableIntDataProp"]);
        Assert.Null(storageModel["NullableFloatVector"]);
    }

    [Fact]
    public void MapFromStorageToDataModelMapsAllSupportedTypes()
    {
        // Arrange
        var sut = new AzureAISearchDynamicMapper(s_model, null);
        var storageModel = new JsonObject
        {
            ["Key"] = "key",
            ["StringDataProp"] = "string",
            ["IntDataProp"] = 1,
            ["NullableIntDataProp"] = 2,
            ["LongDataProp"] = 3L,
            ["NullableLongDataProp"] = 4L,
            ["FloatDataProp"] = 5.0f,
            ["NullableFloatDataProp"] = 6.0f,
            ["DoubleDataProp"] = 7.0,
            ["NullableDoubleDataProp"] = 8.0,
            ["BoolDataProp"] = true,
            ["NullableBoolDataProp"] = false,
            ["DateTimeOffsetDataProp"] = new DateTimeOffset(2021, 1, 1, 0, 0, 0, TimeSpan.Zero),
            ["NullableDateTimeOffsetDataProp"] = new DateTimeOffset(2021, 1, 1, 0, 0, 0, TimeSpan.Zero),
            ["TagListDataProp"] = new JsonArray { "tag1", "tag2" },
            ["FloatVector"] = new JsonArray { 1.0f, 2.0f, 3.0f },
            ["NullableFloatVector"] = new JsonArray { 4.0f, 5.0f, 6.0f }
        };

        // Act
        var dataModel = sut.MapFromStorageToDataModel(storageModel, includeVectors: true);

        // Assert
        Assert.Equal("key", dataModel["Key"]);
        Assert.Equal("string", dataModel["StringDataProp"]);
        Assert.Equal(1, dataModel["IntDataProp"]);
        Assert.Equal(2, dataModel["NullableIntDataProp"]);
        Assert.Equal(3L, dataModel["LongDataProp"]);
        Assert.Equal(4L, dataModel["NullableLongDataProp"]);
        Assert.Equal(5.0f, dataModel["FloatDataProp"]);
        Assert.Equal(6.0f, dataModel["NullableFloatDataProp"]);
        Assert.Equal(7.0, dataModel["DoubleDataProp"]);
        Assert.Equal(8.0, dataModel["NullableDoubleDataProp"]);
        Assert.Equal(true, dataModel["BoolDataProp"]);
        Assert.Equal(false, dataModel["NullableBoolDataProp"]);
        Assert.Equal(new DateTimeOffset(2021, 1, 1, 0, 0, 0, TimeSpan.Zero), dataModel["DateTimeOffsetDataProp"]);
        Assert.Equal(new DateTimeOffset(2021, 1, 1, 0, 0, 0, TimeSpan.Zero), dataModel["NullableDateTimeOffsetDataProp"]);
        Assert.Equal(s_taglist, dataModel["TagListDataProp"]);
        Assert.Equal(s_vector1, ((ReadOnlyMemory<float>)dataModel["FloatVector"]!).ToArray());
        Assert.Equal(s_vector2, ((ReadOnlyMemory<float>)dataModel["NullableFloatVector"]!)!.ToArray());
    }

    [Fact]
    public void MapFromStorageToDataModelMapsNullValues()
    {
        // Arrange
        var model = BuildModel(
        [
            new VectorStoreKeyProperty("Key", typeof(string)),
            new VectorStoreDataProperty("StringDataProp", typeof(string)),
            new VectorStoreDataProperty("NullableIntDataProp", typeof(int?)),
            new VectorStoreVectorProperty("NullableFloatVector", typeof(ReadOnlyMemory<float>?), 10),
        ]);

        var storageModel = new JsonObject
        {
            ["Key"] = "key",
            ["StringDataProp"] = null,
            ["NullableIntDataProp"] = null,
            ["NullableFloatVector"] = null
        };

        var sut = new AzureAISearchDynamicMapper(model, null);

        // Act
        var dataModel = sut.MapFromStorageToDataModel(storageModel, includeVectors: true);

        // Assert
        Assert.Equal("key", dataModel["Key"]);
        Assert.Null(dataModel["StringDataProp"]);
        Assert.Null(dataModel["NullableIntDataProp"]);
        Assert.Null(dataModel["NullableFloatVector"]);
    }

    [Fact]
    public void MapFromStorageToDataModelThrowsForMissingKey()
    {
        // Arrange
        var model = BuildModel(
        [
            new VectorStoreKeyProperty("Key", typeof(string)),
            new VectorStoreDataProperty("StringDataProp", typeof(string)),
            new VectorStoreDataProperty("NullableIntDataProp", typeof(int?)),
            new VectorStoreVectorProperty("NullableFloatVector", typeof(ReadOnlyMemory<float>?), 10),
        ]);

        var sut = new AzureAISearchDynamicMapper(model, null);
        var storageModel = new JsonObject();

        // Act
        var exception = Assert.Throws<InvalidOperationException>(() => sut.MapFromStorageToDataModel(storageModel, includeVectors: true));

        // Assert
        Assert.Equal("The key property 'Key' is missing from the record retrieved from storage.", exception.Message);
    }

    [Fact]
    public void MapFromDataToStorageModelSkipsMissingProperties()
    {
        // Arrange
        var model = BuildModel(
        [
            new VectorStoreKeyProperty("Key", typeof(string)),
            new VectorStoreDataProperty("StringDataProp", typeof(string)),
            new VectorStoreVectorProperty("FloatVector", typeof(ReadOnlyMemory<float>), 10),
        ]);

        var dataModel = new Dictionary<string, object?> { ["Key"] = "key" };
        var sut = new AzureAISearchDynamicMapper(model, null);

        // Act
        var storageModel = sut.MapFromDataToStorageModel(dataModel, 0, null);

        // Assert
        Assert.Equal("key", (string?)storageModel["Key"]);
        Assert.False(storageModel.ContainsKey("StringDataProp"));
        Assert.False(storageModel.ContainsKey("FloatVector"));
    }

    [Fact]
    public void MapFromStorageToDataModelSkipsMissingProperties()
    {
        // Arrange
        var model = BuildModel(
        [
            new VectorStoreKeyProperty("Key", typeof(string)),
            new VectorStoreDataProperty("StringDataProp", typeof(string)),
            new VectorStoreVectorProperty("FloatVector", typeof(ReadOnlyMemory<float>), 10),
        ]);

        var storageModel = new JsonObject
        {
            ["Key"] = "key"
        };

        var sut = new AzureAISearchDynamicMapper(model, null);

        // Act
        var dataModel = sut.MapFromStorageToDataModel(storageModel, includeVectors: true);

        // Assert
        Assert.Equal("key", dataModel["Key"]);
        Assert.False(dataModel.ContainsKey("StringDataProp"));
        Assert.False(dataModel.ContainsKey("FloatVector"));
    }

    private static CollectionModel BuildModel(List<VectorStoreProperty> properties)
        => new AzureAISearchDynamicModelBuilder()
            .BuildDynamic(
                new() { Properties = properties },
                defaultEmbeddingGenerator: null);
}