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

using System.Text.Json;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.SemanticKernel;
using Microsoft.SemanticKernel.Connectors.OpenAI;
using Microsoft.SemanticKernel.Data;
using Microsoft.SemanticKernel.Plugins.Web.Bing;

namespace GettingStartedWithTextSearch;

/// <summary>
/// This example shows how to use <see cref="ITextSearch"/> for Function Calling.
/// </summary>
public class Step3_Search_With_FunctionCalling(ITestOutputHelper output) : BaseTest(output)
{
    /// <summary>
    /// Show how to create a default <see cref="KernelPlugin"/> from an <see cref="BingTextSearch"/> and use it with
    /// function calling to have the LLM include grounding context in it's response.
    /// </summary>
    [Fact]
    public async Task FunctionCallingWithBingTextSearchAsync()
    {
        // Create a kernel with OpenAI chat completion
        IKernelBuilder kernelBuilder = Kernel.CreateBuilder();
        kernelBuilder.AddOpenAIChatCompletion(
                modelId: TestConfiguration.OpenAI.ChatModelId,
                apiKey: TestConfiguration.OpenAI.ApiKey);
        kernelBuilder.Services.AddSingleton<ITestOutputHelper>(this.Output);
        kernelBuilder.Services.AddSingleton<IFunctionInvocationFilter, FunctionInvocationFilter>();
        Kernel kernel = kernelBuilder.Build();

        // Create a search service with Bing search
        var textSearch = new BingTextSearch(new(TestConfiguration.Bing.ApiKey));

        // Build a text search plugin with Bing search and add to the kernel
        var searchPlugin = textSearch.CreateWithSearch("SearchPlugin");
        kernel.Plugins.Add(searchPlugin);

        // Invoke prompt and use text search plugin to provide grounding information
        OpenAIPromptExecutionSettings settings = new() { FunctionChoiceBehavior = FunctionChoiceBehavior.Auto() };
        KernelArguments arguments = new(settings);
        Console.WriteLine(await kernel.InvokePromptAsync("What is the Semantic Kernel?", arguments));
    }

    /// <summary>
    /// Show how to create a default <see cref="KernelPlugin"/> from an <see cref="BingTextSearch"/> and use it with
    /// function calling and have the LLM include links in the final response.
    /// </summary>
    [Fact]
    public async Task FunctionCallingWithBingTextSearchIncludingCitationsAsync()
    {
        // Create a kernel with OpenAI chat completion
        IKernelBuilder kernelBuilder = Kernel.CreateBuilder();
        kernelBuilder.AddOpenAIChatCompletion(
                modelId: TestConfiguration.OpenAI.ChatModelId,
                apiKey: TestConfiguration.OpenAI.ApiKey);
        Kernel kernel = kernelBuilder.Build();

        // Create a search service with Bing search
        var textSearch = new BingTextSearch(new(TestConfiguration.Bing.ApiKey));

        // Build a text search plugin with Bing search and add to the kernel
        var searchPlugin = textSearch.CreateWithGetTextSearchResults("SearchPlugin");
        kernel.Plugins.Add(searchPlugin);

        // Invoke prompt and use text search plugin to provide grounding information
        OpenAIPromptExecutionSettings settings = new() { FunctionChoiceBehavior = FunctionChoiceBehavior.Auto() };
        KernelArguments arguments = new(settings);
        Console.WriteLine(await kernel.InvokePromptAsync("What is the Semantic Kernel? Include citations to the relevant information where it is referenced in the response.", arguments));
    }

#pragma warning disable CS0618 // Suppress obsolete warnings for legacy TextSearchOptions/TextSearchFilter usage
    /// <summary>
    /// Show how to create a default <see cref="KernelPlugin"/> from an <see cref="BingTextSearch"/> and use it with
    /// function calling to have the LLM include grounding context from the Microsoft Dev Blogs site in it's response.
    /// </summary>
    [Fact]
    public async Task FunctionCallingWithBingTextSearchUsingDevBlogsSiteAsync()

    {
        // Create a kernel with OpenAI chat completion
        IKernelBuilder kernelBuilder = Kernel.CreateBuilder();
        kernelBuilder.AddOpenAIChatCompletion(
                modelId: TestConfiguration.OpenAI.ChatModelId,
                apiKey: TestConfiguration.OpenAI.ApiKey);
        Kernel kernel = kernelBuilder.Build();

        // Create a search service with Bing search
        var textSearch = new BingTextSearch(new(TestConfiguration.Bing.ApiKey));

        // Build a text search plugin with Bing search and add to the kernel
        var filter = new TextSearchFilter().Equality("site", "devblogs.microsoft.com");
        var searchOptions = new TextSearchOptions() { Filter = filter };
        var searchPlugin = KernelPluginFactory.CreateFromFunctions(
            "SearchPlugin", "Search Microsoft Developer Blogs site only",
            [textSearch.CreateGetTextSearchResults(searchOptions: searchOptions)]);
        kernel.Plugins.Add(searchPlugin);

        // Invoke prompt and use text search plugin to provide grounding information
        OpenAIPromptExecutionSettings settings = new() { FunctionChoiceBehavior = FunctionChoiceBehavior.Auto() };
        KernelArguments arguments = new(settings);
        Console.WriteLine(await kernel.InvokePromptAsync("What is the Semantic Kernel? Include citations to the relevant information where it is referenced in the response.", arguments));
    }

    /// <summary>
    /// Show how to create a default <see cref="KernelPlugin"/> from an <see cref="BingTextSearch"/> and use it with
    /// function calling to have the LLM include grounding context from the Microsoft Dev Blogs site in it's response.
    /// </summary>
    [Fact]
    public async Task FunctionCallingWithBingTextSearchUsingSiteArgumentAsync()
    {
        // Create a kernel with OpenAI chat completion
        IKernelBuilder kernelBuilder = Kernel.CreateBuilder();
        kernelBuilder.AddOpenAIChatCompletion(
                modelId: TestConfiguration.OpenAI.ChatModelId,
                apiKey: TestConfiguration.OpenAI.ApiKey);
        Kernel kernel = kernelBuilder.Build();

        // Create a search service with Bing search
        var textSearch = new BingTextSearch(new(TestConfiguration.Bing.ApiKey));

        // Build a text search plugin with Bing search and add to the kernel
        var searchPlugin = KernelPluginFactory.CreateFromFunctions("SearchPlugin", "Search specified site", [CreateSearchBySite(textSearch)]);
        kernel.Plugins.Add(searchPlugin);

        // Invoke prompt and use text search plugin to provide grounding information
        OpenAIPromptExecutionSettings settings = new() { FunctionChoiceBehavior = FunctionChoiceBehavior.Auto() };
        KernelArguments arguments = new(settings);
        Console.WriteLine(await kernel.InvokePromptAsync("What is the Semantic Kernel? Only include results from techcommunity.microsoft.com. Include citations to the relevant information where it is referenced in the response.", arguments));
    }

    #region private
    private sealed class FunctionInvocationFilter(ITestOutputHelper output) : IFunctionInvocationFilter
    {
        public async Task OnFunctionInvocationAsync(FunctionInvocationContext context, Func<FunctionInvocationContext, Task> next)
        {
            if (context.Function.PluginName == "SearchPlugin")
            {
                output.WriteLine($"{context.Function.Name}:{JsonSerializer.Serialize(context.Arguments)}\n");
            }
            await next(context);
        }
    }

    private static KernelFunction CreateSearchBySite(BingTextSearch textSearch, TextSearchFilter? filter = null)
    {
        var options = new KernelFunctionFromMethodOptions()
        {
            FunctionName = "Search",
            Description = "Perform a search for content related to the specified query and optionally from the specified domain.",
            Parameters =
            [
                new KernelParameterMetadata("query") { Description = "What to search for", IsRequired = true },
                new KernelParameterMetadata("count") { Description = "Number of results", IsRequired = false, DefaultValue = 2 },
                new KernelParameterMetadata("skip") { Description = "Number of results to skip", IsRequired = false, DefaultValue = 0 },
                new KernelParameterMetadata("site") { Description = "Only return results from this domain", IsRequired = false, DefaultValue = 2 },
            ],
            ReturnParameter = new() { ParameterType = typeof(KernelSearchResults<string>) },
        };

        return textSearch.CreateSearch(options);
    }
#pragma warning restore CS0618
    #endregion
}
