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

#pragma warning disable IDE0005 // Using directive is unnecessary

using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.SemanticKernel;
using Microsoft.SemanticKernel.ChatCompletion;
using Microsoft.SemanticKernel.Connectors.OpenAI;
using StepwisePlannerMigration.Models;
using StepwisePlannerMigration.Plugins;
using StepwisePlannerMigration.Services;

#pragma warning restore IDE0005 // Using directive is unnecessary

namespace StepwisePlannerMigration.Controllers;

/// <summary>
/// This controller shows a new recommended approach how to use planning capability by using Auto Function Calling.
/// </summary>
[ApiController]
[Route("auto-function-calling")]
public class AutoFunctionCallingController : ControllerBase
{
    private readonly Kernel _kernel;
    private readonly IChatCompletionService _chatCompletionService;
    private readonly IPlanProvider _planProvider;

    public AutoFunctionCallingController(
        Kernel kernel,
        IChatCompletionService chatCompletionService,
        IPlanProvider planProvider)
    {
        this._kernel = kernel;
        this._chatCompletionService = chatCompletionService;
        this._planProvider = planProvider;

        this._kernel.ImportPluginFromType<TimePlugin>();
        this._kernel.ImportPluginFromType<WeatherPlugin>();
    }

    /// <summary>
    /// Action to generate a plan. Generated plan will be populated in <see cref="ChatHistory"/> object.
    /// </summary>
    [HttpPost, Route("generate-plan")]
    public async Task<IActionResult> GeneratePlanAsync(PlanRequest request)
    {
        ChatHistory chatHistory = [];
        chatHistory.AddUserMessage(request.Goal);

        OpenAIPromptExecutionSettings executionSettings = new() { FunctionChoiceBehavior = FunctionChoiceBehavior.Auto() };

        await this._chatCompletionService.GetChatMessageContentAsync(chatHistory, executionSettings, this._kernel);

        return this.Ok(chatHistory);
    }

    /// <summary>
    /// Action to execute a new plan. When generated plan is not needed,
    /// planning result can be obtained directly with <see cref="Kernel"/> object.
    /// </summary>
    [HttpPost, Route("execute-new-plan")]
    public async Task<IActionResult> ExecuteNewPlanAsync(PlanRequest request)
    {
        OpenAIPromptExecutionSettings executionSettings = new() { FunctionChoiceBehavior = FunctionChoiceBehavior.Auto() };

        FunctionResult result = await this._kernel.InvokePromptAsync(request.Goal, new(executionSettings));

        return this.Ok(result.ToString());
    }

    /// <summary>
    /// Action to execute existing plan. Generated plans can be stored in permanent storage for reusability.
    /// In this demo application it is stored in file.
    /// </summary>
    [HttpPost, Route("execute-existing-plan")]
    public async Task<IActionResult> ExecuteExistingPlanAsync()
    {
        ChatHistory chatHistory = this._planProvider.GetPlan("auto-function-calling-plan.json");
        OpenAIPromptExecutionSettings executionSettings = new() { FunctionChoiceBehavior = FunctionChoiceBehavior.Auto() };

        ChatMessageContent result = await this._chatCompletionService.GetChatMessageContentAsync(chatHistory, executionSettings, this._kernel);

        return this.Ok(result.Content);
    }
}