// <copyright file="BaseApiController.cs" company="alveus.dev">
// Copyright (c) alveus.dev. All rights reserved. Licensed under the MIT License.
// </copyright>

using System.Net;
using System.Net.Sockets;
using Astral.ApiServer.Models.Common;
using Astral.Core.Constants;
using Microsoft.AspNetCore.Mvc;

namespace Astral.ApiServer.Controllers;

/// <summary>
/// Base API controller with common methods.
/// </summary>
[Produces("application/json")]
[Consumes("application/x-www-form-urlencoded")]
public class BaseApiController : ControllerBase
{
    /// <summary>
    /// Return a failure status with no data.
    /// </summary>
    /// <returns>Instance of <see cref="IActionResult"/>.</returns>
    protected IActionResult FailureResult()
    {
        Response.StatusCode = (int)HttpStatusCode.BadRequest;
        return new JsonResult(new ResultModel
        {
            Success = false,
        });
    }

    /// <summary>
    /// Return a failure result with additional information.
    /// </summary>
    /// <param name="errorCode">Api error code.</param>
    /// <param name="message">Api error message.</param>
    /// <returns>Instance of <see cref="IActionResult"/>.</returns>
    protected IActionResult FailureResult(string errorCode, string message)
    {
        Response.StatusCode = (int)HttpStatusCode.BadRequest;
        return new JsonResult(new ErrorResultModel
        {
            Error = errorCode,
            Message = message,
        });
    }

    /// <summary>
    /// Returns a failure result indicating the body is missing from the request.
    /// </summary>
    /// <returns>Instance of <see cref="IActionResult"/>.</returns>
    protected IActionResult MissingBodyResult()
    {
        return FailureResult(CoreErrorCodes.NoDataProvided, "Missing request body");
    }

    /// <summary>
    /// Return a success status with no data.
    /// </summary>
    /// <returns>Instance of <see cref="IActionResult"/>.</returns>
    protected IActionResult SuccessResult()
    {
        Response.StatusCode = (int)HttpStatusCode.OK;
        return new JsonResult(new ResultModel
        {
            Success = true,
        });
    }

    /// <summary>
    /// Fetch IP address of requesting agent.
    /// </summary>
    /// <returns>Request origin's IP address.</returns>
    protected IPAddress ClientIpAddress()
    {
        IPAddress remoteIpAddress = null;
        if (Request.Headers.TryGetValue("X-Forwarded-For", out var value))
        {
            foreach (var ip in value)
            {
                if (IPAddress.TryParse(ip, out var address) &&
                    (address.AddressFamily is AddressFamily.InterNetwork
                        or AddressFamily.InterNetworkV6))
                {
                    remoteIpAddress = address;
                    break;
                }
            }
        }
        else
        {
            remoteIpAddress = HttpContext.Connection.RemoteIpAddress?.MapToIPv4();
        }

        return remoteIpAddress;
    }
}