using System;

using System.Collections.Generic;

using System.Net.Http;

using System.Threading.Tasks;

​

//if you see a request failed, it ran out of api requests for the day 

public class SatellitePositionService

{

    private readonly HttpClient _httpClient;

    public SatellitePositionService()

    {

        _httpClient = new HttpClient();

    }

​

    public async Task<string> GetCelestrakTLEData(string satelliteName)

    {

        string apiUrl = "https://celestrak.org/NORAD/elements/gp.php?GROUP=engineering&FORMAT=tle";

        return await GetDataFromApi(apiUrl, "Celestrak");

    }

​

    public async Task<string> GetN2YOTLEData(string noradId)

    {

        string apiUrl = $"https://www.n2yo.com/rest/v1/satellite/tle/39084";

        return await GetDataFromApi(apiUrl, "N2YO");

    }

​

    public async Task<List<string>> GetNASAHorizonsData()

    {

        List<string> planetDataList = new List<string>();

        try

        {

            string[] planetUrls = {"https://ssd.jpl.nasa.gov/api/horizons.api?format=text&COMMAND='899'&OBJ_DATA='YES'&MAKE_EPHEM='YES'&EPHEM_TYPE='OBSERVER'&CENTER='500@399'&START_TIME='2006-01-01'&STOP_TIME='2006-01-20'&STEP_SIZE='1%20d'&QUANTITIES='1,9,20,23,24,29'", "https://ssd.jpl.nasa.gov/api/horizons.api?format=text&COMMAND='799'&OBJ_DATA='YES'&MAKE_EPHEM='YES'&EPHEM_TYPE='OBSERVER'&CENTER='500@399'&START_TIME='2006-01-01'&STOP_TIME='2006-01-20'&STEP_SIZE='1%20d'&QUANTITIES='1,9,20,23,24,29'", "https://ssd.jpl.nasa.gov/api/horizons.api?format=text&COMMAND='699'&OBJ_DATA='YES'&MAKE_EPHEM='YES'&EPHEM_TYPE='OBSERVER'&CENTER='500@399'&START_TIME='2006-01-01'&STOP_TIME='2006-01-20'&STEP_SIZE='1%20d'&QUANTITIES='1,9,20,23,24,29'", "https://ssd.jpl.nasa.gov/api/horizons.api?format=text&COMMAND='599'&OBJ_DATA='YES'&MAKE_EPHEM='YES'&EPHEM_TYPE='OBSERVER'&CENTER='500@399'&START_TIME='2006-01-01'&STOP_TIME='2006-01-20'&STEP_SIZE='1%20d'&QUANTITIES='1,9,20,23,24,29'", "https://ssd.jpl.nasa.gov/api/horizons.api?format=text&COMMAND='499'&OBJ_DATA='YES'&MAKE_EPHEM='YES'&EPHEM_TYPE='OBSERVER'&CENTER='500@399'&START_TIME='2006-01-01'&STOP_TIME='2006-01-20'&STEP_SIZE='1%20d'&QUANTITIES='1,9,20,23,24,29'", "https://ssd.jpl.nasa.gov/api/horizons.api?format=text&COMMAND='399'&OBJ_DATA='YES'&MAKE_EPHEM='YES'&EPHEM_TYPE='OBSERVER'&CENTER='500@399'&START_TIME='2006-01-01'&STOP_TIME='2006-01-20'&STEP_SIZE='1%20d'&QUANTITIES='1,9,20,23,24,29'", "https://ssd.jpl.nasa.gov/api/horizons.api?format=text&COMMAND='299'&OBJ_DATA='YES'&MAKE_EPHEM='YES'&EPHEM_TYPE='OBSERVER'&CENTER='500@399'&START_TIME='2006-01-01'&STOP_TIME='2006-01-20'&STEP_SIZE='1%20d'&QUANTITIES='1,9,20,23,24,29'", "https://ssd.jpl.nasa.gov/api/horizons.api?format=text&COMMAND='199'&OBJ_DATA='YES'&MAKE_EPHEM='YES'&EPHEM_TYPE='OBSERVER'&CENTER='500@399'&START_TIME='2006-01-01'&STOP_TIME='2006-01-20'&STEP_SIZE='1%20d'&QUANTITIES='1,9,20,23,24,29'"};

            foreach (var planetUrl in planetUrls)

            {

                var data = await GetDataFromApi(planetUrl, "NASA HORIZONS");

                planetDataList.Add(data);

            }

​

            return planetDataList;

        }

        catch (Exception ex)

        {

            throw new Exception($"Error retrieving NASA HORIZONS data: {ex.Message}", ex);

        }

    }

​

    private async Task<string> GetDataFromApi(string apiUrl, string sourceName)

    {

        try

        {

            HttpResponseMessage response = await _httpClient.GetAsync(apiUrl);

            if (response.IsSuccessStatusCode)

            {

                string responseData = await response.Content.ReadAsStringAsync();

                if (IsValidResponse(responseData, sourceName))

                {

                    return responseData;

                }

                else

                {

                    throw new DataValidationException($"Invalid or unexpected data format received from {sourceName}.");

                }

            }

            else

            {

                throw new HttpRequestException($"Request to {sourceName} API failed with status code: {response.StatusCode}");

            }

        }

        catch (HttpRequestException ex)

        {

            throw new Exception($"HTTP request error: {ex.Message}", ex);

        }

        catch (DataValidationException ex)

        {

            throw new Exception($"Data validation error: {ex.Message}", ex);

        }

        catch (Exception ex)

        {

            throw new Exception($"An unexpected error occurred: {ex.Message}", ex);

        }

    }

​

    private bool IsValidResponse(string responseData, string sourceName)

    {

        switch (sourceName)

        {

            case "Celestrak":

                string[] lines = responseData.Split('\n');

                const int minLines = 3;

                if (lines.Length < minLines)

                {

                    Console.WriteLine($"Invalid response from {sourceName}. Expected at least {minLines} lines, but got {lines.Length} lines.");

                    Console.WriteLine($"Actual response:\n{responseData}");

                    return false;

                }

​

                for (int i = 0; i < minLines; i++)

                {

                    if (string.IsNullOrWhiteSpace(lines[i]))

                    {

                        Console.WriteLine($"Invalid response from {sourceName}. Line {i + 1} is empty or whitespace.");

                        Console.WriteLine($"Actual response:\n{responseData}");

                        return false;

                    }

                }

​

                if (!responseData.EndsWith("\n"))

                {

                    Console.WriteLine($"Invalid response from {sourceName}. The response does not end with a newline character.");

                    Console.WriteLine($"Actual response:\n{responseData}");

                    return false;

                }

​

                return true;

            case "N2YO":

                if (responseData.Contains("TLE_LINE1") && responseData.Contains("TLE_LINE2"))

                {

                    return true;

                }

                else

                {

                    return false;

                }

​

            case "NASA HORIZONS":

                if (responseData.Contains("API SOURCE: NASA/JPL Horizons API") && responseData.Contains("Revised:"))

                {

                    Console.WriteLine($"Valid response received from {sourceName}. (Planetary Information)");

                    return true;

                }

                else

                {

                    Console.WriteLine($"Invalid response from {sourceName}. Expected headers are not present.");

                    Console.WriteLine($"Actual response:\n{responseData}");

                    return false;

                }

​

            default:

                return true;

        }

    }

}

​

public class DataValidationException : Exception

{

    public DataValidationException(string message) : base(message)

    {

    }

}

​

class Program

{

    static async Task Main()

    {

        SatellitePositionService satelliteService = new SatellitePositionService();

        try

        {

            string celestrakData = await satelliteService.GetCelestrakTLEData("Engineering Satellite");

            Console.WriteLine($"Celestrak Data:\n{celestrakData}");

            var nasaDataList = await satelliteService.GetNASAHorizonsData();

            foreach (var nasaData in nasaDataList)

            {

                Console.WriteLine($"NASA Horizons Data:\n{nasaData}");

            }

​

            string n2yoData = await satelliteService.GetN2YOTLEData("QZEZ47-5KK5WX-VR24YY-558D");

            Console.WriteLine($"N2YO Data:\n{n2yoData}");

        }

        catch (Exception ex)

        {

            Console.WriteLine($"Error: {ex.Message}");

        }

    }

}