using DeluxeBackend.Models;
using System.Net.Http.Headers;
using System.Numerics;
using System.Security.Claims;
using System.Security.Cryptography;
using System.Text;

namespace DeluxeBackend.Services
{

    public interface ICdnService
    {
        Task<string?> UploadFile(Stream fileStream, string filePath);
        Task<string?> UploadFile(Stream fileStream, string filePath, string fileName);
        Task<(string? Url, string? Proof)> UploadFile(Stream fileStream, string filePath, Account account);
    }

    public class CdnService(HttpClient httpClient) : ICdnService
    {
        public static readonly string Url = "http://127.0.0.1:9823/";

        private static readonly string apiUrl = "http://127.0.0.1:9823/api/internal/v1/upload";
        private readonly string apiKey = "KittyRec_6767_1b9b24fe-eb5a-486b-af29-dba01b8de861";
        private static readonly string proofSecret = "SUPER_SECRET_OWNERSHIP_SIGNING_KEY_12345";


        public async Task<string?> UploadFile(Stream fileStream, string filePath)
        {
            try
            {
                using var request = new HttpRequestMessage(HttpMethod.Post, apiUrl);

                request.Headers.Add("X-API-KEY", apiKey);

                var content = new MultipartFormDataContent();

                var fileContent = new StreamContent(fileStream);
                fileContent.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
                content.Add(fileContent, "file", "data.bin");

                content.Add(new StringContent(filePath), "type");

                request.Content = content;

                var response = await httpClient.SendAsync(request);

                if (response.IsSuccessStatusCode)
                {
                    return await response.Content.ReadAsStringAsync();
                }

                return null;
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Upload failed: {ex.Message}");
                return null;
            }
        }

        internal static string GenerateOwnershipProof(Account account, string fileName)
        {
            var payload = $"{Environment.MachineName}:{account.Id}:{account.CreatedAt.Ticks}:{fileName}";
            using var hmac = new HMACSHA256(Encoding.UTF8.GetBytes(proofSecret));
            var hash = hmac.ComputeHash(Encoding.UTF8.GetBytes(payload));
            return Convert.ToBase64String(hash);
        }
        public async Task<string?> UploadFile(Stream fileStream, string filePath, string fileName)
        {
            try
            {
                using var request = new HttpRequestMessage(HttpMethod.Post, apiUrl);

                request.Headers.Add("X-API-KEY", apiKey);

                var content = new MultipartFormDataContent();

                var fileContent = new StreamContent(fileStream);
                fileContent.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
                content.Add(fileContent, "file", "data.bin");

                content.Add(new StringContent(filePath), "type");
                content.Add(new StringContent(fileName), "filename");

                request.Content = content;

                var response = await httpClient.SendAsync(request);

                if (response.IsSuccessStatusCode)
                {
                    return await response.Content.ReadAsStringAsync();
                }

                return null;
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Upload failed: {ex.Message}");
                return null;
            }
        }

        public async Task<(string? Url, string? Proof)> UploadFile(Stream fileStream, string filePath, Account account)
        {
            try
            {
                using var request = new HttpRequestMessage(HttpMethod.Post, apiUrl);

                request.Headers.Add("X-API-KEY", apiKey);

                var content = new MultipartFormDataContent();

                var fileContent = new StreamContent(fileStream);
                fileContent.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
                content.Add(fileContent, "file", "data.bin");

                content.Add(new StringContent(filePath), "type");

                request.Content = content;

                var response = await httpClient.SendAsync(request);

                if (response.IsSuccessStatusCode)
                {
                    if (response.IsSuccessStatusCode)
                    {
                        string fileName = await response.Content.ReadAsStringAsync();
                        string proof = GenerateOwnershipProof(account, fileName);

                        return (fileName, proof);
                    }

                }


                return (null, null);
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Upload failed: {ex.Message}");
                return (null, null);
            }
        }

        
    }
}