using System;
using System.IO;
using System.Net.Http;
using System.Text.Json;
using System.Threading.Tasks;
using DysonNetwork.Common.Interfaces;
using DysonNetwork.Common.Models;
using Microsoft.Extensions.Logging;
using NodaTime;
using NodaTime.Serialization.SystemTextJson;

namespace DysonNetwork.Common.Clients
{
    public class FileServiceClient : IFileServiceClient, IDisposable
    {
        private readonly HttpClient _httpClient;
        private readonly ILogger<FileServiceClient> _logger;
        private readonly JsonSerializerOptions _jsonOptions;

        public FileServiceClient(HttpClient httpClient, ILogger<FileServiceClient> logger)
        {
            _httpClient = httpClient ?? throw new ArgumentNullException(nameof(httpClient));
            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
            _jsonOptions = new JsonSerializerOptions().ConfigureForNodaTime(DateTimeZoneProviders.Tzdb);
            _jsonOptions.PropertyNameCaseInsensitive = true;
        }

        public async Task<CloudFile> GetFileAsync(string fileId)
        {
            var response = await _httpClient.GetAsync($"api/files/{fileId}");
            response.EnsureSuccessStatusCode();
            
            await using var stream = await response.Content.ReadAsStreamAsync();
            var file = await JsonSerializer.DeserializeAsync<CloudFile>(stream, _jsonOptions);
            return file;
        }

        public async Task<Stream> GetFileStreamAsync(string fileId)
        {
            if (string.IsNullOrEmpty(fileId))
                throw new ArgumentNullException(nameof(fileId));
                
            var response = await _httpClient.GetAsync($"api/files/{fileId}/download");
            response.EnsureSuccessStatusCode();
            
            var stream = await response.Content.ReadAsStreamAsync();
            if (stream == null)
                throw new InvalidOperationException("Failed to read file stream from response.");
                
            return stream;
        }

        public async Task<CloudFile> UploadFileAsync(Stream fileStream, string fileName, string? contentType = null)
        {
            using var content = new MultipartFormDataContent();
            var fileContent = new StreamContent(fileStream);
            if (!string.IsNullOrEmpty(contentType))
            {
                fileContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue(contentType);
            }
            content.Add(fileContent, "file", fileName);
            
            var response = await _httpClient.PostAsync("api/files/upload", content);
            response.EnsureSuccessStatusCode();
            
            await using var responseStream = await response.Content.ReadAsStreamAsync();
            var file = await JsonSerializer.DeserializeAsync<CloudFile>(responseStream, _jsonOptions);
            return file;
        }
        
        public async Task<CloudFile> ProcessImageAsync(Stream imageStream, string fileName, string? contentType = null)
        {
            using var content = new MultipartFormDataContent();
            var fileContent = new StreamContent(imageStream);
            if (!string.IsNullOrEmpty(contentType))
            {
                fileContent.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue(contentType);
            }
            content.Add(fileContent, "image", fileName);
            
            var response = await _httpClient.PostAsync("api/files/process-image", content);
            response.EnsureSuccessStatusCode();
            
            await using var responseStream = await response.Content.ReadAsStreamAsync();
            var file = await JsonSerializer.DeserializeAsync<CloudFile>(responseStream, _jsonOptions);
            return file;
        }
        
        public async Task<string> GetFileUrl(string fileId, bool useCdn = false)
        {
            var url = $"api/files/{fileId}/url";
            if (useCdn)
            {
                url += "?useCdn=true";
            }
            
            var response = await _httpClient.GetAsync(url);
            response.EnsureSuccessStatusCode();
            
            var result = await response.Content.ReadAsStringAsync();
            return result.Trim('"');
        }

        public async Task DeleteFileAsync(string fileId)
        {
            var response = await _httpClient.DeleteAsync($"api/files/{fileId}");
            response.EnsureSuccessStatusCode();
        }

        public void Dispose()
        {
            _httpClient?.Dispose();
            GC.SuppressFinalize(this);
        }
    }
}