using CMSMicroservice.Application.Common.Interfaces;
using CMSMicroservice.Protobuf.Protos.FMS;
using Google.Protobuf;
using Grpc.Net.Client;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Formats.Jpeg;
using SixLabors.ImageSharp.Processing;
using System.IO;

namespace CMSMicroservice.Infrastructure.Services;

public class FileManagementService : IFileManagementService, IDisposable
{
    private readonly ILogger<FileManagementService> _logger;
    private readonly FileInfoContract.FileInfoContractClient _client;
    private readonly GrpcChannel _channel;

    private const int MainImageMaxWidth = 1200;
    private const int MainImageMaxHeight = 1200;
    private const int ThumbnailMaxWidth = 300;
    private const int ThumbnailMaxHeight = 300;
    private const int JpegQuality = 75;

    public FileManagementService(IConfiguration configuration, ILogger<FileManagementService> logger)
    {
        _logger = logger;
        
        var fmsAddress = configuration["FMS:Address"] ?? "https://dl.afrino.co";
        
        _channel = GrpcChannel.ForAddress(fmsAddress, new GrpcChannelOptions
        {
            MaxReceiveMessageSize = 100 * 1024 * 1024, // 100 MB
            MaxSendMessageSize = 100 * 1024 * 1024
        });
        
        _client = new FileInfoContract.FileInfoContractClient(_channel);
    }

    public async Task<string?> UploadFileAsync(string directory, byte[] fileBytes, string mime, string? fileName, 
        CancellationToken cancellationToken = default)
    {
        try
        {
            var request = new CreateNewFileInfoRequest
            {
                Directory = directory,
                File = ByteString.CopyFrom(fileBytes),
                Mime = mime,
                IsBase64 = false
            };
            
            if (!string.IsNullOrWhiteSpace(fileName))
                request.FileName = fileName;

            var response = await _client.CreateNewFileInfoAsync(request, cancellationToken: cancellationToken);
            
            if (response != null && !string.IsNullOrWhiteSpace(response.File))
            {
                _logger.LogInformation("File uploaded to FMS successfully. Id: {Id}, Path: {Path}", response.Id, response.File);
                return response.File;
            }
            
            _logger.LogWarning("FMS upload returned null or empty path for file: {FileName}", fileName);
            return null;
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error uploading file to FMS. Directory: {Directory}, FileName: {FileName}", directory, fileName);
            return null;
        }
    }

    public async Task<(string? MainImagePath, string? ThumbnailPath)> UploadImageWithThumbnailAsync(
        string directory, byte[] fileBytes, string mime, string? fileName,
        CancellationToken cancellationToken = default)
    {
        string? mainImagePath = null;
        string? thumbnailPath = null;

        try
        {
            // Optimize main image
            var mainImageBytes = await OptimizeImageAsync(fileBytes, MainImageMaxWidth, MainImageMaxHeight);
            mainImagePath = await UploadFileAsync(directory, mainImageBytes, "image/jpeg", fileName, cancellationToken);

            // Create and upload thumbnail
            var thumbnailBytes = await OptimizeImageAsync(fileBytes, ThumbnailMaxWidth, ThumbnailMaxHeight);
            var thumbFileName = fileName != null ? $"thumb_{fileName}" : null;
            thumbnailPath = await UploadFileAsync($"{directory}/Thumbnails", thumbnailBytes, "image/jpeg", thumbFileName, cancellationToken);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error processing and uploading image with thumbnail. Directory: {Directory}", directory);
        }

        return (mainImagePath, thumbnailPath);
    }

    public async Task<bool> DeleteFileAsync(long fileId, CancellationToken cancellationToken = default)
    {
        try
        {
            var request = new DeleteFileInfoRequest { Id = fileId };
            var response = await _client.DeleteFileInfoAsync(request, cancellationToken: cancellationToken);
            return response?.Success ?? false;
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error deleting file from FMS. FileId: {FileId}", fileId);
            return false;
        }
    }

    private static async Task<byte[]> OptimizeImageAsync(byte[] imageBytes, int maxWidth, int maxHeight)
    {
        using var image = Image.Load(imageBytes);
        
        // Only resize if larger than max dimensions
        if (image.Width > maxWidth || image.Height > maxHeight)
        {
            image.Mutate(x => x.Resize(new ResizeOptions
            {
                Size = new Size(maxWidth, maxHeight),
                Mode = ResizeMode.Max
            }));
        }

        using var ms = new MemoryStream();
        await image.SaveAsJpegAsync(ms, new JpegEncoder { Quality = JpegQuality });
        return ms.ToArray();
    }

    public void Dispose()
    {
        _channel?.Dispose();
    }
}