using Azaion.Common;
using Azaion.Common.Configs;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;

namespace Azaion.Services;

public interface IResourcesService
{
    Task<Stream> GetEncryptedResource(string? dataFolder, string fileName, string key, CancellationToken cancellationToken = default);
    Task SaveResource(string? dataFolder, IFormFile data, CancellationToken cancellationToken = default);
}

public class ResourcesService(IOptions<ResourcesConfig> resourcesConfig, ILogger<ResourcesService> logger) : IResourcesService
{
    public async Task<Stream> GetEncryptedResource(string? dataFolder, string fileName, string key, CancellationToken cancellationToken = default)
    {
        var resourcePath = string.IsNullOrWhiteSpace(dataFolder)
                ? Path.Combine(resourcesConfig.Value.ResourcesFolder, fileName)
                : Path.Combine(resourcesConfig.Value.ResourcesFolder, dataFolder, fileName);
        var fileStream = new FileStream(resourcePath, FileMode.Open, FileAccess.Read);

        var ms = new MemoryStream();
        await fileStream.EncryptTo(ms, key, cancellationToken);
        ms.Seek(0, SeekOrigin.Begin);
        return ms;
    }

    public async Task SaveResource(string? dataFolder, IFormFile data, CancellationToken cancellationToken = default)
    {
        if (data == null)
            throw new BusinessException(ExceptionEnum.NoFileProvided);

        var resourceFolder = string.IsNullOrWhiteSpace(dataFolder)
            ? resourcesConfig.Value.ResourcesFolder
            : Path.Combine(resourcesConfig.Value.ResourcesFolder, dataFolder);

        if (!Directory.Exists(resourceFolder))
            Directory.CreateDirectory(resourceFolder);

        var resourcePath = Path.Combine(resourceFolder, data.FileName);
        await using var fileStream = new FileStream(resourcePath, FileMode.OpenOrCreate, FileAccess.ReadWrite);
        await data.CopyToAsync(fileStream, cancellationToken);
        logger.LogInformation($"Resource {data.FileName} Saved Successfully");
    }
}