using Azaion.Common;
using Azaion.Common.Configs;
using Azaion.Common.Database;
using Azaion.Common.Entities;
using LinqToDB;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Options;

namespace Azaion.Services;

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

public class ResourcesService(IOptions<ResourcesConfig> resourcesConfig) : IResourcesService
{
    public async Task<Stream> GetEncryptedResource(string fileName, string key, CancellationToken cancellationToken = default)
    {
        var resourcePath = Path.Combine(resourcesConfig.Value.ResourcesFolder, 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(IFormFile data, CancellationToken cancellationToken = default)
    {
        if (data == null)
            throw new BusinessException(ExceptionEnum.NoFileProvided);
        if (!Directory.Exists(resourcesConfig.Value.ResourcesFolder))
            Directory.CreateDirectory(resourcesConfig.Value.ResourcesFolder);

        var resourcePath = Path.Combine(resourcesConfig.Value.ResourcesFolder, data.FileName);
        await using var fileStream = new FileStream(resourcePath, FileMode.OpenOrCreate, FileAccess.ReadWrite);
        await data.CopyToAsync(fileStream, cancellationToken);
    }
}