using Azaion.Common;
using Azaion.Common.Configs;
using Azaion.Common.Entities;
using Azaion.Common.Requests;
using Microsoft.Extensions.Options;

namespace Azaion.Services;

public interface IResourcesService
{
    Task GetEncryptedResource(ResourceEnum resource, string key, Stream outputStream, CancellationToken cancellationToken = default);
    Task SaveResource(UploadResourceRequest request, CancellationToken cancellationToken = default);
}

public class ResourcesService(IOptions<ResourcesConfig> resourcesConfig) : IResourcesService
{
    public async Task GetEncryptedResource(ResourceEnum resource, string key, Stream outputStream, CancellationToken cancellationToken = default)
    {
        var fileStream = new FileStream(GetResourcePath(resource), FileMode.Open, FileAccess.Read);
        await fileStream.EncryptTo(outputStream, key, cancellationToken);
    }

    public async Task SaveResource(UploadResourceRequest request, CancellationToken cancellationToken = default)
    {
        await using var fileStream = new FileStream(GetResourcePath(request.ResourceEnum), FileMode.OpenOrCreate, FileAccess.ReadWrite);
        await request.Data.CopyToAsync(fileStream, cancellationToken);
    }

    private string GetResourcePath(ResourceEnum resourceEnum)
    {
        var resource = resourcesConfig.Value.Resources.GetValueOrDefault(resourceEnum.ToString());
        if (resource == null)
            throw new BusinessException(ExceptionEnum.WrongResourceType, "Wrong resource type!");
        return Path.Combine(resourcesConfig.Value.ResourcesFolder, resource);
    }
}