using System.Data.HashFunction.FNV;
using System.Globalization;
using System.IO.Abstractions;
using System.Text;
using Recyclarr.Config.Models;
using Recyclarr.Platform;

namespace Recyclarr.Cli.Console.Helpers;

public class CacheStoragePath : ICacheStoragePath
{
    private readonly IAppPaths _paths;
    private readonly IFNV1a _hash;

    public CacheStoragePath(IAppPaths paths)
    {
        _paths = paths;
        _hash = FNV1aFactory.Instance.Create(FNVConfig.GetPredefinedConfig(64));
    }

    private string BuildUniqueServiceDir(IServiceConfiguration config)
    {
        var url = config.BaseUrl.OriginalString;
        return _hash.ComputeHash(Encoding.ASCII.GetBytes(url)).AsHexString();
    }

    private IFileInfo CalculatePathInternal(IServiceConfiguration config, string cacheObjectName, string serviceDir)
    {
        return _paths.CacheDirectory
            .SubDirectory(config.ServiceType.ToString().ToLower(CultureInfo.CurrentCulture))
            .SubDirectory(serviceDir)
            .File(cacheObjectName + ".json");
    }

    public IFileInfo CalculatePath(IServiceConfiguration config, string cacheObjectName)
    {
        return CalculatePathInternal(config, cacheObjectName, BuildUniqueServiceDir(config));
    }
}