using Bit.Core.Settings;
using LaunchDarkly.Sdk.Server;
using LaunchDarkly.Sdk.Server.Integrations;

namespace Bit.Core.Services;

public class LaunchDarklyFeatureService : IFeatureService, IDisposable
{
    private readonly LdClient _client;

    public LaunchDarklyFeatureService(
        IGlobalSettings globalSettings)
    {
        var ldConfig = Configuration.Builder(globalSettings.LaunchDarkly?.SdkKey);

        if (string.IsNullOrEmpty(globalSettings.LaunchDarkly?.SdkKey))
        {
            // support a file to load flag values
            if (File.Exists(globalSettings.LaunchDarkly?.FlagDataFilePath))
            {
                ldConfig.DataSource(
                    FileData.DataSource()
                        .FilePaths(globalSettings.LaunchDarkly?.FlagDataFilePath)
                        .AutoUpdate(true)
                );

                // do not provide analytics events
                ldConfig.Events(Components.NoEvents);
            }
            else
            {
                // when a file-based fallback isn't available, work offline
                ldConfig.Offline(true);
            }
        }
        else if (globalSettings.SelfHosted)
        {
            // when self-hosted, work offline
            ldConfig.Offline(true);
        }

        _client = new LdClient(ldConfig.Build());
    }

    public bool IsOnline()
    {
        return _client.Initialized && !_client.IsOffline();
    }

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