using Microsoft.Extensions.Configuration.Ini;
using Microsoft.Extensions.Configuration.Json;

namespace SQLInsight.Agent;

/// <summary>
/// sqlinsight.ini, written by the MSI installer from the values given at install time (connection string, port …).
/// It is read right after appsettings.json, so it overrides the examples there, while appsettings.{Environment}.json,
/// environment variables and the command line still override it.
/// </summary>
public static class InstallerSettings
{
    public const string FileName = "sqlinsight.ini";

    public static void Add(IConfigurationBuilder configuration, string directory)
    {
        ArgumentNullException.ThrowIfNull(configuration);
        var source = new IniConfigurationSource { Path = Path.Combine(directory, FileName), Optional = true, ReloadOnChange = false };
        source.ResolveFileProvider();
        var appsettings = configuration.Sources
            .Select((s, i) => (Source: s, Index: i))
            .LastOrDefault(x => x.Source is JsonConfigurationSource json && string.Equals(json.Path, "appsettings.json", StringComparison.OrdinalIgnoreCase));
        if (appsettings.Source is null)
        {
            configuration.Add(source);
        }
        else
        {
            configuration.Sources.Insert(appsettings.Index + 1, source);
        }
    }
}