namespace Campaign_Tracker.Server.Configuration;

public static class DotEnvConfiguration
{
    public static void Load(ConfigurationManager configuration, string contentRootPath)
    {
        var rootEnvPath = Path.GetFullPath(Path.Combine(contentRootPath, "..", ".env"));
        var serverEnvPath = Path.Combine(contentRootPath, ".env");
        var values = new Dictionary<string, string?>(StringComparer.OrdinalIgnoreCase);

        AddFileValues(rootEnvPath, values);
        AddFileValues(serverEnvPath, values);

        if (values.Count > 0)
        {
            configuration.AddInMemoryCollection(values);
        }
    }

    private static void AddFileValues(string path, IDictionary<string, string?> values)
    {
        if (!File.Exists(path))
        {
            return;
        }

        foreach (var line in File.ReadLines(path))
        {
            var trimmed = line.Trim();
            if (trimmed.Length == 0 || trimmed.StartsWith('#'))
            {
                continue;
            }

            var separatorIndex = trimmed.IndexOf('=');
            if (separatorIndex <= 0)
            {
                continue;
            }

            var key = trimmed[..separatorIndex].Trim().Replace("__", ":");
            var value = trimmed[(separatorIndex + 1)..].Trim();
            values[key] = Unquote(value);
        }
    }

    private static string Unquote(string value)
    {
        if (value.Length >= 2 &&
            ((value.StartsWith('"') && value.EndsWith('"')) ||
             (value.StartsWith('\'') && value.EndsWith('\''))))
        {
            return value[1..^1];
        }

        return value;
    }
}