using Microsoft.Extensions.Configuration;

namespace Deal.Storage.Options;

/// <summary>
/// Настройки объектного хранилища сервиса данных.
/// </summary>
public sealed class StorageOptions
{
    /// <summary>
    /// Значение бакета по умолчанию.
    /// </summary>
    public const string DefaultBucketName = "deal-attachments";

    /// <summary>
    /// Env-ключ адреса хранилища (host:port).
    /// </summary>
    public const string EndpointEnvKey = "DEAL_STORAGE_ENDPOINT";

    /// <summary>
    /// Env-ключ ключа доступа.
    /// </summary>
    public const string AccessKeyEnvKey = "DEAL_STORAGE_ACCESS_KEY";

    /// <summary>
    /// Env-ключ секрета доступа.
    /// </summary>
    public const string SecretKeyEnvKey = "DEAL_STORAGE_SECRET_KEY";

    /// <summary>
    /// Env-ключ имени бакета.
    /// </summary>
    public const string BucketEnvKey = "DEAL_STORAGE_BUCKET";

    /// <summary>
    /// Env-ключ флага TLS (1/true — https).
    /// </summary>
    public const string SecureEnvKey = "DEAL_STORAGE_SECURE";

    private const string TrueLiteral = "true";

    public string Endpoint { get; init; } = string.Empty;

    public string AccessKey { get; init; } = string.Empty;

    public string SecretKey { get; init; } = string.Empty;

    public string Bucket { get; init; } = DefaultBucketName;

    public bool Secure { get; init; }

    /// <summary>
    /// Читает настройки из конфигурации хоста.
    /// </summary>
    public static StorageOptions FromConfiguration(IConfiguration configuration)
    {
        ArgumentNullException.ThrowIfNull(configuration);
        string bucket = (configuration[BucketEnvKey] ?? string.Empty).Trim();
        return new StorageOptions
        {
            Endpoint = (configuration[EndpointEnvKey] ?? string.Empty).Trim(),
            AccessKey = (configuration[AccessKeyEnvKey] ?? string.Empty).Trim(),
            SecretKey = configuration[SecretKeyEnvKey] ?? string.Empty,
            Bucket = bucket.Length == 0 ? DefaultBucketName : bucket,
            Secure = IsEnabled(configuration[SecureEnvKey]),
        };
    }

    /// <summary>
    /// Разбирает значение флага TLS.
    /// </summary>
    public static bool IsEnabled(string? rawValue)
        => string.Equals(rawValue, "1", StringComparison.Ordinal)
           || string.Equals(rawValue, TrueLiteral, StringComparison.OrdinalIgnoreCase);
}