namespace MesETL.App.Options;

/// <summary>
/// 多租户分库配置
/// </summary>
public class TenantDbOptions
{
    public string? TenantKey { get; set; }
    public string? UseDbGroup { get; set; }

    /// <summary>
    /// Key-Value: {DbName}-{TenantKeyLessThan}
    /// </summary>
    public Dictionary<string, int>? DbGroup { get; set; }

    public string GetDbNameByTenantKeyValue(int tenantKeyValue)
    {
        // var dictionary = new SortedDictionary<int, string>();
        // DbList.ForEach(pair => dictionary.Add(pair.Value, pair.Key));
        // 注意配置顺序
        if(DbGroup is null) throw new ApplicationException("分库配置中没有发现任何数据库");

        #region 性能较低，不使用
        
        // var dbName = DbGroup.Cast<KeyValuePair<string, int>?>()
        //     .FirstOrDefault(pair => pair?.Value != null && pair.Value.Value > tenantKeyValue)!.Value.Key;

        #endregion
        
        string? dbName = null;
        foreach (var (key, value) in DbGroup)
        {
            if (value > tenantKeyValue)
            {
                dbName = key;
                break;
            }
        }
        
        return dbName ??
               throw new ArgumentOutOfRangeException(nameof(tenantKeyValue),
                   $"分库配置中没有任何符合'{nameof(tenantKeyValue)}'值的数据库");
    }
}