/*
* Copyright (c) 2024 Vaughn Nugent
* 
* Library: VNLib
* Package: VNLib.Plugins.Essentials.Sessions.OAuth
* File: O2SessionProviderEntry.cs 
*
* O2SessionProviderEntry.cs is part of VNLib.Plugins.Essentials.Sessions.OAuth which is part of the larger 
* VNLib collection of libraries and utilities.
*
* VNLib.Plugins.Essentials.Sessions.OAuth is free software: you can redistribute it and/or modify 
* it under the terms of the GNU Affero General Public License as 
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* VNLib.Plugins.Essentials.Sessions.OAuth is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program.  If not, see https://www.gnu.org/licenses/.
*/

using System;
using System.Text.Json.Serialization;

using VNLib.Plugins.Extensions.Loading;


namespace VNLib.Plugins.Sessions.OAuth
{
    sealed class OAuth2SessionConfig : IOnConfigValidation
    {
        [JsonPropertyName("max_tokens_per_app")]
        public int MaxTokensPerApp { get; set; } = 10;

        [JsonPropertyName("access_token_size")]
        public int AccessTokenSize { get; set; } = 64;

        [JsonPropertyName("token_valid_for_sec")]
        public int TokenLifeTimeSeconds { get; set; } = 3600;

        [JsonPropertyName("cache_prefix")]
        public string CachePrefix { get; set; } = "oauth2";

        [JsonPropertyName("access_token_type")]
        public string TokenType { get; set; } = "Bearer";

        public void Validate()
        {
            if (MaxTokensPerApp < 1)
            {
                throw new ArgumentOutOfRangeException("max_tokens_per_app", "You must configure at least 1 Oatuh2 access token per application, or disable this plugin");
            }

            if (AccessTokenSize < 16)
            {
                throw new ArgumentOutOfRangeException("access_token_size", "You must configure an access token size of at least 16 bytes in length");
            }

            if (TokenLifeTimeSeconds < 1)
            {
                throw new ArgumentOutOfRangeException("token_valid_for_sec", "You must configure an access token lifetime");
            }

            if (string.IsNullOrWhiteSpace(CachePrefix))
            {
                throw new ArgumentException("You must specify a cache prefix", "cache_prefix");
            }
        }
    }
}