using System.Text.Json.Nodes;
using Proxd_man.Config.Stream;
using Proxd_man.Config.TransportLayerSecurity;

namespace Proxd_man.Config.Outbound;

/// <summary>
/// 基本的出站代理配置类.
///
/// 所有协议的出站配置都要继承这个类.
/// </summary>
public abstract class BaseOutboundSetting
{
    /// <summary>
    /// 出站配置名称.
    ///
    /// 便于管理的名字, 可以直接从订阅中获取.
    /// </summary>
    public required string Name { get; init; }
    /// <summary>
    /// 发送出站数据所使用的网卡地址.
    /// </summary>
    public string? BindAddress { get; init; }
    /// <summary>
    /// 出站代理协议类型.
    /// </summary>
    public OutboundProtocolType Protocol { get; init; }
    
    public string? Address { get; init; }

    public BaseStreamSetting StreamSetting { get; init; } = new RawStreamSetting();

    public BaseTransportLayerSecuritySetting TransportLayerSecuritySetting { get; init; } = new NoneSecuritySetting();

    public string? NextOutboundTag { get; init; } = null;

    /// <summary>
    /// 根据<a href="https://xtls.github.io/config/outbound.html">Xray-Core 的配置文件格式</a>,
    /// 生成对应的 OutboundObject JSON 配置.
    /// </summary>
    /// <returns></returns>
    public virtual JsonObject ToJsonSetting()
    {
        var root = new JsonObject
        {
            { "protocol", Protocol.ToString().ToLower() },
            { "tag", GetTag() },
            { "settings", GetProtocolSetting() }
        };

        if (!string.IsNullOrEmpty(BindAddress))
        {
            root.Add("sendThrough", BindAddress);
        }
        
        if (!string.IsNullOrEmpty(NextOutboundTag))
        {
            root.Add("proxySettings", new JsonObject
            {
                { "tag", NextOutboundTag }
            });
        }
        else
        {
            var streamSetting = StreamSetting.ToJsonSetting();
            TransportLayerSecuritySetting.ApplyJsonSetting(streamSetting);
            root.Add("streamSettings", streamSetting);
        }
        
        return root;
    }

    /// <summary>
    /// 实现依据配置内容, 生成对应的 Outbound Tag.
    /// </summary>
    /// <returns>返回该 Outbound 的 Tag, 最好唯一.</returns>
    public abstract string GetTag();

    /// <summary>
    /// 实现类依据自身对应协议类型的设定, 生成对应的 V2Ray/Xray-Core Outbound Protocol Setting JSON 对象.
    /// </summary>
    /// <returns>返回协议配置的 JSON 对象.</returns>
    protected abstract JsonObject? GetProtocolSetting();

}