using Newtonsoft.Json.Linq;

namespace SHH.CameraService;

public class CommandDispatcher
{
    // 路由表：Key = ActionName, Value = Handler
    private readonly Dictionary<string, ICommandHandler> _handlers;

    // 通过依赖注入拿到所有实现了 ICommandHandler 的类
    public CommandDispatcher(IEnumerable<ICommandHandler> handlers)
    {
        _handlers = handlers.ToDictionary(h => h.ActionName, h => h);
    }

    public async Task DispatchAsync(string jsonMessage)
    {
        try
        {
            var jObj = JObject.Parse(jsonMessage);
            string action = jObj["Action"]?.ToString();
            var payload = jObj["Payload"];

            if (string.IsNullOrEmpty(action)) return;

            // 1. 查找是否有对应的处理器
            if (_handlers.TryGetValue(action, out var handler))
            {
                await handler.ExecuteAsync(payload);
            }
            else if (action == "ACK")
            {
                // ACK 是特殊的，可以直接在这里处理或者忽略
                Console.WriteLine($"[指令] 握手成功: {jObj["Message"]}");
            }
            else
            {
                Console.WriteLine($"[警告] 未知的指令: {action}");
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"[分发错误] {ex.Message}");
        }
    }
}