using System;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
using TeamAAS.FlowEditor.Models;

namespace TeamAAS.FlowEngine.Execution
{
    /// <summary>
    /// 流程文件持久化（.aas）。
    /// 使用 BinaryFormatter 二进制序列化——CogToolBlock 等 Cognex 对象
    /// 实现了 ISerializable，可跟着 FlowGraph 一起完整序列化/反序列化。
    /// </summary>
    public static class FlowFileStore
    {
        /// <summary>
        /// 保存流程图（二进制）。失败返回 false 并写日志。
        /// </summary>
        public static bool Save(FlowGraph graph, string path)
        {
            if (graph == null || string.IsNullOrEmpty(path)) return false;
            try
            {
                var dir = Path.GetDirectoryName(path);
                if (!string.IsNullOrEmpty(dir) && !Directory.Exists(dir))
                    Directory.CreateDirectory(dir);

#pragma warning disable SYSLIB0011
                var formatter = new BinaryFormatter();
                using (var stream = new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.None))
                {
                    formatter.Serialize(stream, graph);
                }
#pragma warning restore SYSLIB0011
                return true;
            }
            catch (Exception ex)
            {
                AppLogger.Error($"流程保存失败: {path}", ex, nameof(FlowFileStore));
                return false;
            }
        }

        /// <summary>
        /// 加载流程图（二进制）。
        /// </summary>
        public static FlowGraph Load(string path)
        {
            if (string.IsNullOrEmpty(path) || !File.Exists(path)) return null;

            try
            {
#pragma warning disable SYSLIB0011
                var formatter = new BinaryFormatter();
                // 绑定器：算子程序集迁移后旧流程仍可加载（未命中映射时与默认行为完全一致）
                formatter.Binder = FlowSerializationBinder.Instance;
                using (var stream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.None))
                {
                    return (FlowGraph)formatter.Deserialize(stream);
                }
#pragma warning restore SYSLIB0011
            }
            catch (Exception ex)
            {
                AppLogger.Error($"流程加载失败: {path}", ex, nameof(FlowFileStore));
                return null;
            }
        }
    }
}