using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Threading.Tasks;
using UnityEngine;
using System.IO;
using System.Linq;

public class UnityCallPython : MonoBehaviour
{
    public static UnityCallPython instance; 

    Process process;

    /// <summary>
    /// 主体机器人
    /// </summary>
    Robot robot;

    private void Awake()
    {
        instance=this;
        string[] lines = new string[8];
        lines[0] = "home = " + Application.streamingAssetsPath + @"\cxx\Python37";
        lines[1] = "implementation = CPython";
        lines[2] = "version_info = 3.7.8.final.0";
        lines[3] = "virtualenv = 20.24.5";
        lines[4] = "include-system-site-packages = false";
        lines[5] = "base-prefix = " + Application.streamingAssetsPath + @"\cxx\Python37";
        lines[6] = "base-exec-prefix = " + Application.streamingAssetsPath + @"\cxx\Python37";
        lines[7] = "base-executable = "+ Application.streamingAssetsPath + @"\cxx\Python37\python.exe";
        File.WriteAllLines(Application.streamingAssetsPath + @"\cxx\venv\pyvenv.cfg", lines);
    }

    private void OnDestroy()
    {
        if (process != null && !process.HasExited)
        {
            process.Kill();
            process = null;
        }
    }

    /// <summary>
    /// 启动颜色识别
    /// </summary>
    [ContextMenu("启动颜色识别")]
    public void StartColorRead(Robot robot)
    {
        this.robot = robot;
        CallPythonBase();
    }

    /// <summary>
    /// 停止颜色识别
    /// </summary>
    [ContextMenu("停止颜色识别")]
    public void StopColorRead()
    {
        OnDestroy();
    }


    /// <summary>
    /// Unity 调用 Python
    /// </summary>
    /// <param name="pyScriptPath">python 脚本路径</param>
    /// <param name="argvs">python 函数参数</param>
    private void CallPythonBase()
    {
        if (process == null || process.HasExited)
        {
            process = new Process();
            process.StartInfo.FileName = "\"" + Application.streamingAssetsPath + @"\cxx\venv\Scripts\python.exe" + "\"";
            process.StartInfo.UseShellExecute = false;
            process.StartInfo.WorkingDirectory = Application.streamingAssetsPath + @"\cxx\venv\Scripts\cxx";
            process.StartInfo.Arguments = "-u ColorDetect.py";     // 路径+参数
            process.StartInfo.RedirectStandardError = true;
            process.StartInfo.RedirectStandardOutput = true;
            process.StartInfo.CreateNoWindow = true;        // 不显示执行窗口

            process.OutputDataReceived += new DataReceivedEventHandler(GetData);
            process.ErrorDataReceived += new DataReceivedEventHandler(GetError);
            process.Exited += GetExit;

            // 开始执行，获取执行输出，添加结果输出委托
            process.Start();
            Task.Run(() => { ReadPythonData(); });
            process.BeginErrorReadLine();
            UnityEngine.Debug.Log("开始");
        }
    }

    /// <summary>
    /// 读取python输出值
    /// </summary>
    void ReadPythonData()
    {
        //异步
        var task=process.StandardOutput.ReadLineAsync();
        task.Wait();
        if(!string.IsNullOrEmpty(task.Result)) 
        {
            UnityEngine.Debug.Log(task.Result);
            if(robot!=null)
            {
                robot.PlayColorAction(task.Result);
            }
        }
        ReadPythonData();

        //同步
        //while(true)
        //{
        //    string str = process.StandardOutput.ReadLine();
        //    if (!string.IsNullOrEmpty(str))
        //    {
        //        UnityEngine.Debug.Log(str);
        //    }

        //}
    }

    /// <summary>
    /// 输出结果委托
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    void GetData(object sender, DataReceivedEventArgs e)
    {
        UnityEngine.Debug.Log("GetData");

        // 结果不为空才打印（后期可以自己添加类型不同的处理委托）
        if (!string.IsNullOrEmpty(e.Data))
        {
            UnityEngine.Debug.Log(e.Data);
        }
    }

    void GetError(object sender, DataReceivedEventArgs e)
    {
        UnityEngine.Debug.Log("GetError");
        if (!string.IsNullOrEmpty(e.Data))
        {
            UnityEngine.Debug.LogError(e.Data);
        }
    }

    void GetExit(object sender, EventArgs e)
    {
        UnityEngine.Debug.Log("finished.");
    }
}