using UnityEngine;
using UnityEngine.UI;
using System.IO;
using System.Text.RegularExpressions;
using System;
using System.Text;
using System.Runtime.InteropServices;

public class readDeviceInfo : MonoBehaviour
{
    public Button reread_button;
    public Button export_button;
    public Text deviceInfo_text;

    void Start()
    {
        if (reread_button != null)
        {
            reread_button.onClick.AddListener(read_deviceInfo);
        }

        if (export_button != null)
        {
            export_button.onClick.AddListener(ExportToFile);
        }

        if (deviceInfo_text != null)
            deviceInfo_text.supportRichText = true;

        read_deviceInfo();
    }

    void OnDestroy()
    {
        if (reread_button != null)
            reread_button.onClick.RemoveListener(read_deviceInfo);
        if (export_button != null)
            export_button.onClick.RemoveListener(ExportToFile);
    }

    void Update()
    {

    }

    private void read_deviceInfo()
    {
        System.Text.StringBuilder sb = new System.Text.StringBuilder();

        void AddEntry(string title, object value)
        {
            string str;
            if (value == null) str = "";
            else if (value is bool b) str = b ? "启用" : "禁用";
            else str = value.ToString();

            sb.AppendLine($"<b>{title}</b>");
            sb.AppendLine(str);
            sb.AppendLine();
        }

        AddEntry("平台", Application.platform.ToString());
        AddEntry("运行目录", Application.dataPath);
        AddEntry("persistent 数据路径", Application.persistentDataPath);

        AddEntry("操作系统", SystemInfo.operatingSystem);
        AddEntry("设备名称", SystemInfo.deviceName);
        AddEntry("设备型号", SystemInfo.deviceModel);
        AddEntry("设备唯一ID", SystemInfo.deviceUniqueIdentifier);

        AddEntry("CPU", SystemInfo.processorType);
        AddEntry("CPU核心数", SystemInfo.processorCount);
        AddEntry("系统内存 (MB)", SystemInfo.systemMemorySize);

        AddEntry("图形设备名称", SystemInfo.graphicsDeviceName);
        AddEntry("图形设备供应商", SystemInfo.graphicsDeviceVendor);
        AddEntry("DirectX", SystemInfo.graphicsDeviceType.ToString());
        AddEntry("显存 (MB)", SystemInfo.graphicsMemorySize);

        AddEntry("屏幕分辨率", $"{Screen.currentResolution.width} x {Screen.currentResolution.height} @ {Screen.currentResolution.refreshRate}Hz");
        AddEntry("屏幕DPI", Screen.dpi);
        AddEntry("显示模式", Screen.fullScreenMode.ToString());

        try
        {
            AddEntry("电池电量", $"{SystemInfo.batteryLevel * 100:F0}%");
        }
        catch
        {
            AddEntry("电池状态", "不支持");
        }

        AddEntry("浮动·本索尼克谱面编辑器", "v1.1h02e");
        AddEntry("浮动·浮动小游戏引擎", "v1.301");
        AddEntry("本游戏版本号", "code::testingVersion1062");
        AddEntry("登录渠道", "Steam Client");

        AddEntry(".NET Framework", "8.0 +");
        AddEntry("最大纹理尺寸", SystemInfo.maxTextureSize);

        AddEntry("禁用后台运行", Application.runInBackground);
        AddEntry("多线程渲染", SystemInfo.graphicsMultiThreaded);

        string output = sb.ToString();

        if (deviceInfo_text != null)
        {
            deviceInfo_text.text = output;
        }
    }

    void ExportToFile()
    {
        if (deviceInfo_text == null)
        {
            return;
        }

        string path = ShowSaveFileDialog();
        if (string.IsNullOrEmpty(path))
        {
            return;
        }

        try
        {
            string raw = deviceInfo_text.text;
            // Remove <b> tags and add colon after title
            string cleaned = Regex.Replace(raw, "<b>(.*?)</b>", "$1:");
            File.WriteAllText(path, cleaned);
        }
        catch (System.Exception)
        {
        }
    }

    string ShowSaveFileDialog()
    {
#if UNITY_EDITOR
        string desktop = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
        string path = UnityEditor.EditorUtility.SaveFilePanel("保存设备信息", desktop, "device_info", "txt");
        return string.IsNullOrEmpty(path) ? null : path;
#elif UNITY_STANDALONE_WIN
        try
        {
            // Use native Windows SaveFile dialog via comdlg32 GetSaveFileName
            OpenFileName ofn = new OpenFileName();
            ofn.structSize = Marshal.SizeOf(ofn);
            ofn.filter = "Text files (*.txt)\0*.txt\0All files (*.*)\0*.*\0";
            ofn.file = new string('\0', 260);
            ofn.maxFile = ofn.file.Length;
            ofn.fileTitle = new string('\0', 260);
            ofn.maxFileTitle = ofn.fileTitle.Length;
            ofn.initialDir = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
            ofn.title = "保存设备信息";
            ofn.defExt = "txt";
            ofn.flags = OpenFileNameFlags.OFN_OVERWRITEPROMPT;

            if (GetSaveFileName(ofn))
            {
                // Trim any trailing nulls
                return ofn.file.TrimEnd('\0');
            }
        }
        catch (Exception)
        {
        }

        return null;
#else
        string defaultPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "device_info.txt");
        return defaultPath;
#endif
    }

#if UNITY_STANDALONE_WIN
    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
    private class OpenFileName
    {
        public int structSize = 0;
        public IntPtr dlgOwner = IntPtr.Zero;
        public IntPtr instance = IntPtr.Zero;
        public string filter = null;
        public string customFilter = null;
        public int maxCustFilter = 0;
        public int filterIndex = 0;
        public string file = null;
        public int maxFile = 0;
        public string fileTitle = null;
        public int maxFileTitle = 0;
        public string initialDir = null;
        public string title = null;
        public int flags = 0;
        public short fileOffset = 0;
        public short fileExtension = 0;
        public string defExt = null;
        public IntPtr custData = IntPtr.Zero;
        public IntPtr hook = IntPtr.Zero;
        public string templateName = null;
        public IntPtr reservedPtr = IntPtr.Zero;
        public int reservedInt = 0;
        public int flagsEx = 0;
    }

    private static class OpenFileNameFlags
    {
        public const int OFN_OVERWRITEPROMPT = 0x00000002;
    }

    [DllImport("comdlg32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern bool GetSaveFileName([In, Out] OpenFileName ofn);
#endif
}