using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Text.Json;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Win32;

namespace AxCopilot.Services.Agent;

public class DevEnvDetectTool : IAgentTool
{
	private static (DateTime Time, string Result)? _cache;

	public string Name => "dev_env_detect";

	public string Description => "Detect installed development tools on this machine. Returns: IDEs (VS Code, Visual Studio, IntelliJ, PyCharm), language runtimes (dotnet, python/conda, java, node, gcc/g++), and build tools (MSBuild, Maven, Gradle, CMake, npm/yarn). Use this before running build/test commands to know what's available.";

	public ToolParameterSchema Parameters
	{
		get
		{
			ToolParameterSchema toolParameterSchema = new ToolParameterSchema();
			Dictionary<string, ToolProperty> dictionary = new Dictionary<string, ToolProperty>();
			ToolProperty obj = new ToolProperty
			{
				Type = "string",
				Description = "Detection category: all (default), ides, runtimes, build_tools"
			};
			int num = 4;
			List<string> list = new List<string>(num);
			CollectionsMarshal.SetCount(list, num);
			Span<string> span = CollectionsMarshal.AsSpan(list);
			span[0] = "all";
			span[1] = "ides";
			span[2] = "runtimes";
			span[3] = "build_tools";
			obj.Enum = list;
			dictionary["category"] = obj;
			toolParameterSchema.Properties = dictionary;
			toolParameterSchema.Required = new List<string>();
			return toolParameterSchema;
		}
	}

	public Task<ToolResult> ExecuteAsync(JsonElement args, AgentContext context, CancellationToken ct)
	{
		JsonElement value;
		string text = (args.TryGetProperty("category", out value) ? (value.GetString() ?? "all") : "all");
		if (_cache.HasValue && (DateTime.UtcNow - _cache.Value.Time).TotalSeconds < 60.0)
		{
			return Task.FromResult(ToolResult.Ok(_cache.Value.Result));
		}
		StringBuilder stringBuilder = new StringBuilder();
		stringBuilder.AppendLine("=== 개발 환경 감지 보고서 ===\n");
		if ((text == "all" || text == "ides") ? true : false)
		{
			stringBuilder.AppendLine("## IDE");
			DetectIde(stringBuilder, "VS Code", DetectVsCode);
			DetectIde(stringBuilder, "Visual Studio", DetectVisualStudio);
			DetectIde(stringBuilder, "IntelliJ IDEA", () => DetectJetBrains("IntelliJ"));
			DetectIde(stringBuilder, "PyCharm", () => DetectJetBrains("PyCharm"));
			stringBuilder.AppendLine();
		}
		if ((text == "all" || text == "runtimes") ? true : false)
		{
			stringBuilder.AppendLine("## Language Runtimes");
			DetectCommand(stringBuilder, "dotnet", "dotnet --version", "DOTNET_ROOT");
			DetectCommand(stringBuilder, "python", "python --version", "PYTHON_HOME");
			DetectCommand(stringBuilder, "conda", "conda --version", "CONDA_PREFIX");
			DetectCommand(stringBuilder, "java", "java -version", "JAVA_HOME");
			DetectCommand(stringBuilder, "node", "node --version", "NODE_HOME");
			DetectCommand(stringBuilder, "npm", "npm --version", null);
			DetectCommand(stringBuilder, "gcc", "gcc --version", null);
			DetectCommand(stringBuilder, "g++", "g++ --version", null);
			stringBuilder.AppendLine();
		}
		if ((text == "all" || text == "build_tools") ? true : false)
		{
			stringBuilder.AppendLine("## Build Tools");
			DetectCommand(stringBuilder, "MSBuild", "msbuild -version", null);
			DetectCommand(stringBuilder, "Maven", "mvn --version", "MAVEN_HOME");
			DetectCommand(stringBuilder, "Gradle", "gradle --version", "GRADLE_HOME");
			DetectCommand(stringBuilder, "CMake", "cmake --version", null);
			DetectCommand(stringBuilder, "yarn", "yarn --version", null);
			DetectCommand(stringBuilder, "pip", "pip --version", null);
			stringBuilder.AppendLine();
		}
		string text2 = stringBuilder.ToString();
		_cache = (DateTime.UtcNow, text2);
		return Task.FromResult(ToolResult.Ok(text2));
	}

	private static void DetectIde(StringBuilder sb, string name, Func<string?> detector)
	{
		string text = detector();
		sb.AppendLine((text != null) ? ("  ✅ " + name + ": " + text) : ("  ❌ " + name + ": 미설치"));
	}

	private static void DetectCommand(StringBuilder sb, string name, string versionCmd, string? envVar)
	{
		string text = null;
		if (envVar != null)
		{
			text = Environment.GetEnvironmentVariable(envVar);
		}
		string text2 = RunQuick("where.exe", name);
		string value = "";
		if (text2 != null)
		{
			string[] array = versionCmd.Split(' ', 2);
			string text3 = RunQuick(array[0], (array.Length > 1) ? array[1] : "");
			if (text3 != null)
			{
				value = text3.Split('\n')[0].Trim();
			}
		}
		if (text2 != null)
		{
			StringBuilder stringBuilder = sb;
			StringBuilder stringBuilder2 = stringBuilder;
			StringBuilder.AppendInterpolatedStringHandler handler = new StringBuilder.AppendInterpolatedStringHandler(9, 3, stringBuilder);
			handler.AppendLiteral("  ✅ ");
			handler.AppendFormatted(name);
			handler.AppendLiteral(": ");
			handler.AppendFormatted(value);
			handler.AppendLiteral(" (");
			handler.AppendFormatted(text2.Split('\n')[0].Trim());
			handler.AppendLiteral(")");
			stringBuilder2.AppendLine(ref handler);
		}
		else if (text != null)
		{
			StringBuilder stringBuilder = sb;
			StringBuilder stringBuilder3 = stringBuilder;
			StringBuilder.AppendInterpolatedStringHandler handler = new StringBuilder.AppendInterpolatedStringHandler(15, 3, stringBuilder);
			handler.AppendLiteral("  ⚠ ");
			handler.AppendFormatted(name);
			handler.AppendLiteral(": 환경변수만 (");
			handler.AppendFormatted(envVar);
			handler.AppendLiteral("=");
			handler.AppendFormatted(text);
			handler.AppendLiteral(")");
			stringBuilder3.AppendLine(ref handler);
		}
		else
		{
			StringBuilder stringBuilder = sb;
			StringBuilder stringBuilder4 = stringBuilder;
			StringBuilder.AppendInterpolatedStringHandler handler = new StringBuilder.AppendInterpolatedStringHandler(9, 1, stringBuilder);
			handler.AppendLiteral("  ❌ ");
			handler.AppendFormatted(name);
			handler.AppendLiteral(": 미설치");
			stringBuilder4.AppendLine(ref handler);
		}
	}

	private static string? RunQuick(string exe, string args)
	{
		try
		{
			ProcessStartInfo startInfo = new ProcessStartInfo(exe, args)
			{
				RedirectStandardOutput = true,
				RedirectStandardError = true,
				UseShellExecute = false,
				CreateNoWindow = true
			};
			using Process process = Process.Start(startInfo);
			if (process == null)
			{
				return null;
			}
			string text = process.StandardOutput.ReadToEnd();
			string text2 = process.StandardError.ReadToEnd();
			process.WaitForExit(5000);
			string text3 = (string.IsNullOrWhiteSpace(text) ? text2 : text);
			return string.IsNullOrWhiteSpace(text3) ? null : text3.Trim();
		}
		catch
		{
			return null;
		}
	}

	private static string? DetectVsCode()
	{
		string text = RunQuick("where.exe", "code");
		if (text != null)
		{
			return text.Split('\n')[0].Trim();
		}
		string folderPath = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
		string text2 = Path.Combine(folderPath, "Programs", "Microsoft VS Code", "Code.exe");
		return File.Exists(text2) ? text2 : null;
	}

	private static string? DetectVisualStudio()
	{
		try
		{
			using RegistryKey registryKey = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\VisualStudio\\SxS\\VS7");
			if (registryKey != null)
			{
				foreach (string item in from n in registryKey.GetValueNames()
					orderby n descending
					select n)
				{
					string text = registryKey.GetValue(item)?.ToString();
					if (!string.IsNullOrEmpty(text) && Directory.Exists(text))
					{
						return $"Visual Studio {item} ({text})";
					}
				}
			}
			using RegistryKey registryKey2 = Registry.LocalMachine.OpenSubKey("SOFTWARE\\WOW6432Node\\Microsoft\\VisualStudio\\SxS\\VS7");
			if (registryKey2 != null)
			{
				foreach (string item2 in from n in registryKey2.GetValueNames()
					orderby n descending
					select n)
				{
					string text2 = registryKey2.GetValue(item2)?.ToString();
					if (!string.IsNullOrEmpty(text2) && Directory.Exists(text2))
					{
						return $"Visual Studio {item2} ({text2})";
					}
				}
			}
		}
		catch
		{
		}
		string text3 = RunQuick("where.exe", "devenv");
		return (text3 != null) ? text3.Split('\n')[0].Trim() : null;
	}

	private static string? DetectJetBrains(string product)
	{
		try
		{
			using RegistryKey registryKey = Registry.LocalMachine.OpenSubKey("SOFTWARE\\JetBrains\\" + product);
			if (registryKey != null)
			{
				string[] array = (from n in registryKey.GetSubKeyNames()
					orderby n descending
					select n).ToArray();
				if (array.Length != 0)
				{
					using RegistryKey registryKey2 = registryKey.OpenSubKey(array[0]);
					string value = registryKey2?.GetValue("InstallDir")?.ToString() ?? registryKey2?.GetValue("")?.ToString();
					if (!string.IsNullOrEmpty(value))
					{
						return $"{product} {array[0]} ({value})";
					}
				}
			}
		}
		catch
		{
		}
		return null;
	}
}