using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;
using System.Text.Json;
using System.Threading;
using System.Threading.Tasks;

namespace AxCopilot.Services.Agent;

public class FileReadTool : IAgentTool
{
	public string Name => "file_read";

	public string Description => "Read the contents of a file. Returns the text content with line numbers.";

	public ToolParameterSchema Parameters
	{
		get
		{
			ToolParameterSchema obj = new ToolParameterSchema
			{
				Properties = new Dictionary<string, ToolProperty>
				{
					["path"] = new ToolProperty
					{
						Type = "string",
						Description = "File path to read (absolute or relative to work folder)"
					},
					["offset"] = new ToolProperty
					{
						Type = "integer",
						Description = "Starting line number (1-based). Optional, default 1."
					},
					["limit"] = new ToolProperty
					{
						Type = "integer",
						Description = "Maximum number of lines to read. Optional, default 500."
					}
				}
			};
			int num = 1;
			List<string> list = new List<string>(num);
			CollectionsMarshal.SetCount(list, num);
			CollectionsMarshal.AsSpan(list)[0] = "path";
			obj.Required = list;
			return obj;
		}
	}

	public Task<ToolResult> ExecuteAsync(JsonElement args, AgentContext context, CancellationToken ct)
	{
		if (!args.TryGetProperty("path", out var value))
		{
			return Task.FromResult(ToolResult.Fail("path가 필요합니다."));
		}
		string path = value.GetString() ?? "";
		JsonElement value2;
		int num = ((!args.TryGetProperty("offset", out value2)) ? 1 : value2.GetInt32());
		JsonElement value3;
		int num2 = (args.TryGetProperty("limit", out value3) ? value3.GetInt32() : 500);
		string text = ResolvePath(path, context.WorkFolder);
		if (!context.IsPathAllowed(text))
		{
			return Task.FromResult(ToolResult.Fail("경로 접근 차단: " + text));
		}
		if (!File.Exists(text))
		{
			return Task.FromResult(ToolResult.Fail("파일이 존재하지 않습니다: " + text));
		}
		try
		{
			string[] array = File.ReadAllLines(text, Encoding.UTF8);
			int num3 = array.Length;
			int num4 = Math.Max(0, num - 1);
			int num5 = Math.Min(num3, num4 + num2);
			StringBuilder stringBuilder = new StringBuilder();
			StringBuilder stringBuilder2 = stringBuilder;
			StringBuilder stringBuilder3 = stringBuilder2;
			StringBuilder.AppendInterpolatedStringHandler handler = new StringBuilder.AppendInterpolatedStringHandler(22, 4, stringBuilder2);
			handler.AppendLiteral("[");
			handler.AppendFormatted(text);
			handler.AppendLiteral("] (");
			handler.AppendFormatted(num3);
			handler.AppendLiteral(" lines, showing ");
			handler.AppendFormatted(num4 + 1);
			handler.AppendLiteral("-");
			handler.AppendFormatted(num5);
			handler.AppendLiteral(")");
			stringBuilder3.AppendLine(ref handler);
			for (int i = num4; i < num5; i++)
			{
				stringBuilder2 = stringBuilder;
				StringBuilder stringBuilder4 = stringBuilder2;
				handler = new StringBuilder.AppendInterpolatedStringHandler(1, 2, stringBuilder2);
				handler.AppendFormatted(i + 1, 5);
				handler.AppendLiteral("\t");
				handler.AppendFormatted(array[i]);
				stringBuilder4.AppendLine(ref handler);
			}
			return Task.FromResult(ToolResult.Ok(stringBuilder.ToString(), text));
		}
		catch (Exception ex)
		{
			return Task.FromResult(ToolResult.Fail("파일 읽기 실패: " + ex.Message));
		}
	}

	internal static string ResolvePath(string path, string workFolder)
	{
		if (Path.IsPathRooted(path))
		{
			return Path.GetFullPath(path);
		}
		if (!string.IsNullOrEmpty(workFolder))
		{
			return Path.GetFullPath(Path.Combine(workFolder, path));
		}
		return Path.GetFullPath(path);
	}
}