using CliWrap;
using CliWrap.Buffered;
using CoreAgent.Domain.Interfaces.System.Command;
using CoreAgent.Domain.Models;
using CoreAgent.Domain.Models.System;
using Microsoft.Extensions.Logging;

namespace CoreAgent.Infrastructure.Command.Base;

/// <summary>
/// 命令执行器基类
/// </summary>
public abstract class BaseCommandExecutor : ISystemCommandExecutor
{
    protected readonly ILogger _logger;
    protected abstract string DefaultShell { get; }

    protected BaseCommandExecutor(ILogger logger)
    {
        _logger = logger ?? throw new ArgumentNullException(nameof(logger));
    }

    /// <summary>
    /// 执行命令并实时输出结果
    /// </summary>
    public abstract Task ExecuteCommandWithOutputAsync(string command, Action<string> outputHandler, Action<string> errorHandler, CancellationTokenSource cancellationTokenSource, int timeout = -1);

    /// <summary>
    /// 执行命令并返回结果
    /// </summary>
    public abstract Task<CommandExecutionResult> ExecuteCommandAsync(string command, CancellationTokenSource cancellationTokenSource, int timeout = -1);

    /// <summary>
    /// 获取命令参数，由子类实现具体的命令参数格式化逻辑
    /// </summary>
    protected abstract string GetCommandArguments(string command);

    /// <summary>
    /// 执行命令的通用逻辑
    /// </summary>
    protected virtual async Task<CommandExecutionResult> ExecuteCommandInternalAsync(string command, string arguments, CancellationTokenSource cancellationTokenSource, int timeout = -1)
    {
        if (string.IsNullOrWhiteSpace(command))
        {
            throw new ArgumentException("命令不能为空", nameof(command));
        }

        if (cancellationTokenSource == null)
        {
            throw new ArgumentNullException(nameof(cancellationTokenSource));
        }

        var startTime = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds();
        try
        {
            _logger.LogDebug("开始执行命令: {Command}", command);
            
            var cmd = Cli.Wrap(DefaultShell)
                .WithArguments(arguments)
                .WithValidation(CommandResultValidation.None);

            // 如果设置了超时，创建一个新的 CancellationTokenSource
            using var timeoutCts = timeout > 0 ? new CancellationTokenSource(timeout) : null;
            using var linkedCts = timeout > 0 
                ? CancellationTokenSource.CreateLinkedTokenSource(cancellationTokenSource.Token, timeoutCts!.Token)
                : cancellationTokenSource;

            var result = await cmd.ExecuteBufferedAsync(linkedCts.Token);
            var executionTime = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds() - startTime;

            if (result.IsSuccess)
            {
                _logger.LogDebug("命令执行成功 - 输出: {Output}", result.StandardOutput);
                return CommandExecutionResult.Success(result.StandardOutput, executionTime);
            }
            else
            {
                _logger.LogDebug("命令执行失败 - 错误: {Error}", result.StandardError);
                return CommandExecutionResult.Failure(result.StandardError, executionTime);
            }
        }
        catch (OperationCanceledException ex)
        {
            var executionTime = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds() - startTime;
            _logger.LogError(ex, "命令执行超时: {Command}", command);
            return CommandExecutionResult.Failure("命令执行超时", executionTime);
        }
        catch (Exception ex)
        {
            var executionTime = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds() - startTime;
            _logger.LogError(ex, "命令执行失败: {Command}, 错误: {ErrorMessage}", command, ex.Message);
            return CommandExecutionResult.Failure(ex.Message, executionTime);
        }
    }
}