using MediatR;
using Microsoft.Extensions.Logging;
using X1.Domain.Events;
using X1.Domain.Entities.TestCase;
using X1.Application.Features.TaskExecution.Events.NodeExecutionEvents;

namespace X1.Application.Features.TaskExecution.Events.Interfaces;

/// <summary>
/// 节点执行处理器基础抽象类
/// 提供通用的处理逻辑和模板方法
/// </summary>
/// <typeparam name="T">事件类型</typeparam>
public abstract class INodeExecutionHandlerBase<T> : INodeExecutionHandler<T>
    where T : INodeExecutionEvent
{
    protected readonly IMediator _mediator;
    protected readonly ILogger _logger;

    /// <summary>
    /// 初始化处理器
    /// </summary>
    /// <param name="mediator">MediatR 中介者</param>
    /// <param name="logger">日志记录器</param>
    protected INodeExecutionHandlerBase(IMediator mediator, ILogger logger)
    {
        _mediator = mediator;
        _logger = logger;
    }

    /// <summary>
    /// MediatR 事件处理方法
    /// </summary>
    /// <param name="notification">事件通知</param>
    /// <param name="cancellationToken">取消令牌</param>
    /// <returns>处理任务</returns>
    public async Task Handle(T notification, CancellationToken cancellationToken)
    {
        try
        {
            _logger.LogInformation("开始处理节点执行事件，任务执行ID: {TaskExecutionId}, 节点ID: {NodeId}, 步骤映射: {StepMapping}",
                notification.TaskExecutionId, notification.NodeId, notification.StepMapping);

            // 检查是否支持处理此事件
            if (!CanHandle(notification.StepMapping))
            {
                _logger.LogWarning("处理器不支持此步骤映射类型: {StepMapping}", notification.StepMapping);
                return;
            }

            // 调用具体的处理逻辑
            await HandleAsync(notification, cancellationToken);

            _logger.LogInformation("节点执行事件处理完成，任务执行ID: {TaskExecutionId}, 节点ID: {NodeId}",
                notification.TaskExecutionId, notification.NodeId);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "处理节点执行事件时发生错误，任务执行ID: {TaskExecutionId}, 节点ID: {NodeId}, 步骤映射: {StepMapping}",
                notification.TaskExecutionId, notification.NodeId, notification.StepMapping);

            // 发布失败事件
            await _mediator.Publish(new NodeExecutionFailedEvent
            {
                TaskExecutionId = notification.TaskExecutionId,
                NodeId = notification.NodeId,
                StepMapping = notification.StepMapping,
                ExecutorId = notification.ExecutorId,
                RuntimeCode = notification.RuntimeCode,
                ScenarioCode = notification.ScenarioCode,
                ScenarioId = notification.ScenarioId,
                FlowName = notification.FlowName,
                FlowId = notification.FlowId,
                ErrorMessage = ex.Message,
                Timestamp = DateTime.UtcNow
            }, cancellationToken);
        }
    }

    /// <summary>
    /// 抽象方法：具体的处理逻辑
    /// </summary>
    /// <param name="notification">事件通知</param>
    /// <param name="cancellationToken">取消令牌</param>
    /// <returns>处理任务</returns>
    public abstract Task HandleAsync(T notification, CancellationToken cancellationToken);

    /// <summary>
    /// 抽象方法：检查是否支持处理指定的事件类型
    /// </summary>
    /// <param name="stepMapping">步骤映射类型</param>
    /// <returns>是否支持</returns>
    public abstract bool CanHandle(StepMapping stepMapping);

    /// <summary>
    /// 抽象方法：获取处理器支持的步骤映射类型
    /// </summary>
    /// <returns>支持的步骤映射类型</returns>
    public abstract StepMapping GetSupportedStepMapping();

    /// <summary>
    /// 发布完成事件
    /// </summary>
    /// <param name="notification">原始事件</param>
    /// <param name="result">执行结果</param>
    /// <param name="cancellationToken">取消令牌</param>
    /// <returns>发布任务</returns>
    protected async Task PublishCompletedEventAsync(T notification, NodeExecutionResult result, CancellationToken cancellationToken)
    {
        var completedEvent = new NodeExecutionCompletedEvent
        {
            TaskExecutionId = notification.TaskExecutionId,
            NodeId = notification.NodeId,
            StepMapping = notification.StepMapping,
            ExecutorId = notification.ExecutorId,
            RuntimeCode = notification.RuntimeCode,
            ScenarioCode = notification.ScenarioCode,
            ScenarioId = notification.ScenarioId,
            FlowName = notification.FlowName,
            FlowId = notification.FlowId,
            Result = result,
            Timestamp = DateTime.UtcNow
        };

        await _mediator.Publish(completedEvent, cancellationToken);
    }

    /// <summary>
    /// 发布失败事件
    /// </summary>
    /// <param name="notification">原始事件</param>
    /// <param name="errorMessage">错误消息</param>
    /// <param name="cancellationToken">取消令牌</param>
    /// <returns>发布任务</returns>
    protected async Task PublishFailedEventAsync(T notification, string errorMessage, CancellationToken cancellationToken)
    {
        var failedEvent = new NodeExecutionFailedEvent
        {
            TaskExecutionId = notification.TaskExecutionId,
            NodeId = notification.NodeId,
            StepMapping = notification.StepMapping,
            ExecutorId = notification.ExecutorId,
            RuntimeCode = notification.RuntimeCode,
            ScenarioCode = notification.ScenarioCode,
            ScenarioId = notification.ScenarioId,
            FlowName = notification.FlowName,
            FlowId = notification.FlowId,
            ErrorMessage = errorMessage,
            Timestamp = DateTime.UtcNow
        };

        await _mediator.Publish(failedEvent, cancellationToken);
    }
}