using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;

namespace YunDa.SOMS.Application.DataMonitoring.SecondaryCircuitInspection.Services
{
    /// <summary>
    /// 表达式计算服务接口
    /// </summary>
    public interface IExpressionEvaluationService
    {
        /// <summary>
        /// 计算表达式结果
        /// </summary>
        /// <param name="expression">表达式字符串，格式如: {16385_0}==1&&{752}>1000</param>
        /// <param name="timeWindowSeconds">时间窗口（秒）</param>
        /// <param name="cancellationToken">取消令牌</param>
        /// <returns>表达式计算结果</returns>
        Task<ExpressionEvaluationResult> EvaluateExpressionAsync(
            string expression, 
            int timeWindowSeconds = 60,
            CancellationToken cancellationToken = default);

        /// <summary>
        /// 验证表达式语法
        /// </summary>
        /// <param name="expression">表达式字符串</param>
        /// <returns>验证结果</returns>
        ExpressionValidationResult ValidateExpression(string expression);

        /// <summary>
        /// 提取表达式中的变量代码
        /// </summary>
        /// <param name="expression">表达式字符串</param>
        /// <returns>变量代码列表</returns>
        List<string> ExtractVariableCodes(string expression);
    }

    /// <summary>
    /// 表达式计算结果
    /// </summary>
    public class ExpressionEvaluationResult
    {
        /// <summary>
        /// 计算是否成功
        /// </summary>
        public bool IsSuccess { get; set; }

        /// <summary>
        /// 表达式结果
        /// </summary>
        public bool Result { get; set; }

        /// <summary>
        /// 错误信息
        /// </summary>
        public string ErrorMessage { get; set; }

        /// <summary>
        /// 计算耗时（毫秒）
        /// </summary>
        public long ExecutionTimeMs { get; set; }

        /// <summary>
        /// 变量值快照
        /// </summary>
        public Dictionary<string, object> VariableValues { get; set; }

        /// <summary>
        /// 详细计算过程
        /// </summary>
        public List<string> EvaluationDetails { get; set; }

        /// <summary>
        /// 计算时间
        /// </summary>
        public DateTime EvaluationTime { get; set; }

        public ExpressionEvaluationResult()
        {
            VariableValues = new Dictionary<string, object>();
            EvaluationDetails = new List<string>();
            EvaluationTime = DateTime.Now;
        }
    }

    /// <summary>
    /// 表达式验证结果
    /// </summary>
    public class ExpressionValidationResult
    {
        /// <summary>
        /// 验证是否通过
        /// </summary>
        public bool IsValid { get; set; }

        /// <summary>
        /// 错误信息列表
        /// </summary>
        public List<string> Errors { get; set; }

        /// <summary>
        /// 警告信息列表
        /// </summary>
        public List<string> Warnings { get; set; }

        /// <summary>
        /// 提取的变量代码
        /// </summary>
        public List<string> VariableCodes { get; set; }

        public ExpressionValidationResult()
        {
            Errors = new List<string>();
            Warnings = new List<string>();
            VariableCodes = new List<string>();
        }
    }
}