using DS.Module.Core.Data;

namespace DS.Module.Core.Condition
{
    public class ConditionHelper
    {
        /// <summary>
        /// 根据ContitionContent条件，从数据上下文TaskFlowDataContext中取出指定数据，然后判断条件是否符合
        /// </summary>
        public static bool IsPass(ConditionContent conditionContent, TaskFlowDataContext dataContext)
        {
            bool? thisScopeResult = null;

            if (conditionContent == null || conditionContent.Conditions == null || conditionContent.Conditions.Count == 0)
            {
                return true;
            }

            IDictionary<string, object>? dataDic = null;
            if (!string.IsNullOrEmpty(conditionContent.SourceName) && dataContext.ContainsKey(conditionContent.SourceName))
            {
                dataDic = dataContext[conditionContent.SourceName] as IDictionary<string, object>;
            }

            foreach (var item in conditionContent.Conditions)
            {
                var itemResult = false;
                string? valStr = null;

                if (dataDic != null && dataDic.TryGetValue(item.Field, out object? objVal))
                {
                    valStr = objVal?.ToString();
                }
                else if (dataContext.ContainsKey(item.Field))
                {
                    var obj = dataContext.Get<object>(item.Field)!;
                    if (obj != null)
                    {
                        valStr = obj.ToString();
                    }
                }
                else if (item.Field!.Contains('.'))
                {
                    var firstKey = item.Field.Split('.').First();

                    if (dataContext.ContainsKey(firstKey))
                    {
                        var obj = dataContext.Get<object>(firstKey)!;

                        if (obj == null)
                        {
                            valStr = null;
                        }
                        else
                        {
                            var propertyPath = item.Field.Substring(item.Field.IndexOf('.') + 1);
                            var (_, val, _) = GetPropertyValue(obj, propertyPath);

                            if (val != null)
                                valStr = val.ToString();
                        }
                    }
                }


                switch (item.Operator)
                {
                    case "equal":
                        itemResult = (valStr == null && item.Value == null) || valStr?.Equals(item.Value, StringComparison.OrdinalIgnoreCase) == true; break;
                    case "not_equal":
                        itemResult = (valStr != null || item.Value != null) && valStr?.Equals(item.Value, StringComparison.OrdinalIgnoreCase) != true; break;
                    case "contains":
                        itemResult = valStr?.Contains(item.Value, StringComparison.OrdinalIgnoreCase) == true; break;
                    case "not_contain":
                        itemResult = valStr?.Contains(item.Value, StringComparison.OrdinalIgnoreCase) != true; break;
                    case "empty":
                        itemResult = string.IsNullOrWhiteSpace(valStr) == true; break;
                    case "not_empty":
                        itemResult = string.IsNullOrWhiteSpace(valStr) != true; break;
                    case "start_with":
                        itemResult = valStr?.StartsWith(item.Value, StringComparison.OrdinalIgnoreCase) == true; break;
                    case "end_with":
                        itemResult = valStr?.EndsWith(item.Value, StringComparison.OrdinalIgnoreCase) == true; break;
                    case "greater_than":
                        {
                            itemResult = double.TryParse(valStr, out double temp1) && double.TryParse(item.Value, out double temp2) && temp1 > temp2; break;
                        }
                    case "greater_than_or_equal":
                        {
                            itemResult = double.TryParse(valStr, out double temp1) && double.TryParse(item.Value, out double temp2) && temp1 >= temp2; break;
                        }
                    case "less_than":
                        {
                            itemResult = double.TryParse(valStr, out double temp1) && double.TryParse(item.Value, out double temp2) && temp1 < temp2; break;
                        }
                    case "less_than_or_equal":
                        {
                            itemResult = double.TryParse(valStr, out double temp1) && double.TryParse(item.Value, out double temp2) && temp1 <= temp2; break;
                        }
                }

                if (thisScopeResult == null)
                {
                    thisScopeResult = itemResult;
                }
                else
                {
                    if (conditionContent.LogicalOperator == "and")
                    {
                        thisScopeResult = thisScopeResult.Value && itemResult;
                    }
                    else if (conditionContent.LogicalOperator == "or")
                    {
                        thisScopeResult = thisScopeResult.Value || itemResult;
                    }
                }
            }

            //thisScopeResult ??= true;   // 实际这里的thisScopeResult的值啃腚不为null

            if (conditionContent.Groups != null && conditionContent.Groups.Count > 0)
            {
                // 组的结果
                var groupResult = new List<bool>();
                foreach (var item in conditionContent.Groups)
                {
                    // 递归调用，向组里添加结果
                    groupResult.Add(IsPass(item, dataContext));
                }

                if (conditionContent.LogicalOperator == "and")
                {
                    return thisScopeResult == true && groupResult.All(a => a);
                }
                else if (conditionContent.LogicalOperator == "or")
                {
                    return thisScopeResult == true || groupResult.Any(a => a);
                }
            }
            return thisScopeResult == true;
        }

        /// <summary>
        /// 获取指定条件的条件数量
        /// </summary>
        /// <param name="condition"></param>
        /// <returns></returns>
        public static int GetConditionCount(ConditionContent condition)
        {
            int n = condition.Conditions?.Count ?? 0;
            if (condition.Groups != null && condition.Groups.Count > 0)
            {
                n += condition.Groups.Sum(x => GetConditionCount(x));
            }
            return n;
        }

        /// <summary>
        /// 深度获取对象属性值
        /// </summary>
        /// <param name="obj">对象</param>
        /// <param name="propertyPath">属性路径</param>
        static (bool isOk, object? val, string? otherPropertyPath) GetPropertyValue(object obj, string propertyPath)
        {
            var propertyName = propertyPath.Split('.').FirstOrDefault();
            var type = obj.GetType();

            var property = type.GetProperty(propertyName);
            if (property == null)
            {
                return (true, null, null);
            }

            if (property.PropertyType.IsClass && property.PropertyType != typeof(string))
            {
                var val = property.GetValue(obj);
                if (val == null)
                {
                    return (true, null, null);
                }
                var otherPropertyPath = propertyPath.Substring(propertyPath.IndexOf('.') + 1);
                return GetPropertyValue(val, otherPropertyPath);
            }
            else
            {
                var val = property.GetValue(obj);
                return (true, val, null);
            }
        }
    }
}