using System.Data;
using Validation.Core;

namespace Validation.Validator
{
    /// <summary>
    /// 简单校验类
    /// </summary>
    public class SimpleDataValidator : IDataValidator
    {
        private const int MaxValidationErrors = 100;
        private readonly List<IValidationRule> rules = new List<IValidationRule>();


        public void AddRule(IValidationRule rule)
        {
            rules.Add(rule ?? throw new ArgumentNullException(nameof(rule)));
        }

        /// <inheritdoc />
        public void RemoveRule(string ruleName)
        {
            rules.RemoveAll(r => r.RuleName == ruleName);
        }

        /// <inheritdoc />
        public IEnumerable<IValidationRule> GetRules() => rules.AsReadOnly();

        /// <inheritdoc />
        public ValidationResult Validate(DataTable dataTable)
        {
            return Validate(dataTable, rules);
        }

        /// <inheritdoc />
        public ValidationResult Validate(DataTable dataTable, IEnumerable<IValidationRule> customRules)
        {
            var result = new ValidationResult { IsValid = true };

            if (dataTable == null)
            {
                result.AddError(-1, "数据表不能为空");
                return result;
            }

            foreach (var rule in customRules)
            {
                try
                {
                    var ruleResult = rule.Validate(dataTable);
                    if (!ruleResult.IsValid)
                    {
                        result.IsValid = false;
                        result.Errors.AddRange(ruleResult.Errors);
                    }
                    result.Warnings.AddRange(ruleResult.Warnings);
                }
                catch (Exception ex)
                {
                    result.AddError(-1, $"规则 '{rule.RuleName}' 执行异常: {ex.Message}");
                }
            }

            return result;
        }

        public ValidationResult Validate(string[] headers, int rowIndex, object[] values, IEnumerable<IValidationRule> customRules)
        {
            var result = new ValidationResult { IsValid = true };

            foreach (var rule in customRules)
            {
                try
                {
                    var ruleResult = rule.Validate(headers, rowIndex, values);
                    if (!ruleResult.IsValid)
                    {
                        result.IsValid = false;
                        result.Errors.AddRange(ruleResult.Errors);
                    }
                    result.Warnings.AddRange(ruleResult.Warnings);

                    if (result.Errors.Count > MaxValidationErrors)
                    {
                        return result;
                    }
                }
                catch (Exception ex)
                {
                    result.AddError(-1, $"规则 '{rule.RuleName}' 执行异常: {ex.Message}");
                }
            }

            return result;
        }

        public ValidationResult Validate(string[] headers, int rowIndex, object[] values)
        {
            return Validate(headers, rowIndex, values, rules);
        }
    }
}