using System.Data;
using Validation.Core;

namespace Validation.Rule.Common
{
    /// <summary>
    /// 非空校验规则
    /// </summary>
    public class NotNullValidationRule : IValidationRule
    {
        public string RuleName => "NotNull";
        public string Description => "检查数据是否包含空值";

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

            foreach (DataRow row in dataTable.Rows)
            {
                foreach (DataColumn col in dataTable.Columns)
                {
                    if (row.IsNull(col))
                    {
                        int rowIndex = dataTable.Rows.IndexOf(row);
                        result.AddError(rowIndex, $"第{rowIndex + 1}行，列'{col.ColumnName}'不能为空");
                    }
                }
            }

            return result;
        }

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

            for (int i = 0; i < headers.Length && i < values.Length; i++)
            {
                if (values[i] == null || values[i] == DBNull.Value)
                {
                    result.AddError(rowIndex, $"第{rowIndex + 1}行，列'{headers[i]}'不能为空");
                }
            }

            return result;
        }
    }
}