using Microsoft.SqlServer.TransactSql.ScriptDom;
using SQLLinter.Common;
using SQLLinter.Common.Helpers;
using System.Text.RegularExpressions;

namespace SQLLinter.Infrastructure.Rules;

public class DuplicateEmptyLineRule : BaseRuleVisitor, IRule
{
    private static readonly Regex EmptyLineRegex = new(@"^\s*$", RegexOptions.Compiled);


    public override string Text => "Обнаружен дубликат новой строки";

    public override void Visit(TSqlScript node)
    {
        var isEmptyLine = false;
        var fileLines = FixHelpers.GetString(node)
            .Split('\n')
            .ToList();

        for (var i = 0; i < fileLines.Count; i++)
        {
            if (EmptyLineRegex.IsMatch(fileLines[i]))
            {
                if (isEmptyLine)
                {
                    AddViolation(Name, Text, i + 1, 1);
                }

                isEmptyLine = true;
            }
            else
            {
                isEmptyLine = false;
            }
        }
    }

    public override void FixViolation(List<string> fileLines, IRuleViolation ruleViolation, FileLineActions actions)
    {
        if (ruleViolation.Line - 1 == fileLines.Count)
        {
            actions.RemoveAt(ruleViolation.Line - 2);
        }
        else
        {
            actions.RemoveAt(ruleViolation.Line - 1);
        }
    }
}