using SQLLinter.Core;
using SQLLinter.Core.Interfaces;
using System.Text.RegularExpressions;

namespace SQLLinter.Infrastructure.Configuration.Overrides;

public class OverrideFinder
{
    private static Regex _OverrideRegex = new Regex(@".*?sqllinter-override ?(.* += +.*)+.*", RegexOptions.Compiled | RegexOptions.IgnoreCase);

    public IEnumerable<IOverride> GetOverrideList(Stream fileStream)
    {
        var overrideList = new List<IOverride>();
        TextReader reader = new StreamReader(fileStream);

        string line;
        while ((line = reader.ReadLine()) != null)
        {
            if (line.Length > Constants.MaxLineWidthForRegexEval || !line.Contains("sqllinter-override"))
            {
                continue;
            }

            var match = _OverrideRegex.Match(line);
            if (!match.Success)
            {
                continue;
            }

            var overrideDetails = match.Groups[1].Value.Split(',').Select(p => p.Trim()).ToList();
            foreach (var overrideDetail in overrideDetails)
            {
                var details = overrideDetail.Split(' ').Select(p => p.Trim()).ToList();
                if (OverrideTypeMap.List.ContainsKey(details[0]))
                {
                    var overrideType = OverrideTypeMap.List.GetValueOrDefault(details[0]);
                    overrideList.Add((IOverride)Activator.CreateInstance(overrideType, details[2]));
                }
            }
        }

        fileStream.Seek(0, SeekOrigin.Begin);

        return overrideList;
    }
}