using System.Text.RegularExpressions;

namespace Textile.States
{
    public abstract class SimpleBlockFormatterState : FormatterState
    {
        internal const string PatternBegin = @"^\s*(?<tag>";
        internal const string PatternEnd = @")" + Globals.AlignPattern + Globals.BlockModifiersPattern + @"\.(?:\s+)?(?<content>.*)$";

        public string Tag { get; private set; } = null;

        public string AlignInfo { get; private set; } = null;

        public string AttInfo { get; private set; } = null;

        protected SimpleBlockFormatterState(TextileFormatter formatter)
            : base(formatter)
        {
        }

        public override string Consume(string input, Match m)
        {
            Tag = m.Groups["tag"].Value;
            AlignInfo = m.Groups["align"].Value;
            AttInfo = m.Groups["atts"].Value;
            input = m.Groups["content"].Value;

            OnContextAcquired();

            this.Formatter.ChangeState(this);

            return input;
        }

        public override bool ShouldNestState(FormatterState other)
        {
            var blockFormatterState = (SimpleBlockFormatterState)other;
            return blockFormatterState.Tag != Tag ||
                    blockFormatterState.AlignInfo != AlignInfo ||
                    blockFormatterState.AttInfo != AttInfo;
        }

        protected virtual void OnContextAcquired()
        {
        }

        /// <summary>
        /// 
        /// </summary>
        /// <returns></returns>
        protected string FormattedAlignment()
        {
            return Blocks.BlockAttributesParser.ParseBlockAttributes(AlignInfo);
        }

        protected string FormattedStyles(string element)
        {
            return Blocks.BlockAttributesParser.ParseBlockAttributes(AttInfo, element);
        }

        protected string FormattedStylesAndAlignment(string element)
        {
            return Blocks.BlockAttributesParser.ParseBlockAttributes(AlignInfo + AttInfo, element);
        }
    }
}