using System.Text.RegularExpressions;

namespace Textile.States
{
    [FormatterState(@"^\s*<code" + Globals.HtmlAttributesPattern + ">")]
    public class CodeFormatterState : FormatterState
    {
        bool m_shouldExitNextTime = false;
        bool m_shouldFixHtmlEntities = false;

        public CodeFormatterState(TextileFormatter f)
            : base(f)
        {
        }

        public override string Consume(string input, Match m)
        {
            if (!Regex.IsMatch(input, "</code>"))
            {
                this.Formatter.ChangeState(this);
            }
            else
            {
                this.Formatter.ChangeState(new PassthroughFormatterState(this.Formatter));
            }
            return input;
        }

        public override bool ShouldNestState(FormatterState other)
        {
            return true;
        }

        public override void Enter()
        {
            m_shouldFixHtmlEntities = false;
        }

        public override void Exit()
        {
        }

        public override void FormatLine(string input)
        {
            if (m_shouldFixHtmlEntities)
                input = FixEntities(input);
            Formatter.Output.WriteLine(input);
            m_shouldFixHtmlEntities = true;
        }

        public override bool ShouldExit(string input)
        {
            if (m_shouldExitNextTime)
                return true;
            m_shouldExitNextTime = Regex.IsMatch(input, @"</code>");
            m_shouldFixHtmlEntities = !m_shouldExitNextTime;
            return false;
        }

        public override bool ShouldFormatBlocks(string input)
        {
            return false;
        }

        public override bool ShouldParseForNewFormatterState(string input)
        {
            return false;
        }

        private string FixEntities(string text)
        {
            // de-entify any remaining angle brackets or ampersands
            text = text.Replace("&", "&amp;");
            text = text.Replace(">", "&gt;");
            text = text.Replace("<", "&lt;");
            //Regex.Replace(text, @"\b&([#a-z0-9]+;)", "x%x%");
            return text;
        }
    }
}