using System;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
using System.Text.RegularExpressions;

namespace Nikse.SubtitleEdit.Core.SubtitleFormats
{
    /// <summary>
    ///4.01     5.12
    ///Dit is de dag.
    /// </summary>
    public class UnknownSubtitle12 : SubtitleFormat
    {
        private static readonly Regex RegexTimeCode = new Regex(@"^\d+\.\d\d\t\t\d+\.\d\d\t*$", RegexOptions.Compiled);

        public override string Extension => ".txt";

        public override string Name => "Unknown 12";

        private static string MakeTimeCode(TimeCode tc)
        {
            return string.Format(CultureInfo.InvariantCulture, "{0:0.00}", tc.TotalSeconds);
        }

        public override string ToText(Subtitle subtitle, string title)
        {
            var sb = new StringBuilder();
            foreach (Paragraph p in subtitle.Paragraphs)
            {
                sb.Append(MakeTimeCode(p.StartTime));
                sb.Append("\t\t");
                sb.Append(MakeTimeCode(p.EndTime));
                sb.Append("\t\t\n");
                sb.Append(p.Text.Replace(Environment.NewLine, "\n") + "\n\n");
            }
            return sb.ToString().Trim();
        }

        private static TimeCode DecodeTimeCode(string timeCode)
        {
            return TimeCode.FromSeconds(double.Parse(timeCode.Trim()));
        }

        public override void LoadSubtitle(Subtitle subtitle, List<string> lines, string fileName)
        {
            _errorCount = 0;
            Paragraph p = null;
            var text = new StringBuilder();
            foreach (string line in lines)
            {
                string s = line.Trim();
                if (RegexTimeCode.IsMatch(s))
                {
                    try
                    {
                        if (p != null)
                        {
                            p.Text = text.ToString().Trim();
                            subtitle.Paragraphs.Add(p);
                        }
                        string[] arr = s.Split(new[] { '\t' }, StringSplitOptions.RemoveEmptyEntries);
                        text.Clear();
                        p = new Paragraph(DecodeTimeCode(arr[0]), DecodeTimeCode(arr[1]), "");
                    }
                    catch
                    {
                        _errorCount++;
                        p = null;
                    }
                }
                else if (p != null)
                {
                    text.AppendLine(s);
                }
                else
                {
                    _errorCount++;
                }
            }
            if (p != null && text.Length > 0)
            {
                p.Text = text.ToString().Trim();
                subtitle.Paragraphs.Add(p);
            }
            subtitle.Renumber();
        }

    }
}