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

namespace Nikse.SubtitleEdit.Core.SubtitleFormats
{
    public class SonyDVDArchitectExplicitDuration : SubtitleFormat
    {
        private static readonly Regex Regex = new Regex(@"^\d\d:\d\d:\d\d\.\d\d\d[ \t]+\d\d:\d\d:\d\d\.\d\d\d[ \t]+\d\d:\d\d:\d\d\.\d\d\d[ \t]+", RegexOptions.Compiled);

        public override string Extension => ".sub";

        public override string Name => "Sony DVDArchitect Explicit duration";

        public override string ToText(Subtitle subtitle, string title)
        {
            var sb = new StringBuilder();
            const string writeFormat = "{0:00}:{1:00}:{2:00}.{3:000}\t{4:00}:{5:00}:{6:00}.{7:000}\t{8:00}:{9:00}:{10:00}.{11:000}\t{12}";
            foreach (Paragraph p in subtitle.Paragraphs)
            {
                string text = HtmlUtil.RemoveHtmlTags(p.Text);
                text = text.Replace(Environment.NewLine, "\r");
                sb.AppendLine(string.Format(writeFormat, p.StartTime.Hours, p.StartTime.Minutes, p.StartTime.Seconds, p.StartTime.Milliseconds,
                                            p.EndTime.Hours, p.EndTime.Minutes, p.EndTime.Seconds, p.EndTime.Milliseconds,
                                            p.Duration.Hours, p.Duration.Minutes, p.Duration.Seconds, p.Duration.Milliseconds,
                                            text));
            }
            return sb.ToString().Trim() + Environment.NewLine + Environment.NewLine + Environment.NewLine;
        }

        public override void LoadSubtitle(Subtitle subtitle, List<string> lines, string fileName)
        {   //00:02:10.354  00:02:13.047    00:00:02.693    Her er endnu en tekstfil fra DVD-Architect.Med 2 linier.
            //00:02:14.018  00:02:19.018    00:00:05.000    - Prøvetekst 2- Linie 2
            //newline = \r (0D)

            _errorCount = 0;
            Paragraph lastParagraph = null;
            foreach (string line in lines)
            {
                if (string.IsNullOrWhiteSpace(line))
                {
                    continue;
                }

                string s = line;
                bool success = false;
                bool isTimeCode = false;

                if (s.Length > 26 && s.IndexOf(':') == 2)
                {
                    var match = Regex.Match(s);
                    if (match.Success)
                    {
                        isTimeCode = true;
                        s = s.Substring(0, match.Length);
                        s = s.Replace('\t', ':');
                        s = s.Replace('.', ':');
                        s = s.RemoveChar(' ');
                        s = s.Trim().TrimEnd(':').TrimEnd();
                        string[] parts = s.Split(':');
                        if (parts.Length == 12)
                        {
                            int hours = int.Parse(parts[0]);
                            int minutes = int.Parse(parts[1]);
                            int seconds = int.Parse(parts[2]);
                            int milliseconds = int.Parse(parts[3]);
                            var start = new TimeCode(hours, minutes, seconds, milliseconds);

                            hours = int.Parse(parts[4]);
                            minutes = int.Parse(parts[5]);
                            seconds = int.Parse(parts[6]);
                            milliseconds = int.Parse(parts[7]);
                            var end = new TimeCode(hours, minutes, seconds, milliseconds);

                            string text = line.Substring(match.Length).TrimStart();
                            text = text.Replace("|", Environment.NewLine);

                            lastParagraph = new Paragraph(start, end, text);
                            subtitle.Paragraphs.Add(lastParagraph);
                            success = true;
                        }
                    }
                }
                if (!isTimeCode && lastParagraph != null && Utilities.GetNumberOfLines(lastParagraph.Text) < 5)
                {
                    lastParagraph.Text += Environment.NewLine + line.Trim();
                    success = true;
                }
                if (!success)
                {
                    _errorCount++;
                }
            }
            subtitle.Renumber();
        }
    }
}