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

namespace Nikse.SubtitleEdit.Core.SubtitleFormats
{
    public class Wsb : SubtitleFormat
    {
        public override string Extension
        {
            get { return ".WSB"; }
        }

        public override string Name
        {
            get { return "WSB"; }
        }

        public override bool IsTimeBased
        {
            get { return true; }
        }

        public override bool IsMine(List<string> lines, string fileName)
        {
            var subtitle = new Subtitle();

            var sb = new StringBuilder();
            foreach (string line in lines)
                sb.AppendLine(line);

            LoadSubtitle(subtitle, lines, fileName);
            return subtitle.Paragraphs.Count > _errorCount;
        }

        public override string ToText(Subtitle subtitle, string title)
        {
            var sb = new StringBuilder();
            int index = 0;
            foreach (Paragraph p in subtitle.Paragraphs)
            {
                sb.AppendLine(string.Format("{0:0000} : {1},{2},10", index + 1, EncodeTimeCode(p.StartTime), EncodeTimeCode(p.EndTime)));
                sb.AppendLine("80 80 80");
                foreach (string line in p.Text.SplitToLines())
                    sb.AppendLine("C1Y00 " + line.Trim());
                sb.AppendLine();
                index++;
            }
            return sb.ToString();
        }

        private static string EncodeTimeCode(TimeCode time)
        {
            //00:03:15:22 (last is frame)
            return string.Format("{0:00}{1:00}{2:00}{3:00}", time.Hours, time.Minutes, time.Seconds, MillisecondsToFramesMaxFrameRate(time.Milliseconds));
        }

        public override void LoadSubtitle(Subtitle subtitle, List<string> lines, string fileName)
        {
            //01072508010729007
            _errorCount = 0;
            Paragraph p = null;
            subtitle.Paragraphs.Clear();
            subtitle.Header = null;
            foreach (string line in lines)
            {
                if (string.IsNullOrWhiteSpace(line))
                {
                    continue;
                }

                var indexOf7001 = line.IndexOf("7\x01\x01\0", StringComparison.Ordinal);
                var indexOfTen = line.IndexOf("     10     ", StringComparison.Ordinal);
                if (indexOf7001 >= 0 && indexOfTen > 0)
                {
                    try
                    {
                        string text = line.Substring(0, indexOfTen).Trim();
                        string time = line.Substring(indexOf7001 - 16, 16);
                        p = new Paragraph(DecodeTimeCode(time.Substring(0, 8)), DecodeTimeCode(time.Substring(8)), text);
                        subtitle.Paragraphs.Add(p);
                    }
                    catch (Exception exception)
                    {
                        System.Diagnostics.Debug.WriteLine(exception.Message);
                        _errorCount++;
                    }
                }
                else if (p != null)
                {
                    _errorCount++;
                }
            }
            if (p != null && !string.IsNullOrEmpty(p.Text))
                subtitle.Paragraphs.Add(p);

            subtitle.Renumber();
        }

        private static TimeCode DecodeTimeCode(string time)
        {
            //00:00:07:12
            string hour = time.Substring(0, 2);
            string minutes = time.Substring(2, 2);
            string seconds = time.Substring(4, 2);
            string frames = time.Substring(6, 2);

            return new TimeCode(int.Parse(hour), int.Parse(minutes), int.Parse(seconds), FramesToMillisecondsMax999(int.Parse(frames)));
        }

    }
}