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

namespace Nikse.SubtitleEdit.Core.SubtitleFormats
{
    public class FinalCutProXmlGap : SubtitleFormat
    {
        public double FrameRate { get; set; }

        public override string Extension => ".fcpxml";

        public override string Name => "Final Cut Xml Gap";

        public override string ToText(Subtitle subtitle, string title)
        {
            if (Configuration.Settings.General.CurrentFrameRate > 26)
            {
                FrameRate = 30;
            }
            else
            {
                FrameRate = 25;
            }

            string xmlStructure =
                "<?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>" + Environment.NewLine +
                "<!DOCTYPE fcpxml>" + Environment.NewLine +
                Environment.NewLine +
                "<fcpxml version=\"1.2\">" + Environment.NewLine +
                "  <project name=\"Subtitle Edit subtitle\" uid=\"C1E80D31-57D4-4E6C-84F6-86A75DCB7A54\" eventID=\"B5C98F73-1D7E-4205-AEF3-1485842EB191\" location=\"file://localhost/Volumes/Macintosh%20HD/Final%20Cut%20Projects/Yma%20Sumac/Yma%20LIVE%20in%20Moscow/\" >" + Environment.NewLine +
                "    <resources>" + Environment.NewLine +
                "      <format id=\"r1\" name=\"FFVideoFormatDV720x480i5994\" frameDuration=\"2002/60000s\" fieldOrder=\"lower first\" width=\"720\" height=\"480\" paspH=\"10\" paspV=\"11\"/>" + Environment.NewLine +
                //<projectRef id="r2" name="Yma DVD" uid="B5C98F73-1D7E-4205-AEF3-1485842EB191"/>
                //<asset id="r3" name="Live In Moscow MERGED-quicktime" uid="E2951D8A4091478C718D981E70B29220" projectRef="r2" src="file://localhost/Volumes/Macintosh%20HD/Final%20Cut%20Events/Yma%20DVD/Original%20Media/Live%20In%20Moscow%20MERGED-quicktime.mov" start="0s" duration="128865737/30000s" hasVideo="1"/>
                //<format id="r4" name="FFVideoFormatRateUndefined" width="640" height="480"/>
                //<asset id="r5" name="Moscow opening credit frame 2" uid="492B77C679B1EEDA87E214703CD9B236" projectRef="r2" src="file://localhost/Volumes/Macintosh%20HD/Final%20Cut%20Events/Yma%20DVD/Original%20Media/Moscow%20opening%20credit%20frame%202.png" start="0s" duration="0s" hasVideo="1"/>
                "      <effect id=\"r6\" name=\"Custom\" uid=\".../Titles.localized/Build In:Out.localized/Custom.localized/Custom.moti\"/>" + Environment.NewLine +
                "    </resources>" + Environment.NewLine +
                "    <sequence duration=\"10282752480/2400000s\" format=\"r1\" tcStart=\"0s\" tcFormat=\"NDF\" audioLayout=\"stereo\" audioRate=\"48k\">" + Environment.NewLine +
                "      <spine>" + Environment.NewLine +
                "        <gap offset=\"0s\" name=\"Espace\" duration=\"645900/2500s\" start=\"0s\"></gap>" + Environment.NewLine +
                "      </spine>" + Environment.NewLine +
                "    </sequence>" + Environment.NewLine +
                "  </project>" + Environment.NewLine +
                "</fcpxml>";

            string xmlClipStructure =
                "  <title lane=\"6\" offset=\"4130126/60000s\" ref=\"r1\" name=\"\" duration=\"288288/60000s\" start=\"216003788/60000s\" role=\"Subtitles\">" + Environment.NewLine +
                "    <adjust-transform position=\"0.267518 -32.3158\"/>" + Environment.NewLine +
                "    <text></text>" + Environment.NewLine +
                "  </title>";

            var xml = new XmlDocument();
            xml.LoadXml(xmlStructure);

            XmlNode videoNode = xml.DocumentElement.SelectSingleNode("project/sequence/spine/gap");

            int number = 1;
            foreach (Paragraph p in subtitle.Paragraphs)
            {
                XmlNode titleNode = xml.CreateElement("holder");
                titleNode.InnerXml = xmlClipStructure;
                titleNode = titleNode.SelectSingleNode("title");
                titleNode.Attributes["offset"].Value = Convert.ToInt64(p.StartTime.TotalSeconds * 60000) + "/60000s";
                titleNode.Attributes["name"].Value = HtmlUtil.RemoveHtmlTags(p.Text);
                titleNode.Attributes["duration"].Value = Convert.ToInt64(p.Duration.TotalSeconds * 60000) + "/60000s";
                titleNode.Attributes["start"].Value = Convert.ToInt64(p.StartTime.TotalSeconds * 60000) + "/60000s";
                titleNode.SelectSingleNode("text").InnerText = HtmlUtil.RemoveHtmlTags(p.Text);
                videoNode.AppendChild(titleNode);
                number++;
            }

            string xmlAsText = ToUtf8XmlString(xml);
            xmlAsText = xmlAsText.Replace("fcpxml[]", "fcpxml");
            xmlAsText = xmlAsText.Replace("fcpxml []", "fcpxml");
            return xmlAsText;
        }

        public override void LoadSubtitle(Subtitle subtitle, List<string> lines, string fileName)
        {
            _errorCount = 0;
            FrameRate = Configuration.Settings.General.CurrentFrameRate;

            var sb = new StringBuilder();
            lines.ForEach(line => sb.AppendLine(line));
            var xml = new XmlDocument { XmlResolver = null };
            try
            {
                xml.LoadXml(sb.ToString().Trim());

                foreach (XmlNode node in xml.SelectNodes("fcpxml/project/sequence/spine/gap"))
                {
                    try
                    {
                        foreach (XmlNode title in node.SelectNodes("title"))
                        {
                            var textNodes = title.SelectNodes("text");
                            if (textNodes != null && textNodes.Count > 0)
                            {
                                Paragraph p = new Paragraph();
                                p.StartTime = DecodeTime(title.Attributes["offset"]);
                                p.EndTime.TotalMilliseconds = p.StartTime.TotalMilliseconds + DecodeTime(title.Attributes["duration"]).TotalMilliseconds;
                                var text = new StringBuilder();
                                foreach (XmlNode textNode in textNodes)
                                {
                                    text.AppendLine(textNode.InnerText);
                                }
                                p.Text = text.ToString().Trim();
                                subtitle.Paragraphs.Add(p);
                            }
                        }
                    }
                    catch
                    {
                        _errorCount++;
                    }
                }
                subtitle.Renumber();
            }
            catch
            {
                _errorCount = 1;
                return;
            }
        }

        private static TimeCode DecodeTime(XmlAttribute duration)
        {
            // 220220/60000s
            if (duration != null)
            {
                var arr = duration.Value.TrimEnd('s').Split('/');
                if (arr.Length == 2)
                {
                    return TimeCode.FromSeconds(long.Parse(arr[0]) / double.Parse(arr[1]));
                }
                else if (arr.Length == 1)
                {
                    return TimeCode.FromSeconds(float.Parse(arr[0]));
                }
            }
            return new TimeCode();
        }

    }
}