using System;
using System.IO;

using Gst;
using Gst.BasePlugins;
using Gst.CorePlugins;

public class MetaData {
    private static PlayBin2 playbin;
    private static FakeSink videoSink, audioSink;
    private static Pad pad;
    private static Caps caps;
    private static TagList tagList;

    public static void Main (string [] args) {
        Application.Init ();

        if (args.Length < 1) {
            Console.WriteLine ("Please give filenames to read metadata from\n\n");
            return;
        }

        string filename = args[0];

        playbin = new PlayBin2("play");
        videoSink = new FakeSink("video");
        audioSink = new FakeSink("audio");

        playbin.VideoSink = videoSink;
        playbin.AudioSink = audioSink;

        playbin.Uri = "file://" + filename;

        State state, pending;
        StateChangeReturn stateReturn = playbin.SetState(State.Paused);

        if (stateReturn == StateChangeReturn.Async) {
            if (StateChangeReturn.Success != playbin.GetState (out state, out pending, Clock.Second * 5)) {
                Console.WriteLine ("State change failed for {0}. Aborting\n", filename);
                return;
            }
        } else if (stateReturn != StateChangeReturn.Success) {
            Console.WriteLine ("{0} - Could not read file ({1})\n", filename, stateReturn);
            return;
        }

/*
        tagList = playbin.GetVideoTags(0);

        if (tagList != null) {
            Console.WriteLine ("TagList Empty?: {0}?", tagList.IsEmpty);
            Console.WriteLine ("Tag count: {0}?", tagList.Size);
            foreach(string tag in tagList.Tags) {
                Console.WriteLine ("Tag: {0}", tag);
            }

            tagList.Dispose();
        }
*/


        tagList = GetTagMessages(playbin);

        if (tagList != null) {
            Console.WriteLine ("Tag count: {0}", tagList.Size);

            foreach (string tag in tagList.Tags) {
                uint count = tagList.GetTagSize (tag);

                for (uint i = 0; i < count; i++) {
                    Console.WriteLine ("{0}: {1}", tag.PadRight (20), tagList[tag, i].ToString());
                }
            }

            tagList.Dispose();
        }

        pad = playbin.GetVideoPad(0);

        if (pad == null) {
            Console.WriteLine ("I didn't get a pad?\n\n");
            return;
        }

        caps = pad.NegotiatedCaps;

        if (caps.IsFixed) {
            foreach(Structure structure in caps) {
                foreach(string fieldName in structure.Fields) {
                    Console.WriteLine ("{0}: {1}", fieldName.PadRight (20), structure.GetValue(fieldName).Val.ToString());
                }
            }
        }

        stateReturn = playbin.SetState(State.Null);
        playbin.Dispose();
    }

    private static TagList GetTagMessages(Element playbin) {
        Bus bus = playbin.Bus;
        TagList tagList = null;
        bool done = false;

        while (!done) {
            Message message = bus.Pop ();

            if (message == null) {
                break;
            }

            if (message.Type == MessageType.Tag) {
                Pad pad;
                TagList newTags;

                message.ParseTag (out pad, out newTags);

                if (tagList != null) {
                    tagList = tagList.Merge (newTags, TagMergeMode.KeepAll);
                    newTags.Dispose ();
                } else {
                    tagList = newTags;
                }
            }

            message.Dispose ();
        }

        bus.Dispose ();
        return tagList;
    }
}