package org.jcodec.movtool;

import java.io.File;
import java.nio.channels.FileChannel;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.LinkedList;
import java.util.List;
import org.jcodec.containers.mp4.boxes.MovieBox;

public class QTEdit {
  protected final EditFactory[] factories;
  
  private final List<Flatten.ProgressListener> listeners;
  
  public static abstract class BaseCommand implements MP4Edit {
    public void applyRefs(MovieBox movie, FileChannel[][] refs) {
      apply(movie);
    }
    
    public abstract void apply(MovieBox param1MovieBox);
  }
  
  public QTEdit(EditFactory[] editFactories) {
    this.listeners = new ArrayList<>();
    this.factories = editFactories;
  }
  
  public void addProgressListener(Flatten.ProgressListener listener) {
    this.listeners.add(listener);
  }
  
  public void execute(String[] args) throws Exception {
    LinkedList<String> aa = new LinkedList<>(Arrays.asList(args));
    List<MP4Edit> commands = new LinkedList<>();
    while (aa.size() > 0) {
      int i;
      for (i = 0; i < this.factories.length; i++) {
        if (aa.get(0).equals(this.factories[i].getName())) {
          aa.remove(0);
          try {
            commands.add(this.factories[i].parseArgs(aa));
          } catch (Exception e) {
            System.err.println("ERROR: " + e.getMessage());
            return;
          } 
          break;
        } 
      } 
      if (i == this.factories.length)
        break; 
    } 
    if (aa.size() == 0) {
      System.err.println("ERROR: A movie file should be specified");
      help();
    } 
    if (commands.size() == 0) {
      System.err.println("ERROR: At least one command should be specified");
      help();
    } 
    File input = new File((String)aa.remove(0));
    if (!input.exists()) {
      System.err.println("ERROR: Input file '" + input.getAbsolutePath() + "' doesn't exist");
      help();
    } 
    new ReplaceMP4Editor().replace(input, new CompoundMP4Edit(commands));
  }
  
  protected void help() {
    System.out.println("Quicktime movie editor");
    System.out.println("Syntax: qtedit <command1> <options> ... <commandN> <options> <movie>");
    System.out.println("Where options:");
    for (EditFactory commandFactory : this.factories)
      System.out.println("\t" + commandFactory.getHelp()); 
    System.exit(-1);
  }
  
  public static interface EditFactory {
    String getName();
    
    MP4Edit parseArgs(List<String> param1List);
    
    String getHelp();
  }
}