package ve.gob.cenditel.tibisaymovil;

import java.io.File;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

/**
 * Activity to select a single PKCS12 file, browsing the file system.
 *
 * @author José M. Prieto (jmprieto@emergya.com)
 */
public class PKCS12FilePickerActivity extends Activity
implements OnItemClickListener {

    private File cwd;
    private FileBrowserView viewHolder;
    private FileListAdapter listAdapter;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        PKCS12FilePickerActivity.this.viewHolder = new FileBrowserView();
        PKCS12FilePickerActivity.this.viewHolder.fileList.setAdapter(
                PKCS12FilePickerActivity.this.listAdapter = new FileListAdapter());
    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

        this.listAdapter.select((ListView) parent, position);
    }

    @Override
    public void onBackPressed() {
        if ("/".equals(this.cwd.getAbsolutePath())) {
            super.onBackPressed();
        } else {
            this.viewHolder.fileList.setAdapter(this.listAdapter = new FileListAdapter(cwd.getParent()));
        }
    }

    @Override
    protected void onPause() {

        super.onPause();
        // TODO Auto-generated method stub
    }

    @Override
    protected void onResume() {

        super.onResume();
        // TODO Auto-generated method stub
    }

    /**
     * Provides the data to be shown in the file browser ListView.
     *
     * @author José M. Prieto (jmprieto@emergya.com)
     */
    private class FileListAdapter extends BaseAdapter {

        private final List<File> directories;
        private final List<File> files;

        private FileListAdapter() {
            this(Environment.getExternalStorageDirectory().getAbsolutePath());
        }

        private FileListAdapter(String location) {

            PKCS12FilePickerActivity.this.viewHolder.path.setText(location);

            directories = new ArrayList<File>();
            files = new ArrayList<File>();

            PKCS12FilePickerActivity.this.cwd = new File(location);
            File parent = PKCS12FilePickerActivity.this.cwd.getParentFile();
            if (parent != null) {
                directories.add(0, parent);
            }

            File[] ls = PKCS12FilePickerActivity.this.cwd.listFiles();
            if (ls != null) {
                for (File f : ls) {
                    if (FsUtils.isHiddenOrNotReadable(f)) {
                        continue;
                    }
                    if (f.isDirectory()) {
                        directories.add(f);
                    } else {
                        String name = f.getName();
                        if (name.length() >= 4) {
                            String extension = f.getName().substring(f.getName().length() - 4);
                            if (extension.equalsIgnoreCase(".p12") || extension.equalsIgnoreCase(".pfx") || true) {
                                files.add(f);
                            }
                        }
                    }
                }
            }

            Collections.sort(directories);
            Collections.sort(files);
        }

        @Override
        public int getCount() {

            return directories.size() + files.size();
        }

        @Override
        public File getItem(int position) {

            if (position < directories.size()) {
                return directories.get(position);
            } else {
                return files.get(position - directories.size());
            }
        }

        @Override
        public long getItemId(int position) {

            return getItem(position).hashCode();
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {

            if (convertView == null) {
                LayoutInflater inflater = LayoutInflater.from(PKCS12FilePickerActivity.this);
                //TODO: CANT USE THE SAME LAYOUT AS FILEBROWSER
                convertView = inflater.inflate(R.layout.cert_browser_item, parent, false);
            }
            
            
            ImageView image = (ImageView) convertView.findViewById(R.id.type_image);
            TextView fileName = (TextView) convertView.findViewById(R.id.filename_text);
            File file = getItem(position);

            if (file.isDirectory()) {
                //image.setImageResource(R.drawable.ico_carpeta);
                image.setImageResource(R.drawable.ic_carpeta);
            } else {
                //image.setImageResource(R.drawable.ico_archivo);
                image.setImageResource(R.drawable.ic_archivo);
            }

            if (file.isDirectory() && position == 0 && ! "/".equals(PKCS12FilePickerActivity.this.cwd.getAbsolutePath())) {
                fileName.setText("..");
            } else {
                fileName.setText(file.getName());
            }

            return convertView;
        }

        /**
         * Select a file. If the file is a directory, list files in that directory, else hide the file and add it to
         * the list of selected files.
         *
         * @param parent the ListView
         * @param position index of the file to remove
         */
        public void select(ListView parent, int position) {

            final File item = getItem(position);
            if (item.isDirectory()) {
                parent.setAdapter(PKCS12FilePickerActivity.this.listAdapter = new FileListAdapter(item.getAbsolutePath()));
            } else {
                PKCS12FilePickerActivity.this.setResult(Activity.RESULT_OK, new Intent() {{ setData(Uri.fromFile(item)); }});
                PKCS12FilePickerActivity.this.finish();
           }
        }
    }

    /**
     * Holds references to view objects.
     *
     * @author José M. Prieto (jmprieto@emergya.com)
     */
    private class FileBrowserView {

        public ListView fileList;
        public TextView path;

        public FileBrowserView() {

            setContentView(R.layout.single_file_browser);
            this.path = (TextView) findViewById(R.id.path);
            this.fileList = (ListView) findViewById(R.id.file_list);
            this.fileList.setOnItemClickListener(PKCS12FilePickerActivity.this);
        }
    }
}