/* ownCloud Android client application
 *   Copyright (C) 2011  Bartek Przybylski
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

package com.owncloud.android.ui.activity;

import java.io.File;

import android.content.Intent;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.TextView;

import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.app.ActionBar.OnNavigationListener;
import com.actionbarsherlock.app.SherlockFragmentActivity;
import com.actionbarsherlock.view.MenuItem;
import com.owncloud.android.ui.fragment.LocalFileListFragment;

import com.owncloud.android.R;

/**
 * Displays local files and let the user choose what of them wants to upload
 * to the current ownCloud account
 * 
 * @author David A. Velasco
 * 
 */

public class UploadFilesActivity extends SherlockFragmentActivity implements
    LocalFileListFragment.ContainerActivity, OnNavigationListener, OnClickListener {
    
    private ArrayAdapter<String> mDirectories;
    private File mCurrentDir = null;
    private LocalFileListFragment mFileListFragment;
    private Button mCancelBtn;
    private Button mUploadBtn;
    
    public static final String EXTRA_DIRECTORY_PATH = "com.owncloud.android.Directory"; 
    public static final String EXTRA_CHOSEN_FILES = "com.owncloud.android.ChosenFiles";
    
    private static final String TAG = "UploadFilesActivity";
    
    
    @Override
    public void onCreate(Bundle savedInstanceState) {
        Log.d(TAG, "onCreate() start");
        super.onCreate(savedInstanceState);

        if(savedInstanceState != null) {
            mCurrentDir = new File(savedInstanceState.getString(UploadFilesActivity.EXTRA_DIRECTORY_PATH));
        } else {
            mCurrentDir = Environment.getExternalStorageDirectory();
        }
        
        /// USER INTERFACE
            
        // Drop-down navigation 
        mDirectories = new CustomArrayAdapter<String>(this, R.layout.sherlock_spinner_dropdown_item);
        File currDir = mCurrentDir;
        while(currDir != null && currDir.getParentFile() != null) {
            mDirectories.add(currDir.getName());
            currDir = currDir.getParentFile();
        }
        mDirectories.add(File.separator);

        // Inflate and set the layout view
        setContentView(R.layout.upload_files_layout);
        mFileListFragment = (LocalFileListFragment) getSupportFragmentManager().findFragmentById(R.id.local_files_list);
        
        
        // Set input controllers
        mCancelBtn = (Button) findViewById(R.id.upload_files_btn_cancel);
        mCancelBtn.setOnClickListener(this);
        mUploadBtn = (Button) findViewById(R.id.upload_files_btn_upload);
        mUploadBtn.setOnClickListener(this);
            
        // Action bar setup
        ActionBar actionBar = getSupportActionBar();
        actionBar.setHomeButtonEnabled(true);   // mandatory since Android ICS, according to the official documentation
        actionBar.setDisplayHomeAsUpEnabled(mCurrentDir != null && mCurrentDir.getName() != null);
        actionBar.setDisplayShowTitleEnabled(false);
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
        actionBar.setListNavigationCallbacks(mDirectories, this);
            
        Log.d(TAG, "onCreate() end");
    }


    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        boolean retval = true;
        switch (item.getItemId()) {
            case android.R.id.home: {
                if(mCurrentDir != null && mCurrentDir.getParentFile() != null){
                    onBackPressed(); 
                }
                break;
            }
            default:
                retval = onOptionsItemSelected(item);
        }
        return retval;
    }

    
    @Override
    public boolean onNavigationItemSelected(int itemPosition, long itemId) {
        int i = itemPosition;
        while (i-- != 0) {
            onBackPressed();
        }
        // the next operation triggers a new call to this method, but it's necessary to 
        // ensure that the name exposed in the action bar is the current directory when the 
        // user selected it in the navigation list
        if (itemPosition != 0)
            getSupportActionBar().setSelectedNavigationItem(0);
        return true;
    }

    
    @Override
    public void onBackPressed() {
        if (mDirectories.getCount() <= 1) {
            finish();
            return;
        }
        popDirname();
        mFileListFragment.onNavigateUp();
        mCurrentDir = mFileListFragment.getCurrentDirectory();
        
        if(mCurrentDir.getParentFile() == null){
            ActionBar actionBar = getSupportActionBar(); 
            actionBar.setDisplayHomeAsUpEnabled(false);
        } 
    }

    
    @Override
    protected void onSaveInstanceState(Bundle outState) {
        // responsibility of restore is preferred in onCreate() before than in onRestoreInstanceState when there are Fragments involved
        Log.d(TAG, "onSaveInstanceState() start");
        super.onSaveInstanceState(outState);
        outState.putString(UploadFilesActivity.EXTRA_DIRECTORY_PATH, mCurrentDir.getAbsolutePath());
        Log.d(TAG, "onSaveInstanceState() end");
    }

    
    /**
     * Pushes a directory to the drop down list
     * @param directory to push
     * @throws IllegalArgumentException If the {@link File#isDirectory()} returns false.
     */
    public void pushDirname(File directory) {
        if(!directory.isDirectory()){
            throw new IllegalArgumentException("Only directories may be pushed!");
        }
        mDirectories.insert(directory.getName(), 0);
        mCurrentDir = directory;
    }

    /**
     * Pops a directory name from the drop down list
     * @return True, unless the stack is empty
     */
    public boolean popDirname() {
        mDirectories.remove(mDirectories.getItem(0));
        return !mDirectories.isEmpty();
    }

    
    // Custom array adapter to override text colors
    private class CustomArrayAdapter<T> extends ArrayAdapter<T> {
    
        public CustomArrayAdapter(UploadFilesActivity ctx, int view) {
            super(ctx, view);
        }
    
        public View getView(int position, View convertView, ViewGroup parent) {
            View v = super.getView(position, convertView, parent);
    
            ((TextView) v).setTextColor(getResources().getColorStateList(
                    android.R.color.white));
            return v;
        }
    
        public View getDropDownView(int position, View convertView,
                ViewGroup parent) {
            View v = super.getDropDownView(position, convertView, parent);
    
            ((TextView) v).setTextColor(getResources().getColorStateList(
                    android.R.color.white));
    
            return v;
        }
    
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void onDirectoryClick(File directory) {
        pushDirname(directory);
        ActionBar actionBar = getSupportActionBar();
        actionBar.setDisplayHomeAsUpEnabled(true);
    }
    
    
    /**
     * {@inheritDoc}
     */
    @Override
    public void onFileClick(File file) {
        // nothing to do
    }
    
    /**
     * {@inheritDoc}
     */
    @Override
    public File getInitialDirectory() {
        return mCurrentDir;
    }


    /**
     * Performs corresponding action when user presses 'Cancel' or 'Upload' button
     */
    @Override
    public void onClick(View v) {
        if (v.getId() == R.id.upload_files_btn_cancel) {
            setResult(RESULT_CANCELED);
            finish();
            
        } else if (v.getId() == R.id.upload_files_btn_upload) {
            Intent data = new Intent();
            data.putExtra(EXTRA_CHOSEN_FILES, mFileListFragment.getCheckedFilePaths());
            setResult(RESULT_OK, data);
            finish();
        }
    }
    
}