/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.gallery3d.ui;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnCancelListener;
import android.content.DialogInterface.OnClickListener;
import android.content.Intent;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.MenuItem;

import com.android.gallery3d.R;
import com.android.gallery3d.app.CropImage;
import com.android.gallery3d.app.GalleryActivity;
import com.android.gallery3d.common.Utils;
import com.android.gallery3d.data.DataManager;
import com.android.gallery3d.data.MediaItem;
import com.android.gallery3d.data.MediaObject;
import com.android.gallery3d.data.Path;
import com.android.gallery3d.util.Future;
import com.android.gallery3d.util.GalleryUtils;
import com.android.gallery3d.util.ThreadPool.Job;
import com.android.gallery3d.util.ThreadPool.JobContext;

import java.util.ArrayList;

public class MenuExecutor {
    @SuppressWarnings("unused")
    private static final String TAG = "MenuExecutor";

    private static final int MSG_TASK_COMPLETE = 1;
    private static final int MSG_TASK_UPDATE = 2;
    private static final int MSG_DO_SHARE = 3;

    public static final int EXECUTION_RESULT_SUCCESS = 1;
    public static final int EXECUTION_RESULT_FAIL = 2;
    public static final int EXECUTION_RESULT_CANCEL = 3;

    private ProgressDialog mDialog;
    private Future<?> mTask;
    // wait the operation to finish when we want to stop it.
    private boolean mWaitOnStop;

    private final GalleryActivity mActivity;
    private final SelectionManager mSelectionManager;
    private final Handler mHandler;

    private static ProgressDialog createProgressDialog(
            Context context, int titleId, int progressMax) {
        ProgressDialog dialog = new ProgressDialog(context);
        dialog.setTitle(titleId);
        dialog.setMax(progressMax);
        dialog.setCancelable(false);
        dialog.setIndeterminate(false);
        if (progressMax > 1) {
            dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        }
        return dialog;
    }

    public interface ProgressListener {
        public void onConfirmDialogShown();
        public void onConfirmDialogDismissed(boolean confirmed);
        public void onProgressUpdate(int index);
        public void onProgressComplete(int result);
    }

    public MenuExecutor(
            GalleryActivity activity, SelectionManager selectionManager) {
        mActivity = Utils.checkNotNull(activity);
        mSelectionManager = Utils.checkNotNull(selectionManager);
        mHandler = new SynchronizedHandler(mActivity.getGLRoot()) {
            @Override
            public void handleMessage(Message message) {
                switch (message.what) {
                    case MSG_TASK_COMPLETE: {
                        stopTaskAndDismissDialog();
                        if (message.obj != null) {
                            ProgressListener listener = (ProgressListener) message.obj;
                            listener.onProgressComplete(message.arg1);
                        }
                        mSelectionManager.leaveSelectionMode();
                        break;
                    }
                    case MSG_TASK_UPDATE: {
                        if (mDialog != null) mDialog.setProgress(message.arg1);
                        if (message.obj != null) {
                            ProgressListener listener = (ProgressListener) message.obj;
                            listener.onProgressUpdate(message.arg1);
                        }
                        break;
                    }
                    case MSG_DO_SHARE: {
                        ((Activity) mActivity).startActivity((Intent) message.obj);
                        break;
                    }
                }
            }
        };
    }

    private void stopTaskAndDismissDialog() {
        if (mTask != null) {
            if (!mWaitOnStop) mTask.cancel();
            mTask.waitDone();
            mDialog.dismiss();
            mDialog = null;
            mTask = null;
        }
    }

    public void pause() {
        stopTaskAndDismissDialog();
    }

    private void onProgressUpdate(int index, ProgressListener listener) {
        mHandler.sendMessage(
                mHandler.obtainMessage(MSG_TASK_UPDATE, index, 0, listener));
    }

    private void onProgressComplete(int result, ProgressListener listener) {
        mHandler.sendMessage(mHandler.obtainMessage(MSG_TASK_COMPLETE, result, 0, listener));
    }

    private static void setMenuItemVisibility(
            Menu menu, int id, boolean visibility) {
        MenuItem item = menu.findItem(id);
        if (item != null) item.setVisible(visibility);
    }

    public static void updateMenuOperation(Menu menu, int supported) {
        boolean supportDelete = (supported & MediaObject.SUPPORT_DELETE) != 0;
        boolean supportRotate = (supported & MediaObject.SUPPORT_ROTATE) != 0;
        boolean supportCrop = (supported & MediaObject.SUPPORT_CROP) != 0;
        boolean supportShare = (supported & MediaObject.SUPPORT_SHARE) != 0;
        boolean supportSetAs = (supported & MediaObject.SUPPORT_SETAS) != 0;
        boolean supportShowOnMap = (supported & MediaObject.SUPPORT_SHOW_ON_MAP) != 0;
        boolean supportCache = (supported & MediaObject.SUPPORT_CACHE) != 0;
        boolean supportEdit = (supported & MediaObject.SUPPORT_EDIT) != 0;
        boolean supportInfo = (supported & MediaObject.SUPPORT_INFO) != 0;
        boolean supportImport = (supported & MediaObject.SUPPORT_IMPORT) != 0;

        setMenuItemVisibility(menu, R.id.action_delete, supportDelete);
        setMenuItemVisibility(menu, R.id.action_rotate_ccw, supportRotate);
        setMenuItemVisibility(menu, R.id.action_rotate_cw, supportRotate);
        setMenuItemVisibility(menu, R.id.action_crop, supportCrop);
        setMenuItemVisibility(menu, R.id.action_share, supportShare);
        setMenuItemVisibility(menu, R.id.action_setas, supportSetAs);
        setMenuItemVisibility(menu, R.id.action_show_on_map, supportShowOnMap);
        setMenuItemVisibility(menu, R.id.action_edit, supportEdit);
        setMenuItemVisibility(menu, R.id.action_details, supportInfo);
        setMenuItemVisibility(menu, R.id.action_import, supportImport);
    }

    private Path getSingleSelectedPath() {
        ArrayList<Path> ids = mSelectionManager.getSelected(true);
        Utils.assertTrue(ids.size() == 1);
        return ids.get(0);
    }

    private Intent getIntentBySingleSelectedPath(String action) {
        DataManager manager = mActivity.getDataManager();
        Path path = getSingleSelectedPath();
        String mimeType = getMimeType(manager.getMediaType(path));
        return new Intent(action).setDataAndType(manager.getContentUri(path), mimeType);
    }

    private void onMenuClicked(int action, ProgressListener listener) {
        onMenuClicked(action, listener, false, true);
    }

    public void onMenuClicked(int action, ProgressListener listener,
            boolean waitOnStop, boolean showDialog) {
        int title;
        switch (action) {
            case R.id.action_select_all:
                if (mSelectionManager.inSelectAllMode()) {
                    mSelectionManager.deSelectAll();
                } else {
                    mSelectionManager.selectAll();
                }
                return;
            case R.id.action_crop: {
                Intent intent = getIntentBySingleSelectedPath(CropImage.ACTION_CROP);
                ((Activity) mActivity).startActivity(intent);
                return;
            }
            case R.id.action_edit: {
                Intent intent = getIntentBySingleSelectedPath(Intent.ACTION_EDIT)
                        .setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                ((Activity) mActivity).startActivity(Intent.createChooser(intent, null));
                return;
            }
            case R.id.action_setas: {
                Intent intent = getIntentBySingleSelectedPath(Intent.ACTION_ATTACH_DATA)
                        .addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                intent.putExtra("mimeType", intent.getType());
                Activity activity = (Activity) mActivity;
                activity.startActivity(Intent.createChooser(
                        intent, activity.getString(R.string.set_as)));
                return;
            }
            case R.id.action_delete:
                title = R.string.delete;
                break;
            case R.id.action_rotate_cw:
                title = R.string.rotate_right;
                break;
            case R.id.action_rotate_ccw:
                title = R.string.rotate_left;
                break;
            case R.id.action_show_on_map:
                title = R.string.show_on_map;
                break;
            case R.id.action_import:
                title = R.string.Import;
                break;
            default:
                return;
        }
        startAction(action, title, listener, waitOnStop, showDialog);
    }

    private class ConfirmDialogListener implements OnClickListener, OnCancelListener {
        private final int mActionId;
        private final ProgressListener mListener;

        public ConfirmDialogListener(int actionId, ProgressListener listener) {
            mActionId = actionId;
            mListener = listener;
        }

        @Override
        public void onClick(DialogInterface dialog, int which) {
            if (which == DialogInterface.BUTTON_POSITIVE) {
                if (mListener != null) {
                    mListener.onConfirmDialogDismissed(true);
                }
                onMenuClicked(mActionId, mListener);
            } else {
                if (mListener != null) {
                    mListener.onConfirmDialogDismissed(false);
                }
            }
        }

        @Override
        public void onCancel(DialogInterface dialog) {
            if (mListener != null) {
                mListener.onConfirmDialogDismissed(false);
            }
        }
    }

    public void onMenuClicked(MenuItem menuItem, String confirmMsg,
            final ProgressListener listener) {
        final int action = menuItem.getItemId();

        if (confirmMsg != null) {
            if (listener != null) listener.onConfirmDialogShown();
            ConfirmDialogListener cdl = new ConfirmDialogListener(action, listener);
            new AlertDialog.Builder(mActivity.getAndroidContext())
                    .setMessage(confirmMsg)
                    .setOnCancelListener(cdl)
                    .setPositiveButton(R.string.ok, cdl)
                    .setNegativeButton(R.string.cancel, cdl)
                    .create().show();
        } else {
            onMenuClicked(action, listener);
        }
    }

    public void startAction(int action, int title, ProgressListener listener) {
        startAction(action, title, listener, false, true);
    }

    public void startAction(int action, int title, ProgressListener listener,
            boolean waitOnStop, boolean showDialog) {
        ArrayList<Path> ids = mSelectionManager.getSelected(false);
        stopTaskAndDismissDialog();

        Activity activity = (Activity) mActivity;
        mDialog = createProgressDialog(activity, title, ids.size());
        if (showDialog) {
            mDialog.show();
        }
        MediaOperation operation = new MediaOperation(action, ids, listener);
        mTask = mActivity.getThreadPool().submit(operation, null);
        mWaitOnStop = waitOnStop;
    }

    public static String getMimeType(int type) {
        switch (type) {
            case MediaObject.MEDIA_TYPE_IMAGE :
                return "image/*";
            case MediaObject.MEDIA_TYPE_VIDEO :
                return "video/*";
            default: return "*/*";
        }
    }

    private boolean execute(
            DataManager manager, JobContext jc, int cmd, Path path) {
        boolean result = true;
        Log.v(TAG, "Execute cmd: " + cmd + " for " + path);
        long startTime = System.currentTimeMillis();

        switch (cmd) {
            case R.id.action_delete:
                manager.delete(path);
                break;
            case R.id.action_rotate_cw:
                manager.rotate(path, 90);
                break;
            case R.id.action_rotate_ccw:
                manager.rotate(path, -90);
                break;
            case R.id.action_toggle_full_caching: {
                MediaObject obj = manager.getMediaObject(path);
                int cacheFlag = obj.getCacheFlag();
                if (cacheFlag == MediaObject.CACHE_FLAG_FULL) {
                    cacheFlag = MediaObject.CACHE_FLAG_SCREENNAIL;
                } else {
                    cacheFlag = MediaObject.CACHE_FLAG_FULL;
                }
                obj.cache(cacheFlag);
                break;
            }
            case R.id.action_show_on_map: {
                MediaItem item = (MediaItem) manager.getMediaObject(path);
                double latlng[] = new double[2];
                item.getLatLong(latlng);
                if (GalleryUtils.isValidLocation(latlng[0], latlng[1])) {
                    GalleryUtils.showOnMap((Context) mActivity, latlng[0], latlng[1]);
                }
                break;
            }
            case R.id.action_import: {
                MediaObject obj = manager.getMediaObject(path);
                result = obj.Import();
                break;
            }
            default:
                throw new AssertionError();
        }
        Log.v(TAG, "It takes " + (System.currentTimeMillis() - startTime) +
                " ms to execute cmd for " + path);
        return result;
    }

    private class MediaOperation implements Job<Void> {
        private final ArrayList<Path> mItems;
        private final int mOperation;
        private final ProgressListener mListener;

        public MediaOperation(int operation, ArrayList<Path> items,
                ProgressListener listener) {
            mOperation = operation;
            mItems = items;
            mListener = listener;
        }

        public Void run(JobContext jc) {
            int index = 0;
            DataManager manager = mActivity.getDataManager();
            int result = EXECUTION_RESULT_SUCCESS;
            try {
                for (Path id : mItems) {
                    if (jc.isCancelled()) {
                        result = EXECUTION_RESULT_CANCEL;
                        break;
                    }
                    if (!execute(manager, jc, mOperation, id)) {
                        result = EXECUTION_RESULT_FAIL;
                    }
                    onProgressUpdate(index++, mListener);
                }
            } catch (Throwable th) {
                Log.e(TAG, "failed to execute operation " + mOperation
                        + " : " + th);
            } finally {
               onProgressComplete(result, mListener);
            }
            return null;
        }
    }
}