/*
 * 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.app;

import com.android.gallery3d.R;
import com.android.gallery3d.data.DataManager;
import com.android.gallery3d.data.MediaDetails;
import com.android.gallery3d.data.MediaItem;
import com.android.gallery3d.data.MediaObject;
import com.android.gallery3d.data.MediaSet;
import com.android.gallery3d.data.MtpDevice;
import com.android.gallery3d.data.Path;
import com.android.gallery3d.picasasource.PicasaSource;
import com.android.gallery3d.ui.DetailsHelper;
import com.android.gallery3d.ui.DetailsHelper.CloseListener;
import com.android.gallery3d.ui.DetailsHelper.DetailsSource;
import com.android.gallery3d.ui.FilmStripView;
import com.android.gallery3d.ui.GLCanvas;
import com.android.gallery3d.ui.GLView;
import com.android.gallery3d.ui.ImportCompleteListener;
import com.android.gallery3d.ui.MenuExecutor;
import com.android.gallery3d.ui.PhotoView;
import com.android.gallery3d.ui.PositionRepository;
import com.android.gallery3d.ui.PositionRepository.Position;
import com.android.gallery3d.ui.SelectionManager;
import com.android.gallery3d.ui.SynchronizedHandler;
import com.android.gallery3d.ui.UserInteractionListener;
import com.android.gallery3d.util.GalleryUtils;

import android.app.ActionBar;
import android.app.ActionBar.OnMenuVisibilityListener;
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.View.MeasureSpec;
import android.view.WindowManager;
import android.widget.ShareActionProvider;
import android.widget.Toast;

public class PhotoPage extends ActivityState
        implements PhotoView.PhotoTapListener, FilmStripView.Listener,
        UserInteractionListener {
    private static final String TAG = "PhotoPage";

    private static final int MSG_HIDE_BARS = 1;

    private static final int HIDE_BARS_TIMEOUT = 3500;

    private static final int REQUEST_SLIDESHOW = 1;
    private static final int REQUEST_CROP = 2;
    private static final int REQUEST_CROP_PICASA = 3;

    public static final String KEY_MEDIA_SET_PATH = "media-set-path";
    public static final String KEY_MEDIA_ITEM_PATH = "media-item-path";
    public static final String KEY_INDEX_HINT = "index-hint";

    private GalleryApp mApplication;
    private SelectionManager mSelectionManager;

    private PhotoView mPhotoView;
    private PhotoPage.Model mModel;
    private FilmStripView mFilmStripView;
    private DetailsHelper mDetailsHelper;
    private boolean mShowDetails;

    // mMediaSet could be null if there is no KEY_MEDIA_SET_PATH supplied.
    // E.g., viewing a photo in gmail attachment
    private MediaSet mMediaSet;
    private Menu mMenu;

    private Intent mResultIntent = new Intent();
    private int mCurrentIndex = 0;
    private Handler mHandler;
    private boolean mShowBars = true;
    private ActionBar mActionBar;
    private MyMenuVisibilityListener mMenuVisibilityListener;
    private boolean mIsMenuVisible;
    private boolean mIsInteracting;
    private MediaItem mCurrentPhoto = null;
    private MenuExecutor mMenuExecutor;
    private boolean mIsActive;
    private ShareActionProvider mShareActionProvider;

    public static interface Model extends PhotoView.Model {
        public void resume();
        public void pause();
        public boolean isEmpty();
        public MediaItem getCurrentMediaItem();
        public int getCurrentIndex();
        public void setCurrentPhoto(Path path, int indexHint);
    }

    private class MyMenuVisibilityListener implements OnMenuVisibilityListener {
        public void onMenuVisibilityChanged(boolean isVisible) {
            mIsMenuVisible = isVisible;
            refreshHidingMessage();
        }
    }

    private GLView mRootPane = new GLView() {

        @Override
        protected void renderBackground(GLCanvas view) {
            view.clearBuffer();
        }

        @Override
        protected void onLayout(
                boolean changed, int left, int top, int right, int bottom) {
            mPhotoView.layout(0, 0, right - left, bottom - top);
            PositionRepository.getInstance(mActivity).setOffset(0, 0);
            int filmStripHeight = 0;
            if (mFilmStripView != null) {
                mFilmStripView.measure(
                        MeasureSpec.makeMeasureSpec(right - left, MeasureSpec.EXACTLY),
                        MeasureSpec.UNSPECIFIED);
                filmStripHeight = mFilmStripView.getMeasuredHeight();
                mFilmStripView.layout(0, bottom - top - filmStripHeight,
                        right - left, bottom - top);
            }
            if (mShowDetails) {
                mDetailsHelper.layout(left, GalleryActionBar.getHeight((Activity) mActivity),
                        right, bottom);
            }
        }
    };

    private void initFilmStripView() {
        Config.PhotoPage config = Config.PhotoPage.get((Context) mActivity);
        mFilmStripView = new FilmStripView(mActivity, mMediaSet,
                config.filmstripTopMargin, config.filmstripMidMargin, config.filmstripBottomMargin,
                config.filmstripContentSize, config.filmstripThumbSize, config.filmstripBarSize,
                config.filmstripGripSize, config.filmstripGripWidth);
        mRootPane.addComponent(mFilmStripView);
        mFilmStripView.setListener(this);
        mFilmStripView.setUserInteractionListener(this);
        mFilmStripView.setFocusIndex(mCurrentIndex);
        mFilmStripView.setStartIndex(mCurrentIndex);
        mRootPane.requestLayout();
        if (mIsActive) mFilmStripView.resume();
        if (!mShowBars) mFilmStripView.setVisibility(GLView.INVISIBLE);
    }

    @Override
    public void onCreate(Bundle data, Bundle restoreState) {
        mActionBar = ((Activity) mActivity).getActionBar();
        mSelectionManager = new SelectionManager(mActivity, false);
        mMenuExecutor = new MenuExecutor(mActivity, mSelectionManager);

        mPhotoView = new PhotoView(mActivity);
        mPhotoView.setPhotoTapListener(this);
        mRootPane.addComponent(mPhotoView);
        mApplication = (GalleryApp)((Activity) mActivity).getApplication();

        String setPathString = data.getString(KEY_MEDIA_SET_PATH);
        Path itemPath = Path.fromString(data.getString(KEY_MEDIA_ITEM_PATH));

        if (setPathString != null) {
            mMediaSet = mActivity.getDataManager().getMediaSet(setPathString);
            mCurrentIndex = data.getInt(KEY_INDEX_HINT, 0);
            mMediaSet = (MediaSet)
                    mActivity.getDataManager().getMediaObject(setPathString);
            if (mMediaSet == null) {
                Log.w(TAG, "failed to restore " + setPathString);
            }
            PhotoDataAdapter pda = new PhotoDataAdapter(
                    mActivity, mPhotoView, mMediaSet, itemPath, mCurrentIndex);
            mModel = pda;
            mPhotoView.setModel(mModel);

            mResultIntent.putExtra(KEY_INDEX_HINT, mCurrentIndex);
            setStateResult(Activity.RESULT_OK, mResultIntent);

            pda.setDataListener(new PhotoDataAdapter.DataListener() {

                @Override
                public void onPhotoChanged(int index, Path item) {
                    if (mFilmStripView != null) mFilmStripView.setFocusIndex(index);
                    mCurrentIndex = index;
                    mResultIntent.putExtra(KEY_INDEX_HINT, index);
                    if (item != null) {
                        mResultIntent.putExtra(KEY_MEDIA_ITEM_PATH, item.toString());
                        MediaItem photo = mModel.getCurrentMediaItem();
                        if (photo != null) updateCurrentPhoto(photo);
                    } else {
                        mResultIntent.removeExtra(KEY_MEDIA_ITEM_PATH);
                    }
                    setStateResult(Activity.RESULT_OK, mResultIntent);
                }

                @Override
                public void onLoadingFinished() {
                    GalleryUtils.setSpinnerVisibility((Activity) mActivity, false);
                    if (!mModel.isEmpty()) {
                        MediaItem photo = mModel.getCurrentMediaItem();
                        if (photo != null) updateCurrentPhoto(photo);
                    } else if (mIsActive) {
                        mActivity.getStateManager().finishState(PhotoPage.this);
                    }
                }

                @Override
                public void onLoadingStarted() {
                    GalleryUtils.setSpinnerVisibility((Activity) mActivity, true);
                }

                @Override
                public void onPhotoAvailable(long version, boolean fullImage) {
                    if (mFilmStripView == null) initFilmStripView();
                }
            });
        } else {
            // Get default media set by the URI
            MediaItem mediaItem = (MediaItem)
                    mActivity.getDataManager().getMediaObject(itemPath);
            mModel = new SinglePhotoDataAdapter(mActivity, mPhotoView, mediaItem);
            mPhotoView.setModel(mModel);
            updateCurrentPhoto(mediaItem);
        }
        mHandler = new SynchronizedHandler(mActivity.getGLRoot()) {
            @Override
            public void handleMessage(Message message) {
                switch (message.what) {
                    case MSG_HIDE_BARS: {
                        hideBars();
                        break;
                    }
                    default: throw new AssertionError(message.what);
                }
            }
        };

        // start the opening animation
        mPhotoView.setOpenedItem(itemPath);
    }

    private void setTitle(String title) {
        if (title == null) return;
        boolean showTitle = mActivity.getAndroidContext().getResources().getBoolean(
                R.bool.show_action_bar_title);
        if (showTitle)
            mActionBar.setTitle(title);
        else
            mActionBar.setTitle("");
    }

    private void updateCurrentPhoto(MediaItem photo) {
        if (mCurrentPhoto == photo) return;
        mCurrentPhoto = photo;
        if (mCurrentPhoto == null) return;
        updateMenuOperations();
        if (mShowDetails) {
            mDetailsHelper.reloadDetails(mModel.getCurrentIndex());
        }
        setTitle(photo.getName());
        mPhotoView.showVideoPlayIcon(photo.getMediaType()
                == MediaObject.MEDIA_TYPE_VIDEO);

        // If we have an ActionBar then we update the share intent
        if (mShareActionProvider != null) {
            Path path = photo.getPath();
            DataManager manager = mActivity.getDataManager();
            int type = manager.getMediaType(path);
            Intent intent = new Intent(Intent.ACTION_SEND);
            intent.setType(MenuExecutor.getMimeType(type));
            intent.putExtra(Intent.EXTRA_STREAM, manager.getContentUri(path));
            mShareActionProvider.setShareIntent(intent);
        }
    }

    private void updateMenuOperations() {
        if (mCurrentPhoto == null || mMenu == null) return;
        int supportedOperations = mCurrentPhoto.getSupportedOperations();
        if (!GalleryUtils.isEditorAvailable((Context) mActivity, "image/*")) {
            supportedOperations &= ~MediaObject.SUPPORT_EDIT;
        }
        MenuExecutor.updateMenuOperation(mMenu, supportedOperations);
    }

    private void showBars() {
        if (mShowBars) return;
        mShowBars = true;
        mActionBar.show();
        WindowManager.LayoutParams params = ((Activity) mActivity).getWindow().getAttributes();
        params.systemUiVisibility = View.SYSTEM_UI_FLAG_VISIBLE;
        ((Activity) mActivity).getWindow().setAttributes(params);
        if (mFilmStripView != null) {
            mFilmStripView.show();
        }
    }

    private void hideBars() {
        if (!mShowBars) return;
        mShowBars = false;
        mActionBar.hide();
        WindowManager.LayoutParams params = ((Activity) mActivity).getWindow().getAttributes();
        params.systemUiVisibility = View. SYSTEM_UI_FLAG_LOW_PROFILE;
        ((Activity) mActivity).getWindow().setAttributes(params);
        if (mFilmStripView != null) {
            mFilmStripView.hide();
        }
    }

    private void refreshHidingMessage() {
        mHandler.removeMessages(MSG_HIDE_BARS);
        if (!mIsMenuVisible && !mIsInteracting) {
            mHandler.sendEmptyMessageDelayed(MSG_HIDE_BARS, HIDE_BARS_TIMEOUT);
        }
    }

    public void onUserInteraction() {
        showBars();
        refreshHidingMessage();
    }

    public void onUserInteractionTap() {
        if (mShowBars) {
            hideBars();
            mHandler.removeMessages(MSG_HIDE_BARS);
        } else {
            showBars();
            refreshHidingMessage();
        }
    }

    public void onUserInteractionBegin() {
        showBars();
        mIsInteracting = true;
        refreshHidingMessage();
    }

    public void onUserInteractionEnd() {
        mIsInteracting = false;
        refreshHidingMessage();
    }

    @Override
    protected void onBackPressed() {
        if (mShowDetails) {
            hideDetails();
        } else {
            PositionRepository repository = PositionRepository.getInstance(mActivity);
            repository.clear();
            if (mCurrentPhoto != null) {
                Position position = new Position();
                position.x = mRootPane.getWidth() / 2;
                position.y = mRootPane.getHeight() / 2;
                position.z = -1000;
                repository.putPosition(
                        Long.valueOf(System.identityHashCode(mCurrentPhoto.getPath())),
                        position);
            }
            super.onBackPressed();
        }
    }

    @Override
    protected boolean onCreateActionBar(Menu menu) {
        MenuInflater inflater = ((Activity) mActivity).getMenuInflater();
        inflater.inflate(R.menu.photo, menu);
        menu.findItem(R.id.action_slideshow).setVisible(
                mMediaSet != null && !(mMediaSet instanceof MtpDevice));
        mShareActionProvider = GalleryActionBar.initializeShareActionProvider(menu);
        mMenu = menu;
        mShowBars = true;
        updateMenuOperations();
        return true;
    }

    @Override
    protected boolean onItemSelected(MenuItem item) {
        MediaItem current = mModel.getCurrentMediaItem();

        if (current == null) {
            // item is not ready, ignore
            return true;
        }

        int currentIndex = mModel.getCurrentIndex();
        Path path = current.getPath();

        DataManager manager = mActivity.getDataManager();
        int action = item.getItemId();
        switch (action) {
            case R.id.action_slideshow: {
                Bundle data = new Bundle();
                data.putString(SlideshowPage.KEY_SET_PATH, mMediaSet.getPath().toString());
                data.putInt(SlideshowPage.KEY_PHOTO_INDEX, currentIndex);
                data.putBoolean(SlideshowPage.KEY_REPEAT, true);
                mActivity.getStateManager().startStateForResult(
                        SlideshowPage.class, REQUEST_SLIDESHOW, data);
                return true;
            }
            case R.id.action_crop: {
                Activity activity = (Activity) mActivity;
                Intent intent = new Intent(CropImage.CROP_ACTION);
                intent.setClass(activity, CropImage.class);
                intent.setData(manager.getContentUri(path));
                activity.startActivityForResult(intent, PicasaSource.isPicasaImage(current)
                        ? REQUEST_CROP_PICASA
                        : REQUEST_CROP);
                return true;
            }
            case R.id.action_details: {
                if (mShowDetails) {
                    hideDetails();
                } else {
                    showDetails(currentIndex);
                }
                return true;
            }
            case R.id.action_setas:
            case R.id.action_confirm_delete:
            case R.id.action_rotate_ccw:
            case R.id.action_rotate_cw:
            case R.id.action_show_on_map:
            case R.id.action_edit:
                mSelectionManager.deSelectAll();
                mSelectionManager.toggle(path);
                mMenuExecutor.onMenuClicked(item, null);
                return true;
            case R.id.action_import:
                mSelectionManager.deSelectAll();
                mSelectionManager.toggle(path);
                mMenuExecutor.onMenuClicked(item,
                        new ImportCompleteListener(mActivity));
                return true;
            default :
                return false;
        }
    }

    private void hideDetails() {
        mShowDetails = false;
        mDetailsHelper.hide();
    }

    private void showDetails(int index) {
        mShowDetails = true;
        if (mDetailsHelper == null) {
            mDetailsHelper = new DetailsHelper(mActivity, mRootPane, new MyDetailsSource());
            mDetailsHelper.setCloseListener(new CloseListener() {
                public void onClose() {
                    hideDetails();
                }
            });
        }
        mDetailsHelper.reloadDetails(index);
        mDetailsHelper.show();
    }

    public void onSingleTapUp(int x, int y) {
        MediaItem item = mModel.getCurrentMediaItem();
        if (item == null) {
            // item is not ready, ignore
            return;
        }

        boolean playVideo =
                (item.getSupportedOperations() & MediaItem.SUPPORT_PLAY) != 0;

        if (playVideo) {
            // determine if the point is at center (1/6) of the photo view.
            // (The position of the "play" icon is at center (1/6) of the photo)
            int w = mPhotoView.getWidth();
            int h = mPhotoView.getHeight();
            playVideo = (Math.abs(x - w / 2) * 12 <= w)
                && (Math.abs(y - h / 2) * 12 <= h);
        }

        if (playVideo) {
            playVideo((Activity) mActivity, item.getPlayUri(), item.getName());
        } else {
            onUserInteractionTap();
        }
    }

    public static void playVideo(Activity activity, Uri uri, String title) {
        try {
            Intent intent = new Intent(Intent.ACTION_VIEW)
                    .setDataAndType(uri, "video/*");
            intent.putExtra(Intent.EXTRA_TITLE, title);
            activity.startActivity(intent);
        } catch (ActivityNotFoundException e) {
            Toast.makeText(activity, activity.getString(R.string.video_err),
                    Toast.LENGTH_SHORT).show();
        }
    }

    // Called by FileStripView
    public void onSlotSelected(int slotIndex) {
        ((PhotoDataAdapter) mModel).jumpTo(slotIndex);
    }

    @Override
    protected void onStateResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
            case REQUEST_CROP:
                if (resultCode == Activity.RESULT_OK) {
                    if (data == null) break;
                    Path path = mApplication
                            .getDataManager().findPathByUri(data.getData());
                    if (path != null) {
                        mModel.setCurrentPhoto(path, mCurrentIndex);
                    }
                }
                break;
            case REQUEST_CROP_PICASA: {
                int message = resultCode == Activity.RESULT_OK
                        ? R.string.crop_saved
                        : R.string.crop_not_saved;
                Toast.makeText(mActivity.getAndroidContext(),
                        message, Toast.LENGTH_SHORT).show();
                break;
            }
            case REQUEST_SLIDESHOW: {
                if (data == null) break;
                String path = data.getStringExtra(SlideshowPage.KEY_ITEM_PATH);
                int index = data.getIntExtra(SlideshowPage.KEY_PHOTO_INDEX, 0);
                if (path != null) {
                    mModel.setCurrentPhoto(Path.fromString(path), index);
                }
            }
        }
    }

    @Override
    public void onPause() {
        super.onPause();
        mIsActive = false;
        if (mFilmStripView != null) {
            mFilmStripView.pause();
        }
        DetailsHelper.pause();
        mPhotoView.pause();
        mModel.pause();
        mHandler.removeMessages(MSG_HIDE_BARS);
        mActionBar.removeOnMenuVisibilityListener(mMenuVisibilityListener);
        mMenuExecutor.pause();
    }

    @Override
    protected void onResume() {
        super.onResume();
        mIsActive = true;
        setContentPane(mRootPane);
        mModel.resume();
        mPhotoView.resume();
        if (mFilmStripView != null) {
            mFilmStripView.resume();
        }
        if (mMenuVisibilityListener == null) {
            mMenuVisibilityListener = new MyMenuVisibilityListener();
        }
        mActionBar.addOnMenuVisibilityListener(mMenuVisibilityListener);
        onUserInteraction();
    }

    private class MyDetailsSource implements DetailsSource {
        private int mIndex;

        @Override
        public MediaDetails getDetails() {
            return mModel.getCurrentMediaItem().getDetails();
        }

        @Override
        public int size() {
            return mMediaSet != null ? mMediaSet.getMediaItemCount() : 1;
        }

        @Override
        public int findIndex(int indexHint) {
            mIndex = indexHint;
            return indexHint;
        }

        @Override
        public int getIndex() {
            return mIndex;
        }
    }
}