/*
 * Copyright (C) 2009 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.contacts.editor;

import com.android.contacts.ContactsUtils;
import com.android.contacts.R;
import com.android.contacts.model.DataKind;
import com.android.contacts.model.EntityDelta;
import com.android.contacts.model.EntityDelta.ValuesDelta;
import com.android.contacts.util.ContactPhotoUtils;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.provider.ContactsContract.CommonDataKinds.Photo;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;

/**
 * Simple editor for {@link Photo}.
 */
public class PhotoEditorView extends LinearLayout implements Editor {

    private ImageView mPhotoImageView;
    private View mFrameView;

    private ValuesDelta mEntry;
    private EditorListener mListener;
    private View mTriangleAffordance;

    private boolean mHasSetPhoto = false;
    private boolean mReadOnly;

    public PhotoEditorView(Context context) {
        super(context);
    }

    public PhotoEditorView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public void setEnabled(boolean enabled) {
        super.setEnabled(enabled);
        mFrameView.setEnabled(enabled);
    }

    @Override
    public void editNewlyAddedField() {
        // Never called, since the user never adds a new photo-editor;
        // you can only change the picture in an existing editor.
    }

    /** {@inheritDoc} */
    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        mTriangleAffordance = findViewById(R.id.photo_triangle_affordance);
        mPhotoImageView = (ImageView) findViewById(R.id.photo);
        mFrameView = findViewById(R.id.frame);
        mFrameView.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mListener != null) {
                    mListener.onRequest(EditorListener.REQUEST_PICK_PHOTO);
                }
            }
        });
    }

    /** {@inheritDoc} */
    @Override
    public void onFieldChanged(String column, String value) {
        throw new UnsupportedOperationException("Photos don't support direct field changes");
    }

    /** {@inheritDoc} */
    @Override
    public void setValues(DataKind kind, ValuesDelta values, EntityDelta state, boolean readOnly,
            ViewIdGenerator vig) {
        mEntry = values;
        mReadOnly = readOnly;

        setId(vig.getId(state, kind, values, 0));

        if (values != null) {
            // Try decoding photo if actual entry
            final byte[] photoBytes = values.getAsByteArray(Photo.PHOTO);
            if (photoBytes != null) {
                final Bitmap photo = BitmapFactory.decodeByteArray(photoBytes, 0,
                        photoBytes.length);

                mPhotoImageView.setImageBitmap(photo);
                mFrameView.setEnabled(isEnabled());
                mHasSetPhoto = true;
                mEntry.setFromTemplate(false);
            } else {
                resetDefault();
            }
        } else {
            resetDefault();
        }
    }

    /**
     * Return true if a valid {@link Photo} has been set.
     */
    public boolean hasSetPhoto() {
        return mHasSetPhoto;
    }

    /**
     * Assign the given {@link Bitmap} as the new value, updating UI and
     * readying for persisting through {@link ValuesDelta}.
     */
    public void setPhotoBitmap(Bitmap photo) {
        if (photo == null) {
            // Clear any existing photo and return
            mEntry.put(Photo.PHOTO, (byte[])null);
            resetDefault();
            return;
        }

        mPhotoImageView.setImageBitmap(photo);
        mFrameView.setEnabled(isEnabled());
        mHasSetPhoto = true;
        mEntry.setFromTemplate(false);

        // When the user chooses a new photo mark it as super primary
        mEntry.put(Photo.IS_SUPER_PRIMARY, 1);

        // Even though high-res photos cannot be saved by passing them via
        // an EntityDeltaList (since they cause the Bundle size limit to be
        // exceeded), we still pass a low-res thumbnail. This simplifies
        // code all over the place, because we don't have to test whether
        // there is a change in EITHER the delta-list OR a changed photo...
        // this way, there is always a change in the delta-list.
        final int size = ContactsUtils.getThumbnailSize(getContext());
        final Bitmap scaled = Bitmap.createScaledBitmap(photo, size, size, false);
        final byte[] compressed = ContactPhotoUtils.compressBitmap(scaled);
        if (compressed != null) mEntry.put(Photo.PHOTO, compressed);
    }

    /**
     * Set the super primary bit on the photo.
     */
    public void setSuperPrimary(boolean superPrimary) {
        mEntry.put(Photo.IS_SUPER_PRIMARY, superPrimary ? 1 : 0);
    }

    protected void resetDefault() {
        // Invalid photo, show default "add photo" place-holder
        mPhotoImageView.setImageResource(R.drawable.ic_contact_picture_holo_light);
        mFrameView.setEnabled(!mReadOnly && isEnabled());
        mHasSetPhoto = false;
        mEntry.setFromTemplate(true);
    }

    /** {@inheritDoc} */
    @Override
    public void setEditorListener(EditorListener listener) {
        mListener = listener;

        final boolean isPushable = listener != null;
        mTriangleAffordance.setVisibility(isPushable ? View.VISIBLE : View.INVISIBLE);
        mFrameView.setVisibility(isPushable ? View.VISIBLE : View.INVISIBLE);
    }

    @Override
    public void setDeletable(boolean deletable) {
        // Photo is not deletable
    }

    @Override
    public boolean isEmpty() {
        return !mHasSetPhoto;
    }

    @Override
    public void deleteEditor() {
        // Photo is not deletable
    }

    @Override
    public void clearAllFields() {
        resetDefault();
    }
}