/*
 * Copyright (C) 2014 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.inputmethod.keyboard.internal;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.Gravity;
import android.widget.TextView;

import com.android.inputmethod.keyboard.Key;
import com.android.inputmethod.latin.R;

/**
 * The pop up key preview view.
 */
public class KeyPreviewView extends TextView {
    public static final int POSITION_MIDDLE = 0;
    public static final int POSITION_LEFT = 1;
    public static final int POSITION_RIGHT = 2;

    public KeyPreviewView(final Context context, final AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public KeyPreviewView(final Context context, final AttributeSet attrs, final int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        setGravity(Gravity.CENTER);
    }

    public void setPreviewVisual(final Key key, final KeyboardIconsSet iconsSet,
            final KeyDrawParams drawParams) {
        // What we show as preview should match what we show on a key top in onDraw().
        final int iconId = key.getIconId();
        if (iconId != KeyboardIconsSet.ICON_UNDEFINED) {
            setCompoundDrawables(null, null, null, key.getPreviewIcon(iconsSet));
            setText(null);
            return;
        }

        setCompoundDrawables(null, null, null, null);
        setTextColor(drawParams.mPreviewTextColor);
        setTextSize(TypedValue.COMPLEX_UNIT_PX, key.selectPreviewTextSize(drawParams));
        setTypeface(key.selectPreviewTypeface(drawParams));
        // TODO Should take care of temporaryShiftLabel here.
        setText(key.getPreviewLabel());
    }

    // Background state set
    private static final int[][][] KEY_PREVIEW_BACKGROUND_STATE_TABLE = {
        { // POSITION_MIDDLE
            {},
            { R.attr.state_has_morekeys }
        },
        { // POSITION_LEFT
            { R.attr.state_left_edge },
            { R.attr.state_left_edge, R.attr.state_has_morekeys }
        },
        { // POSITION_RIGHT
            { R.attr.state_right_edge },
            { R.attr.state_right_edge, R.attr.state_has_morekeys }
        }
    };
    private static final int STATE_NORMAL = 0;
    private static final int STATE_HAS_MOREKEYS = 1;

    public void setPreviewBackground(final boolean hasMoreKeys, final int position) {
        final Drawable background = getBackground();
        if (background == null) {
            return;
        }
        final int hasMoreKeysState = hasMoreKeys ? STATE_HAS_MOREKEYS : STATE_NORMAL;
        background.setState(KEY_PREVIEW_BACKGROUND_STATE_TABLE[position][hasMoreKeysState]);
    }
}