/*
 * 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 android.support.v7.widget;

import static android.support.annotation.RestrictTo.Scope.LIBRARY_GROUP;

import android.content.Context;
import android.content.res.ColorStateList;
import android.graphics.PorterDuff;
import android.graphics.drawable.Drawable;
import android.support.annotation.DrawableRes;
import android.support.annotation.Nullable;
import android.support.annotation.RequiresApi;
import android.support.annotation.RestrictTo;
import android.support.v4.view.TintableBackgroundView;
import android.support.v7.appcompat.R;
import android.util.AttributeSet;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityNodeInfo;
import android.widget.Button;

/**
 * A {@link Button} which supports compatible features on older version of the platform,
 * including:
 * <ul>
 *     <li>Supports {@link R.attr#textAllCaps} style attribute which works back to
 *     {@link android.os.Build.VERSION_CODES#GINGERBREAD Gingerbread}.</li>
 *     <li>Allows dynamic tint of its background via the background tint methods in
 *     {@link android.support.v4.view.ViewCompat}.</li>
 *     <li>Allows setting of the background tint using {@link R.attr#backgroundTint} and
 *     {@link R.attr#backgroundTintMode}.</li>
 * </ul>
 *
 * <p>This will automatically be used when you use {@link android.widget.Button} in your
 * layouts. You should only need to manually use this class when writing custom views.</p>
 */
public class AppCompatButton extends Button implements TintableBackgroundView {

    private final AppCompatBackgroundHelper mBackgroundTintHelper;
    private final AppCompatTextHelper mTextHelper;

    public AppCompatButton(Context context) {
        this(context, null);
    }

    public AppCompatButton(Context context, AttributeSet attrs) {
        this(context, attrs, R.attr.buttonStyle);
    }

    public AppCompatButton(Context context, AttributeSet attrs, int defStyleAttr) {
        super(TintContextWrapper.wrap(context), attrs, defStyleAttr);

        mBackgroundTintHelper = new AppCompatBackgroundHelper(this);
        mBackgroundTintHelper.loadFromAttributes(attrs, defStyleAttr);

        mTextHelper = AppCompatTextHelper.create(this);
        mTextHelper.loadFromAttributes(attrs, defStyleAttr);
        mTextHelper.applyCompoundDrawablesTints();
    }

    @Override
    public void setBackgroundResource(@DrawableRes int resId) {
        super.setBackgroundResource(resId);
        if (mBackgroundTintHelper != null) {
            mBackgroundTintHelper.onSetBackgroundResource(resId);
        }
    }

    @Override
    public void setBackgroundDrawable(Drawable background) {
        super.setBackgroundDrawable(background);
        if (mBackgroundTintHelper != null) {
            mBackgroundTintHelper.onSetBackgroundDrawable(background);
        }
    }

    /**
     * This should be accessed via
     * {@link android.support.v4.view.ViewCompat#setBackgroundTintList(android.view.View, ColorStateList)}
     *
     * @hide
     */
    @RestrictTo(LIBRARY_GROUP)
    @Override
    public void setSupportBackgroundTintList(@Nullable ColorStateList tint) {
        if (mBackgroundTintHelper != null) {
            mBackgroundTintHelper.setSupportBackgroundTintList(tint);
        }
    }

    /**
     * This should be accessed via
     * {@link android.support.v4.view.ViewCompat#getBackgroundTintList(android.view.View)}
     *
     * @hide
     */
    @RestrictTo(LIBRARY_GROUP)
    @Override
    @Nullable
    public ColorStateList getSupportBackgroundTintList() {
        return mBackgroundTintHelper != null
                ? mBackgroundTintHelper.getSupportBackgroundTintList() : null;
    }

    /**
     * This should be accessed via
     * {@link android.support.v4.view.ViewCompat#setBackgroundTintMode(android.view.View, PorterDuff.Mode)}
     *
     * @hide
     */
    @RestrictTo(LIBRARY_GROUP)
    @Override
    public void setSupportBackgroundTintMode(@Nullable PorterDuff.Mode tintMode) {
        if (mBackgroundTintHelper != null) {
            mBackgroundTintHelper.setSupportBackgroundTintMode(tintMode);
        }
    }

    /**
     * This should be accessed via
     * {@link android.support.v4.view.ViewCompat#getBackgroundTintMode(android.view.View)}
     *
     * @hide
     */
    @RestrictTo(LIBRARY_GROUP)
    @Override
    @Nullable
    public PorterDuff.Mode getSupportBackgroundTintMode() {
        return mBackgroundTintHelper != null
                ? mBackgroundTintHelper.getSupportBackgroundTintMode() : null;
    }

    @Override
    protected void drawableStateChanged() {
        super.drawableStateChanged();
        if (mBackgroundTintHelper != null) {
            mBackgroundTintHelper.applySupportBackgroundTint();
        }
        if (mTextHelper != null) {
            mTextHelper.applyCompoundDrawablesTints();
        }
    }

    @Override
    public void setTextAppearance(Context context, int resId) {
        super.setTextAppearance(context, resId);
        if (mTextHelper != null) {
            mTextHelper.onSetTextAppearance(context, resId);
        }
    }

    @Override
    public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
        super.onInitializeAccessibilityEvent(event);
        event.setClassName(Button.class.getName());
    }

    @RequiresApi(14)
    @Override
    public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
        super.onInitializeAccessibilityNodeInfo(info);
        info.setClassName(Button.class.getName());
    }

    /**
     * Sets the properties of this field to transform input to ALL CAPS
     * display. This may use a "small caps" formatting if available.
     * This setting will be ignored if this field is editable or selectable.
     *
     * This call replaces the current transformation method. Disabling this
     * will not necessarily restore the previous behavior from before this
     * was enabled.
     */
    public void setSupportAllCaps(boolean allCaps) {
        if (mTextHelper != null) {
            mTextHelper.setAllCaps(allCaps);
        }
    }
}