/*
 * Copyright (C) 2015 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.setupwizardlib;

import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Shader.TileMode;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.LayerDrawable;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.util.Log;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewStub;
import android.view.ViewTreeObserver;
import android.widget.FrameLayout;
import android.widget.TextView;

import com.android.setupwizardlib.annotations.Keep;
import com.android.setupwizardlib.util.RequireScrollHelper;
import com.android.setupwizardlib.view.BottomScrollView;
import com.android.setupwizardlib.view.Illustration;
import com.android.setupwizardlib.view.NavigationBar;

public class SetupWizardLayout extends FrameLayout {

    private static final String TAG = "SetupWizardLayout";

    /**
     * The container of the actual content. This will be a view in the template, which child views
     * will be added to when {@link #addView(android.view.View)} is called. This will be the layout
     * in the template that has the ID of {@link #getContainerId()}. For the default implementation
     * of SetupWizardLayout, that would be @id/suw_layout_content.
     */
    private ViewGroup mContainer;

    public SetupWizardLayout(Context context) {
        super(context);
        init(0, null, R.attr.suwLayoutTheme);
    }

    public SetupWizardLayout(Context context, int template) {
        super(context);
        init(template, null, R.attr.suwLayoutTheme);
    }

    public SetupWizardLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(0, attrs, R.attr.suwLayoutTheme);
    }

    @TargetApi(VERSION_CODES.HONEYCOMB)
    public SetupWizardLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(0, attrs, defStyleAttr);
    }

    @TargetApi(VERSION_CODES.HONEYCOMB)
    public SetupWizardLayout(Context context, int template, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(template, attrs, defStyleAttr);
    }

    // All the constructors delegate to this init method. The 3-argument constructor is not
    // available in LinearLayout before v11, so call super with the exact same arguments.
    private void init(int template, AttributeSet attrs, int defStyleAttr) {
        final TypedArray a = getContext().obtainStyledAttributes(attrs,
                R.styleable.SuwSetupWizardLayout, defStyleAttr, 0);
        if (template == 0) {
            template = a.getResourceId(R.styleable.SuwSetupWizardLayout_android_layout, 0);
        }
        inflateTemplate(template);

        // Set the background from XML, either directly or built from a bitmap tile
        final Drawable background =
                a.getDrawable(R.styleable.SuwSetupWizardLayout_suwBackground);
        if (background != null) {
            setLayoutBackground(background);
        } else {
            final Drawable backgroundTile =
                    a.getDrawable(R.styleable.SuwSetupWizardLayout_suwBackgroundTile);
            if (backgroundTile != null) {
                setBackgroundTile(backgroundTile);
            }
        }

        // Set the illustration from XML, either directly or built from image + horizontal tile
        final Drawable illustration =
                a.getDrawable(R.styleable.SuwSetupWizardLayout_suwIllustration);
        if (illustration != null) {
            setIllustration(illustration);
        } else {
            final Drawable illustrationImage =
                    a.getDrawable(R.styleable.SuwSetupWizardLayout_suwIllustrationImage);
            final Drawable horizontalTile = a.getDrawable(
                    R.styleable.SuwSetupWizardLayout_suwIllustrationHorizontalTile);
            if (illustrationImage != null && horizontalTile != null) {
                setIllustration(illustrationImage, horizontalTile);
            }
        }

        // Set the top padding of the illustration
        int decorPaddingTop = a.getDimensionPixelSize(
                R.styleable.SuwSetupWizardLayout_suwDecorPaddingTop, -1);
        if (decorPaddingTop == -1) {
            decorPaddingTop = getResources().getDimensionPixelSize(R.dimen.suw_decor_padding_top);
        }
        setDecorPaddingTop(decorPaddingTop);


        // Set the illustration aspect ratio. See Illustration.setAspectRatio(float). This will
        // override suwIllustrationPaddingTop if its value is not 0.
        float illustrationAspectRatio = a.getFloat(
                R.styleable.SuwSetupWizardLayout_suwIllustrationAspectRatio, -1f);
        if (illustrationAspectRatio == -1f) {
            final TypedValue out = new TypedValue();
            getResources().getValue(R.dimen.suw_illustration_aspect_ratio, out, true);
            illustrationAspectRatio = out.getFloat();
        }
        setIllustrationAspectRatio(illustrationAspectRatio);

        // Set the header text
        final CharSequence headerText =
                a.getText(R.styleable.SuwSetupWizardLayout_suwHeaderText);
        if (headerText != null) {
            setHeaderText(headerText);
        }

        a.recycle();
    }

    @Override
    protected Parcelable onSaveInstanceState() {
        final Parcelable parcelable = super.onSaveInstanceState();
        final SavedState ss = new SavedState(parcelable);
        ss.isProgressBarShown = isProgressBarShown();
        return ss;
    }

    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        final SavedState ss = (SavedState) state;
        super.onRestoreInstanceState(ss.getSuperState());
        final boolean isProgressBarShown = ss.isProgressBarShown;
        if (isProgressBarShown) {
            showProgressBar();
        } else {
            hideProgressBar();
        }
    }

    @Override
    public void addView(View child, int index, ViewGroup.LayoutParams params) {
        mContainer.addView(child, index, params);
    }

    private void addViewInternal(View child) {
        super.addView(child, -1, generateDefaultLayoutParams());
    }

    private void inflateTemplate(int templateResource) {
        final LayoutInflater inflater = LayoutInflater.from(getContext());
        final View templateRoot = onInflateTemplate(inflater, templateResource);
        addViewInternal(templateRoot);

        mContainer = (ViewGroup) findViewById(getContainerId());
        onTemplateInflated();
    }

    /**
     * This method inflates the template. Subclasses can override this method to customize the
     * template inflation, or change to a different default template. The root of the inflated
     * layout should be returned, and not added to the view hierarchy.
     *
     * @param inflater A LayoutInflater to inflate the template.
     * @param template The resource ID of the template to be inflated, or 0 if no template is
     *                 specified.
     * @return Root of the inflated layout.
     */
    protected View onInflateTemplate(LayoutInflater inflater, int template) {
        if (template == 0) {
            template = R.layout.suw_template;
        }
        return inflater.inflate(template, this, false);
    }

    /**
     * This is called after the template has been inflated and added to the view hierarchy.
     * Subclasses can implement this method to modify the template as necessary, such as caching
     * views retrieved from findViewById, or other view operations that need to be done in code.
     * You can think of this as {@link android.view.View#onFinishInflate()} but for inflation of the
     * template instead of for child views.
     */
    protected void onTemplateInflated() {
    }

    protected int getContainerId() {
        return R.id.suw_layout_content;
    }

    public NavigationBar getNavigationBar() {
        final View view = findViewById(R.id.suw_layout_navigation_bar);
        return view instanceof NavigationBar ? (NavigationBar) view : null;
    }

    private BottomScrollView getScrollView() {
        final View view = findViewById(R.id.suw_bottom_scroll_view);
        return view instanceof BottomScrollView ? (BottomScrollView) view : null;
    }

    public void requireScrollToBottom() {
        final NavigationBar navigationBar = getNavigationBar();
        final BottomScrollView scrollView = getScrollView();
        if (navigationBar != null && scrollView != null) {
            RequireScrollHelper.requireScroll(navigationBar, scrollView);
        } else {
            Log.e(TAG, "Both suw_layout_navigation_bar and suw_bottom_scroll_view must exist in"
                    + " the template to require scrolling.");
        }
    }

    public void setHeaderText(int title) {
        final TextView titleView = (TextView) findViewById(R.id.suw_layout_title);
        if (titleView != null) {
            titleView.setText(title);
        }
    }

    public void setHeaderText(CharSequence title) {
        final TextView titleView = (TextView) findViewById(R.id.suw_layout_title);
        if (titleView != null) {
            titleView.setText(title);
        }
    }

    public CharSequence getHeaderText() {
        final TextView titleView = (TextView) findViewById(R.id.suw_layout_title);
        return titleView != null ? titleView.getText() : null;
    }

    /**
     * Set the illustration of the layout. The drawable will be applied as is, and the bounds will
     * be set as implemented in {@link com.android.setupwizardlib.view.Illustration}. To create
     * a suitable drawable from an asset and a horizontal repeating tile, use
     * {@link #setIllustration(int, int)} instead.
     *
     * @param drawable The drawable specifying the illustration.
     */
    public void setIllustration(Drawable drawable) {
        final View view = findViewById(R.id.suw_layout_decor);
        if (view instanceof Illustration) {
            final Illustration illustration = (Illustration) view;
            illustration.setIllustration(drawable);
        }
    }

    /**
     * Set the illustration of the layout, which will be created asset and the horizontal tile as
     * suitable. On phone layouts (not sw600dp), the asset will be scaled, maintaining aspect ratio.
     * On tablets (sw600dp), the assets will always have 256dp height and the rest of the
     * illustration area that the asset doesn't fill will be covered by the horizontalTile.
     *
     * @param asset Resource ID of the illustration asset.
     * @param horizontalTile Resource ID of the horizontally repeating tile for tablet layout.
     */
    public void setIllustration(int asset, int horizontalTile) {
        final View view = findViewById(R.id.suw_layout_decor);
        if (view instanceof Illustration) {
            final Illustration illustration = (Illustration) view;
            final Drawable illustrationDrawable = getIllustration(asset, horizontalTile);
            illustration.setIllustration(illustrationDrawable);
        }
    }

    private void setIllustration(Drawable asset, Drawable horizontalTile) {
        final View view = findViewById(R.id.suw_layout_decor);
        if (view instanceof Illustration) {
            final Illustration illustration = (Illustration) view;
            final Drawable illustrationDrawable = getIllustration(asset, horizontalTile);
            illustration.setIllustration(illustrationDrawable);
        }
    }

    /**
     * Sets the aspect ratio of the illustration. This will be the space (padding top) reserved
     * above the header text. This will override the padding top of the illustration.
     *
     * @param aspectRatio The aspect ratio
     * @see com.android.setupwizardlib.view.Illustration#setAspectRatio(float)
     */
    public void setIllustrationAspectRatio(float aspectRatio) {
        final View view = findViewById(R.id.suw_layout_decor);
        if (view instanceof Illustration) {
            final Illustration illustration = (Illustration) view;
            illustration.setAspectRatio(aspectRatio);
        }
    }

    /**
     * Set the top padding of the decor view. If the decor is an Illustration and the aspect ratio
     * is set, this value will be overridden.
     *
     * Note: Currently the default top padding for tablet landscape is 128dp, which is the offset
     * of the card from the top. This is likely to change in future versions so this value aligns
     * with the height of the illustration instead.
     *
     * @param paddingTop The top padding in pixels.
     */
    public void setDecorPaddingTop(int paddingTop) {
        final View view = findViewById(R.id.suw_layout_decor);
        if (view != null) {
            view.setPadding(view.getPaddingLeft(), paddingTop, view.getPaddingRight(),
                    view.getPaddingBottom());
        }
    }

    /**
     * Set the background of the layout, which is expected to be able to extend infinitely. If it is
     * a bitmap tile and you want it to repeat, use {@link #setBackgroundTile(int)} instead.
     */
    public void setLayoutBackground(Drawable background) {
        final View view = findViewById(R.id.suw_layout_decor);
        if (view != null) {
            //noinspection deprecation
            view.setBackgroundDrawable(background);
        }
    }

    /**
     * Set the background of the layout to a repeating bitmap tile. To use a different kind of
     * drawable, use {@link #setLayoutBackground(android.graphics.drawable.Drawable)} instead.
     */
    public void setBackgroundTile(int backgroundTile) {
        final Drawable backgroundTileDrawable =
                getContext().getResources().getDrawable(backgroundTile);
        setBackgroundTile(backgroundTileDrawable);
    }

    private void setBackgroundTile(Drawable backgroundTile) {
        if (backgroundTile instanceof BitmapDrawable) {
            ((BitmapDrawable) backgroundTile).setTileModeXY(TileMode.REPEAT, TileMode.REPEAT);
        }
        setLayoutBackground(backgroundTile);
    }

    private Drawable getIllustration(int asset, int horizontalTile) {
        final Context context = getContext();
        final Drawable assetDrawable = context.getResources().getDrawable(asset);
        final Drawable tile = context.getResources().getDrawable(horizontalTile);
        return getIllustration(assetDrawable, tile);
    }

    @SuppressLint("RtlHardcoded")
    private Drawable getIllustration(Drawable asset, Drawable horizontalTile) {
        final Context context = getContext();
        if (context.getResources().getBoolean(R.bool.suwUseTabletLayout)) {
            // If it is a "tablet" (sw600dp), create a LayerDrawable with the horizontal tile.
            if (horizontalTile instanceof BitmapDrawable) {
                ((BitmapDrawable) horizontalTile).setTileModeX(TileMode.REPEAT);
                ((BitmapDrawable) horizontalTile).setGravity(Gravity.TOP);
            }
            if (asset instanceof BitmapDrawable) {
                // Always specify TOP | LEFT, Illustration will flip the entire LayerDrawable.
                ((BitmapDrawable) asset).setGravity(Gravity.TOP | Gravity.LEFT);
            }
            final LayerDrawable layers =
                    new LayerDrawable(new Drawable[] { horizontalTile, asset });
            if (VERSION.SDK_INT >= VERSION_CODES.KITKAT) {
                layers.setAutoMirrored(true);
            }
            return layers;
        } else {
            // If it is a "phone" (not sw600dp), simply return the illustration
            if (VERSION.SDK_INT >= VERSION_CODES.KITKAT) {
                asset.setAutoMirrored(true);
            }
            return asset;
        }
    }

    public boolean isProgressBarShown() {
        final View progressBar = findViewById(R.id.suw_layout_progress);
        return progressBar != null && progressBar.getVisibility() == View.VISIBLE;
    }

    public void showProgressBar() {
        final View progressBar = findViewById(R.id.suw_layout_progress);
        if (progressBar != null) {
            progressBar.setVisibility(View.VISIBLE);
        } else {
            final ViewStub progressBarStub = (ViewStub) findViewById(R.id.suw_layout_progress_stub);
            if (progressBarStub != null) {
                progressBarStub.inflate();
            }
        }
    }

    public void hideProgressBar() {
        final View progressBar = findViewById(R.id.suw_layout_progress);
        if (progressBar != null) {
            progressBar.setVisibility(View.GONE);
        }
    }

    /* Animator support */

    private float mXFraction;
    private ViewTreeObserver.OnPreDrawListener mPreDrawListener;

    /**
     * Set the X translation as a fraction of the width of this view. Make sure this method is not
     * stripped out by proguard when using ObjectAnimator. You may need to add
     *     -keep @com.android.setupwizardlib.annotations.Keep class *
     * to your proguard configuration if you are seeing mysterious MethodNotFoundExceptions at
     * runtime.
     */
    @Keep
    public void setXFraction(float fraction) {
        mXFraction = fraction;
        final int width = getWidth();
        if (width != 0) {
            setTranslationX(width * fraction);
        } else {
            // If we haven't done a layout pass yet, wait for one and then set the fraction before
            // the draw occurs using an OnPreDrawListener. Don't call translationX until we know
            // getWidth() has a reliable, non-zero value or else we will see the fragment flicker on
            // screen.
            if (mPreDrawListener == null) {
                mPreDrawListener = new ViewTreeObserver.OnPreDrawListener() {
                    @Override
                    public boolean onPreDraw() {
                        getViewTreeObserver().removeOnPreDrawListener(mPreDrawListener);
                        setXFraction(mXFraction);
                        return true;
                    }
                };
                getViewTreeObserver().addOnPreDrawListener(mPreDrawListener);
            }
        }
    }

    /**
     * Return the X translation as a fraction of the width, as previously set in setXFraction.
     *
     * @see #setXFraction(float)
     */
    @Keep
    public float getXFraction() {
        return mXFraction;
    }

    /* Misc */

    protected static class SavedState extends BaseSavedState {

        boolean isProgressBarShown = false;

        public SavedState(Parcelable parcelable) {
            super(parcelable);
        }

        public SavedState(Parcel source) {
            super(source);
            isProgressBarShown = source.readInt() != 0;
        }

        @Override
        public void writeToParcel(Parcel dest, int flags) {
            super.writeToParcel(dest, flags);
            dest.writeInt(isProgressBarShown ? 1 : 0);
        }

        public static final Parcelable.Creator<SavedState> CREATOR =
                new Parcelable.Creator<SavedState>() {

                    @Override
                    public SavedState createFromParcel(Parcel parcel) {
                        return new SavedState(parcel);
                    }

                    @Override
                    public SavedState[] newArray(int size) {
                        return new SavedState[size];
                    }
                };
    }
}