/*
 * Copyright (C) 2011 The Android Open Source Project
 * Copyright (C) 2011 Jake Wharton
 *
 * 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.viewpagerindicator;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import androidx.viewpager.widget.PagerAdapter;
import androidx.viewpager.widget.ViewPager;
import androidx.viewpager.widget.ViewPager.OnPageChangeListener;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.wpc.library.util.common.DimenUtils;
import com.wpc.library.util.common.StringUtils;
import com.viewpagerindicator.util.DownLoadFile;

import java.io.File;
import java.util.List;

import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;

/**
 * This widget implements the dynamic action bar tab behavior that can change
 * across different configurations or circumstances.
 */
public class TabPageIndicator extends HorizontalScrollView implements PageIndicator {
    /**
     * Title text used when no title is provided by the adapter.
     */
    private static final CharSequence EMPTY_TITLE = "";

    private List<ImagePath> imgList;

    /**
     * Interface for a callback when the selected tab has been reselected.
     */
    public interface OnTabReselectedListener {
        /**
         * Callback when the selected tab has been reselected.
         *
         * @param position Position of the current center item.
         */
        void onTabReselected(int position);
    }

    private Runnable mTabSelector;

    private final OnClickListener mTabClickListener = new OnClickListener() {
        public void onClick(View view) {
            TabView tabView = (TabView) view;
            final int oldSelected = mViewPager.getCurrentItem();
            final int newSelected = tabView.getIndex();
            mViewPager.setCurrentItem(newSelected);
            if (oldSelected == newSelected && mTabReselectedListener != null) {
                mTabReselectedListener.onTabReselected(newSelected);
            }
        }
    };

    private final IcsLinearLayout mTabLayout;

    private ViewPager mViewPager;
    private OnPageChangeListener mListener;

    private int mMaxTabWidth;
    private int mSelectedTabIndex;

    private OnTabReselectedListener mTabReselectedListener;

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

    public TabPageIndicator(Context context, AttributeSet attrs) {
        super(context, attrs);
        setHorizontalScrollBarEnabled(false);
        setBackgroundColor(getResources().getColor(R.color.white));
        mTabLayout = new IcsLinearLayout(context, R.attr.vpiTabPageIndicatorStyle);
        addView(mTabLayout, new ViewGroup.LayoutParams(WRAP_CONTENT, MATCH_PARENT));
    }

    public void setOnTabReselectedListener(OnTabReselectedListener listener) {
        mTabReselectedListener = listener;
    }

    @Override
    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
        final boolean lockedExpanded = widthMode == MeasureSpec.EXACTLY;
        setFillViewport(lockedExpanded);

        final int childCount = mTabLayout.getChildCount();
        if (childCount > 1 && (widthMode == MeasureSpec.EXACTLY || widthMode == MeasureSpec.AT_MOST)) {
            if (childCount > 2) {
                mMaxTabWidth = (int) (MeasureSpec.getSize(widthMeasureSpec) * 0.4f);
            } else {
                mMaxTabWidth = MeasureSpec.getSize(widthMeasureSpec) / 2;
            }
        } else {
            mMaxTabWidth = -1;
        }

        final int oldWidth = getMeasuredWidth();
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        final int newWidth = getMeasuredWidth();

        if (lockedExpanded && oldWidth != newWidth) {
            // Recenter the tab display if we're at a new (scrollable) size.
            setCurrentItem(mSelectedTabIndex);
        }
    }

    private void animateToTab(final int position) {
        final View tabView = mTabLayout.getChildAt(position);
        //按需求 删除精选前面的图标
//        if (position == 0) {
//            ((TextView) mTabLayout.getChildAt(0)).setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_recommend_choiceness_light, 0, 0, 0);
//        } else {
//            ((TextView) mTabLayout.getChildAt(0)).setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_recommend_choiceness, 0, 0, 0);
//        }
        if (mTabSelector != null) {
            removeCallbacks(mTabSelector);
        }
        mTabSelector = new Runnable() {
            public void run() {
                final int scrollPos = tabView.getLeft() - (getWidth() - tabView.getWidth()) / 2;
                smoothScrollTo(scrollPos, 0);
                mTabSelector = null;
            }
        };
        post(mTabSelector);
    }

    @Override
    public void onAttachedToWindow() {
        super.onAttachedToWindow();
        if (mTabSelector != null) {
            // Re-post the selector we saved
            post(mTabSelector);
        }
    }

    @Override
    public void onDetachedFromWindow() {
        super.onDetachedFromWindow();
        if (mTabSelector != null) {
            removeCallbacks(mTabSelector);
        }
    }

    private void addTab(final int index, CharSequence text, int iconResId) {
        final TabView tabView = new TabView(getContext());
        int topRange = 1;
        tabView.mIndex = index;
        tabView.setFocusable(true);
        tabView.setOnClickListener(mTabClickListener);
        tabView.setText(text);
        tabView.setCompoundDrawablePadding(5);
        if (imgList != null) {
            if (!StringUtils.isEmpty(imgList.get(index).getImgUrl())) {
                tabView.setText("");
                if (fileExist(imgList.get(index).getImgUrl())) {
                    String path = downloadImg(imgList.get(index).getImgUrl());
                    tabView.setCompoundDrawablesWithIntrinsicBounds(resizedBitmap(path), null, null, null);
                } else {
                    new Thread(new Runnable() {
                        @Override
                        public void run() {
                            final String path = downloadImg(imgList.get(index).getImgUrl());
                            tabView.post(new Runnable() {
                                @Override
                                public void run() {
                                    tabView.setCompoundDrawablesWithIntrinsicBounds(resizedBitmap(path), null, null, null);
                                }
                            });
                        }
                    }).start();
                }
                topRange = 3;
            } else if (imgList.get(index).getImgId() != null &&
                    imgList.get(index).getImgId() > 0) {
                //按需求 删除精选前面的图标
//                tabView.setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_recommend_choiceness_light, 0, 0, 0);
                topRange = 3;
            } else {
                topRange = 1;
            }
        }
//        if (iconResId != 0) {
//            tabView.setCompoundDrawablesWithIntrinsicBounds(iconResId, 0, 0, 0);
//        }
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(WRAP_CONTENT, MATCH_PARENT, 1);
        params.setMargins(DimenUtils.dip2px(getContext(), 10), DimenUtils.dip2px(getContext(), topRange), DimenUtils.dip2px(getContext(), 10), DimenUtils.dip2px(getContext(), 1));
        mTabLayout.addView(tabView, params);
    }

    private Drawable resizedBitmap(String path) {
        Bitmap bpGoods = BitmapFactory.decodeFile(path);
        final int width = bpGoods.getWidth();
        int height = bpGoods.getHeight();
        float newHeight = DimenUtils.dip2px(getContext(), 12);
        float newWidth = newHeight * ((width * 1.0f) / height);
        float scaleWidth = newWidth / width;
        float scaleHeight = newHeight / height;
        Matrix matrix = new Matrix();
        matrix.postScale(scaleWidth, scaleHeight);
        // if you want to rotate the Bitmap
        // matrix.postRotate(45);
        Bitmap resizedBitmap = Bitmap.createBitmap(bpGoods, 0, 0, width,
                height, matrix, true);
        return new BitmapDrawable(getResources(), resizedBitmap);
    }

    private boolean fileExist(String url) {
        String[] params = url.split("/");
        String fileName = params[params.length - 1];
        String path = getContext().getExternalCacheDir().getPath() + "/recommend";
        File fileDir = new File(path);
        if (!fileDir.exists()) {
            fileDir.mkdirs();
        }
        File image = new File(fileDir.getPath(), fileName);
        if (image.exists()) {
            return true;
        } else {
            return false;
        }
    }

    private String downloadImg(String url) {
        String[] params = url.split("/");
        String fileName = params[params.length - 1];
        DownLoadFile df = new DownLoadFile();
        String path = getContext().getExternalCacheDir().getPath() + "/recommend";
        File fileDir = new File(path);
        if (!fileDir.exists()) {
            fileDir.mkdirs();
        }
        File image = new File(fileDir.getPath(), fileName);
        if (fileExist(url)) {
            return image.getPath();
        } else {
            try {
                File file = df.downLoadFile(null, image.getPath(), url, getContext());
                return file.getPath();
            } catch (Exception e) {
                return "";
            }

        }
    }

    @Override
    public void onPageScrollStateChanged(int arg0) {
        if (mListener != null) {
            mListener.onPageScrollStateChanged(arg0);
        }
    }

    @Override
    public void onPageScrolled(int arg0, float arg1, int arg2) {
        if (mListener != null) {
            mListener.onPageScrolled(arg0, arg1, arg2);
        }
    }

    @Override
    public void onPageSelected(int arg0) {
        setCurrentItem(arg0);
        if (mListener != null) {
            mListener.onPageSelected(arg0);
        }
    }

    public void setImgList(List<ImagePath> list) {
        imgList = list;
    }

    @Override
    public void setViewPager(ViewPager view) {
        if (mViewPager == view) {
            return;
        }
        if (mViewPager != null) {
            mViewPager.setOnPageChangeListener(null);
        }
        final PagerAdapter adapter = view.getAdapter();
        if (adapter == null) {
            throw new IllegalStateException("ViewPager does not have adapter instance.");
        }
        mViewPager = view;
        view.setOnPageChangeListener(this);
        notifyDataSetChanged();
    }

    public void notifyDataSetChanged() {
        mTabLayout.removeAllViews();
        PagerAdapter adapter = mViewPager.getAdapter();
        IconPagerAdapter iconAdapter = null;
        if (adapter instanceof IconPagerAdapter) {
            iconAdapter = (IconPagerAdapter) adapter;
        }
        final int count = adapter.getCount();
        for (int i = 0; i < count; i++) {
            CharSequence title = adapter.getPageTitle(i);
            if (title == null) {
                title = EMPTY_TITLE;
            }
            int iconResId = 0;
            if (iconAdapter != null) {
                iconResId = iconAdapter.getIconResId(i);
            }
            addTab(i, title, iconResId);
        }
        if (mSelectedTabIndex > count) {
            mSelectedTabIndex = count - 1;
        }
        setCurrentItem(mSelectedTabIndex);
        requestLayout();
    }

    @Override
    public void setViewPager(ViewPager view, int initialPosition) {
        setViewPager(view);
        setCurrentItem(initialPosition);
    }

    @Override
    public void setCurrentItem(int item) {
        if (mViewPager == null) {
            throw new IllegalStateException("ViewPager has not been bound.");
        }
        mSelectedTabIndex = item;
        mViewPager.setCurrentItem(item);

        final int tabCount = mTabLayout.getChildCount();
        for (int i = 0; i < tabCount; i++) {
            final View child = mTabLayout.getChildAt(i);
            final boolean isSelected = (i == item);
            child.setSelected(isSelected);
            if (isSelected) {
                animateToTab(item);
            }
        }
    }

    @Override
    public void setOnPageChangeListener(OnPageChangeListener listener) {
        mListener = listener;
    }

    private class TabView extends TextView {
        private int mIndex;

        public TabView(Context context) {
            super(context, null, R.attr.vpiTabPageIndicatorStyle);
        }

        @Override
        public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);

            // Re-measure if we went beyond our maximum size.
            if (mMaxTabWidth > 0 && getMeasuredWidth() > mMaxTabWidth) {
                super.onMeasure(MeasureSpec.makeMeasureSpec(mMaxTabWidth, MeasureSpec.EXACTLY),
                        heightMeasureSpec);
            }
        }

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