package com.zlx.widget.shadow;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.graphics.Shader;

import androidx.annotation.NonNull;

import com.bumptech.glide.Glide;
import com.bumptech.glide.load.Transformation;
import com.bumptech.glide.load.engine.Resource;
import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
import com.bumptech.glide.load.resource.bitmap.BitmapResource;

import java.security.MessageDigest;

public class GlideRoundTransform implements Transformation<Bitmap> {
    private BitmapPool mBitmapPool;

    private float leftTop_radius;
    private float leftBottom_radius;
    private float rightTop_radius;
    private float rightBottom_radius;
    private boolean isLeftTop, isRightTop, isLeftBottom, isRightBotoom;


    /**
     * @param context 上下文
     */
    public GlideRoundTransform(Context context, float leftTop_radius, float leftBottom_radius, float rightTop_radius, float rightBottom_radius) {
        this.mBitmapPool = Glide.get(context).getBitmapPool();
        this.leftTop_radius = leftTop_radius;
        if (leftTop_radius != 0) {
            isLeftTop = true;
        }
        this.leftBottom_radius = leftBottom_radius;
        if (leftBottom_radius != 0) {
            isLeftBottom = true;
        }
        this.rightTop_radius = rightTop_radius;
        if (rightTop_radius != 0) {
            isRightTop = true;
        }
        this.rightBottom_radius = rightBottom_radius;
        if (rightBottom_radius != 0) {
            isRightBotoom = true;
        }
    }

    @NonNull
    @Override
    public Resource<Bitmap> transform(@NonNull Context context, @NonNull Resource<Bitmap> resource, int outWidth, int outHeight) {

        Bitmap source = resource.get();
        int finalWidth, finalHeight;
        //输出目标的宽高或高宽比例
        float scale;
        if (outWidth > outHeight) {
            //如果 输出宽度 > 输出高度 求高宽比

            scale = (float) outHeight / (float) outWidth;
            finalWidth = source.getWidth();
            //固定原图宽度,求最终高度
            finalHeight = (int) ((float) source.getWidth() * scale);
            if (finalHeight > source.getHeight()) {
                //如果 求出的最终高度 > 原图高度 求宽高比

                scale = (float) outWidth / (float) outHeight;
                finalHeight = source.getHeight();
                //固定原图高度,求最终宽度
                finalWidth = (int) ((float) source.getHeight() * scale);
            }
        } else if (outWidth < outHeight) {
            //如果 输出宽度 < 输出高度 求宽高比

            scale = (float) outWidth / (float) outHeight;
            finalHeight = source.getHeight();
            //固定原图高度,求最终宽度
            finalWidth = (int) ((float) source.getHeight() * scale);
            if (finalWidth > source.getWidth()) {
                //如果 求出的最终宽度 > 原图宽度 求高宽比

                scale = (float) outHeight / (float) outWidth;
                finalWidth = source.getWidth();
                finalHeight = (int) ((float) source.getWidth() * scale);
            }
        } else {
            //如果 输出宽度=输出高度
            finalHeight = source.getHeight();
            finalWidth = finalHeight;
        }

        //修正圆角
        this.leftTop_radius *= (float) finalHeight / (float) outHeight;
        this.leftBottom_radius *= (float) finalHeight / (float) outHeight;
        this.rightTop_radius *= (float) finalHeight / (float) outHeight;
        this.rightBottom_radius *= (float) finalHeight / (float) outHeight;
        Bitmap outBitmap = this.mBitmapPool.get(finalWidth, finalHeight, Bitmap.Config.ARGB_8888);
        if (outBitmap == null) {
            outBitmap = Bitmap.createBitmap(finalWidth, finalHeight, Bitmap.Config.ARGB_8888);
        }

        Canvas canvas = new Canvas(outBitmap);
        Paint paint = new Paint();
        //关联画笔绘制的原图bitmap
        BitmapShader shader = new BitmapShader(source, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
        //计算中心位置,进行偏移
        int width = (source.getWidth() - finalWidth) / 2;
        int height = (source.getHeight() - finalHeight) / 2;
        if (width != 0 || height != 0) {
            Matrix matrix = new Matrix();
            matrix.setTranslate((float) (-width), (float) (-height));
            shader.setLocalMatrix(matrix);
        }

        paint.setShader(shader);
        paint.setAntiAlias(true);
        RectF rectF = new RectF(0.0F, 0.0F, (float) canvas.getWidth(), (float) canvas.getHeight());

        float[] outerR = new float[]{leftTop_radius, leftTop_radius, rightTop_radius, rightTop_radius, rightBottom_radius, rightBottom_radius, leftBottom_radius, leftBottom_radius};//左上，右上，右下，左下
        Path path = new Path();
        path.addRoundRect(rectF, outerR, Path.Direction.CW);
        canvas.drawPath(path,paint);

        return BitmapResource.obtain(outBitmap, this.mBitmapPool);
    }


    @Override
    public void updateDiskCacheKey(@NonNull MessageDigest messageDigest) {
    }
}