package com.app.wave.keyboard.utils;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;

public class FastBlurUtil {

    public static Bitmap fastBlur(Bitmap sentBitmap, int radius, boolean canReuseInBitmap) {
        // 图片缩放比例，提高模糊效率
        int scaleRatio = 8;
        int blurRadius = radius;

        if (sentBitmap == null || sentBitmap.isRecycled()) {
            return null;
        }

        int width = Math.max(sentBitmap.getWidth() / scaleRatio, 1);
        int height = Math.max(sentBitmap.getHeight() / scaleRatio, 1);

        Bitmap bitmap = sentBitmap.copy(sentBitmap.getConfig() != null ? sentBitmap.getConfig() : Bitmap.Config.ARGB_8888, true);

        if (canReuseInBitmap) {
            bitmap = sentBitmap;
        }

        // 创建缩放后的Bitmap
        Bitmap scaledBitmap = Bitmap.createScaledBitmap(bitmap, width, height, false);

        // 进行模糊处理
        Bitmap blurredBitmap = doBlur(scaledBitmap, blurRadius, true);

        // 缩放回原始尺寸
        Bitmap resultBitmap = Bitmap.createScaledBitmap(blurredBitmap, sentBitmap.getWidth(), sentBitmap.getHeight(), false);

        // 清理临时Bitmap
        if (scaledBitmap != null && scaledBitmap != blurredBitmap) {
            scaledBitmap.recycle();
        }
        if (blurredBitmap != null && blurredBitmap != resultBitmap) {
            blurredBitmap.recycle();
        }

        return resultBitmap;
    }

    private static Bitmap doBlur(Bitmap sentBitmap, int radius, boolean canReuseInBitmap) {
        Bitmap bitmap;
        if (canReuseInBitmap) {
            bitmap = sentBitmap;
        } else {
            bitmap = sentBitmap.copy(sentBitmap.getConfig(), true);
        }

        if (radius < 1) {
            return null;
        }

        int w = bitmap.getWidth();
        int h = bitmap.getHeight();

        int[] pix = new int[w * h];
        bitmap.getPixels(pix, 0, w, 0, 0, w, h);

        int wm = w - 1;
        int hm = h - 1;
        int wh = w * h;
        int div = radius + radius + 1;

        int[] r = new int[wh];
        int[] g = new int[wh];
        int[] b = new int[wh];
        int rsum, gsum, bsum, x, y, i, p, yp, yi, yw;
        int[] vmin = new int[Math.max(w, h)];

        int divsum = (div + 1) >> 1;
        divsum *= divsum;
        int[] dv = new int[256 * divsum];
        for (i = 0; i < 256 * divsum; i++) {
            dv[i] = (i / divsum);
        }

        yw = yi = 0;

        int[][] stack = new int[div][3];
        int stackpointer;
        int stackstart;
        int[] sir;
        int rbs;
        int r1 = radius + 1;
        int routsum, goutsum, boutsum;
        int rinsum, ginsum, binsum;

        for (y = 0; y < h; y++) {
            rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
            for (i = -radius; i <= radius; i++) {
                p = pix[Math.min(wm, Math.max(i, 0)) + y * w];
                sir = stack[i + radius];
                sir[0] = (p & 0xff0000) >> 16;
                sir[1] = (p & 0x00ff00) >> 8;
                sir[2] = (p & 0x0000ff);
                rbs = r1 - Math.abs(i);
                rsum += sir[0] * rbs;
                gsum += sir[1] * rbs;
                bsum += sir[2] * rbs;
                if (i > 0) {
                    rinsum += sir[0];
                    ginsum += sir[1];
                    binsum += sir[2];
                } else {
                    routsum += sir[0];
                    goutsum += sir[1];
                    boutsum += sir[2];
                }
            }
            stackpointer = radius;

            for (x = 0; x < w; x++) {
                r[yi] = dv[rsum];
                g[yi] = dv[gsum];
                b[yi] = dv[bsum];

                rsum -= routsum;
                gsum -= goutsum;
                bsum -= boutsum;

                stackstart = stackpointer - radius + div;
                sir = stack[stackstart % div];

                routsum -= sir[0];
                goutsum -= sir[1];
                boutsum -= sir[2];

                if (y == 0) {
                    vmin[x] = Math.min(x + radius + 1, wm);
                }
                p = pix[vmin[x] + y * w];

                sir[0] = (p & 0xff0000) >> 16;
                sir[1] = (p & 0x00ff00) >> 8;
                sir[2] = (p & 0x0000ff);
                rinsum += sir[0];
                ginsum += sir[1];
                binsum += sir[2];
                rsum += rinsum;
                gsum += ginsum;
                bsum += binsum;

                stackpointer = (stackpointer + 1) % div;
                sir = stack[(stackpointer) % div];

                routsum += sir[0];
                goutsum += sir[1];
                boutsum += sir[2];

                rinsum -= sir[0];
                ginsum -= sir[1];
                binsum -= sir[2];

                yi++;
            }
            yw += w;
        }
        for (x = 0; x < w; x++) {
            rinsum = ginsum = binsum = routsum = goutsum = boutsum = rsum = gsum = bsum = 0;
            yp = -radius * w;
            for (i = -radius; i <= radius; i++) {
                yi = Math.max(0, yp) + x;

                sir = stack[i + radius];

                sir[0] = r[yi];
                sir[1] = g[yi];
                sir[2] = b[yi];

                rbs = r1 - Math.abs(i);

                rsum += sir[0] * rbs;
                gsum += sir[1] * rbs;
                bsum += sir[2] * rbs;

                if (i > 0) {
                    rinsum += sir[0];
                    ginsum += sir[1];
                    binsum += sir[2];
                } else {
                    routsum += sir[0];
                    goutsum += sir[1];
                    boutsum += sir[2];
                }

                if (i < hm) {
                    yp += w;
                }
            }
            yi = x;
            stackpointer = radius;
            for (y = 0; y < h; y++) {
                // Preserve alpha channel: ( 0xff000000 & pix[yi] )
                pix[yi] = (0xff000000 & pix[yi]) | (dv[rsum] << 16) | (dv[gsum] << 8) | dv[bsum];

                rsum -= routsum;
                gsum -= goutsum;
                bsum -= boutsum;

                stackstart = stackpointer - radius + div;
                sir = stack[stackstart % div];

                routsum -= sir[0];
                goutsum -= sir[1];
                boutsum -= sir[2];

                if (x == 0) {
                    vmin[y] = Math.min(y + r1, hm) * w;
                }
                p = x + vmin[y];

                sir[0] = r[p];
                sir[1] = g[p];
                sir[2] = b[p];

                rinsum += sir[0];
                ginsum += sir[1];
                binsum += sir[2];

                rsum += rinsum;
                gsum += ginsum;
                bsum += binsum;

                stackpointer = (stackpointer + 1) % div;
                sir = stack[stackpointer];

                routsum += sir[0];
                goutsum += sir[1];
                boutsum += sir[2];

                rinsum -= sir[0];
                ginsum -= sir[1];
                binsum -= sir[2];

                yi += w;
            }
        }

        bitmap.setPixels(pix, 0, w, 0, 0, w, h);

        return bitmap;
    }

    public static Drawable blurDrawable(Drawable drawable, int blurRadius, Context context) {
        if (drawable == null) {
            return null;
        }

        try {
            // 将Drawable转换为Bitmap
            Bitmap bitmap;
            if (drawable instanceof BitmapDrawable) {
                BitmapDrawable bitmapDrawable = (BitmapDrawable) drawable;
                bitmap = bitmapDrawable.getBitmap();
                if (bitmap == null || bitmap.isRecycled()) {
                    return drawable;
                }
            } else {
                // 非BitmapDrawable，创建新的Bitmap
                bitmap = Bitmap.createBitmap(
                        drawable.getIntrinsicWidth(),
                        drawable.getIntrinsicHeight(),
                        Bitmap.Config.ARGB_8888
                );
                Canvas canvas = new Canvas(bitmap);
                drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
                drawable.draw(canvas);
            }

            // 应用模糊
            Bitmap blurredBitmap = fastBlur(bitmap, blurRadius, false);

            if (blurredBitmap != null && !blurredBitmap.isRecycled()) {
                return new BitmapDrawable(context.getResources(), blurredBitmap);
            }

            return drawable;
        } catch (Exception e) {
            e.printStackTrace();
            return drawable;
        }
    }
}