#!/usr/bin/env python3


import gi, io, base64, threading
from gi.repository import Gdk, GLib, GdkPixbuf, Gio, GObject
from PIL import Image, ImageFilter


empty_pixbuf = GdkPixbuf.Pixbuf.new(GdkPixbuf.Colorspace.RGB, True, 8, 1, 1)


def pixbuf_to_pil(pixbuf):
  data = pixbuf.get_pixels()
  w = pixbuf.get_width()
  h = pixbuf.get_height()
  stride = pixbuf.get_rowstride()
  mode = "RGBA" if pixbuf.get_has_alpha() else "RGB"
  img = Image.frombytes(mode, (w, h), data, "raw", mode, stride)
  return img


def pil_to_pixbuf(img):
  data = []
  for p in img.getdata():
    data.extend(p)
  data = bytes(data)
  alpha = img.mode == 'RGBA'
  w, h = img.size
  rowstride = w * 4
  try:
    return GdkPixbuf.Pixbuf.new_from_bytes(GLib.Bytes.new(data), GdkPixbuf.Colorspace.RGB, alpha, 8, w, h, rowstride)
  except:
    return empty_pixbuf


def pic_to_pixbuf(pic):
  data = pic.data
  input_stream = Gio.MemoryInputStream.new_from_data(data, None)
  try:
    return GdkPixbuf.Pixbuf.new_from_stream(input_stream, None)
  except:
    return empty_pixbuf

def base64_to_pixbuf(base64_str):
  data = base64.b64decode(base64_str)
  input_stream = Gio.MemoryInputStream.new_from_data(data, None)
  try:
    return GdkPixbuf.Pixbuf.new_from_stream(input_stream, None)
  except:
    return empty_pixbuf


def blur_image(pixbuf):
  # 加载图片并确认该图片为RGBA模式，保证透明度
  img = pixbuf_to_pil(pixbuf).convert('RGBA')
  mask = Image.new('RGBA', img.size, (64, 64, 64, 0))
  img = img.filter(ImageFilter.GaussianBlur(radius = 6))
  img.alpha_composite(mask)

  return pil_to_pixbuf(img)



# 定义一个异步修饰器, 用于在子线程中运行一些会阻塞主线程的任务
def run_async(func):
  def wrapper(*args, **kwargs):
    thread = threading.Thread(target=func, args=args, kwargs=kwargs)
    thread.daemon = True
    thread.start()
    return thread
  return wrapper

# 类型js的settimeout的修饰器
def set_timeout(timeout = 0.5):
  def decorator(callback):
    def wrapper(*args):
      t = threading.Timer(timeout, callback, args=args)
      t.start()
      return t
    return wrapper
  
  return decorator


# 定义一个修饰器, 用于将当前方法转到主线程中运行 (子线程中调用方法时)
def idle(func):
  def wrapper(*args):
    GObject.idle_add(func, *args)
  return wrapper