'''Demo for how easily we can provide a UI for popular open-source tools.'''
from . import ops
from .executors import one_by_one
from PIL import Image, ImageFilter
import base64
import io

ENV = 'Pillow'
op = ops.op_registration(ENV)
one_by_one.register(ENV, cache=False)

@op("Open image")
def open_image(*, filename: str):
  return Image.open(filename)

@op("Save image")
def save_image(image: Image, *, filename: str):
  image.save(filename)

@op("Crop")
def crop(image: Image, *, top: int, left: int, bottom: int, right: int):
  return image.crop((left, top, right, bottom))

@op("Flip horizontally")
def flip_horizontally(image: Image):
  return image.transpose(Image.Transpose.FLIP_LEFT_RIGHT)

@op("Flip verically")
def flip_vertically(image: Image):
  return image.transpose(Image.Transpose.FLIP_TOP_BOTTOM)

@op("Blur")
def blur(image: Image, *, radius: float = 5):
  return image.filter(ImageFilter.GaussianBlur(radius))

@op("Detail")
def detail(image: Image):
  return image.filter(ImageFilter.DETAIL)

@op("Edge enhance")
def edge_enhance(image: Image):
  return image.filter(ImageFilter.EDGE_ENHANCE)

@op("To grayscale")
def to_grayscale(image: Image):
  return image.convert('L')

@op("View image", view="image")
def view_image(image: Image):
  buffered = io.BytesIO()
  image.save(buffered, format="JPEG")
  b64 = base64.b64encode(buffered.getvalue()).decode("utf-8")
  data_url = 'data:image/jpeg;base64,' + b64
  return data_url