import logging

from PIL import ImageTk

import config
from .resizablecanvas import ResizableCanvas
from analyzer.corners import Corners
from analyzer.epoint import EPoint
from analyzer.grid import Grid
import analyzer

log=logging.getLogger(__name__)


class ImgView(ResizableCanvas):
	def __init__(self,gui,master=None):
		super().__init__(master)

		self._gui=gui
		self._corners=Corners()
		self._boardGrid=None

		self._img=None
		self._tkImg=None

		self.configure(width=480,height=360)
		self.bind('<1>',lambda e: self.addCorner(e.x,e.y))

	## Redraws the current image and its overlay.
	def redraw(self):
		self.delete("all")

		if self._img:
			w,h=self._img.size
			ratio=min(self._width/w, self._height/h)
			img=self._img.resize((int(w*ratio),int(h*ratio)))
			self._tkImg=ImageTk.PhotoImage(img) # just to save the image from garbage collector
			self.create_image(self._width//2, self._height//2, anchor="center", image=self._tkImg)

		for c in self._corners:
			self.markPoint(c.x,c.y)

		if self._boardGrid!=None and config.gui.showGrid:
			for r in range(19):
				a=self._boardGrid.intersections[r][0]
				b=self._boardGrid.intersections[r][-1]
				self.create_line(a.x,a.y,b.x,b.y,fill='#00ff00')
			for c in range(19):
				a=self._boardGrid.intersections[0][c]
				b=self._boardGrid.intersections[-1][c]
				self.create_line(a.x,a.y,b.x,b.y,fill='#00ff00')

		if self._boardGrid!=None and config.gui.showBigPoints:
			for r in range(19):
				for c in range(19):
					((r1,c1),(r2,c2))=analyzer.relevantRect(self._boardGrid.intersections[r][c], *(self._boardGrid.stoneSizeAt(r, c)))
					self.create_rectangle(r1,c1,r2,c2,outline="#00ffff")

	def setImg(self,img):
		self._img=img

	## Stores a grid corner located at x,y coordinates.
	def addCorner(self,x,y):
		self._corners.add(x,y)
		log.debug("click on %d,%d",x,y)
		if self._corners.is_canon():
			# transform corners from show coordinates to real coordinates
			self._boardGrid=Grid(self._corners)
			corners=[self._transformPoint(c) for c in self._corners]
			self._gui.detector.setCorners(corners)
			self._gui.preview()

		self.redraw()

	## Marks a point at the image with a green cross. Used for corners.
	def markPoint(self,x,y):
		self.create_line(x-3,y-3,x+4,y+4,fill="#00ff00")
		self.create_line(x-3,y+3,x+4,y-4,fill="#00ff00")

	def setUp(self):
		self.bind('<1>',lambda e: self.addCorner(e.x,e.y))

	def setRecording(self):
		self.bind('<1>',lambda e: None)

	def isSet(self):
		return self._img is not None

	def _onResize(self,event):
		w=self._width
		super()._onResize(event)
		self._corners.scale(self._width/w)
		if len(self._corners)==4:
			self._boardGrid=Grid(self._corners)
		self.redraw()

	def _transformPoint(self,point):
		w=int(self._width)
		h=int(self._height)
		wo,ho=self._img.size # o for original
		log.debug("image: %sx%s, view: %sx%s",wo,ho,w,h)
		widthRatio=wo/w
		heightRatio=ho/h
		imgSizeCoef=max(widthRatio,heightRatio)
		# shift compensates possible horizontal or vertical empty margins from unmatching aspect ratios
		imgShift=EPoint(wo-w*imgSizeCoef,ho-h*imgSizeCoef)/2
		return EPoint(self.canvasx(point.x),self.canvasy(point.y)) * imgSizeCoef + imgShift