import sys
sys.path.append("../src")

import os
import json
import gzip
from collections.abc import MutableMapping
import tkinter as tk
from tkinter import LEFT,N,S,E,W
from colorsys import rgb_to_hsv

from PIL import Image,ImageTk

from analyzer.epoint import EPoint
from analyzer.corners import Corners


class Sampler:
	def __init__(self):
		self.dirname="../images"
		self.annotations=DataFile("annotations.json.gz")
		self.filenames=[f for f in os.listdir(self.dirname) if f.endswith(".jpg")]
		self.k=0

		self.img=None
		self.photo=None

		self.letter="_"
		self.hsv=(0,0,0)
		self.pos=(0,0)
		self.corners=Corners()
		self._dirty=False

		self._createGUI()

	def sample(self,e):
		try:
			(r,g,b)=(x/255 for x in self.img.getpixel((e.x,e.y)))
		except IndexError:
			return

		(h,s,v)=map(lambda x: round(x,3), rgb_to_hsv(r,g,b))
		self.hsv=(h,s,v)
		self.pos=(e.x,e.y)
		self.posLabel.configure(text="({0},{1})".format(e.x,e.y))
		self.colorLabel.configure(text="HSV: ({0}, {1}, {2})".format(round(h*360),s,v))

	def printSample(self):
		print("\t".join(map(str, (self.filenames[self.k],*self.pos,self.letter,*self.hsv))))

	def showImage(self):
		self.img=Image.open(os.path.join(self.dirname,self.filenames[self.k]))
		(w,h)=self.img.size
		self.photo=ImageTk.PhotoImage(self.img)
		self.canvas.delete("all")
		self.canvas.create_image(0,0,image=self.photo,anchor="nw")
		self.canvas.configure(width=w,height=h)

		self.corners=Corners(self.annotations.get(self.filenames[self.k]) or [])
		self._markCorners()

	def switchImage(self,step):
		self.save()
		n=len(self.filenames)
		self.k=(self.k+step+n)%n
		self.showImage()

	def setLetter(self,c):
		self.letter=c
		self.letterLabel.configure(text="Letter: {0}".format(c))

	def addCorner(self,e):
		self.corners.add(e.x,e.y)
		self.annotations[self.filenames[self.k]]=list(self.corners)
		self._dirty=True
		self._markCorners()

	def save(self):
		if self._dirty:
			self.annotations.save()
			self.dirty=False

	def _createGUI(self):
		root=tk.Tk()
		frame=tk.Frame(root)
		frame.grid(column=0,row=0,sticky=(N,S,E,W))

		self.canvas=tk.Canvas(frame)
		self.canvas.grid(row=1,column=0)

		bar=self._createBar(frame)
		bar.grid(row=2,column=0,sticky=(E,W))

		self.showImage()

		self.canvas.bind('<1>',lambda e: self.printSample())
		self.canvas.bind('<3>',self.addCorner)
		self.canvas.bind("<Motion>",self.sample)
		root.bind("<Left>",lambda e: self.switchImage(-1))
		root.bind("<Right>",lambda e: self.switchImage(1))
		root.bind("<b>",lambda e: self.setLetter("b"))
		root.bind("<e>",lambda e: self.setLetter("e"))
		root.bind("<w>",lambda e: self.setLetter("w"))

		root.mainloop()

	def _createBar(self,frame):
		bar=tk.Frame(frame,height=20,borderwidth=1,relief="sunken")
		self.letterLabel=tk.Label(bar,width=8,text="Letter: _")
		self.letterLabel.pack(side=LEFT)
		self.posLabel=tk.Label(bar,width=16,text="(,)")
		self.posLabel.pack(side=LEFT)
		self.colorLabel=tk.Label(bar,width=20,text="HSV: (,,)")
		self.colorLabel.pack(side=LEFT)

		return bar

	def _markCorners(self):
		self.canvas.delete("mark")
		for c in self.corners:
			(x,y)=(c.x,c.y)
			self.canvas.create_oval(x-2,y-2,x+2,y+2,fill="#00ff00",tags="mark")
		if self.corners.canonizeOrder():
			(a,b,c,d)=self.corners
			self.canvas.create_line(a.x,a.y,b.x,b.y,fill="#00ff00",tags="mark")
			self.canvas.create_line(b.x,b.y,c.x,c.y,fill="#00ff00",tags="mark")
			self.canvas.create_line(c.x,c.y,d.x,d.y,fill="#00ff00",tags="mark")
			self.canvas.create_line(d.x,d.y,a.x,a.y,fill="#00ff00",tags="mark")


class DataFile(MutableMapping):
	def __init__(self,filename):
		self.filename=filename
		try:
			with gzip.open(filename,mode="rt",encoding="utf8") as f:
				self._data=json.load(f,object_hook=self.deserialize)
		except OSError:
			self._data=dict()

	def save(self):
		with gzip.open(self.filename,mode="wt",encoding="utf8") as f:
			json.dump(self._data,f,default=self.serialize,indent="\t")

	def serialize(self,obj):
		if isinstance(obj,EPoint):
			return {"type": "EPoint", "val": [obj.x,obj.y]}
		raise TypeError(obj)

	def deserialize(self,obj):
		if obj.get("type")!="EPoint": return obj
		return EPoint(*obj["val"])

	def __getitem__(self, key): return self._data[key]
	def __setitem__(self, key, val): self._data[key]=val
	def __delitem__(self, key): del self._data[key]
	def __iter__(self): return iter(self._data)
	def __len__(self): return len(self._data)


s=Sampler()