import tkinter
import tkinter.filedialog
import re
#import canvas2svg
from math import *
import graph


class Application(tkinter.Frame):
	"""Application class"""
	def __init__(self):
		tkinter.Frame.__init__(self, window)

		#Window settings

		window.title("Settings")
		window.resizable(0, 0)
		window.geometry("{}x{}+{}+{}".format(
			550, 110,
			int((window.winfo_screenwidth() / 2) - 320),
			window.winfo_screenheight()))
		self.type = tkinter.StringVar()
		self.text = tkinter.StringVar()
		self.type.set("normal")
		self.graph = graph.Graph(20, 20)
		self.frame = self.graph.frame
		self.widgets()
		self.label()

	def widgets(self):
		"""Draws widgets"""
		
		#Labels

		self.label1 = tkinter.Label(window, textvariable=self.text)
		self.label2 = tkinter.Label(window, text="Interval:")
		self.label3 = tkinter.Label(window, text="Color:")

		#Textboxes

		self.textbox1 = tkinter.Entry(window)
		self.textbox2 = tkinter.Entry(window)
		self.textbox3 = tkinter.Entry(window)

		#Options

		self.choose1 = tkinter.Radiobutton(
			window,
			value="normal",
			text="Normal",
			variable=self.type,
			command=self.label)
		self.choose2 = tkinter.Radiobutton(
			window,
			value="punti",
			text="Points",
			variable=self.type,
			command=self.label)
		self.choose3 = tkinter.Radiobutton(
			window,
			value="piecewise",
			text="Piecewise",
			variable=self.type,
			command=self.label)

		#Pulsanti

		self.button1 = tkinter.Button(
			window,
			text="Plot",
			command=self.plot)
		self.button2 = tkinter.Button(
			window,
			text="Clear",
			command=self.clear)
		self.button3 = tkinter.Button(
			window,
			text="Clean Canvas",
			command=self.graph.clean)
		self.button4 = tkinter.Button(
			window,
			text="Save",
			command=self.save)
		self.button5 = tkinter.Button(
			window,
			text="Exit",
			command=self.exit)

		#Widgets layout
		
		self.label1.grid(
			column=0, row=0,
			sticky="nw",
			pady=5, padx=5)
		self.label2.grid(
			column=0, row=1,
			sticky="nw",
			pady=2.5, padx=5)
		self.label3.grid(
			column=0, row=2,
			sticky="nw",
			pady=2.5, padx=5)
		self.textbox1.grid(
			column=1, row=0,
			sticky="nw",
			pady=5, padx=5)
		self.textbox2.grid(
			column=1, row=1,
			sticky="nw",
			pady=2.5, padx=5)
		self.textbox3.grid(
			column=1, row=2,
			padx=5, pady=2.5)
		self.choose1.grid(
			column=2, row=1,
			sticky="nw",
			pady=2.5, padx=5)
		self.choose2.grid(
			column=3, row=1,
			sticky="nw",
			pady=2.5, padx=5)
		self.choose3.grid(
			column=4, row=1,
			sticky="nw",
			pady=2.5, padx=5)
		self.button1.grid(
			column=2, row=0,
			sticky="nwes",
			pady=2.5, padx=5)
		self.button2.grid(
			column=3, row=0,
			sticky="nwes",
			pady=2.5, padx=5)
		self.button3.grid(
			column=4, row=0,
			sticky="nwes",
			pady=2.5, padx=5)
		self.button4.grid(
			column=2, row=2,
			sticky="nwes",
			pady=2.5, padx=5,
			columnspan=2)
		self.button5.grid(
			column=4, row=2,
			sticky="nwes",
			pady=2.5, padx=5)

	def label(self):
		"""Change label basing on graph type"""
		if self.type.get() == "normal":
			self.text.set("f(x): y =")
		elif self.type.get() == "piecewise":
			self.text.set("[f1(x),(interval)],[f2(x),(interval)],...")
		else:
			self.text.set("(x1,y1),(x2,y2),...")

	def plot(self):
		"""Plot the data"""

		#Converte la function in modo che possa essere interpretata da eval().
		function = re.sub(
			"([\+-\-]?\d+)(x)",
			"\\1*x",
			self.textbox1.get().replace("^", "**"))
		function = re.sub(
			"(\|)(.+)(\|)",
			"abs(\\2)",
			function)
		function = re.sub(
			"(.+)(\!)",
			"factorial(\\1)",
			function)

		#Legge l'interval inserito.
		try:
			interval = eval(self.textbox2.get())
		except SyntaxError:
			start = -self.graph.X
			stop = self.graph.X
		else:
			start = float(interval[0])
			stop = float(interval[1])

		#Legge il color inserito.
		color = self.textbox3.get()
		if color == "":
			color = "orange"

		#Disegna il graph in base al type inserito.
		if self.type.get() == "normal":
			function = eval("lambda x:" + function)
			self.graph.plot(function, start, stop, color)
		elif self.type.get() == "piecewise":
			functions = re.sub("(\[\()(.+?\))", "\\1lambda x:\\2", function)
			functions = re.sub("(\[)", "(", functions.replace("]", ")"))
			for function in eval(functions):
				self.graph.plot(
					function[0],
					function[1][0],
					function[1][1],
					color)
		else:
			function = graph.punti(eval(self.textbox1.get()))
			self.graph.plot(
				function,
				punti[0][0],
				punti[len(punti) - 1][1],
				color)

	def clear(self):
		"""Clear entered data"""
		self.textbox1.delete(0, "end")
		self.textbox2.delete(0, "end")
		self.textbox3.delete(0, "end")

	def save(self):
		"""Save plot in svg"""
		settings = {
			"parent": self.frame,
			"defaultextension": ".svg",
			"initialfile": "graph.svg",
			"title": "Salva il graph"
		}
		file = tkinter.filedialog.asksaveasfilename(**settings)
		canvas2svg.saveall(file, self.canvas)
	
	def exit(self):
		window.destroy()
		self.frame.destroy()

window = tkinter.Tk()
app = Application()
app.mainloop()