import tkinter as tk
from tkinter import *
from tkinter import ttk

import time  # For sleep, clock, time and perf_counter
from datetime import datetime

import numpy as np
import matplotlib.pyplot as plt
from matplotlib.figure import Figure
from matplotlib.backends.backend_tkagg import (FigureCanvasTkAgg, NavigationToolbar2Tk)

import ue9qol

class SinGen:
    def __init__(self, ampl=1, offset=0, phase=0, sweeper=None):
        self.ampl = ampl
        self.phase = phase
        self.sweeper = sweeper
        self.offset = offset

    def getValue(self, sweeper=None):
        if sweeper is None and self.sweeper is None:
            print("Error: generator needs sweeper")
            return 0
        if sweeper is None:
            sweeper = self.sweeper
        return self.ampl * np.sin( 2*np.pi*sweeper.getRelPos()) + self.offset


class Sweeper:
    def __init__(self, widget, start, stop, Npoints, SweepTime, onTicCallbacks=[]):
        # walk from start to stop with Npoints
        # cnt = 1 corresponds to start
        # cnt = Npoints corresponds to stop
        # variables like relVar are relative to the start of the period
        self.cnt = 0 # onTic will increase it right away
        self.widget = widget
        self.start = start
        self.stop = stop
        self.Npoints = Npoints
        self.SweepTime = SweepTime
        self.onTicCallbacks = onTicCallbacks
        self.isOn = False
        self.isRestart = True
        self.isTicRunning = False

        self.span = self.stop - self.start
        self.center = (self.stop + self.start)/2
        self.dPos = self.span/(self.Npoints-1)
        self.dT = self.SweepTime/(self.Npoints-1)
        self.dTmS = round(self.dT*1000) # dT in microSeconds

    def reset(self):
        self.cnt = 0 # onTic will increase it right away
        self.isRestart = False
        self.startTime = datetime.now()

    def onTic(self):
        if not self.isOn:
            self.isTicRunning = False
            return
        self.widget.after(self.dTmS, self.onTic)
        if self.isTicRunning:
            print("Overflow in Sweeper: need more time to finish a tic.")
            return
        self.isTicRunning = True
        if self.isRestart:
            self.reset()
            self.isRestart = False
        self.incr()
        for cb in self.onTicCallbacks:
            cb(self)
        self.isTicRunning = False
            
    def cmdRestart(self):
        self.cnt = 0
        if self.isOn:
            self.isRestart = True
            return
        self.reset()
        self.isOn = True
        self.onTic()

    def cmdStart(self):
        self.isOn = True
        self.onTic()

    def cmdStop(self):
        self.isOn = False

    def incr(self):
        self.cnt += 1
        self.updPos()

    def updPos(self):
        self.relCnt = 1 + ((self.cnt-1) % self.Npoints)
        self.pos = self.start + self.dPos * (self.relCnt - 1)
        self.relPos = (self.pos-self.start)/self.span

    def getCnt(self):
        return self.cnt

    def getRelCnt(self):
        return self.relCnt

    def getPos(self):
        return self.pos

    def getRelPos(self):
        return self.relPos

    
class Experiment:

    def __init__(self, root):
        self.root = root
        self.tic = 0
        self.data = {}
        self.data['tic'] = [] 
        self.data['ch1'] = []
        self.guiSetup(root)
        self.hardware = {}
        self.hardwareSetup()
        self.sweeper = Sweeper(self.root, 1, 10, 100, 10, onTicCallbacks=[self.onTic])
        self.funcGen = SinGen(1, 0, sweeper = self.sweeper)
        # self.root.after(1000, self.hello )
    
    def hardwareSetup(self):
        self.hardware['LabJack'] = ue9qol.UE9qol()

    def guiSetup(self, root): 

        self.bRestart=Button(root,text="RESTART",command=self.restart,font=('Arial','24'))
        self.bRestart.pack()

        self.bStart=Button(root,text="START",command=self.start,font=('Arial','24'))
        self.bStart.pack()

        self.bStop=Button(root,text="STOP",command=self.stop,font=('Arial','24'))
        self.bStop.pack()

        self.bExit=Button(root,text="EXIT",command=exit,font=('Arial','24'))
        self.bExit.pack()

        self.fig=plt.figure()

        self.ax = self.fig.add_subplot(1,1,1)
        # self.ax.set_xlim([0,20])
        # self.ax.set_ylim([0,20])
        self.ax.plot([i for i in range(10)],[i for i in range(10)])

        self.canvas = FigureCanvasTkAgg(self.fig, master = root)
        self.canvas.draw()

        # placing the canvas on the Tkinter window
        self.canvas.get_tk_widget().pack()
               
        # creating the Matplotlib toolbar
        self.toolbar = NavigationToolbar2Tk(self.canvas, root)
        self.toolbar.update()
                             
        # placing the toolbar on the Tkinter window
        self.canvas.get_tk_widget().pack()

    def stop(self):
        self.sweeper.cmdStop()

    def start(self):
        self.sweeper.cmdStart()

    def restart(self):
        self.sweeper.cmdRestart()

    def onTic(self,swp=None):
        if swp is None:
            swp = self.sweeper
        # self.root.after(1000, self.hello )
        # self.sweeper.incr()
        # tic = self.sweeper.getCnt()
        x =   swp.getRelPos()
        y =   self.funcGen.getValue(swp)
        # y =   self.sweeper.getPos()
        # self.hardware['LabJack'].setOutputCh(0, x/2)
        self.hardware['LabJack'].setOutputCh(0, 2)
        self.data['tic'].append(x)
        # y= self.hardware['LabJack'].getInputCh(1)
        # self.data['ch1'].append( self.hardware['LabJack'].getInputCh(1) )
        self.data['ch1'].append( y )
        start = datetime.now()
        self.ax.cla()
        self.ax.plot(self.data['tic'], self.data['ch1'])
        self.canvas.draw()
        stop = datetime.now()
        runTime = (stop-start).seconds + float((stop-start).microseconds)/1000000
        print("Replot took %s seconds to plot %s points." % (runTime, len(self.data['ch1'])) )

 
if __name__ == '__main__': 
    root=Tk()

    experiment=Experiment(root) 

    root.mainloop()