import matplotlib
matplotlib.use("TkAgg")
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
from matplotlib.figure import Figure

from Tkinter import *
from PIL import Image, ImageTk
import tkSimpleDialog

import urllib
import urllib2
import json

import time

JUMP = 50
MAX_WIDTH = 20 * JUMP
MAX_HEIGHT = 20 * JUMP
address = "http://127.0.0.1:8001"
username = "test"

root = Tk()
event_entry = StringVar()

canvas = Canvas(root, width=MAX_WIDTH, height=MAX_HEIGHT, bg="white")

name = 0

class FakeLayer():
    def __init__(self, address):
        self.types = {}
        self.sources = {}
        self.targets = {}
        self.attrs = {}

    def read_available_attributes(self, name):
        if self.types[name] == "const":
            return ["value"]
        else:
            return []

    def read_attribute(self, name, attr):
        return self.attr.get(name, {}).get(attr, None)

    def set_attribute(self, name, attr, value):
        self.attrs[name][attr] = value

    def instantiate_block(self, name, block_type):
        self.types[name] = block_type

    def instantiate_link(self, name, link_type, source, target):
        self.types[name] = link_type
        self.sources[name] = source
        self.targets[name] = target
        self.attrs[name] = {}

    def simulate(self):
        pass

    def step(self):
        pass

    def pause(self):
        pass

attribute = []
available_attrs = []
simulation = []

def poll(address):
    working_available_attrs = []
    working_simulation = None

    while 1:
        returnvalue = json.loads(urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "get_output", "username": username}))).read())
        print("Process " + str(returnvalue))
        if (returnvalue.startswith("AVAILABLE_ATTR_VALUE")):
            working_available_attrs.append([json.loads(returnvalue.split(" ", 1)[1]), None])
        elif (returnvalue.startswith("AVAILABLE_ATTR_TYPE")):
            working_available_attrs[-1][1] = json.loads(returnvalue.split(" ", 1)[1])
        elif (returnvalue.startswith("AVAILABLE_ATTR_END")):
            available_attrs.append(working_available_attrs)
            working_available_attrs = []
        elif (returnvalue.startswith("ATTR_VALUE")):
            v = returnvalue.split(" ", 1)[1]
            if v == "None":
                v = None
            else:
                v = json.loads(v)
            attribute.append(v)
        elif (returnvalue.startswith("SIM_TIME")):
            working_simulation = (json.loads(returnvalue.split(" ", 1)[1]), {})
        elif (returnvalue.startswith("SIM_PROBE")):
            blockname, blockvalue = returnvalue.split(" ", 1)[1].rsplit(" ", 1)
            working_simulation[1][json.loads(blockname)] = json.loads(blockvalue)
        elif (returnvalue.startswith("SIM_END")):
            simulation.append(working_simulation)
            working_simulation = None
        elif (returnvalue.startswith("CONFORMANCE_OK")):
            root.configure(background="grey")
        elif (returnvalue.startswith("CONFORMANCE_FAIL")):
            root.configure(background="red")
        elif (returnvalue.startswith("ALGEBRAIC_LOOP")):
            root.configure(background="blue")
        else:
            print("Error: got unknown result: " + returnvalue)

class MvLayer():
    def __init__(self, address):
        import threading

        self.address = address
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "value": '"%s"' % username, "username": "user_manager"}))).read()
        thrd = threading.Thread(target=poll, args=[address])
        thrd.daemon = True
        thrd.start()

    def read_available_attributes(self, name):
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "value": '"read_available_attributes"', "username": username}))).read()
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "value": '"%s"' % name, "username": username}))).read()

        while not available_attrs:
            time.sleep(0.1)
        return available_attrs.pop(0)

    def read_attribute(self, name, attr):
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "value": '"read_attribute"', "username": username}))).read()
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "value": '"%s"' % name, "username": username}))).read()
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "value": '"%s"' % attr, "username": username}))).read()

        while not attribute:
            time.sleep(0.1)
        return attribute.pop(0)

    def set_attribute(self, name, attr, value):
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "value": '"set_attribute"', "username": username}))).read()
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "value": '"%s"' % name, "username": username}))).read()
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "value": '"%s"' % attr, "username": username}))).read()
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "value": json.dumps(value), "username": username}))).read()

    def instantiate_block(self, name, block_type):
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "value": '"instantiate_node"', "username": username}))).read()
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "value": '"%s"' % (block_type), "username": username}))).read()
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "value": '"%s"' % (name), "username": username}))).read()

    def instantiate_link(self, name, link_type, source, target):
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "value": '"instantiate_association"', "username": username}))).read()
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "value": '"%s"' % (link_type), "username": username}))).read()
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "value": '"%s"' % (name), "username": username}))).read()
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "value": '"%s"' % (source), "username": username}))).read()
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "value": '"%s"' % (target), "username": username}))).read()

    def simulate(self):
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "value": '"simulate"', "username": username}))).read()

    def step(self):
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "value": '"step"', "username": username}))).read()

    def pause(self):
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "value": '"pause"', "username": username}))).read()

    def delete(self, block):
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "value": '"delete_element"', "username": username}))).read()
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "value": '"%s"' % (block), "username": username}))).read()

def lower(value):
    return value / JUMP * JUMP

def upper(value):
    return (value / JUMP + 1) * JUMP

def avg(a, b):
    return float(a + b) / 2

class InterfaceCore():
    drawn = set()
    refs = dict()

    #mv = MvLayer(address)
    mv = FakeLayer(address)

    def delete(self, x, y):
        lname = self.find((x, y))
        self.mv.delete(lname)
        for i in self.refs[lname]:
            canvas.delete(i)
        del self.refs[lname]
        self.drawn = set([e for e in self.drawn if e[4] != lname])

    def clicked(self, event):
        if self.find((event.x, event.y)):
            # Something already there, so don't add, but modify
            lname = self.find((event.x, event.y))

            attrs = self.mv.read_available_attributes(lname)
            print("Managing " + str(attrs))

            if not attrs:
                print("No attrs to manage!")

            for attr, t in attrs:
                print("Reading data from " + str(attr))
                old_value = self.mv.read_attribute(lname, attr)
                if old_value == "None":
                    old_value = None

                new_value = tkSimpleDialog.askstring("Attribute modification", attr, initialvalue=old_value)
                if t == "Float":
                    new_value = float(new_value)
                elif t == "String":
                    new_value = str(new_value)
                else:
                    print("Got unknown type: " + str(t))
                self.mv.set_attribute(lname, attr, new_value)

        else:
            global name
            x = event.x
            y = event.y
            self.mv.instantiate_block(str(name), "State")
            r = canvas.create_oval(lower(x), lower(y), upper(x), upper(y), fill="white")
            b = (lower(x), lower(y), upper(x), upper(y), str(name))
            self.refs[str(name)] = [r]
            name += 1

    def find(self, location):
        def sqrt(a):
            return a**0.5

        x, y = location
        matches = []
        for e in self.drawn:
            x1, y1, x2, y2, x0, y0 = e[0], e[1], e[2], e[3], x, y
            distance = abs((y2 - y1) * x0 - (x2 - x1) * y0 + x2 * y1 - y2 * x1) / sqrt((y2 - y1) ** 2 + (x2 - x1) ** 2)
            matches.append((distance, e[4]))

        if matches:
            minimal_distance, name = sorted(matches)[0]
            print("Distance to " + name + " is " + str(minimal_distance))
            if minimal_distance < 10:
                return name

        return None

    def draw(self, start, end):
        source = self.find(start)
        target = self.find(end)

        print("Connect from %s to %s" % (source, target))

        if source and target:
            global name
            self.mv.instantiate_link(str(name), "Transition", source, target)
            self.refs[str(name)] = [canvas.create_line(start[0], start[1], end[0], end[1], fill="black", arrow=LAST)]
            self.drawn.add([start[0], start[1], end[0], end[1], str(name)])
            name += 1

core = InterfaceCore()

def clicked(event):
    core.clicked(event)

def draw(event):
    global start_location
    start_location = (event.x, event.y)

def release(event):
    core.draw(start_location, (event.x, event.y))

def simulate():
    core.mv.simulate()

def pause():
    core.mv.pause()

def delete(event):
    core.delete(event.x, event.y)

def add_event():
    core.add_event(event_entry.get())

buttons = [
        Button(root, text="START", command=simulate),
        Button(root, text="PAUSE", command=pause),
        Entry(root, textvariable=event_entry),
        Button(root, text="EVENT", command=add_event),
    ]

for i, b in enumerate(buttons):
    b.grid(row=0, column=i)

canvas.grid(row=1,column=0,columnspan=len(buttons))

core.canvas = canvas

for i in range(JUMP, MAX_HEIGHT, JUMP):
    canvas.create_line(0, i, MAX_HEIGHT, i, fill="grey")
for i in range(JUMP, MAX_WIDTH, JUMP):
    canvas.create_line(i, 0, i, MAX_WIDTH, fill="grey")

canvas.bind("<Button-1>", clicked)
canvas.bind("<Button-2>", delete)
canvas.bind("<Button-3>", draw)
canvas.bind("<ButtonRelease-3>", release)

visual = Toplevel(root)

# Example:
#    simulation = [(1, "A"), (3, "B"), (4, "A")]
simulation = [(1, "A"), (3, "B"), (4, "A")]

frame = Frame(visual)
frame.pack(fill=BOTH,expand=True)

f = Figure()
a = f.add_subplot(111)
a.plot([], [])
f.suptitle("Events")

fcanvas = FigureCanvasTkAgg(f, frame)
fcanvas.show()
fcanvas.get_tk_widget().pack()

reverse_lookup = {}

def update_graphs():
    times = [x[0] for x in simulation]
    events = [reverse_lookup.setdefault(x[1], len(reverse_lookup)) for x in simulation]
    lookup = [None] * len(reverse_lookup)
    for k, v in reverse_lookup.items():
        lookup[v] = k
    a.clear()
    a.plot(times, events, linestyle="none", marker="o")
    print("Lookup: " + str(lookup))
    print("Events:" + str(events))
    f.get_axes()[0].set_yticks(range(len(lookup)))
    f.get_axes()[0].set_yticklabels(lookup)
    fcanvas.draw()
    root.after(100, update_graphs)

root.after(100, update_graphs)
root.mainloop()