# Natural Language Toolkit: GUI Demo for Glue Semantics with Discourse
#                           Representation Theory (DRT) as meaning language
#
# Author: Dan Garrette <dhgarrette@gmail.com>
#
# Copyright (C) 2001-2020 NLTK Project
# URL: <http://nltk.org/>
# For license information, see LICENSE.TXT

try:
    from tkinter import (
        Button,
        Frame,
        IntVar,
        Label,
        Listbox,
        Menu,
        Scrollbar,
        Tk,
    )
    from tkinter.font import Font
    from nltk.draw.util import CanvasFrame, ShowText

except ImportError:
    """Ignore ImportError because tkinter might not be available."""

from nltk.util import in_idle
from nltk.tag import RegexpTagger
from nltk.parse import MaltParser
from nltk.sem.logic import Variable
from nltk.sem.drt import DrsDrawer, DrtVariableExpression
from nltk.sem.glue import DrtGlue


class DrtGlueDemo(object):
    def __init__(self, examples):
        # Set up the main window.
        self._top = Tk()
        self._top.title("DRT Glue Demo")

        # Set up key bindings.
        self._init_bindings()

        # Initialize the fonts.self._error = None
        self._init_fonts(self._top)

        self._examples = examples
        self._readingCache = [None for example in examples]

        # The user can hide the grammar.
        self._show_grammar = IntVar(self._top)
        self._show_grammar.set(1)

        # Set the data to None
        self._curExample = -1
        self._readings = []
        self._drs = None
        self._drsWidget = None
        self._error = None

        self._init_glue()

        # Create the basic frames.
        self._init_menubar(self._top)
        self._init_buttons(self._top)
        self._init_exampleListbox(self._top)
        self._init_readingListbox(self._top)
        self._init_canvas(self._top)

        # Resize callback
        self._canvas.bind("<Configure>", self._configure)

    #########################################
    ##  Initialization Helpers
    #########################################

    def _init_glue(self):
        tagger = RegexpTagger(
            [
                ("^(David|Mary|John)$", "NNP"),
                (
                    "^(walks|sees|eats|chases|believes|gives|sleeps|chases|persuades|tries|seems|leaves)$",
                    "VB",
                ),
                ("^(go|order|vanish|find|approach)$", "VB"),
                ("^(a)$", "ex_quant"),
                ("^(every)$", "univ_quant"),
                ("^(sandwich|man|dog|pizza|unicorn|cat|senator)$", "NN"),
                ("^(big|gray|former)$", "JJ"),
                ("^(him|himself)$", "PRP"),
            ]
        )

        depparser = MaltParser(tagger=tagger)
        self._glue = DrtGlue(depparser=depparser, remove_duplicates=False)

    def _init_fonts(self, root):
        # See: <http://www.astro.washington.edu/owen/ROTKFolklore.html>
        self._sysfont = Font(font=Button()["font"])
        root.option_add("*Font", self._sysfont)

        # TWhat's our font size (default=same as sysfont)
        self._size = IntVar(root)
        self._size.set(self._sysfont.cget("size"))

        self._boldfont = Font(family="helvetica", weight="bold", size=self._size.get())
        self._font = Font(family="helvetica", size=self._size.get())
        if self._size.get() < 0:
            big = self._size.get() - 2
        else:
            big = self._size.get() + 2
        self._bigfont = Font(family="helvetica", weight="bold", size=big)

    def _init_exampleListbox(self, parent):
        self._exampleFrame = listframe = Frame(parent)
        self._exampleFrame.pack(fill="both", side="left", padx=2)
        self._exampleList_label = Label(
            self._exampleFrame, font=self._boldfont, text="Examples"
        )
        self._exampleList_label.pack()
        self._exampleList = Listbox(
            self._exampleFrame,
            selectmode="single",
            relief="groove",
            background="white",
            foreground="#909090",
            font=self._font,
            selectforeground="#004040",
            selectbackground="#c0f0c0",
        )

        self._exampleList.pack(side="right", fill="both", expand=1)

        for example in self._examples:
            self._exampleList.insert("end", ("  %s" % example))
        self._exampleList.config(height=min(len(self._examples), 25), width=40)

        # Add a scrollbar if there are more than 25 examples.
        if len(self._examples) > 25:
            listscroll = Scrollbar(self._exampleFrame, orient="vertical")
            self._exampleList.config(yscrollcommand=listscroll.set)
            listscroll.config(command=self._exampleList.yview)
            listscroll.pack(side="left", fill="y")

        # If they select a example, apply it.
        self._exampleList.bind("<<ListboxSelect>>", self._exampleList_select)

    def _init_readingListbox(self, parent):
        self._readingFrame = listframe = Frame(parent)
        self._readingFrame.pack(fill="both", side="left", padx=2)
        self._readingList_label = Label(
            self._readingFrame, font=self._boldfont, text="Readings"
        )
        self._readingList_label.pack()
        self._readingList = Listbox(
            self._readingFrame,
            selectmode="single",
            relief="groove",
            background="white",
            foreground="#909090",
            font=self._font,
            selectforeground="#004040",
            selectbackground="#c0f0c0",
        )

        self._readingList.pack(side="right", fill="both", expand=1)

        # Add a scrollbar if there are more than 25 examples.
        listscroll = Scrollbar(self._readingFrame, orient="vertical")
        self._readingList.config(yscrollcommand=listscroll.set)
        listscroll.config(command=self._readingList.yview)
        listscroll.pack(side="right", fill="y")

        self._populate_readingListbox()

    def _populate_readingListbox(self):
        # Populate the listbox with integers
        self._readingList.delete(0, "end")
        for i in range(len(self._readings)):
            self._readingList.insert("end", ("  %s" % (i + 1)))
        self._readingList.config(height=min(len(self._readings), 25), width=5)

        # If they select a example, apply it.
        self._readingList.bind("<<ListboxSelect>>", self._readingList_select)

    def _init_bindings(self):
        # Key bindings are a good thing.
        self._top.bind("<Control-q>", self.destroy)
        self._top.bind("<Control-x>", self.destroy)
        self._top.bind("<Escape>", self.destroy)
        self._top.bind("n", self.next)
        self._top.bind("<space>", self.next)
        self._top.bind("p", self.prev)
        self._top.bind("<BackSpace>", self.prev)

    def _init_buttons(self, parent):
        # Set up the frames.
        self._buttonframe = buttonframe = Frame(parent)
        buttonframe.pack(fill="none", side="bottom", padx=3, pady=2)
        Button(
            buttonframe,
            text="Prev",
            background="#90c0d0",
            foreground="black",
            command=self.prev,
        ).pack(side="left")
        Button(
            buttonframe,
            text="Next",
            background="#90c0d0",
            foreground="black",
            command=self.next,
        ).pack(side="left")

    def _configure(self, event):
        self._autostep = 0
        (x1, y1, x2, y2) = self._cframe.scrollregion()
        y2 = event.height - 6
        self._canvas["scrollregion"] = "%d %d %d %d" % (x1, y1, x2, y2)
        self._redraw()

    def _init_canvas(self, parent):
        self._cframe = CanvasFrame(
            parent,
            background="white",
            # width=525, height=250,
            closeenough=10,
            border=2,
            relief="sunken",
        )
        self._cframe.pack(expand=1, fill="both", side="top", pady=2)
        canvas = self._canvas = self._cframe.canvas()

        # Initially, there's no tree or text
        self._tree = None
        self._textwidgets = []
        self._textline = None

    def _init_menubar(self, parent):
        menubar = Menu(parent)

        filemenu = Menu(menubar, tearoff=0)
        filemenu.add_command(
            label="Exit", underline=1, command=self.destroy, accelerator="q"
        )
        menubar.add_cascade(label="File", underline=0, menu=filemenu)

        actionmenu = Menu(menubar, tearoff=0)
        actionmenu.add_command(
            label="Next", underline=0, command=self.next, accelerator="n, Space"
        )
        actionmenu.add_command(
            label="Previous", underline=0, command=self.prev, accelerator="p, Backspace"
        )
        menubar.add_cascade(label="Action", underline=0, menu=actionmenu)

        optionmenu = Menu(menubar, tearoff=0)
        optionmenu.add_checkbutton(
            label="Remove Duplicates",
            underline=0,
            variable=self._glue.remove_duplicates,
            command=self._toggle_remove_duplicates,
            accelerator="r",
        )
        menubar.add_cascade(label="Options", underline=0, menu=optionmenu)

        viewmenu = Menu(menubar, tearoff=0)
        viewmenu.add_radiobutton(
            label="Tiny",
            variable=self._size,
            underline=0,
            value=10,
            command=self.resize,
        )
        viewmenu.add_radiobutton(
            label="Small",
            variable=self._size,
            underline=0,
            value=12,
            command=self.resize,
        )
        viewmenu.add_radiobutton(
            label="Medium",
            variable=self._size,
            underline=0,
            value=14,
            command=self.resize,
        )
        viewmenu.add_radiobutton(
            label="Large",
            variable=self._size,
            underline=0,
            value=18,
            command=self.resize,
        )
        viewmenu.add_radiobutton(
            label="Huge",
            variable=self._size,
            underline=0,
            value=24,
            command=self.resize,
        )
        menubar.add_cascade(label="View", underline=0, menu=viewmenu)

        helpmenu = Menu(menubar, tearoff=0)
        helpmenu.add_command(label="About", underline=0, command=self.about)
        menubar.add_cascade(label="Help", underline=0, menu=helpmenu)

        parent.config(menu=menubar)

    #########################################
    ##  Main draw procedure
    #########################################

    def _redraw(self):
        canvas = self._canvas

        # Delete the old DRS, widgets, etc.
        if self._drsWidget is not None:
            self._drsWidget.clear()

        if self._drs:
            self._drsWidget = DrsWidget(self._canvas, self._drs)
            self._drsWidget.draw()

        if self._error:
            self._drsWidget = DrsWidget(self._canvas, self._error)
            self._drsWidget.draw()

    #########################################
    ##  Button Callbacks
    #########################################

    def destroy(self, *e):
        self._autostep = 0
        if self._top is None:
            return
        self._top.destroy()
        self._top = None

    def prev(self, *e):
        selection = self._readingList.curselection()
        readingListSize = self._readingList.size()

        # there are readings
        if readingListSize > 0:
            # if one reading is currently selected
            if len(selection) == 1:
                index = int(selection[0])

                # if it's on (or before) the first item
                if index <= 0:
                    self._select_previous_example()
                else:
                    self._readingList_store_selection(index - 1)

            else:
                # select its first reading
                self._readingList_store_selection(readingListSize - 1)

        else:
            self._select_previous_example()

    def _select_previous_example(self):
        # if the current example is not the first example
        if self._curExample > 0:
            self._exampleList_store_selection(self._curExample - 1)
        else:
            # go to the last example
            self._exampleList_store_selection(len(self._examples) - 1)

    def next(self, *e):
        selection = self._readingList.curselection()
        readingListSize = self._readingList.size()

        # if there are readings
        if readingListSize > 0:
            # if one reading is currently selected
            if len(selection) == 1:
                index = int(selection[0])

                # if it's on (or past) the last item
                if index >= (readingListSize - 1):
                    self._select_next_example()
                else:
                    self._readingList_store_selection(index + 1)

            else:
                # select its first reading
                self._readingList_store_selection(0)

        else:
            self._select_next_example()

    def _select_next_example(self):
        # if the current example is not the last example
        if self._curExample < len(self._examples) - 1:
            self._exampleList_store_selection(self._curExample + 1)
        else:
            # go to the first example
            self._exampleList_store_selection(0)

    def about(self, *e):
        ABOUT = (
            "NLTK Discourse Representation Theory (DRT) Glue Semantics Demo\n"
            + "Written by Daniel H. Garrette"
        )
        TITLE = "About: NLTK DRT Glue Demo"
        try:
            from tkinter.messagebox import Message

            Message(message=ABOUT, title=TITLE).show()
        except:
            ShowText(self._top, TITLE, ABOUT)

    def postscript(self, *e):
        self._autostep = 0
        self._cframe.print_to_file()

    def mainloop(self, *args, **kwargs):
        """
        Enter the Tkinter mainloop.  This function must be called if
        this demo is created from a non-interactive program (e.g.
        from a secript); otherwise, the demo will close as soon as
        the script completes.
        """
        if in_idle():
            return
        self._top.mainloop(*args, **kwargs)

    def resize(self, size=None):
        if size is not None:
            self._size.set(size)
        size = self._size.get()
        self._font.configure(size=-(abs(size)))
        self._boldfont.configure(size=-(abs(size)))
        self._sysfont.configure(size=-(abs(size)))
        self._bigfont.configure(size=-(abs(size + 2)))
        self._redraw()

    def _toggle_remove_duplicates(self):
        self._glue.remove_duplicates = not self._glue.remove_duplicates

        self._exampleList.selection_clear(0, "end")
        self._readings = []
        self._populate_readingListbox()
        self._readingCache = [None for ex in self._examples]
        self._curExample = -1
        self._error = None

        self._drs = None
        self._redraw()

    def _exampleList_select(self, event):
        selection = self._exampleList.curselection()
        if len(selection) != 1:
            return
        self._exampleList_store_selection(int(selection[0]))

    def _exampleList_store_selection(self, index):
        self._curExample = index
        example = self._examples[index]

        self._exampleList.selection_clear(0, "end")
        if example:
            cache = self._readingCache[index]
            if cache:
                if isinstance(cache, list):
                    self._readings = cache
                    self._error = None
                else:
                    self._readings = []
                    self._error = cache
            else:
                try:
                    self._readings = self._glue.parse_to_meaning(example)
                    self._error = None
                    self._readingCache[index] = self._readings
                except Exception as e:
                    self._readings = []
                    self._error = DrtVariableExpression(Variable("Error: " + str(e)))
                    self._readingCache[index] = self._error

                    # add a star to the end of the example
                    self._exampleList.delete(index)
                    self._exampleList.insert(index, ("  %s *" % example))
                    self._exampleList.config(
                        height=min(len(self._examples), 25), width=40
                    )

            self._populate_readingListbox()

            self._exampleList.selection_set(index)

            self._drs = None
            self._redraw()

    def _readingList_select(self, event):
        selection = self._readingList.curselection()
        if len(selection) != 1:
            return
        self._readingList_store_selection(int(selection[0]))

    def _readingList_store_selection(self, index):
        reading = self._readings[index]

        self._readingList.selection_clear(0, "end")
        if reading:
            self._readingList.selection_set(index)

            self._drs = reading.simplify().normalize().resolve_anaphora()

            self._redraw()


class DrsWidget(object):
    def __init__(self, canvas, drs, **attribs):
        self._drs = drs
        self._canvas = canvas
        canvas.font = Font(
            font=canvas.itemcget(canvas.create_text(0, 0, text=""), "font")
        )
        canvas._BUFFER = 3
        self.bbox = (0, 0, 0, 0)

    def draw(self):
        (right, bottom) = DrsDrawer(self._drs, canvas=self._canvas).draw()
        self.bbox = (0, 0, right + 1, bottom + 1)

    def clear(self):
        self._canvas.create_rectangle(self.bbox, fill="white", width="0")


def demo():
    examples = [
        "John walks",
        "David sees Mary",
        "David eats a sandwich",
        "every man chases a dog",
        #                'every man believes a dog yawns',
        #                'John gives David a sandwich',
        "John chases himself",
        #                'John persuades David to order a pizza',
        #                'John tries to go',
        #                'John tries to find a unicorn',
        #                'John seems to vanish',
        #                'a unicorn seems to approach',
        #                'every big cat leaves',
        #                'every gray cat leaves',
        #                'every big gray cat leaves',
        #                'a former senator leaves',
        #                'John likes a cat',
        #                'John likes every cat',
        #                'he walks',
        #                'John walks and he leaves'
    ]
    DrtGlueDemo(examples).mainloop()


if __name__ == "__main__":
    demo()