#!/usr/bin/env python
# -*- coding: utf8 -*-
"""
@file    launcher.py
@author  Jakob Erdmann
@date    2015-01-18
@version $Id: launcher.py 20433 2016-04-13 08:00:14Z behrisch $

This script acts as a GUI-wrapper around the sumo command-line applications

SUMO, Simulation of Urban MObility; see http://sumo.dlr.de/
Copyright (C) 2010-2016 DLR (http://www.dlr.de/) and contributors

This file is part of SUMO.
SUMO is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
"""
from __future__ import absolute_import
import os
import sys
import re
import subprocess
from Tkinter import *
from ttk import *
import tkFileDialog
from sumolib.options import Option, readOptions

THISDIR = os.path.dirname(__file__)
BINDIR = os.path.join(THISDIR, '..', 'bin')

APPLICATIONS = ['netconvert', 'netgenerate', 'polyconvert', 'od2trips', 'duarouter', 'jtrrouter',
                'dfrouter', 'marouter', 'sumo', 'sumo-gui', 'activitygen']


class ResizingCanvas(Canvas):

    """ a subclass of Canvas for dealing with resizing of windows
    http://stackoverflow.com/questions/22835289/how-to-get-tkinter-canvas-to-dynamically-resize-to-window-width
    """

    def __init__(self, parent, **kwargs):
        Canvas.__init__(self, parent, **kwargs)
        self.bind("<Configure>", self.on_resize)
        self.height = self.winfo_reqheight()
        self.width = self.winfo_reqwidth()

    def on_resize(self, event):
        # determine the ratio of old width/height to new width/height
        wscale = float(event.width) / self.width
        hscale = float(event.height) / self.height
        self.width = event.width - 2
        self.height = event.height - 2
        # print "on_resize %s %s %s %s" % (self.width, self.height,
        #        self.winfo_reqwidth(), self.winfo_reqheight())
        # resize the canvas
        self.config(width=self.width, height=self.height)
        # rescale all the objects tagged with the "all" tag
        self.scale("all", 0, 0, wscale, hscale)


class ScrollableFrame(Frame):

    def __init__(self, root):
        Frame.__init__(self, root)
        self.canvas = ResizingCanvas(self, borderwidth=0)
        self.frame = Frame(self.canvas)
        self.vsb = Scrollbar(
            self, orient="vertical", command=self.canvas.yview)
        self.canvas.configure(yscrollcommand=self.vsb.set)
        self.vsb.pack(side="right", fill="y")
        self.canvas.pack(side="left", fill="both", expand=True)
        self.canvas.create_window(
            (4, 4), window=self.frame, anchor="nw", tags="self.frame")
        self.frame.bind("<Configure>", self.OnFrameConfigure)

    def OnFrameConfigure(self, event):
        '''Reset the scroll region to encompass the inner frame'''
        # print "OnFrameConfigure"
        self.canvas.configure(scrollregion=self.canvas.bbox("all"))


def buildValueWidget(frame, optType):
    if optType == "FOO":
        pass
    else:
        var = StringVar()
        widget = Entry(frame, textvariable=var)
        return widget, var


class Launcher:

    def __init__(self, root, app, appOptions):
        self.title_prefix = "SUMO Application launcher"
        self.root = root
        self.appVar = StringVar()
        self.appVar.set(app)
        self.appOptions = appOptions
        self.optionValues = {}

        self.root.title(self.title_prefix)
        self.root.minsize(700, 200)
        numButtons = self.mainButtons()
        for i in range(numButtons):
            root.columnconfigure(i, weight=1)
        root.rowconfigure(0, weight=10)
        root.rowconfigure(1, weight=1)

        sFrame = ScrollableFrame(root)
        sFrame.grid(row=1, column="0", columnspan=numButtons, sticky="NSEW")
        self.optFrame = sFrame.frame

        self.buildAppOptions(appOptions)

        # define options for opening or saving a file
        self.file_opt = options = {}
        self.filedir = os.getcwd()
        options['defaultextension'] = 'cfg'
        options['filetypes'] = [('all files', '.*')]
        options['initialdir'] = self.filedir
        options['parent'] = root

    def buildAppOptions(self, appOptions):
        NAME, VALUE, HELP = range(3)
        row = 0
        for o in appOptions:
            row += 1
            Label(self.optFrame, text=o.name).grid(
                row=row, column=NAME, sticky="NW")
            widget, var = buildValueWidget(self.optFrame, o.type)
            self.optionValues[o.name] = var
            widget.grid(row=row, column=VALUE, sticky="NW")
            Label(self.optFrame, text=o.help, justify=LEFT).grid(
                row=row, column=HELP, sticky="NW")

    def mainButtons(self):
        row = 0
        col = 0
        self.buttons = []

        mb = Menubutton(self.root, text="Select Application")
        mb.menu = Menu(mb, tearoff=0)
        mb["menu"] = mb.menu
        for app in APPLICATIONS:
            mb.menu.add_radiobutton(label=app, variable=self.appVar,
                                    command=self.onSelectApp)
        mb.grid(row=row, column=col, sticky="NEW")
        col += 1

        self.buttons.append(mb)
        otherButtons = (
            ("Run %12s" % self.appVar.get(), self.runApp),
            ("load Config", self.loadCfg),
            ("Save Config", self.saveCfg),
            ("Save Config as", self.saveCfgAs),
            ("Quit", self.root.quit),
        )

        for text, command in otherButtons:
            self.buttons.append(Button(self.root, text=text, command=command))
            self.buttons[-1].grid(row=row, column=col, sticky="NEW")
            col += 1
        return len(self.buttons)

    def onSelectApp(self):
        self.buttons[1].configure(text="Run %12s" % self.appVar.get())

    def runApp(self):
        subprocess.call(os.path.join(BINDIR, self.appVar.get()))

    def loadCfg(self):
        self.file_opt['title'] = 'Load configuration file'
        filename = tkFileDialog.askopenfilename(**self.file_opt)
        self.root.title(self.title_prefix + " " + filename)
        self.loadedOptions = readOptions(filename)
        for o in self.loadedOptions:
            self.optionValues[o.name].set(o.value)

    def saveCfg(self):
        pass

    def saveCfgAs(self):
        pass


def parse_help(app):
    binary = os.path.join(BINDIR, app)
    reOpt = re.compile("--([^ ]*) (\w*) (.*$)")
    helpstring = subprocess.check_output([binary, '--help'])
    options = []
    optName = None
    optHelp = ""
    for line in helpstring.split(os.linesep):
        if '--' in line:
            if optName is not None:
                options.append(Option(optName, None, optType, optHelp))
            match = reOpt.search(line)
            if match is not None:
                optName = match.group(1)
                optType = match.group(2)
                optHelp = match.group(3).strip()
        elif "                                     " in line:
            optHelp += "\n" + line.strip()
    if optName is not None:
        if optType == '':
            optType = 'BOOL'
        options.append(Option(optName, None, optType, optHelp))

    return options


def main():
    app = "netconvert"
    appOptions = parse_help(app)
    #appOptions = []
    root = Tk()
    app = Launcher(root, app, appOptions)
    root.mainloop()

if __name__ == "__main__":
    main()
