#!/usr/bin/env python
# vim:ts=4:sw=4:softtabstop=4:smarttab:expandtab

import sys
sys.path.append('lib')
import os, os.path, urllib
import Tkinter
import Tkconstants
import tkFileDialog
import tkMessageBox
from scrolltextwidget import ScrolledText
import subprocess
from subprocess import Popen, PIPE, STDOUT
import subasyncio
from subasyncio import Process

class MainDialog(Tkinter.Frame):
    def __init__(self, root):
        Tkinter.Frame.__init__(self, root, border=5)
        self.root = root
        self.interval = 1000
        self.p2 = None
        self.status = Tkinter.Label(self, text='Remove Encryption from a Kindle/Mobi/Topaz eBook')
        self.status.pack(fill=Tkconstants.X, expand=1)
        body = Tkinter.Frame(self)
        body.pack(fill=Tkconstants.X, expand=1)
        sticky = Tkconstants.E + Tkconstants.W
        body.grid_columnconfigure(1, weight=2)

        Tkinter.Label(body, text='Kindle/Mobi/Topaz eBook input file').grid(row=0, sticky=Tkconstants.E)
        self.mobipath = Tkinter.Entry(body, width=50)
        self.mobipath.grid(row=0, column=1, sticky=sticky)
        cwd = os.getcwdu()
        cwd = cwd.encode('utf-8')
        self.mobipath.insert(0, cwd)
        button = Tkinter.Button(body, text="...", command=self.get_mobipath)
        button.grid(row=0, column=2)

        Tkinter.Label(body, text='Directory for the Unencrypted Output File(s)').grid(row=1, sticky=Tkconstants.E)
        self.outpath = Tkinter.Entry(body, width=50)
        self.outpath.grid(row=1, column=1, sticky=sticky)
        cwd = os.getcwdu()
        cwd = cwd.encode('utf-8')
        outname = cwd
        self.outpath.insert(0, outname)
        button = Tkinter.Button(body, text="...", command=self.get_outpath)
        button.grid(row=1, column=2)
        
        Tkinter.Label(body, text='Optional Alternative Kindle.info file').grid(row=2, sticky=Tkconstants.E)
        self.altinfopath = Tkinter.Entry(body, width=50)
        self.altinfopath.grid(row=2, column=1, sticky=sticky)
        #cwd = os.getcwdu()
        #cwd = cwd.encode('utf-8')
        #self.altinfopath.insert(0, cwd)
        button = Tkinter.Button(body, text="...", command=self.get_altinfopath)
        button.grid(row=2, column=2)

        Tkinter.Label(body, text='Optional Comma Separated List of 10 Character PIDs (no spaces)').grid(row=3, sticky=Tkconstants.E)
        self.pidnums = Tkinter.StringVar()
        self.pidinfo = Tkinter.Entry(body, width=50, textvariable=self.pidnums)
        self.pidinfo.grid(row=3, column=1, sticky=sticky)

        Tkinter.Label(body, text='Optional Comma Separated List of 16 Character Kindle Serial Numbers (no spaces)').grid(row=4, sticky=Tkconstants.E)
        self.sernums = Tkinter.StringVar()
        self.serinfo = Tkinter.Entry(body, width=50, textvariable=self.sernums)
        self.serinfo.grid(row=4, column=1, sticky=sticky)


        msg1 = 'Conversion Log \n\n'
        self.stext = ScrolledText(body, bd=5, relief=Tkconstants.RIDGE, height=15, width=60, wrap=Tkconstants.WORD)
        self.stext.grid(row=6, column=0, columnspan=2,sticky=sticky)
        self.stext.insert(Tkconstants.END,msg1)

        buttons = Tkinter.Frame(self)
        buttons.pack()
        self.sbotton = Tkinter.Button(
            buttons, text="Start", width=10, command=self.convertit)
        self.sbotton.pack(side=Tkconstants.LEFT)

        Tkinter.Frame(buttons, width=10).pack(side=Tkconstants.LEFT)
        self.qbutton = Tkinter.Button(
            buttons, text="Quit", width=10, command=self.quitting)
        self.qbutton.pack(side=Tkconstants.RIGHT)

    # read from subprocess pipe without blocking
    # invoked every interval via the widget "after"
    # option being used, so need to reset it for the next time
    def processPipe(self):
        poll = self.p2.wait('nowait')
        if poll != None: 
            text = self.p2.readerr()
            text += self.p2.read()
            msg = text + '\n\n' + 'Encryption successfully removed\n'
            if poll == 1:
                msg = text + '\n\n' + 'Error: Encryption Removal Failed\n'
            if poll == 2:
                msg = text + '\n\n' + 'Input File was Not Encrypted - No Output File Needed\n'
            self.showCmdOutput(msg)
            self.p2 = None
            self.sbotton.configure(state='normal')
            return
        text = self.p2.readerr()
        text += self.p2.read()
        self.showCmdOutput(text)
        # make sure we get invoked again by event loop after interval 
        self.stext.after(self.interval,self.processPipe)
        return

    # post output from subprocess in scrolled text widget
    def showCmdOutput(self, msg):
        if msg and msg !='':
            # msg = msg.encode('utf-8')
            if sys.platform.startswith('win'):
                msg = msg.replace('\r\n','\n')
            self.stext.insert(Tkconstants.END,msg)
            self.stext.yview_pickplace(Tkconstants.END)
        return

    # run as a subprocess via pipes and collect stdout
    def mobirdr(self, infile, outfile, altinfopath, pidnums, sernums):
        # os.putenv('PYTHONUNBUFFERED', '1')
        tool = 'k4mobidedrm.py'
        pidoption = ''
        if pidnums and pidnums != '':
            pidoption = ' -p "' + pidnums + '" '
        seroption = ''
        if sernums and sernums != '':
            seroption = ' -s "' + sernums + '" '
        infooption = ''
        if altinfopath and altinfopath != '':
            infooption = ' -k "' + altinfopath + '" '
        cmdline = 'python ./lib/' + tool + ' ' + pidoption + seroption + infooption + '"' + infile + '" "' + outfile + '"'
        print cmdline
        if sys.platform.startswith('win'):
            search_path = os.environ['PATH']
            search_path = search_path.lower()
            if search_path.find('python') >= 0: 
                cmdline = 'python lib\\' + tool + ' ' + pidoption + seroption + infooption + '"' + infile + '" "' + outfile + '"'
            else :
                cmdline = 'lib\\' + tool + ' ' + pidoption + seroption + infooption + '"' + infile + '" "' + outfile + '"'

        cmdline = cmdline.encode(sys.getfilesystemencoding())
        p2 = Process(cmdline, shell=True, bufsize=1, stdin=None, stdout=PIPE, stderr=PIPE, close_fds=False)
        return p2


    def get_mobipath(self):
        cpath = self.mobipath.get()
        mobipath = tkFileDialog.askopenfilename(
            initialdir = cpath,
            parent=None, title='Select Kindle/Mobi/Topaz  eBook File',
            defaultextension='.prc', filetypes=[('Mobi eBook File', '.prc'), ('Mobi eBook File', '.azw'),('Mobi eBook File', '.mobi'),('Mobi eBook File', '.tpz'),('Mobi eBook File', '.azw1'),('Mobi azw4 eBook File', '.azw4'),('All Files', '.*')])
        if mobipath:
            mobipath = os.path.normpath(mobipath)
            self.mobipath.delete(0, Tkconstants.END)
            self.mobipath.insert(0, mobipath)
        return

    def get_outpath(self):
        cwd = os.getcwdu()
        cwd = cwd.encode('utf-8')
        outpath = tkFileDialog.askdirectory(
            parent=None, title='Directory to Store Unencrypted file(s) into',
            initialdir=cwd, initialfile=None)
        if outpath:
            outpath = os.path.normpath(outpath)
            self.outpath.delete(0, Tkconstants.END)
            self.outpath.insert(0, outpath)
        return

    def get_altinfopath(self):
        cwd = os.getcwdu()
        cwd = cwd.encode('utf-8')
        altinfopath = tkFileDialog.askopenfilename(
            parent=None, title='Select Alternative kindle.info File',
            defaultextension='.prc', filetypes=[('Kindle Info', '.info'),
                                                ('All Files', '.*')],
            initialdir=cwd)
        if altinfopath:
            altinfopath = os.path.normpath(altinfopath)
            self.altinfopath.delete(0, Tkconstants.END)
            self.altinfopath.insert(0, altinfopath)
        return

    def quitting(self):
        # kill any still running subprocess
        if self.p2 != None:
            if (self.p2.wait('nowait') == None):
                self.p2.terminate()
        self.root.destroy()

    # actually ready to run the subprocess and get its output
    def convertit(self):
        self.status['text'] = ''
        # now disable the button to prevent multiple launches
        self.sbotton.configure(state='disabled')
        mobipath = self.mobipath.get()
        outpath = self.outpath.get()
        altinfopath = self.altinfopath.get()
        pidnums = self.pidinfo.get()
        sernums = self.serinfo.get()

        if not mobipath or not os.path.exists(mobipath) or not os.path.isfile(mobipath):
            self.status['text'] = 'Specified Kindle Mobi eBook file does not exist'
            self.sbotton.configure(state='normal')
            return

        tpz = False
        # Identify any Topaz Files
        f = file(mobipath, 'rb')
        raw = f.read(3)
        if raw.startswith('TPZ'):
            tpz = True
        f.close()
        if not outpath:
            self.status['text'] = 'No output directory specified'
            self.sbotton.configure(state='normal')
            return
        if not os.path.isdir(outpath):
            self.status['text'] = 'Error specified output directory does not exist'
            self.sbotton.configure(state='normal')
            return
        if altinfopath and not os.path.exists(altinfopath):
            self.status['text'] = 'Specified kindle.info file does not exist'
            self.sbotton.configure(state='normal')
            return

        log = 'Command = "python k4mobidedrm.py"\n'
        if not tpz:
            log += 'Kindle/Mobi Path = "'+ mobipath + '"\n'
        else:
            log += 'Topaz Path = "'+ mobipath + '"\n'
        log += 'Output Directory = "' + outpath + '"\n'
        log += 'Kindle.info file = "' + altinfopath + '"\n'
        log += 'PID list = "' + pidnums + '"\n'
        log += 'Serial Number list = "' + sernums + '"\n'
        log += '\n\n'
        log += 'Please Wait ...\n\n'
        log = log.encode('utf-8')
        self.stext.insert(Tkconstants.END,log)
        self.p2 = self.mobirdr(mobipath, outpath, altinfopath, pidnums, sernums)

        # python does not seem to allow you to create
        # your own eventloop which every other gui does - strange 
        # so need to use the widget "after" command to force
        # event loop to run non-gui events every interval
        self.stext.after(self.interval,self.processPipe)
        return


def main(argv=None):
    root = Tkinter.Tk()
    root.title('Kindle/Mobi/Topaz eBook Encryption Removal')
    root.resizable(True, False)
    root.minsize(300, 0)
    MainDialog(root).pack(fill=Tkconstants.X, expand=1)
    root.mainloop()
    return 0
    

if __name__ == "__main__":
    sys.exit(main())