# JAD2JAR Creator PRO Third Edition, 0.2.0 ALPHA

'''

JAD2JAR Creator PRO Third Edition, 0.2.0 ALPHA
Created by Deusdies
Using Python 3 syntax

Program downloads JAR file based on the given JAR file

TODO:

- GUI in Qt
- Opening the default webbrowser if JAR file cannot be found
- Progress bar (if command-line edition retained)
- with GUI do: extract more info from the JAD file, such as size, etc.

'''

__author__ = 'Deusdies'
__version__ = '0.2ALPHA'

import os, sys, urllib.request, urllib.error

def find_url(file): # function that extracts the URL from JAD file
    with open(file) as file:
        for line in file:
            infourl = line.find("MIDlet-Info-URL")
            jarurl = line.find("MIDlet-Jar-URL")
            if infourl == 0:
                k = line.replace("MIDlet-Info-URL: ","")
                k = k.strip("\n")
            elif jarurl == 0:
                g = line.replace("MIDlet-Jar-URL: ","")
                g = g.strip("\n")
        # needs a procedure on what to do in case infourl and jarurl are not actually found (this is rarely the case)
        uri = k + g
        return uri

def downloadFile(URL,file='j2jdownload.jar'): # function that actually downloads the file
    metainfo = urllib.request.urlopen(URL).info()
    metainfo = str(metainfo)
    if "java-archive" in metainfo: # detects if the URL extracted is an actual JAR file, rather than HTML (since some
        print("Beginning download... \n") # developers put an address to their web page where JAR URL should be)
        with open(file,'wb') as f:
            r=urllib.request.urlopen(URL).read()
            f.write(r)
            print("Download finished! File saved as " + file + " in the selected directory")

    else:
        print("The URL is most likely not pointing to a real JAR file.")
        print("ERROR: Cannot download JAR file. Suggestion: copy/paste the URL provided below. Program now exiting.")
        print(URL)
        # here it'd be awesome if I could code so that the browser is opened automatically
        sys.exit(1) # exits

def checkFiles(jadfile): # checks if inputted includes extension and also if the file exists
    if not ".jad" in jadfile:
        r = jadfile + ".jad"
        if not os.path.exists(r):
            print("Could not find JAD file")
            sys.exit(1)
        return r
    else:
        r = jadfile
        return r

def validUrl(yorn): # yorn is y or no, questioning the user if the extracted URL looks valid
    if "Y" in yorn:
        return True
    elif "N" or "n" or "no" in yorn:
        return False
    else:
        print("No valid answer given!")
        sys.exit(1)

print ('''\n\n\n       ##########################################################
       #WELCOME TO JAD2JAR CREATOR 0.1.1 ALPHA PRO THIRD EDITION#
       ##########################################################
       \n''')

if len(sys.argv) < 2 and sys.argv != "help": # parsing arguments given
    jadfile = input("\nInput the name of the JAD file in the current directory\n\n>>> ")
    r = checkFiles(jadfile)
    jarfile = input("\nInput the name of the _JAR_ file (dl'ed file) in the current directory\n\n>>> ")
    if not ".jar" in jarfile:
        jarfile = jarfile + ".jar"

elif len(sys.argv) == 3 and sys.argv != "help":
    jadfile = sys.argv[1]
    r = checkFiles(jadfile)
    jarfile = sys.argv[2]
    if not ".jar" in jarfile:
        jarfile = jarfile + ".jar"

elif sys.argv[1] == "help":
    print("Usage: j2jarcreator.exe <jadfile> <jarfile>\nExample: j2jarcreator.exe operaMobile.jad operaDownloaded.jar")
    sys.exit(1)

else:
    print("Usage: j2jarcreator.exe <jadfile> <jarfile>\nExample: j2jarcreator.exe operaMobile.jad operaDownloaded.jar")
    sys.exit(1)

print("This is the URL I extracted:\n")
URL = find_url(r)
print(URL)

yorn = input("\nDoes this look like a valid URL to you? Capital Y or N\n\n>>> ")

if validUrl(yorn) == True:
    try:
        downloadFile(URL, jarfile)
    except urllib.error.URLError: # raises URLError in case network problems, or similar
        print("Cannot download file, check your internet connection!")
        sys.exit(1)

elif validUrl(yorn) == False:
    print("Sorry, but I couldn't extract the URL. :(")
    sys.exit(1)
else:
    pass