#!/usr/sbin/python2

from __future__ import print_function

import os
import re
import shutil
import sys
from optparse import OptionParser

from androguard import session
from androguard.misc import clean_file_name
from androguard.core import androconf
from androguard.core.bytecode import method2dot, method2format
from androguard.core.bytecodes import dvm
from androguard.decompiler import decompiler

option_0 = {
    'name': ('-i', '--input'),
    'help': 'file : use this filename',
    'nargs': 1
}
option_1 = {
    'name': ('-o', '--output'),
    'help': 'base directory to output all files',
    'nargs': 1
}
option_2 = {
    'name': ('-d', '--decompiler'),
    'help': 'choose a decompiler (default: use DAD)',
    'nargs': 1
}
option_3 = {
    'name': ('-j', '--jar'),
    'help': 'output jar file',
    'action': 'count'
}

option_4 = {
    'name': ('-f', '--format'),
    'help': 'write CFG of method in specific format (png, raw, ...)',
    'nargs': 1
}

option_5 = {
    'name': ('-l', '--limit'),
    'help': 'limit analysis to specific methods/classes by using a regexp',
    'nargs': 1
}

options = [option_0, option_1, option_2, option_3, option_4, option_5]


def valid_class_name(class_name):
    if class_name[-1] == ";":
        class_name = class_name[1:-1]
    return os.path.join(*class_name.split("/"))


def create_directory(pathdir):
    if not os.path.exists(pathdir):
        os.makedirs(pathdir)


def export_apps_to_format(filename,
                          s,
                          output,
                          methods_filter=None,
                          jar=None,
                          decompiler_type=None,
                          form=None):
    print("Dump information %s in %s" % (filename, output))

    if not os.path.exists(output):
        print("Create directory %s" % output)
        os.makedirs(output)
    else:
        print("Clean directory %s" % output)
        androconf.rrmdir(output)
        os.makedirs(output)

    methods_filter_expr = None
    if methods_filter:
        methods_filter_expr = re.compile(methods_filter)

    dump_classes = []
    for _, vm, vmx in s.get_objects_dex():
        print("Decompilation ...", end=' ')
        sys.stdout.flush()

        if decompiler_type == "dex2jad":
            vm.set_decompiler(decompiler.DecompilerDex2Jad(vm,
                                                           androconf.CONF["BIN_DEX2JAR"],
                                                           androconf.CONF["BIN_JAD"],
                                                           androconf.CONF["TMP_DIRECTORY"]))
        elif decompiler_type == "dex2winejad":
            vm.set_decompiler(decompiler.DecompilerDex2WineJad(vm,
                                                               androconf.CONF["BIN_DEX2JAR"],
                                                               androconf.CONF["BIN_WINEJAD"],
                                                               androconf.CONF["TMP_DIRECTORY"]))
        elif decompiler_type == "ded":
            vm.set_decompiler(decompiler.DecompilerDed(vm,
                                                       androconf.CONF["BIN_DED"],
                                                       androconf.CONF["TMP_DIRECTORY"]))
        elif decompiler_type == "dex2fernflower":
            vm.set_decompiler(decompiler.DecompilerDex2Fernflower(vm,
                                                                  androconf.CONF["BIN_DEX2JAR"],
                                                                  androconf.CONF["BIN_FERNFLOWER"],
                                                                  androconf.CONF["OPTIONS_FERNFLOWER"],
                                                                  androconf.CONF["TMP_DIRECTORY"]))

        print("End")

        if options.jar:
            print("jar ...", end=' ')
            filenamejar = decompiler.Dex2Jar(vm,
                                             androconf.CONF["BIN_DEX2JAR"],
                                             androconf.CONF["TMP_DIRECTORY"]).get_jar()
            shutil.move(filenamejar, os.path.join(output, "classes.jar"))
            print("End")

        for method in vm.get_methods():
            if methods_filter_expr:
                msig = "%s%s%s" % (method.get_class_name(), method.get_name(),
                                   method.get_descriptor())
                if not methods_filter_expr.search(msig):
                    continue

            # Current Folder to write to
            filename_class = valid_class_name(method.get_class_name())
            filename_class = os.path.join(output, filename_class)
            create_directory(filename_class)

            print("Dump %s %s %s ..." % (method.get_class_name(),
                                         method.get_name(),
                                         method.get_descriptor()), end=' ')

            filename = clean_file_name(os.path.join(filename_class, method.get_short_string()))

            buff = method2dot(vmx.get_method(method))
            # Write Graph of method
            if form:
                print("%s ..." % form, end=' ')
                method2format(filename + "." + form, form, None, buff)

            # Write the Java file for the whole class
            if method.get_class_name() not in dump_classes:
                print("source codes ...", end=' ')
                current_class = vm.get_class(method.get_class_name())
                current_filename_class = valid_class_name(current_class.get_name())

                current_filename_class = os.path.join(output, current_filename_class + ".java")
                with open(current_filename_class, "w") as fd:
                    fd.write(current_class.get_source())
                dump_classes.append(method.get_class_name())

            # Write SMALI like code
            print("bytecodes ...", end=' ')
            bytecode_buff = dvm.get_bytecodes_method(vm, vmx, method)
            with open(filename + ".ag", "w") as fd:
                fd.write(bytecode_buff)
            print()


def main(options, arguments):
    if options.input is not None and options.output is not None:
        s = session.Session()
        with open(options.input, "rb") as fd:
            s.add(options.input, fd.read())
            export_apps_to_format(options.input, s, options.output, options.limit,
                                  options.jar, options.decompiler, options.format)
    else:
        print("Please, specify an input file and an output directory")


if __name__ == "__main__":
    parser = OptionParser()
    for option in options:
        param = option['name']
        del option['name']
        parser.add_option(*param, **option)

    options, arguments = parser.parse_args()
    sys.argv[:] = arguments
    main(options, arguments)
