#!/usr/bin/env python

from __future__ import print_function

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

from androguard import session
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',
    'nargs': 1
}
option_3 = {
    'name': ('-j', '--jar'),
    'help': 'output jar file',
    'action': 'count'
}

option_4 = {
    'name': ('-f', '--format'),
    'help': 'write the method in specific format (png, ...)',
    '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] == ";":
        return class_name[1:-1]
    return class_name


def create_directory(class_name, output):
    output_name = output
    if output_name[-1] != "/":
        output_name = output_name + "/"

    pathdir = output_name + class_name
    try:
        if not os.path.exists(pathdir):
            os.makedirs(pathdir)
    except OSError:
        # FIXME
        pass


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)

    output_name = output
    if output_name[-1] != "/":
        output_name = output_name + "/"

    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, 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

            filename_class = valid_class_name(method.get_class_name())
            create_directory(filename_class, output)

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

            filename_class = output_name + filename_class
            if filename_class[-1] != "/":
                filename_class = filename_class + "/"

            descriptor = method.get_descriptor()
            descriptor = descriptor.replace(";", "")
            descriptor = descriptor.replace(" ", "")
            descriptor = descriptor.replace("(", "-")
            descriptor = descriptor.replace(")", "-")
            descriptor = descriptor.replace("/", "_")

            filename = filename_class + method.get_name() + descriptor
            if len(method.get_name() + descriptor) > 250:
                all_identical_name_methods = vm.get_methods_descriptor(
                    method.get_class_name(), method.get_name())
                pos = 0
                for i in all_identical_name_methods:
                    if i.get_descriptor() == method.get_descriptor():
                        break
                    pos += 1

                filename = filename_class + method.get_name() + "_%d" % pos

            buff = method2dot(vmx.get_method(method))

            if form:
                print("%s ..." % form, end=' ')
                method2format(filename + "." + form, form, None, buff)

            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 = output_name + 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())

            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)
