import io
import sys
from contextlib import redirect_stdout
from io import StringIO
import xml

import yaml
import ast_parser
from ast_generator.ast_generator import *
from ast_parser.gaz_unparser import *
from ast_parser.python_unparser import PythonUnparser
import inspect


class GazpreaFuzzer:
    def __init__(self, config: str):
        # parse a yaml config file with path in config
        # and set the appropriate parameters
        with open(config) as yaml_file:
            settings: dict = yaml.safe_load(yaml_file)
        self.settings = settings

        self.gaz_source_gen = None
        self.generator = AstGenerator(settings)

        self.ast = None
        self.source = None
        self.ground_truth = None
        self.out = None

        try:
            os.makedirs('debug/ast')
        except FileExistsError:
            pass

    def fuzz(self):
        self.generator.generate_ast()

        self.gaz_source_gen = GazUnparser(self.generator.ast, True)
        try:
            self.gaz_source_gen.unparse()
        except NoneTagException as n:
            raise NoneTagException("", n.xml)

        self.ast = self.generator.ast
        self.source = self.gaz_source_gen.source

        self.python_source_gen = PythonUnparser(self.generator.ast, True)
        self.python_source_gen.unparse()

        self.ground_truth = self.python_source_gen.source
        # input = "if __name__ == '__main__':\n    while True:\n        pass\n"  # debug

        with redirect_stdout(io.StringIO()) as buf:
            pass
            # exec(str(self.ground_truth))
            # exec(self.ground_truth, globals(), locals())  # FIXME the exec doesn't actually execute for some reason...
        self.write_ast()  # FIXME sometimes this is none

        self.out = buf.getvalue()

    def write_ast(self):
        dom = xml.dom.minidom.parseString(ET.tostring(self.generator.ast).decode('utf-8'))
        pretty: str = dom.toprettyxml()

        randint = random.randint(0, 1000)
        print(randint, file=sys.stderr)
        with open("debug/ast/debug_{}.xml".format(randint), 'w') as f:
            f.write(pretty)