import sys
import unittest
from contextlib import redirect_stdout
from io import StringIO

import yaml

import xml.etree.ElementTree as ET

import signal

from ast_generator.ast_generator import AstGenerator
from ast_parser.python_unparser import PythonUnparser


class MyTestCase(unittest.TestCase):
    @classmethod
    def setUpClass(cls):
        with open("config.yaml", 'r') as stream:
            cls.props = yaml.safe_load(stream)

    def setUp(cls):
        cls.ast_gen = AstGenerator(cls.props)
        cls.python_unparser = PythonUnparser(cls.ast_gen.ast, True)
    def test_assignment(self):
        self.ast_gen.ast = ET.Element("block")
        self.ast_gen.current_ast_element = self.ast_gen.ast
        self.ast_gen.generate_declaration()
        self.ast_gen.generate_assignment()

        self.python_unparser.xml = self.ast_gen.ast
        self.python_unparser.unparse()

        try:
            exec(self.python_unparser.source)
        except Exception as e:
            self.fail(e)

    def test_binary_operator(self):
        self.ast_gen.ast = ET.Element("block")
        self.ast_gen.current_ast_element = self.ast_gen.ast
        self.ast_gen.generate_declaration()
        self.ast_gen.generate_binary('addition', 'int')

        self.python_unparser.xml = self.ast_gen.ast
        self.python_unparser.unparse()

        try:
            exec(self.python_unparser.source)
        except Exception as e:
            self.fail(e)

    def test_unary_operator(self):
        self.ast_gen.ast = ET.Element("block")
        self.ast_gen.current_ast_element = self.ast_gen.ast
        self.ast_gen.generate_declaration()
        self.ast_gen.generate_unary('negation', 'int')

        self.python_unparser.xml = self.ast_gen.ast
        self.python_unparser.unparse()

        try:
            exec(self.python_unparser.source)
        except Exception as e:
            print(self.python_unparser.source)
            self.fail(e)

    def test_output(self):
        self.ast_gen.ast = ET.Element("block")
        self.ast_gen.current_ast_element = self.ast_gen.ast
        self.ast_gen.generate_out_stream()

        output = StringIO()

        self.python_unparser.xml = self.ast_gen.ast
        self.python_unparser.unparse()

        with redirect_stdout(output):
            exec(self.python_unparser.source)

            try:
                exec(output.getvalue())
            except Exception as e:
                self.fail(e)

            outstring = output.getvalue()
            self.assertNotEqual("", outstring, self.python_unparser.source)

    def test_input(self):  #FIXME this doesn't actually accept user input, I think I need to create a global dict
                           # to store the input and then access it from the python in some way...
        self.ast_gen.ast = ET.Element("block")
        self.ast_gen.current_ast_element = self.ast_gen.ast
        self.ast_gen.generate_in_stream()

        self.python_unparser.xml = self.ast_gen.ast
        self.python_unparser.unparse()

        try:
            exec(self.python_unparser.source)
        except Exception as e:
            self.fail(e)

    def test_conditional(self):
        self.ast_gen.ast = ET.Element("block")
        self.ast_gen.current_ast_element = self.ast_gen.ast
        self.ast_gen.generate_conditional()

        self.python_unparser.xml = self.ast_gen.ast
        self.python_unparser.unparse()

        try:
            exec(self.python_unparser.source)
        except Exception as e:
            print(self.python_unparser.source)
            self.fail(e)

    def test_loop(self):
        self.ast_gen.ast = ET.Element("block")
        self.ast_gen.current_ast_element = self.ast_gen.ast
        self.ast_gen.generate_loop()

        self.python_unparser.xml = self.ast_gen.ast
        self.python_unparser.unparse()

        try:
            exec(self.python_unparser.source)
        except Exception as e:
            print(self.python_unparser.source)
            self.fail(e)



if __name__ == '__main__':
    unittest.main()