import unittest
import xml
import xml.dom.minidom

import yaml

from ast_generator.ast_generator import *
from ast_generator.utils import Variable


def reachable_return(block):
    return True  #TODO we actually need to check this


class TestGeneration(unittest.TestCase):

    @classmethod
    def setUpClass(cls):
        with open("config.yaml", 'r') as stream:
            props = yaml.safe_load(stream)
        cls.ast_gen = AstGenerator(props)

    def setUp(self):
        self.ast_gen.current_nesting_depth = 0
        self.ast_gen.current_control_flow_nesting_depth = 0

    def test_generate_literal(self):
        self.ast_gen.ast = ET.Element("block")
        self.ast_gen.current_ast_element = self.ast_gen.ast
        self.ast_gen.generate_literal('int')

        self.assertIsNotNone(self.ast_gen.ast.find(GAZ_LIT_TAG))
        self.assertEqual("int", self.ast_gen.ast.find(GAZ_LIT_TAG).get("type"))
        self.assertIsNotNone(self.ast_gen.ast.find(GAZ_LIT_TAG).get("value"))

        self.assertIsNotNone(ET.tostring(self.ast_gen.ast, 'utf-8').decode('utf-8'))

    def test_generate_variable(self):
        out: Variable = self.ast_gen.generate_variable('int')

        self.assertEqual("int", out.xml.get("type"))
        self.assertIsNotNone(out.xml.get("name"))
        self.assertIsNotNone(out.xml.get("mut"))

        self.assertIsNotNone(ET.tostring(out.xml, 'utf-8').decode('utf-8'))

    def test_generate_declaration(self):
        self.ast_gen.ast = ET.Element("block")
        self.ast_gen.current_ast_element = self.ast_gen.ast
        self.ast_gen.generate_declaration()

        self.assertIsNotNone(self.ast_gen.ast.find("declaration"))

        decl = self.ast_gen.ast.find("declaration")
        self.assertIsNotNone(decl.find("variable"))
        self.assertIsNotNone(decl.find("rhs"))

        # print(ET.tostring(decl, 'utf-8').decode('utf-8'))

    def test_generate_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.assertIsNotNone(self.ast_gen.ast.find("assignment"))

        decl = self.ast_gen.ast.find("assignment")

        # print(ET.tostring(decl, 'utf-8').decode('utf-8'))

        self.assertIsNotNone(decl.find("variable"))
        self.assertIsNotNone(decl.find("rhs"))

    def test_generate_bin_operation(self):
        self.ast_gen.ast = ET.Element("block")
        self.ast_gen.current_ast_element = self.ast_gen.ast
        self.ast_gen.generate_binary('+', 'int')

        self.assertIsNotNone(self.ast_gen.ast.find("operator"))
        operator = self.ast_gen.ast.find("operator")
        self.assertEqual('+', operator.get("op"))
        self.assertEqual('int', operator.get("type"))

    def test_generate_unary_operation(self):
        self.ast_gen.ast = ET.Element("block")
        self.ast_gen.current_ast_element = self.ast_gen.ast
        self.ast_gen.generate_unary('-', 'int')

        self.assertIsNotNone(self.ast_gen.ast.find("unary"))
        operator = self.ast_gen.ast.find("unary")
        self.assertEqual('-', operator.get("op"))
        self.assertEqual('int', operator.get("type"))

    def test_generate_stream(self):
        for type in ["std_input", "std_output"]:
            self.ast_gen.ast = ET.Element("block")
            self.ast_gen.current_ast_element = self.ast_gen.ast
            self.ast_gen.generate_in_stream()

            self.assertIsNotNone(self.ast_gen.ast.find("stream"))
            in_stream = self.ast_gen.ast.find("stream")
            self.assertEqual("std_input", in_stream.get("type"))

            lad = None
            for child in in_stream.iter():
                lad = child.attrib

            self.assertIsNotNone(lad)

    def test_generate_block(self):
        self.ast_gen.ast = ET.Element("block")
        self.ast_gen.current_ast_element = self.ast_gen.ast
        self.ast_gen.generate_block()

        self.assertIsNotNone(self.ast_gen.ast.find("block"))

        elem = None
        for child in self.ast_gen.ast.iter():
            elem = child.attrib
        self.assertIsNotNone(elem)

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

        # print(ET.tostring(self.ast_gen.ast, 'utf-8').decode('utf-8'))

        self.assertIsNotNone(self.ast_gen.current_ast_element.find("conditional"))
        conditional = self.ast_gen.ast.find("conditional")

        print(ET.tostring(conditional, 'utf-8').decode('utf-8'))

        opts = ['operator', 'unary_operator', 'literal', 'brackets']
        res = []
        for i in opts:
            res.append(conditional.find(i))
        res_list = list(filter(lambda x: x is not None, res))

        self.assertGreater(len(res_list), 0)

        block = conditional.findall("block")
        self.assertEqual(2, len(block))

    def test_generate_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.assertIsNotNone(self.ast_gen.ast.find("loop"))
        loop = self.ast_gen.ast.find("loop")

        # print(ET.tostring(loop, 'utf-8').decode('utf-8'))

        self.assertIsNotNone(loop.find("operator") or loop.find("unary_operator") or loop.find("literal"))

        block = loop.findall("block")
        self.assertEqual(1, len(block))


    def test_generate_routine(self):
        self.ast_gen.ast = ET.Element("block")
        self.ast_gen.current_ast_element = self.ast_gen.ast
        self.ast_gen.generate_routine()

        self.assertIsNotNone(self.ast_gen.ast.find("procedure") or self.ast_gen.ast.find("function"))
        routine = self.ast_gen.ast.find("procedure") or self.ast_gen.ast.find("function")

        # print(ET.tostring(routine, 'utf-8').decode('utf-8'))

        self.assertIsNotNone(routine.find("block"))
        self.assertIsNotNone(routine.find("argument"))

    def test_generate_function_ASSERT_RETURNS(self):
        self.ast_gen.ast = ET.Element("block")
        self.ast_gen.current_ast_element = self.ast_gen.ast
        self.ast_gen.generate_routine(routine_type="function")

        self.assertIsNotNone(self.ast_gen.ast.find("function"))
        routine = self.ast_gen.ast.find("function")

        # print(ET.tostring(routine, 'utf-8').decode('utf-8'))

        self.assertIsNotNone(routine.find("block"))
        self.assertIsNotNone(routine.find("argument"))

        block = routine.find("block")
        # print(ET.tostring(block, 'utf-8').decode('utf-8'))
        rets = block.find("return")
        # print(rets)
        self.assertLess(0, len(rets))
        self.assertTrue(reachable_return(block))


    def test_generate_main(self):
        self.ast_gen.ast = ET.Element("block")
        self.ast_gen.current_ast_element = self.ast_gen.ast
        self.ast_gen.generate_main()

        self.assertIsNotNone(self.ast_gen.ast.find("procedure"))
        out = self.ast_gen.ast.find("procedure")

        # print(ET.tostring(out, 'utf-8').decode('utf-8'))

        self.assertEqual("main", out.get("name"))
        self.assertEqual("int", out.get("return_type"))

        self.assertIsNotNone(out.find("block"))
        block = out.find("block")
        self.assertTrue(reachable_return(block))

        self.assertIsNone(out.find("argument"))

    def test_generate_ast(self):
        self.ast_gen.generate_ast()

        self.assertIsNotNone(self.ast_gen.ast)

        print(ET.tostring(self.ast_gen.ast, 'utf-8').decode('utf-8'))

        procedures = self.ast_gen.ast.findall("procedure")
        self.assertLess(0, len(procedures))

        main = False
        for proc in procedures:
            if proc.get("name") == "main":
                main = True
        self.assertTrue(main)

    def test_no_op_operation(self):
        for l in range(1000):
            # print("iteration: " + str(l))
            self.ast_gen.ast = ET.Element("block")
            self.ast_gen.current_ast_element = self.ast_gen.ast
            self.ast_gen.generate_int_expr()
            # self.write_ast()

            if self.ast_gen.ast.find("operator") is None:
                l -= 1
                continue
            operator = self.ast_gen.ast.find("operator")
            self.assertFalse(self.is_no_op(operator))

    def test_create_global(self):
        self.ast_gen.ast = ET.Element("block")
        self.ast_gen.current_ast_element = self.ast_gen.ast
        self.ast_gen.generate_main()

        global_block = self.ast_gen.current_ast_element
        global_scope = self.ast_gen.current_scope

        self.assertIsNotNone(self.ast_gen.ast.find("procedure"))
        self.ast_gen.current_ast_element = self.ast_gen.ast.find("procedure")
        self.ast_gen.generate_global()

        self.assertGreater(len(global_scope.symbols), 0)
        self.assertIsNotNone(global_block.find("declaration"))

    def test_generate_assignment_no_declaration(self):
        for l in range(1000):
            self.ast_gen.ast = ET.Element("block")
            self.ast_gen.current_ast_element = self.ast_gen.ast
            self.ast_gen.generate_declaration(mut='var')
            self.ast_gen.generate_assignment()

            self.assertIsNotNone(self.ast_gen.ast.find("assignment"))

            decl = self.ast_gen.ast.find("assignment")
            self.assertIsNone(decl.find("declaration"))

    def test_failing_assignment(self):
        self.ast_gen.ast = ET.Element("block")
        self.ast_gen.current_ast_element = self.ast_gen.ast
        with self.assertRaises(ValueError):
            self.ast_gen.generate_assignment()
            print(ET.tostring(self.ast_gen.ast, 'utf-8').decode('utf-8'))

        self.assertIsNone(self.ast_gen.ast.find("assignment"))

    def is_no_op(self, operator):
        """
        recursively check if operator is a no-op
        @param operator:
        @return:
        """
        res = False
        if operator.get("op") == '':
            return True
        else:
            lhs = operator.find("lhs")
            rhs = operator.find("rhs")
            if lhs.find("operator") is not None:
                res = self.is_no_op(lhs.find("operator"))
            elif lhs.find("unary") is not None:
                res = self.is_no_op(lhs.find("unary"))
            elif rhs.find("operator") is not None:
                res = self.is_no_op(rhs.find("operator"))
            elif rhs.find("unary") is not None:
                res = self.is_no_op(lhs.find("unary"))

        return res

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

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




if __name__ == '__main__':
    with open("config.yaml", 'r') as stream:
        props = yaml.safe_load(stream)
    ast_gen = AstGenerator(props)

    for a in range(20):
        ast_gen.generate_ast()
        ast = ast_gen.ast

        with open(f"xml/ast{a}.xml", 'x') as t:
            dom = xml.dom.minidom.parseString(ET.tostring(ast).decode('utf-8'))
            pretty: str = dom.toprettyxml()
            repretty = ""
            for line in pretty.split('\n'):
                if line.startswith("<?xml"):
                    pass
                else:
                    repretty += (line + '\n')

            t.write(repretty)