from __future__ import unicode_literals
import unittest
import os
import shutil
import tempfile
from yaksh import code_evaluator as evaluator
from yaksh.java_code_evaluator import JavaCodeEvaluator
from yaksh.java_stdio_evaluator import JavaStdioEvaluator
from yaksh.settings import SERVER_TIMEOUT
from textwrap import dedent


class JavaAssertionEvaluationTestCases(unittest.TestCase):
    def setUp(self):
        with open('/tmp/test.txt', 'wb') as f:
            f.write('2'.encode('ascii'))
        tmp_in_dir_path = tempfile.mkdtemp()
        self.test_case_data = [
            {"test_case": "java_files/main_square.java"}
        ]
        self.in_dir = tmp_in_dir_path
        evaluator.SERVER_TIMEOUT = 9
        self.timeout_msg = ("Code took more than {0} seconds to run. "
            "You probably have an infinite loop in"
            " your code.").format(evaluator.SERVER_TIMEOUT)
        self.file_paths = None

    def tearDown(self):
        os.remove('/tmp/test.txt')
        shutil.rmtree(self.in_dir)

    def test_correct_answer(self):
        user_answer = "class Test {\n\tint square_num(int a) {\n\treturn a*a;\n\t}\n}"
        get_class = JavaCodeEvaluator(self.in_dir)
        kwargs = {'user_answer': user_answer, 
                    'test_case_data': self.test_case_data,
                    'file_paths': self.file_paths
                }
        result = get_class.evaluate(**kwargs)
        self.assertEqual(result.get('error'), "Correct answer")
        self.assertTrue(result.get('success'))

    def test_incorrect_answer(self):
        user_answer = "class Test {\n\tint square_num(int a) {\n\treturn a;\n\t}\n}"
        get_class = JavaCodeEvaluator(self.in_dir)
        kwargs = {'user_answer': user_answer, 
                    'test_case_data': self.test_case_data,
                    'file_paths': self.file_paths
                }
        result = get_class.evaluate(**kwargs)
        self.assertFalse(result.get('success'))
        lines_of_error = len(result.get('error').splitlines())
        self.assertFalse(result.get('success'))
        self.assertIn("Incorrect", result.get('error'))
        self.assertTrue(lines_of_error > 1)

    def test_error(self):
        user_answer = "class Test {\n\tint square_num(int a) {\n\treturn a*a"
        get_class = JavaCodeEvaluator(self.in_dir)
        kwargs = {'user_answer': user_answer, 
                    'test_case_data': self.test_case_data,
                    'file_paths': self.file_paths
                }
        result = get_class.evaluate(**kwargs) 
        self.assertFalse(result.get("success"))
        self.assertTrue("Error" in result.get("error"))

    def test_infinite_loop(self):
        user_answer = "class Test {\n\tint square_num(int a) {\n\t\twhile(0==0){\n\t\t}\n\t}\n}"
        get_class = JavaCodeEvaluator(self.in_dir)
        kwargs = {'user_answer': user_answer, 
                    'test_case_data': self.test_case_data,
                    'file_paths': self.file_paths
                }
        result = get_class.evaluate(**kwargs) 
        self.assertFalse(result.get("success"))
        self.assertEqual(result.get("error"), self.timeout_msg)

    def test_file_based_assert(self):
        self.file_paths = [("/tmp/test.txt", False)]
        self.test_case_data = [
            {"test_case": "java_files/read_file.java"}
        ]
        user_answer = dedent("""
            import java.io.BufferedReader;
            import java.io.FileReader;
            import java.io.IOException;
            class Test{
            String readFile() throws IOException {
            BufferedReader br = new BufferedReader(new FileReader("test.txt"));
            try {
                StringBuilder sb = new StringBuilder();
                String line = br.readLine();
                while (line != null) {
                    sb.append(line);
                    line = br.readLine();}
                return sb.toString();
            } finally {
                br.close();
            }}}
            """)
        get_class = JavaCodeEvaluator(self.in_dir)
        kwargs = {'user_answer': user_answer,
                  'test_case_data': self.test_case_data,
                  'file_paths': self.file_paths
                  }
        result = get_class.evaluate(**kwargs)
        self.assertTrue(result.get("success"))
        self.assertEqual(result.get("error"), "Correct answer")

class JavaStdioEvaluationTestCases(unittest.TestCase):

    def setUp(self):
        with open('/tmp/test.txt', 'wb') as f:
            f.write('2'.encode('ascii'))
        tmp_in_dir_path = tempfile.mkdtemp()
        self.in_dir = tmp_in_dir_path
        self.test_case_data = [{'expected_output': '11',
                               'expected_input': '5\n6'}]
        evaluator.SERVER_TIMEOUT = 4
        self.timeout_msg = ("Code took more than {0} seconds to run. "
                            "You probably have an infinite loop in"
                            " your code.").format(evaluator.SERVER_TIMEOUT)

    def tearDown(self):
        evaluator.SERVER_TIMEOUT = 4
        os.remove('/tmp/test.txt')
        shutil.rmtree(self.in_dir)

    def test_correct_answer(self):
        user_answer = dedent("""
        import java.util.Scanner;
        class Test
        {public static void main(String[] args){
         Scanner s = new Scanner(System.in);
         int a = s.nextInt();
         int b = s.nextInt();
         System.out.print(a+b);
        }}""")
        get_class = JavaStdioEvaluator(self.in_dir)
        kwargs = {'user_answer': user_answer,
                  'test_case_data': self.test_case_data
                  }
        result = get_class.evaluate(**kwargs)
        self.assertEqual(result.get('error'), "Correct answer")
        self.assertTrue(result.get('success'))

    def test_array_input(self):

        self.test_case_data = [{'expected_output': '561',
                                'expected_input': '5\n6\n1'}]
        user_answer = dedent("""
        import java.util.Scanner;
        class Test
        {public static void main(String[] args){
         Scanner s = new Scanner(System.in);
         int a[] = new int[3];
         for (int i=0;i<3;i++){
         a[i] = s.nextInt();
         System.out.print(a[i]);}
        }}""")
        get_class = JavaStdioEvaluator(self.in_dir)
        kwargs = {'user_answer': user_answer,
                  'test_case_data': self.test_case_data
                  }
        result = get_class.evaluate(**kwargs)
        self.assertEqual(result.get('error'), "Correct answer")
        self.assertTrue(result.get('success'))

    def test_incorrect_answer(self):

        user_answer = dedent("""
        import java.util.Scanner;
        class Test
        {public static void main(String[] args){
         Scanner s = new Scanner(System.in);
         int a = s.nextInt();
         int b = s.nextInt();
         System.out.print(a);
        }}""")
        get_class = JavaStdioEvaluator(self.in_dir)
        kwargs = {'user_answer': user_answer,
                  'test_case_data': self.test_case_data
                  }
        result = get_class.evaluate(**kwargs)
        lines_of_error = len(result.get('error').splitlines())
        self.assertFalse(result.get('success'))
        self.assertIn("Incorrect", result.get('error'))
        self.assertTrue(lines_of_error > 1)

    def test_error(self):

        user_answer = dedent("""
        class Test
        {
         System.out.print("a");
        }""")
        get_class = JavaStdioEvaluator(self.in_dir)
        kwargs = {'user_answer': user_answer,
                  'test_case_data': self.test_case_data
                  }
        result = get_class.evaluate(**kwargs)
        self.assertFalse(result.get("success"))
        self.assertTrue("Compilation Error" in result.get("error"))

    def test_infinite_loop(self):

        user_answer = dedent("""
        class Test
        {public static void main(String[] args){
         while(0==0)
         {
         System.out.print("a");}
        }}""")
        get_class = JavaStdioEvaluator(self.in_dir)
        kwargs = {'user_answer': user_answer,
                  'test_case_data': self.test_case_data
                  }
        result = get_class.evaluate(**kwargs)
        self.assertFalse(result.get("success"))
        self.assertEqual(result.get("error"), self.timeout_msg)

    def test_only_stdout(self):
        self.test_case_data = [{'expected_output': '11',
                               'expected_input': ''}]
        user_answer = dedent("""
        class Test
        {public static void main(String[] args){
         int a = 5;
         int b = 6;
         System.out.print(a+b);
        }}""")
        get_class = JavaStdioEvaluator(self.in_dir)
        kwargs = {'user_answer': user_answer,
                  'test_case_data': self.test_case_data
                  }
        result = get_class.evaluate(**kwargs)
        self.assertEqual(result.get('error'), "Correct answer")
        self.assertTrue(result.get('success'))

    def test_string_input(self):
        self.test_case_data = [{'expected_output': 'HelloWorld',
                               'expected_input': 'Hello\nWorld'}]
        user_answer = dedent("""
        import java.util.Scanner;
        class Test
        {public static void main(String[] args){
         Scanner s = new Scanner(System.in);
         String a = s.nextLine();
         String b = s.nextLine();
         System.out.print(a+b);
        }}""")
        get_class = JavaStdioEvaluator(self.in_dir)
        kwargs = {'user_answer': user_answer,
                  'test_case_data': self.test_case_data
                  }
        result = get_class.evaluate(**kwargs)
        self.assertEqual(result.get('error'), "Correct answer")
        self.assertTrue(result.get('success'))

    def test_file_based_stdout(self):
        self.file_paths = [("/tmp/test.txt", False)]
        self.test_case_data = [{'expected_output': '2',
                               'expected_input': ''}]
        user_answer = dedent("""
            import java.io.BufferedReader;
            import java.io.FileReader;
            import java.io.IOException;
            class Test{
            public static void main(String[] args) throws IOException {
            BufferedReader br = new BufferedReader(new FileReader("test.txt"));
            try {
                StringBuilder sb = new StringBuilder();
                String line = br.readLine();
                while (line != null) {
                    sb.append(line);
                    line = br.readLine();}
                System.out.print(sb.toString());
            } finally {
                br.close();
            }}}
            """)
        get_class = JavaStdioEvaluator(self.in_dir)
        kwargs = {'user_answer': user_answer,
                  'test_case_data': self.test_case_data,
                  'file_paths': self.file_paths
                  }
        result = get_class.evaluate(**kwargs)
        self.assertTrue(result.get("success"))
        self.assertEqual(result.get("error"), "Correct answer")


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