# Copyright (C) 2010 Chris Jerdonek (cjerdonek@webkit.org)
#
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# modification, are permitted provided that the following conditions
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# THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
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"""Unit tests for error_handlers.py."""

import unittest

from webkitpy.style.checker import StyleProcessorConfiguration
from webkitpy.style.error_handlers import DefaultStyleErrorHandler
from webkitpy.style.filter import FilterConfiguration


class DefaultStyleErrorHandlerTest(unittest.TestCase):

    """Tests the DefaultStyleErrorHandler class."""

    def setUp(self):
        self._error_messages = []
        self._error_count = 0

    _category = 'whitespace/tab'
    """The category name for the tests in this class."""

    _file_path = 'foo.h'
    """The file path for the tests in this class."""

    def _mock_increment_error_count(self):
        self._error_count += 1

    def _mock_stderr_write(self, message):
        self._error_messages.append(message)

    def _style_checker_configuration(self):
        """Return a StyleProcessorConfiguration instance for testing."""
        base_rules = ['-whitespace', '+whitespace/tab']
        filter_configuration = FilterConfiguration(base_rules=base_rules)

        return StyleProcessorConfiguration(
            filter_configuration=filter_configuration,
            max_reports_per_category={'whitespace/tab': 2},
            min_confidence=3,
            output_format='vs7',
            stderr_write=self._mock_stderr_write)

    def _error_handler(self, configuration, line_numbers=None):
        return DefaultStyleErrorHandler(configuration=configuration,
                                        file_path=self._file_path,
                                        increment_error_count=self._mock_increment_error_count,
                                        line_numbers=line_numbers)

    def _check_initialized(self):
        """Check that count and error messages are initialized."""
        self.assertEqual(0, self._error_count)
        self.assertEqual(0, len(self._error_messages))

    def _call_error_handler(self, handle_error, confidence, line_number=100):
        """Call the given error handler with a test error."""
        handle_error(line_number=line_number,
                     category=self._category,
                     confidence=confidence,
                     message='message')

    def test_eq__true_return_value(self):
        """Test the __eq__() method for the return value of True."""
        handler1 = self._error_handler(configuration=None)
        handler2 = self._error_handler(configuration=None)

        self.assertTrue(handler1.__eq__(handler2))

    def test_eq__false_return_value(self):
        """Test the __eq__() method for the return value of False."""
        def make_handler(configuration=self._style_checker_configuration(),
                         file_path='foo.txt', increment_error_count=lambda: True,
                         line_numbers=None):
            line_numbers = line_numbers or [100]
            return DefaultStyleErrorHandler(configuration=configuration,
                                            file_path=file_path,
                                            increment_error_count=increment_error_count,
                                            line_numbers=line_numbers)

        handler = make_handler()

        # Establish a baseline for our comparisons below.
        self.assertTrue(handler.__eq__(make_handler()))

        # Verify that a difference in any argument causes equality to fail.
        self.assertFalse(handler.__eq__(make_handler(configuration=None)))
        self.assertFalse(handler.__eq__(make_handler(file_path='bar.txt')))
        self.assertFalse(handler.__eq__(make_handler(increment_error_count=None)))
        self.assertFalse(handler.__eq__(make_handler(line_numbers=[50])))

    def test_ne(self):
        """Test the __ne__() method."""
        # By default, __ne__ always returns true on different objects.
        # Thus, check just the distinguishing case to verify that the
        # code defines __ne__.
        handler1 = self._error_handler(configuration=None)
        handler2 = self._error_handler(configuration=None)

        self.assertFalse(handler1.__ne__(handler2))

    def test_non_reportable_error(self):
        """Test __call__() with a non-reportable error."""
        self._check_initialized()
        configuration = self._style_checker_configuration()

        confidence = 1
        # Confirm the error is not reportable.
        self.assertFalse(configuration.is_reportable(self._category,
                                                     confidence,
                                                     self._file_path))
        error_handler = self._error_handler(configuration)
        self._call_error_handler(error_handler, confidence)

        self.assertEqual(0, self._error_count)
        self.assertEqual([], self._error_messages)

    # Also serves as a reportable error test.
    def test_max_reports_per_category(self):
        """Test error report suppression in __call__() method."""
        self._check_initialized()
        configuration = self._style_checker_configuration()
        error_handler = self._error_handler(configuration)

        confidence = 5

        # First call: usual reporting.
        self._call_error_handler(error_handler, confidence)
        self.assertEqual(1, self._error_count)
        self.assertEqual(1, len(self._error_messages))
        self.assertEqual(self._error_messages,
                         ['foo.h(100):  message  [whitespace/tab] [5]\n'])

        # Second call: suppression message reported.
        self._call_error_handler(error_handler, confidence)
        # The "Suppressing further..." message counts as an additional
        # message (but not as an addition to the error count).
        self.assertEqual(2, self._error_count)
        self.assertEqual(3, len(self._error_messages))
        self.assertEqual(self._error_messages[-2],
                         'foo.h(100):  message  [whitespace/tab] [5]\n')
        self.assertEqual(self._error_messages[-1],
                         'Suppressing further [whitespace/tab] reports '
                         'for this file.\n')

        # Third call: no report.
        self._call_error_handler(error_handler, confidence)
        self.assertEqual(3, self._error_count)
        self.assertEqual(3, len(self._error_messages))

    def test_line_numbers(self):
        """Test the line_numbers parameter."""
        self._check_initialized()
        configuration = self._style_checker_configuration()
        error_handler = self._error_handler(configuration,
                                            line_numbers=[50])
        confidence = 5

        # Error on non-modified line: no error.
        self._call_error_handler(error_handler, confidence, line_number=60)
        self.assertEqual(0, self._error_count)
        self.assertEqual([], self._error_messages)

        # Error on modified line: error.
        self._call_error_handler(error_handler, confidence, line_number=50)
        self.assertEqual(1, self._error_count)
        self.assertEqual(self._error_messages,
                         ['foo.h(50):  message  [whitespace/tab] [5]\n'])

        # Error on non-modified line after turning off line filtering: error.
        error_handler.turn_off_line_filtering()
        self._call_error_handler(error_handler, confidence, line_number=60)
        self.assertEqual(2, self._error_count)
        self.assertEqual(self._error_messages,
                         ['foo.h(50):  message  [whitespace/tab] [5]\n',
                          'foo.h(60):  message  [whitespace/tab] [5]\n',
                          'Suppressing further [whitespace/tab] reports for this file.\n'])