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import os.path
import unittest

from webkitpy.common.system.executive import Executive
from webkitpy.common.prettypatch import PrettyPatch


class PrettyPatchTest(unittest.TestCase):
    def check_ruby(self):
        executive = Executive()
        try:
            result = executive.run_command(['ruby', '--version'])
        except OSError, e:
            return False
        return True

    _diff_with_multiple_encodings = """
Index: utf8_test
===================================================================
--- utf8_test\t(revision 0)
+++ utf8_test\t(revision 0)
@@ -0,0 +1 @@
+utf-8 test: \xc2\xa0
Index: latin1_test
===================================================================
--- latin1_test\t(revision 0)
+++ latin1_test\t(revision 0)
@@ -0,0 +1 @@
+latin1 test: \xa0
"""

    def _webkit_root(self):
        webkitpy_common = os.path.dirname(__file__)
        webkitpy = os.path.dirname(webkitpy_common)
        scripts = os.path.dirname(webkitpy)
        webkit_tools = os.path.dirname(scripts)
        webkit_root = os.path.dirname(webkit_tools)
        return webkit_root

    def test_pretty_diff_encodings(self):
        if not self.check_ruby():
            return

        pretty_patch = PrettyPatch(Executive(), self._webkit_root())
        pretty = pretty_patch.pretty_diff(self._diff_with_multiple_encodings)
        self.assertTrue(pretty)  # We got some output
        self.assertTrue(isinstance(pretty, str))  # It's a byte array, not unicode

    def test_pretty_print_empty_string(self):
        if not self.check_ruby():
            return

        # Make sure that an empty diff does not hang the process.
        pretty_patch = PrettyPatch(Executive(), self._webkit_root())
        self.assertEqual(pretty_patch.pretty_diff(""), "")