# encoding: utf-8
"""Tests for IPython.core.ultratb
"""
import io
import sys
import os.path
from textwrap import dedent
import traceback
import unittest

from ..ultratb import ColorTB, VerboseTB


from IPython.testing import tools as tt
from IPython.testing.decorators import onlyif_unicode_paths
from IPython.utils.syspathcontext import prepended_to_syspath
from IPython.utils.tempdir import TemporaryDirectory
from IPython.utils.py3compat import PY3

ip = get_ipython()

file_1 = """1
2
3
def f():
  1/0
"""

file_2 = """def f():
  1/0
"""

class ChangedPyFileTest(unittest.TestCase):
    def test_changing_py_file(self):
        """Traceback produced if the line where the error occurred is missing?
        
        https://github.com/ipython/ipython/issues/1456
        """
        with TemporaryDirectory() as td:
            fname = os.path.join(td, "foo.py")
            with open(fname, "w") as f:
                f.write(file_1)
            
            with prepended_to_syspath(td):
                ip.run_cell("import foo")
            
            with tt.AssertPrints("ZeroDivisionError"):
                ip.run_cell("foo.f()")
            
            # Make the file shorter, so the line of the error is missing.
            with open(fname, "w") as f:
                f.write(file_2)
            
            # For some reason, this was failing on the *second* call after
            # changing the file, so we call f() twice.
            with tt.AssertNotPrints("Internal Python error", channel='stderr'):
                with tt.AssertPrints("ZeroDivisionError"):
                    ip.run_cell("foo.f()")
                with tt.AssertPrints("ZeroDivisionError"):
                    ip.run_cell("foo.f()")

iso_8859_5_file = u'''# coding: iso-8859-5

def fail():
    """дбИЖ"""
    1/0     # дбИЖ
'''

class NonAsciiTest(unittest.TestCase):
    @onlyif_unicode_paths
    def test_nonascii_path(self):
        # Non-ascii directory name as well.
        with TemporaryDirectory(suffix=u'é') as td:
            fname = os.path.join(td, u"fooé.py")
            with open(fname, "w") as f:
                f.write(file_1)
            
            with prepended_to_syspath(td):
                ip.run_cell("import foo")
            
            with tt.AssertPrints("ZeroDivisionError"):
                ip.run_cell("foo.f()")
    
    def test_iso8859_5(self):
        with TemporaryDirectory() as td:
            fname = os.path.join(td, 'dfghjkl.py')

            with io.open(fname, 'w', encoding='iso-8859-5') as f:
                f.write(iso_8859_5_file)
            
            with prepended_to_syspath(td):
                ip.run_cell("from dfghjkl import fail")
            
            with tt.AssertPrints("ZeroDivisionError"):
                with tt.AssertPrints(u'дбИЖ', suppress=False):
                    ip.run_cell('fail()')


class NestedGenExprTestCase(unittest.TestCase):
    """
    Regression test for the following issues:
    https://github.com/ipython/ipython/issues/8293
    https://github.com/ipython/ipython/issues/8205
    """
    def test_nested_genexpr(self):
        code = dedent(
            """\
            class SpecificException(Exception):
                pass

            def foo(x):
                raise SpecificException("Success!")

            sum(sum(foo(x) for _ in [0]) for x in [0])
            """
        )
        with tt.AssertPrints('SpecificException: Success!', suppress=False):
            ip.run_cell(code)


indentationerror_file = """if True:
zoon()
"""

class IndentationErrorTest(unittest.TestCase):
    def test_indentationerror_shows_line(self):
        # See issue gh-2398
        with tt.AssertPrints("IndentationError"):
            with tt.AssertPrints("zoon()", suppress=False):
                ip.run_cell(indentationerror_file)
        
        with TemporaryDirectory() as td:
            fname = os.path.join(td, "foo.py")
            with open(fname, "w") as f:
                f.write(indentationerror_file)
            
            with tt.AssertPrints("IndentationError"):
                with tt.AssertPrints("zoon()", suppress=False):
                    ip.magic('run %s' % fname)

se_file_1 = """1
2
7/
"""

se_file_2 = """7/
"""

class SyntaxErrorTest(unittest.TestCase):
    def test_syntaxerror_without_lineno(self):
        with tt.AssertNotPrints("TypeError"):
            with tt.AssertPrints("line unknown"):
                ip.run_cell("raise SyntaxError()")

    def test_changing_py_file(self):
        with TemporaryDirectory() as td:
            fname = os.path.join(td, "foo.py")
            with open(fname, 'w') as f:
                f.write(se_file_1)

            with tt.AssertPrints(["7/", "SyntaxError"]):
                ip.magic("run " + fname)

            # Modify the file
            with open(fname, 'w') as f:
                f.write(se_file_2)

            # The SyntaxError should point to the correct line
            with tt.AssertPrints(["7/", "SyntaxError"]):
                ip.magic("run " + fname)

    def test_non_syntaxerror(self):
        # SyntaxTB may be called with an error other than a SyntaxError
        # See e.g. gh-4361
        try:
            raise ValueError('QWERTY')
        except ValueError:
            with tt.AssertPrints('QWERTY'):
                ip.showsyntaxerror()


class Python3ChainedExceptionsTest(unittest.TestCase):
    DIRECT_CAUSE_ERROR_CODE = """
try:
    x = 1 + 2
    print(not_defined_here)
except Exception as e:
    x += 55
    x - 1
    y = {}
    raise KeyError('uh') from e
    """

    EXCEPTION_DURING_HANDLING_CODE = """
try:
    x = 1 + 2
    print(not_defined_here)
except Exception as e:
    x += 55
    x - 1
    y = {}
    raise KeyError('uh')
    """

    SUPPRESS_CHAINING_CODE = """
try:
    1/0
except Exception:
    raise ValueError("Yikes") from None
    """

    def test_direct_cause_error(self):
        if PY3:
            with tt.AssertPrints(["KeyError", "NameError", "direct cause"]):
                ip.run_cell(self.DIRECT_CAUSE_ERROR_CODE)

    def test_exception_during_handling_error(self):
        if PY3:
            with tt.AssertPrints(["KeyError", "NameError", "During handling"]):
                ip.run_cell(self.EXCEPTION_DURING_HANDLING_CODE)

    def test_suppress_exception_chaining(self):
        if PY3:
            with tt.AssertNotPrints("ZeroDivisionError"), \
                    tt.AssertPrints("ValueError", suppress=False):
                ip.run_cell(self.SUPPRESS_CHAINING_CODE)


#----------------------------------------------------------------------------

# module testing (minimal)
if sys.version_info > (3,):
    def test_handlers():
        def spam(c, d_e):
            (d, e) = d_e
            x = c + d
            y = c * d
            foo(x, y)

        def foo(a, b, bar=1):
            eggs(a, b + bar)

        def eggs(f, g, z=globals()):
            h = f + g
            i = f - g
            return h / i
        
        buff = io.StringIO()

        buff.write('')
        buff.write('*** Before ***')
        try:
            buff.write(spam(1, (2, 3)))
        except:
            traceback.print_exc(file=buff)

        handler = ColorTB(ostream=buff)
        buff.write('*** ColorTB ***')
        try:
            buff.write(spam(1, (2, 3)))
        except:
            handler(*sys.exc_info())
        buff.write('')

        handler = VerboseTB(ostream=buff)
        buff.write('*** VerboseTB ***')
        try:
            buff.write(spam(1, (2, 3)))
        except:
            handler(*sys.exc_info())
        buff.write('')