"""Tests for various magic functions specific to the terminal frontend.

Needs to be run by nose (to make ipython session available).
"""

#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------

import sys
from io import StringIO
from unittest import TestCase

import nose.tools as nt

from IPython.testing import tools as tt

#-----------------------------------------------------------------------------
# Test functions begin
#-----------------------------------------------------------------------------

def check_cpaste(code, should_fail=False):
    """Execute code via 'cpaste' and ensure it was executed, unless
    should_fail is set.
    """
    ip.user_ns['code_ran'] = False

    src = StringIO()
    if not hasattr(src, 'encoding'):
        # IPython expects stdin to have an encoding attribute
        src.encoding = None
    src.write(code)
    src.write('\n--\n')
    src.seek(0)

    stdin_save = sys.stdin
    sys.stdin = src

    try:
        context = tt.AssertPrints if should_fail else tt.AssertNotPrints
        with context("Traceback (most recent call last)"):
                ip.magic('cpaste')

        if not should_fail:
            assert ip.user_ns['code_ran'], "%r failed" % code
    finally:
        sys.stdin = stdin_save

def test_cpaste():
    """Test cpaste magic"""

    def runf():
        """Marker function: sets a flag when executed.
        """
        ip.user_ns['code_ran'] = True
        return 'runf' # return string so '+ runf()' doesn't result in success

    tests = {'pass': ["runf()",
                      "In [1]: runf()",
                      "In [1]: if 1:\n   ...:     runf()",
                      "> > > runf()",
                      ">>> runf()",
                      "   >>> runf()",
                      ],

             'fail': ["1 + runf()",
                      "++ runf()",
             ]}

    ip.user_ns['runf'] = runf

    for code in tests['pass']:
        check_cpaste(code)

    for code in tests['fail']:
        check_cpaste(code, should_fail=True)


class PasteTestCase(TestCase):
    """Multiple tests for clipboard pasting"""

    def paste(self, txt, flags='-q'):
        """Paste input text, by default in quiet mode"""
        ip.hooks.clipboard_get = lambda : txt
        ip.magic('paste '+flags)

    def setUp(self):
        # Inject fake clipboard hook but save original so we can restore it later
        self.original_clip = ip.hooks.clipboard_get

    def tearDown(self): 
        # Restore original hook
        ip.hooks.clipboard_get = self.original_clip
       
    def test_paste(self):
        ip.user_ns.pop('x', None)
        self.paste('x = 1')
        nt.assert_equal(ip.user_ns['x'], 1)
        ip.user_ns.pop('x')

    def test_paste_pyprompt(self):
        ip.user_ns.pop('x', None)
        self.paste('>>> x=2')
        nt.assert_equal(ip.user_ns['x'], 2)
        ip.user_ns.pop('x')

    def test_paste_py_multi(self):
        self.paste("""
        >>> x = [1,2,3]
        >>> y = []
        >>> for i in x:
        ...     y.append(i**2)
        ... 
        """)
        nt.assert_equal(ip.user_ns['x'], [1,2,3])
        nt.assert_equal(ip.user_ns['y'], [1,4,9])

    def test_paste_py_multi_r(self):
        "Now, test that self.paste -r works"
        self.test_paste_py_multi()
        nt.assert_equal(ip.user_ns.pop('x'), [1,2,3])
        nt.assert_equal(ip.user_ns.pop('y'), [1,4,9])
        nt.assert_false('x' in ip.user_ns)
        ip.magic('paste -r')
        nt.assert_equal(ip.user_ns['x'], [1,2,3])
        nt.assert_equal(ip.user_ns['y'], [1,4,9])

    def test_paste_email(self):
        "Test pasting of email-quoted contents"
        self.paste("""\
        >> def foo(x):
        >>     return x + 1
        >> xx = foo(1.1)""")
        nt.assert_equal(ip.user_ns['xx'], 2.1)

    def test_paste_email2(self):
        "Email again; some programs add a space also at each quoting level"
        self.paste("""\
        > > def foo(x):
        > >     return x + 1
        > > yy = foo(2.1)     """)
        nt.assert_equal(ip.user_ns['yy'], 3.1)

    def test_paste_email_py(self):
        "Email quoting of interactive input"
        self.paste("""\
        >> >>> def f(x):
        >> ...   return x+1
        >> ... 
        >> >>> zz = f(2.5)      """)
        nt.assert_equal(ip.user_ns['zz'], 3.5)

    def test_paste_echo(self):
        "Also test self.paste echoing, by temporarily faking the writer"
        w = StringIO()
        writer = ip.write
        ip.write = w.write
        code = """
        a = 100
        b = 200"""
        try:
            self.paste(code,'')
            out = w.getvalue()
        finally:
            ip.write = writer
        nt.assert_equal(ip.user_ns['a'], 100)
        nt.assert_equal(ip.user_ns['b'], 200)
        assert out == code+"\n## -- End pasted text --\n"

    def test_paste_leading_commas(self):
        "Test multiline strings with leading commas"
        tm = ip.magics_manager.registry['TerminalMagics']
        s = '''\
a = """
,1,2,3
"""'''
        ip.user_ns.pop('foo', None)
        tm.store_or_execute(s, 'foo')
        nt.assert_in('foo', ip.user_ns)


    def test_paste_trailing_question(self):
        "Test pasting sources with trailing question marks"
        tm = ip.magics_manager.registry['TerminalMagics']
        s = '''\
def funcfoo():
   if True: #am i true?
       return 'fooresult'
'''
        ip.user_ns.pop('funcfoo', None)
        self.paste(s)
        nt.assert_equal(ip.user_ns['funcfoo'](), 'fooresult')
