"""Tests for IPython.lib.display.

"""
#-----------------------------------------------------------------------------
# Copyright (c) 2012, the IPython Development Team.
#
# Distributed under the terms of the Modified BSD License.
#
# The full license is in the file COPYING.txt, distributed with this software.
#-----------------------------------------------------------------------------

#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
from __future__ import print_function
from tempfile import NamedTemporaryFile, mkdtemp
from os.path import split

# Third-party imports
import nose.tools as nt

# Our own imports
from IPython.lib import display

#-----------------------------------------------------------------------------
# Classes and functions
#-----------------------------------------------------------------------------

#--------------------------
# FileLink tests
#--------------------------

def test_instantiation_FileLink():
    """Test classes can be instantiated"""
    fl = display.FileLink('example.txt')

def test_warning_on_non_existant_path_FileLink():
    """Calling _repr_html_ on non-existant files returns a warning"""
    fl = display.FileLink('example.txt')
    nt.assert_true(fl._repr_html_().startswith('Path (<tt>example.txt</tt>)'))

def test_existing_path_FileLink():
    """ Calling _repr_html_ functions as expected on existing filepath """
    tf = NamedTemporaryFile()
    fl = display.FileLink(tf.name)
    actual = fl._repr_html_()
    expected = "<a href='files/%s' target='_blank'>%s</a><br>" % (tf.name,tf.name)
    nt.assert_equal(actual,expected)

def test_existing_path_FileLink_repr():
    """ Calling repr() functions as expected on existing filepath """
    tf = NamedTemporaryFile()
    fl = display.FileLink(tf.name)
    actual = repr(fl)
    expected = tf.name
    nt.assert_equal(actual,expected)

#--------------------------
# FileLinks tests
#--------------------------

def test_instantiation_FileLinks():
    """Test classes can be instantiated"""
    fls = display.FileLinks('example')

def test_warning_on_non_existant_path_FileLinks():
    """Calling _repr_html_ on non-existant files returns a warning"""
    fls = display.FileLinks('example')
    nt.assert_true(fls._repr_html_().startswith('Path (<tt>example</tt>)'))

def test_existing_path_FileLinks():
    """ Calling _repr_html_ functions as expected on existing directory """
    td = mkdtemp()
    tf1 = NamedTemporaryFile(dir=td)
    tf2 = NamedTemporaryFile(dir=td)
    fl = display.FileLinks(td)
    actual = fl._repr_html_()
    actual = actual.split('\n')
    actual.sort()
    expected = ["%s/<br>" % td,
                "&nbsp;&nbsp;<a href='files/%s' target='_blank'>%s</a><br>" % (tf2.name,split(tf2.name)[1]),
                "&nbsp;&nbsp;<a href='files/%s' target='_blank'>%s</a><br>" % (tf1.name,split(tf1.name)[1])]
    expected.sort()
    # We compare the sorted list of links here as that's more reliable
    nt.assert_equal(actual,expected)

def test_existing_path_FileLinks_alt_formatter():
    """ Calling _repr_html_ functions as expected with an alternative formatter
    """
    td = mkdtemp()
    tf1 = NamedTemporaryFile(dir=td)
    tf2 = NamedTemporaryFile(dir=td)
    def fake_formatter(output_lines,dirname,fnames):
        output_lines.extend(["hello","world"])
        return
    fl = display.FileLinks(td,notebook_display_formatter=fake_formatter)
    actual = fl._repr_html_()
    actual = actual.split('\n')
    actual.sort()
    expected = ["hello","world"]
    expected.sort()
    # We compare the sorted list of links here as that's more reliable
    nt.assert_equal(actual,expected)

def test_existing_path_FileLinks_repr():
    """ Calling repr() functions as expected on existing directory """
    td = mkdtemp()
    tf1 = NamedTemporaryFile(dir=td)
    tf2 = NamedTemporaryFile(dir=td)
    fl = display.FileLinks(td)
    actual = repr(fl)
    actual = actual.split('\n')
    actual.sort()
    expected = ['%s/' % td, '  %s' % split(tf1.name)[1],'  %s' % split(tf2.name)[1]]
    expected.sort()
    # We compare the sorted list of links here as that's more reliable
    nt.assert_equal(actual,expected)
    
def test_existing_path_FileLinks_repr_alt_formatter():
    """ Calling repr() functions as expected with an alternative formatter
    """
    td = mkdtemp()
    tf1 = NamedTemporaryFile(dir=td)
    tf2 = NamedTemporaryFile(dir=td)
    def fake_formatter(output_lines,dirname,fnames):
        output_lines.extend(["hello","world"])
        return
    fl = display.FileLinks(td,terminal_display_formatter=fake_formatter)
    actual = repr(fl)
    actual = actual.split('\n')
    actual.sort()
    expected = ["hello","world"]
    expected.sort()
    # We compare the sorted list of links here as that's more reliable
    nt.assert_equal(actual,expected)

#--------------------------
# DirectoryLink tests
#--------------------------

def test_instantiation_DirectoryLink():
    """Test classes can be instantiated"""
    dl = display.DirectoryLink('example')

def test_warning_on_non_existant_path_DirectoryLink():
    """Calling _repr_html_ on non-existant files returns a warning"""
    dl = display.DirectoryLink('example')
    nt.assert_true(dl._repr_html_().startswith('Path (<tt>example</tt>)'))

def test_existing_path_DirectoryLink():
    """ Calling _repr_html_ functions as expected on existing directory """
    td = mkdtemp()
    dl = display.DirectoryLink(td)
    actual = dl._repr_html_()
    expected = "<a href='files/%s' target='_blank'>%s</a><br>" % (td,td)
    nt.assert_equal(actual,expected)