"""Test textview, coverage 100%.

Since all methods and functions create (or destroy) a ViewWindow, which
is a widget containing a widget, etcetera, all tests must be gui tests.
Using mock Text would not change this.  Other mocks are used to retrieve
information about calls.
"""
from idlelib import textview as tv
import unittest
from test.support import requires
requires('gui')

import os
from tkinter import Tk
from tkinter.ttk import Button
from idlelib.idle_test.mock_idle import Func
from idlelib.idle_test.mock_tk import Mbox_func

def setUpModule():
    global root
    root = Tk()
    root.withdraw()

def tearDownModule():
    global root
    root.update_idletasks()
    root.destroy()
    del root

# If we call ViewWindow or wrapper functions with defaults
# modal=True, _utest=False, test hangs on call to wait_window.
# Have also gotten tk error 'can't invoke "event" command'.


class VW(tv.ViewWindow):  # Used in ViewWindowTest.
    transient = Func()
    grab_set = Func()
    wait_window = Func()


# Call wrapper class VW with mock wait_window.
class ViewWindowTest(unittest.TestCase):

    def setUp(self):
        VW.transient.__init__()
        VW.grab_set.__init__()
        VW.wait_window.__init__()

    def test_init_modal(self):
        view = VW(root, 'Title', 'test text')
        self.assertTrue(VW.transient.called)
        self.assertTrue(VW.grab_set.called)
        self.assertTrue(VW.wait_window.called)
        view.ok()

    def test_init_nonmodal(self):
        view = VW(root, 'Title', 'test text', modal=False)
        self.assertFalse(VW.transient.called)
        self.assertFalse(VW.grab_set.called)
        self.assertFalse(VW.wait_window.called)
        view.ok()

    def test_ok(self):
        view = VW(root, 'Title', 'test text', modal=False)
        view.destroy = Func()
        view.ok()
        self.assertTrue(view.destroy.called)
        del view.destroy  # Unmask real function.
        view.destroy()


class TextFrameTest(unittest.TestCase):

    @classmethod
    def setUpClass(cls):
        "By itself, this tests that file parsed without exception."
        cls.root = root = Tk()
        root.withdraw()
        cls.frame = tv.TextFrame(root, 'test text')

    @classmethod
    def tearDownClass(cls):
        del cls.frame
        cls.root.update_idletasks()
        cls.root.destroy()
        del cls.root

    def test_line1(self):
        get = self.frame.text.get
        self.assertEqual(get('1.0', '1.end'), 'test text')


# Call ViewWindow with modal=False.
class ViewFunctionTest(unittest.TestCase):

    @classmethod
    def setUpClass(cls):
        cls.orig_error = tv.showerror
        tv.showerror = Mbox_func()

    @classmethod
    def tearDownClass(cls):
        tv.showerror = cls.orig_error
        del cls.orig_error

    def test_view_text(self):
        view = tv.view_text(root, 'Title', 'test text', modal=False)
        self.assertIsInstance(view, tv.ViewWindow)
        self.assertIsInstance(view.viewframe, tv.ViewFrame)
        view.viewframe.ok()

    def test_view_file(self):
        view = tv.view_file(root, 'Title', __file__, 'ascii', modal=False)
        self.assertIsInstance(view, tv.ViewWindow)
        self.assertIsInstance(view.viewframe, tv.ViewFrame)
        get = view.viewframe.textframe.text.get
        self.assertIn('Test', get('1.0', '1.end'))
        view.ok()

    def test_bad_file(self):
        # Mock showerror will be used; view_file will return None.
        view = tv.view_file(root, 'Title', 'abc.xyz', 'ascii', modal=False)
        self.assertIsNone(view)
        self.assertEqual(tv.showerror.title, 'File Load Error')

    def test_bad_encoding(self):
        p = os.path
        fn = p.abspath(p.join(p.dirname(__file__), '..', 'CREDITS.txt'))
        tv.showerror.title = None
        view = tv.view_file(root, 'Title', fn, 'ascii', modal=False)
        self.assertIsNone(view)
        self.assertEqual(tv.showerror.title, 'Unicode Decode Error')


# Call ViewWindow with _utest=True.
class ButtonClickTest(unittest.TestCase):

    def setUp(self):
        self.view = None
        self.called = False

    def tearDown(self):
        if self.view:
            self.view.destroy()

    def test_view_text_bind_with_button(self):
        def _command():
            self.called = True
            self.view = tv.view_text(root, 'TITLE_TEXT', 'COMMAND', _utest=True)
        button = Button(root, text='BUTTON', command=_command)
        button.invoke()
        self.addCleanup(button.destroy)

        self.assertEqual(self.called, True)
        self.assertEqual(self.view.title(), 'TITLE_TEXT')
        self.assertEqual(self.view.viewframe.textframe.text.get('1.0', '1.end'),
                         'COMMAND')

    def test_view_file_bind_with_button(self):
        def _command():
            self.called = True
            self.view = tv.view_file(root, 'TITLE_FILE', __file__,
                                     encoding='ascii', _utest=True)
        button = Button(root, text='BUTTON', command=_command)
        button.invoke()
        self.addCleanup(button.destroy)

        self.assertEqual(self.called, True)
        self.assertEqual(self.view.title(), 'TITLE_FILE')
        get = self.view.viewframe.textframe.text.get
        with open(__file__) as f:
            self.assertEqual(get('1.0', '1.end'), f.readline().strip())
            f.readline()
            self.assertEqual(get('3.0', '3.end'), f.readline().strip())


if __name__ == '__main__':
    unittest.main(verbosity=2)