'''Test idlelib.textview.

Since all methods and functions create (or destroy) a TextViewer, which
is a widget containing multiple widgets, all tests must be gui tests.
Using mock Text would not change this.  Other mocks are used to retrieve
information about calls.

The coverage is essentially 100%.
'''
from idlelib import textview as tv
from test.support import requires
requires('gui')

import unittest
import os
from tkinter import Tk
from idlelib.idle_test.mock_idle import Func
from idlelib.idle_test.mock_tk import Mbox

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

def tearDownModule():
    global root, TV
    del TV
    root.update_idletasks()
    root.destroy()  # pyflakes falsely sees root as undefined
    del root


class TV(tv.TextViewer):  # used by TextViewTest
    transient = Func()
    grab_set = Func()
    wait_window = Func()

class TextViewTest(unittest.TestCase):

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

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

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

    def test_ok(self):
        view = TV(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 textviewTest(unittest.TestCase):

    @classmethod
    def setUpClass(cls):
        cls.orig_mbox = tv.tkMessageBox
        tv.tkMessageBox = Mbox

    @classmethod
    def tearDownClass(cls):
        tv.tkMessageBox = cls.orig_mbox
        del cls.orig_mbox

    def test_view_text(self):
        # If modal True, tkinter will error with 'can't invoke "event" command'
        view = tv.view_text(root, 'Title', 'test text', modal=False)
        self.assertIsInstance(view, tv.TextViewer)

    def test_view_file(self):
        test_dir = os.path.dirname(__file__)
        testfile = os.path.join(test_dir, 'test_textview.py')
        view = tv.view_file(root, 'Title', testfile, modal=False)
        self.assertIsInstance(view, tv.TextViewer)
        self.assertIn('Test', view.textView.get('1.0', '1.end'))
        view.Ok()

        # Mock messagebox will be used and view_file will not return anything
        testfile = os.path.join(test_dir, '../notthere.py')
        view = tv.view_file(root, 'Title', testfile, modal=False)
        self.assertIsNone(view)


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