#!/usr/bin/env python

import unittest
import os
from test import test_support
from tkinter import Tcl
from _tkinter import TclError

class TclTest(unittest.TestCase):

    def setUp(self):
        self.interp = Tcl()

    def testEval(self):
        tcl = self.interp
        tcl.eval('set a 1')
        self.assertEqual(tcl.eval('set a'),'1')

    def testEvalException(self):
        tcl = self.interp
        self.assertRaises(TclError,tcl.eval,'set a')

    def testEvalException2(self):
        tcl = self.interp
        self.assertRaises(TclError,tcl.eval,'this is wrong')

    def testCall(self):
        tcl = self.interp
        tcl.call('set','a','1')
        self.assertEqual(tcl.call('set','a'),'1')

    def testCallException(self):
        tcl = self.interp
        self.assertRaises(TclError,tcl.call,'set','a')

    def testCallException2(self):
        tcl = self.interp
        self.assertRaises(TclError,tcl.call,'this','is','wrong')

    def testSetVar(self):
        tcl = self.interp
        tcl.setvar('a','1')
        self.assertEqual(tcl.eval('set a'),'1')

    def testSetVarArray(self):
        tcl = self.interp
        tcl.setvar('a(1)','1')
        self.assertEqual(tcl.eval('set a(1)'),'1')

    def testGetVar(self):
        tcl = self.interp
        tcl.eval('set a 1')
        self.assertEqual(tcl.getvar('a'),'1')

    def testGetVarArray(self):
        tcl = self.interp
        tcl.eval('set a(1) 1')
        self.assertEqual(tcl.getvar('a(1)'),'1')

    def testGetVarException(self):
        tcl = self.interp
        self.assertRaises(TclError,tcl.getvar,'a')

    def testGetVarArrayException(self):
        tcl = self.interp
        self.assertRaises(TclError,tcl.getvar,'a(1)')

    def testUnsetVar(self):
        tcl = self.interp
        tcl.setvar('a',1)
        self.assertEqual(tcl.eval('info exists a'),'1')
        tcl.unsetvar('a')
        self.assertEqual(tcl.eval('info exists a'),'0')

    def testUnsetVarArray(self):
        tcl = self.interp
        tcl.setvar('a(1)',1)
        tcl.setvar('a(2)',2)
        self.assertEqual(tcl.eval('info exists a(1)'),'1')
        self.assertEqual(tcl.eval('info exists a(2)'),'1')
        tcl.unsetvar('a(1)')
        self.assertEqual(tcl.eval('info exists a(1)'),'0')
        self.assertEqual(tcl.eval('info exists a(2)'),'1')

    def testUnsetVarException(self):
        tcl = self.interp
        self.assertRaises(TclError,tcl.unsetvar,'a')

    def testEvalFile(self):
        tcl = self.interp
        filename = "testEvalFile.tcl"
        fd = open(filename,'w')
        script = """set a 1
        set b 2
        set c [ expr $a + $b ]
        """
        fd.write(script)
        fd.close()
        tcl.evalfile(filename)
        os.remove(filename)
        self.assertEqual(tcl.eval('set a'),'1')
        self.assertEqual(tcl.eval('set b'),'2')
        self.assertEqual(tcl.eval('set c'),'3')

    def testEvalFileException(self):
        tcl = self.interp
        filename = "doesnotexists"
        try:
            os.remove(filename)
        except Exception,e:
            pass
        self.assertRaises(TclError,tcl.evalfile,filename)

    def testPackageRequireException(self):
        tcl = self.interp
        self.assertRaises(TclError,tcl.eval,'package require DNE')

    def testLoadTk(self):
        import os
        if 'DISPLAY' not in os.environ:
            # skipping test of clean upgradeability
            return
        tcl = Tcl()
        self.assertRaises(TclError,tcl.winfo_geometry)
        tcl.loadtk()
        self.assertEqual('1x1+0+0', tcl.winfo_geometry())
        tcl.destroy()

    def testLoadTkFailure(self):
        import os
        old_display = None
        import sys
        if sys.platform.startswith(('win', 'darwin', 'cygwin')):
            return  # no failure possible on windows?
        if 'DISPLAY' in os.environ:
            old_display = os.environ['DISPLAY']
            del os.environ['DISPLAY']
            # on some platforms, deleting environment variables
            # doesn't actually carry through to the process level
            # because they don't support unsetenv
            # If that's the case, abort.
            display = os.popen('echo $DISPLAY').read().strip()
            if display:
                return
        try:
            tcl = Tcl()
            self.assertRaises(TclError, tcl.winfo_geometry)
            self.assertRaises(TclError, tcl.loadtk)
        finally:
            if old_display is not None:
                os.environ['DISPLAY'] = old_display

def test_main():
    test_support.run_unittest(TclTest)

if __name__ == "__main__":
    test_main()