# Tests command line execution of scripts
from __future__ import with_statement

import unittest
import os
import os.path
import sys
import test.test_support
import tempfile
import subprocess
import py_compile
import contextlib
import shutil
import zipfile

verbose = test.test_support.verbose

# XXX ncoghlan: Should we consider moving these to test_support?
from test.test_cmd_line import _spawn_python, _kill_python

def _run_python(*args):
    if __debug__:
        p = _spawn_python(*args)
    else:
        p = _spawn_python('-O', *args)
    stdout_data = _kill_python(p)
    return p.wait(), stdout_data.decode()

@contextlib.contextmanager
def temp_dir():
    dirname = tempfile.mkdtemp()
    dirname = os.path.realpath(dirname)
    try:
        yield dirname
    finally:
        shutil.rmtree(dirname)

test_source = ("""\
# Script may be run with optimisation enabled, so don't rely on assert
# statements being executed
def assertEqual(lhs, rhs):
    if lhs != rhs:
        raise AssertionError("%r != %r" % (lhs, rhs))
def assertIdentical(lhs, rhs):
    if lhs is not rhs:
        raise AssertionError("%r is not %r" % (lhs, rhs))
# Check basic code execution
result = ['Top level assignment']
def f():
    result.append('Lower level reference')
f()
assertEqual(result, ['Top level assignment', 'Lower level reference'])
# Check population of magic variables
assertEqual(__name__, '__main__')
print('__file__==%r' % __file__)
# Check the sys module
import sys
assertIdentical(globals(), sys.modules[__name__].__dict__)
print('sys.argv[0]==%r' % sys.argv[0])
""")

def _make_test_script(script_dir, script_basename):
    script_filename = script_basename+os.path.extsep+"py"
    script_name = os.path.join(script_dir, script_filename)
    script_file = open(script_name, "w")
    script_file.write(test_source)
    script_file.close()
    return script_name

def _compile_test_script(script_name):
    py_compile.compile(script_name, doraise=True)
    if __debug__:
        compiled_name = script_name + 'c'
    else:
        compiled_name = script_name + 'o'
    return compiled_name

def _make_test_zip(zip_dir, zip_basename, script_name):
    zip_filename = zip_basename+os.path.extsep+"zip"
    zip_name = os.path.join(zip_dir, zip_filename)
    zip_file = zipfile.ZipFile(zip_name, 'w')
    zip_file.write(script_name, os.path.basename(script_name))
    zip_file.close()
    # if verbose:
    #    zip_file = zipfile.ZipFile(zip_name, 'r')
    #    print("Contents of %r:" % zip_name)
    #    zip_file.printdir()
    #    zip_file.close()
    return zip_name

class CmdLineTest(unittest.TestCase):
    def _check_script(self, script_name, expected_file, expected_argv0):
        exit_code, data = _run_python(script_name)
        if verbose:
            print("Output from test script %r:" % script_name)
            print(data)
        self.assertEqual(exit_code, 0, data)
        printed_file = '__file__==%r' % expected_file
        printed_argv0 = 'sys.argv[0]==%r' % expected_argv0
        self.assert_(printed_file in data, (printed_file, data))
        self.assert_(printed_argv0 in data, (printed_argv0, data))

    def test_basic_script(self):
        with temp_dir() as script_dir:
            script_name = _make_test_script(script_dir, "script")
            self._check_script(script_name, script_name, script_name)

    def test_script_compiled(self):
        with temp_dir() as script_dir:
            script_name = _make_test_script(script_dir, "script")
            compiled_name = _compile_test_script(script_name)
            os.remove(script_name)
            self._check_script(compiled_name, compiled_name, compiled_name)

    def test_directory(self):
        with temp_dir() as script_dir:
            script_name = _make_test_script(script_dir, "__main__")
            self._check_script(script_dir, script_name, script_dir)

    def test_directory_compiled(self):
        with temp_dir() as script_dir:
            script_name = _make_test_script(script_dir, "__main__")
            compiled_name = _compile_test_script(script_name)
            os.remove(script_name)
            self._check_script(script_dir, compiled_name, script_dir)

    def test_zipfile(self):
        with temp_dir() as script_dir:
            script_name = _make_test_script(script_dir, "__main__")
            zip_name = _make_test_zip(script_dir, "test_zip", script_name)
            self._check_script(zip_name, None, zip_name)

    def test_zipfile_compiled(self):
        with temp_dir() as script_dir:
            script_name = _make_test_script(script_dir, "__main__")
            compiled_name = _compile_test_script(script_name)
            zip_name = _make_test_zip(script_dir, "test_zip", compiled_name)
            self._check_script(zip_name, None, zip_name)


def test_main():
    test.test_support.run_unittest(CmdLineTest)
    test.test_support.reap_children()

if __name__ == "__main__":
    test_main()