#!/usr/bin/env python3

# This file is part of Cockpit.
#
# Copyright (C) 2020 Red Hat, Inc.
#
# Cockpit is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
#
# Cockpit is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with Cockpit; If not, see <http://www.gnu.org/licenses/>.

import unittest
import subprocess
import os
import re

import parent  # noqa: F401
from testlib import (MachineCase, TEST_DIR, no_retry_when_changed, nondestructive,
                     skipDistroPackage, test_main)

dirname = os.path.dirname(__file__)
run_tests = os.path.join(TEST_DIR, "common", "run-tests")
VERIFY_DIR = os.path.join(TEST_DIR, "verify")
ROOT_DIR = os.path.dirname(TEST_DIR)


@skipDistroPackage()
class TestRunTestListing(unittest.TestCase):

    def testBasic(self):
        # Listing on check-* file
        self.assertEqual(subprocess.check_output([os.path.join(dirname, "check-example"), "-l", "TestNondestructiveExample"]).strip().decode(),
                         "TestNondestructiveExample.testOne\nTestNondestructiveExample.testTwo")
        # Filter on class
        p = subprocess.run([run_tests, "--test-dir", VERIFY_DIR, "-l", "TestNondestructiveExample"], capture_output=True, check=True)
        self.assertIn(b"TestNondestructiveExample.testOne\nTestNondestructiveExample.testTwo", p.stdout.strip())
        # Filter a specific test
        self.assertIn("TestNondestructiveExample.testOne",
                      subprocess.check_output([run_tests, "--test-dir", VERIFY_DIR, "-l", "TestNondestructiveExample.testOne"]).strip().decode())
        # Exclude test patterns
        out = subprocess.check_output([run_tests, "--test-dir", VERIFY_DIR, "-l",
                                       "--exclude", "bogus", "--exclude", "TestNondestructiveExample.testTwo",
                                       "TestNondestructiveExample"]).strip().decode()
        self.assertIn("TestNondestructiveExample.testOne", out)
        self.assertNotIn("testTwo", out)

        ndtests = subprocess.run([run_tests, "--test-dir", VERIFY_DIR, "-n", "-l"], check=True, capture_output=True)
        self.assertIn(b"TestExample.testNondestructive\n", ndtests.stdout)
        self.assertIn(b"TestNondestructiveExample.testOne\nTestNondestructiveExample.testTwo", ndtests.stdout)

        # nondestructive tests are sorted alphabetically
        self.assertRegex(ndtests.stdout, re.compile(b".*TestAccounts.*TestFirewall.*TestLogin.*TestServices.*TestTerminal.*", re.S))

    def testNonDestructive(self):
        self.assertEqual(subprocess.check_output([run_tests, "--test-dir", VERIFY_DIR, "--nondestructive", "-l", "TestExample"]).strip().decode(),
                         "TestExample.testNondestructive")

        # with short option and substring
        self.assertEqual(subprocess.check_output([run_tests, "--test-dir", VERIFY_DIR, "-nl", "TestExamp"]).strip().decode(),
                         "TestExample.testNondestructive")


# This can't be @nondestructive, as we run our own @nondestructive test nested inside this test. This will already call the
# cleanup handlers, and the outside cleanup would then fail to do that again.
@skipDistroPackage()
class TestRunTest(MachineCase):
    def testExistingMachine(self):
        env = os.environ.copy()
        try:
            del env["TEST_JOBS"]
        except KeyError:
            pass
        out = subprocess.check_output([run_tests, "--test-dir", VERIFY_DIR, "-vt",
                                       "--machine", self.machine.ssh_address + ":" + self.machine.ssh_port,
                                       "--browser", self.machine.web_address + ":" + self.machine.web_port,
                                       "TestNondestructiveExample"], env=env)
        self.assertRegex(out, b"\nok .* TestNondestructiveExample.testOne")
        self.assertRegex(out, b"\nok .* TestNondestructiveExample.testTwo")
        self.assertIn(b"TESTS PASSED", out)

        # can't be called with concurrency
        p = subprocess.Popen([run_tests, "--test-dir", VERIFY_DIR, "--machine", "1.2.3.4:56", "--browser", "1.2.3.4:67", "-j2"],
                             stdout=subprocess.DEVNULL, stderr=subprocess.PIPE)
        (out, err) = p.communicate()
        self.assertGreaterEqual(p.returncode, 1)
        self.assertIn(b"--machine cannot be used with concurrent jobs", err)

        # implies --nondestructive
        out = subprocess.check_output([run_tests, "--test-dir", VERIFY_DIR, "--machine", "1.2.3.4:56", "--browser", "1.2.3.4:67",
                                       "TestExample.testBasic"], env=env)
        self.assertIn(b"1..0", out)
        self.assertNotIn(b"TestExample", out)

    def testRetry(self):
        # Don't test this if not in git repo as we use `git diff` for this logic
        if not os.path.exists(os.path.join(ROOT_DIR, ".git")):
            return

        env = os.environ.copy()
        env["TEST_FAILURES"] = "1"
        # pretend this was a PR against main (set by CI normally, or by the user with --base)
        env["BASE_BRANCH"] = "main"
        try:
            del env["TEST_JOBS"]
        except KeyError:
            pass

        # Check that we retry 3 times failing tests
        process = subprocess.run([run_tests, "--test-dir", VERIFY_DIR, "TestExample.testFail", "TestExample.testSkip"],
                                 env=env, capture_output=True)
        stdout = process.stdout
        self.assertRegex(stdout, rb"\nnot ok 1 .*test\/verify\/check-example TestExample.testFail # RETRY 1 \(be robust against unstable tests\)\n")
        self.assertRegex(stdout, rb"\nnot ok 1 .*test\/verify\/check-example TestExample.testFail # RETRY 2 \(be robust against unstable tests\)\n")
        self.assertRegex(stdout, rb"\nnot ok 1 .*test\/verify\/check-example TestExample.testFail\n")
        self.assertNotRegex(stdout, b"RETRY 3")
        self.assertRegex(stdout, rb"\nok 2 .*test\/verify\/check-example TestExample.testSkip # SKIP testSkip \(__main__\.TestExample")
        self.assertRegex(stdout, rb"# 1 TESTS FAILED \[\d*s on .*, 2 parallel tests, 0 serial tests: \]")

        # Check retry logic for changed tests
        test_file = os.path.join(VERIFY_DIR, "check-testlib")
        with open(test_file, 'r') as f:
            original_test = f.read()

        def write_file(file, content, mode=0o666):
            # test files need to be executable, respect umask
            content_bin = content.encode()
            fd = os.open(file, os.O_CREAT | os.O_TRUNC | os.O_WRONLY, mode=mode)
            try:
                written = os.write(fd, content_bin)
                assert written == len(content_bin)
            finally:
                os.close(fd)

        self.addCleanup(write_file, test_file, original_test)
        write_file(test_file, original_test.replace("class NoTest", "class Test"))

        process = subprocess.run([run_tests, "--test-dir", VERIFY_DIR, "TestRetryExample.testFail", "TestRetryExample.testBasic",
                                  "TestRetryExample.testNoRetry"], env=env, capture_output=True)
        stdout = process.stdout

        # Changed test need to succeed 3 times
        self.assertRegex(stdout, rb"\nok 1 .*test\/verify\/check-testlib TestRetryExample.testBasic # RETRY 1 \(test affected tests 3 times\)\n")
        self.assertRegex(stdout, rb"\nok 1 .*test\/verify\/check-testlib TestRetryExample.testBasic # RETRY 2 \(test affected tests 3 times\)\n")
        self.assertRegex(stdout, rb"\nok 1 .*test\/verify\/check-testlib TestRetryExample.testBasic\n")
        self.assertNotRegex(stdout, b"RETRY 3")

        # Changed test is never retried
        self.assertRegex(stdout, rb"\nnot ok 2 .*test\/verify\/check-testlib TestRetryExample.testFail\n")
        self.assertNotRegex(stdout, b"testFail # RETRY")

        # Using @no_retry_when_changed prevents this retry logic
        self.assertRegex(stdout, rb"\nok 3 .*test\/verify\/check-testlib TestRetryExample.testNoRetry\n")
        self.assertNotRegex(stdout, b"testNoRetry # RETRY")

        # Check retry logic for changed source
        shell = os.path.join("pkg", "shell", "hosts.jsx")
        self.assertTrue(os.path.exists(shell))

        with open(shell, 'r') as f:
            original_source = f.read()

        self.addCleanup(write_file, shell, original_source)
        write_file(shell, original_source + "\n")

        # create affected test for shell changes
        with open(__file__) as f:
            original_test = f.read()
        affected_testfile = os.path.join(VERIFY_DIR, "check-shell-testlib")
        new_content = original_test.replace("class Test", "class NeinTest")
        write_file(affected_testfile, new_content.replace("class NeinTestRetryExample", "class TestShell"), mode=0o777)
        self.addCleanup(os.unlink, affected_testfile)

        process = subprocess.run([run_tests, "--test-dir", VERIFY_DIR,
                                  "TestShell.testBasic", "TestShell.testNoRetry"],
                                 env=env, capture_output=True)
        stdout = process.stdout
        self.assertRegex(stdout, rb"\nok .* TestShell.testBasic # RETRY 1 \(test affected tests 3 times\)\n")
        self.assertRegex(stdout, rb"\nok .* TestShell.testBasic # RETRY 2 \(test affected tests 3 times\)\n")
        self.assertRegex(stdout, rb"\nok .* TestShell.testBasic\n")
        self.assertNotRegex(stdout, b"RETRY 3")
        self.assertRegex(stdout, b"\nok .* TestShell.testNoRetry\n")
        self.assertNotRegex(stdout, b"TestShell.testNoRetry # RETRY")

        # Check that just .css changes do no affect retry logic
        systemd = os.path.join("pkg", "systemd", "overview.scss")
        self.assertTrue(os.path.exists(systemd))

        with open(systemd, 'r') as f:
            original_source = f.read()

        self.addCleanup(write_file, systemd, original_source)
        write_file(systemd, original_source + "\n")

        # create affected test for systemd changes
        affected_testfile = os.path.join(VERIFY_DIR, "check-system-testlib")
        write_file(affected_testfile, """#!/usr/bin/env python3
import unittest
class TestSystemd(unittest.TestCase):
    def testBasic(self):
        self.assertTrue(True)
        """, mode=0o777)
        self.addCleanup(os.unlink, affected_testfile)

        process = subprocess.run([run_tests, "--test-dir", VERIFY_DIR, "TestSystemd.testBasic"],
                                 env=env, capture_output=True)
        stdout = process.stdout
        self.assertRegex(stdout, rb"\nok .* TestSystemd.testBasic\n")
        self.assertNotRegex(stdout, b"RETRY")

    def testTodo(self):
        env = os.environ.copy()
        try:
            del env["TEST_JOBS"]
        except KeyError:
            pass
        env["TEST_TODO"] = "1"

        process = subprocess.run([run_tests, "--test-dir", VERIFY_DIR, "TestTodo"],
                                 env=env, capture_output=True)
        stdout = process.stdout

        expected_fails = 0

        # A @todo test which fails should write 'not ok ... # TODO ...'
        self.assertRegex(stdout, rb"\nnot ok . .*test/verify/check-example TestTodo.testTodoFail # TODO 2 is not yet sufficiently large\n")

        # A @todo test which passes should write 'not ok ... # expected failure ...' and hard fail
        self.assertRegex(stdout, rb"\nnot ok . .*test/verify/check-example TestTodo.testTodoPass # expected failure: 2 is not yet sufficiently large\n")
        expected_fails += 1

        # A @todo(flaky=True) test which fails writes 'not ok ... # TODO ...' just like flaky=False
        self.assertRegex(stdout, rb"\nnot ok . .*test/verify/check-example TestTodo.testTodoFailFlaky # TODO 2 is not yet sufficiently large\n")

        # But @todo(flaky=True) which passes writes 'ok ... # TODO ...' and isn't a hard fail
        self.assertRegex(stdout, rb"\nok . .*test/verify/check-example TestTodo.testTodoPassFlaky # TODO 2 is not yet sufficiently large\n")

        # There should have been 4 cases: pass/fail flaky and pass/fail non-flaky
        # The 'pass' non-flaky case results in a positive return code (expected_fails is 1)
        self.assertEqual(process.returncode, expected_fails)


@skipDistroPackage()
@nondestructive
class TestTestlib(MachineCase):
    def testRestoreAPI(self):
        m = self.machine

        self.assertEqual(m.execute("whoami").strip(), "root")
        # existing file
        m.execute("echo original > /etc/someconfig")
        self.restore_file("/etc/someconfig")
        m.execute("echo changed > /etc/someconfig")
        # nonexisting file
        self.restore_file("/var/lib/cockpittest.txt")
        m.execute("echo data > /var/lib/cockpittest.txt")

        # existing dir
        m.execute("mkdir -p /var/lib/existing_dir; echo hello > /var/lib/existing_dir/original")
        self.restore_dir("/var/lib/existing_dir")
        m.execute("rm /var/lib/existing_dir/original; echo pwned > /var/lib/existing_dir/new")
        # nonexisting dir
        self.restore_dir("/var/lib/cockpittestnew")
        m.execute("mkdir -p /var/lib/cockpittestnew; echo hello > /var/lib/cockpittestnew/cruft")

        # NSS is backed up by default
        m.execute("useradd cockpittest")

        # now pretend the test ends here
        self.doCleanups()

        # correctly restored existing file
        self.assertEqual("original", m.execute("cat /etc/someconfig").strip())
        m.execute("rm /etc/someconfig")
        # correctly cleaned up nonexisting file
        m.execute("test ! -e /var/lib/cockpittest.txt")

        # correctly restored existing dir
        self.assertEqual("original", m.execute("ls /var/lib/existing_dir").strip())
        self.assertEqual("hello\n", m.execute("cat /var/lib/existing_dir/original"))
        m.execute("rm -r /var/lib/existing_dir")
        # correctly removed nonexisting dir
        m.execute("test ! -e /var/lib/cockpittestnew")

        # NSS/home got restored
        self.assertNotIn("cockpittest", self.machine.execute("cat /etc/passwd"))
        self.machine.execute("test ! -e /home/cockpittest")

    def testMiscAPI(self):
        assert self.system_before(1000)
        assert not self.system_before(100)


@skipDistroPackage()
class NoTestRetryExample(unittest.TestCase):

    def testFail(self):
        if os.environ.get('TEST_FAILURES'):
            self.assertFalse(True)

    @no_retry_when_changed
    def testNoRetry(self):
        self.assertTrue(True)

    def testBasic(self):
        self.assertTrue(True)


if __name__ == '__main__':
    test_main()
