import argparse
import atexit
import os
import platform
import pytest
import re
import shutil
import signal
import stat
import subprocess
import sys
import tempfile
import time
from conftest import option, public_dir, waitforfiles, _check_alerts, _print_log
from multiprocessing import Process


class TestUnit():
    @classmethod
    def setup_class(cls, complete_check=True):
        cls.available = option.available
        unit = TestUnit()

        unit._run()

        # read unit.log

        for i in range(50):
            with open(unit.temp_dir + '/unit.log', 'r') as f:
                log = f.read()
                m = re.search('controller started', log)

                if m is None:
                    time.sleep(0.1)
                else:
                    break

        if m is None:
            _print_log(path=unit.temp_dir + '/unit.log')
            exit("Unit is writing log too long")

        def check(available, prerequisites):
            missed = []

            # check modules

            if 'modules' in prerequisites:
                available_modules = list(available['modules'].keys())

                for module in prerequisites['modules']:
                    if module in available_modules:
                        continue

                    missed.append(module)

            if missed:
                pytest.skip('Unit has no ' + ', '.join(missed) + ' module(s)')

            # check features

            if 'features' in prerequisites:
                available_features = list(available['features'].keys())

                for feature in prerequisites['features']:
                    if feature in available_features:
                        continue

                    missed.append(feature)

            if missed:
                pytest.skip(', '.join(missed) + ' feature(s) not supported')

        def destroy():
            unit.stop()
            _check_alerts(log)
            shutil.rmtree(unit.temp_dir)

        def complete():
            destroy()
            check(cls.available, cls.prerequisites)

        if complete_check:
            complete()
        else:
            unit.complete = complete
            return unit

    def setup_method(self):
        self._run()

    def _run(self):
        build_dir = option.current_dir + '/build'
        self.unitd = build_dir + '/unitd'

        if not os.path.isfile(self.unitd):
            exit("Could not find unit")

        self.temp_dir = tempfile.mkdtemp(prefix='unit-test-')

        public_dir(self.temp_dir)

        if oct(stat.S_IMODE(os.stat(build_dir).st_mode)) != '0o777':
            public_dir(build_dir)

        os.mkdir(self.temp_dir + '/state')

        with open(self.temp_dir + '/unit.log', 'w') as log:
            self._p = subprocess.Popen(
                [
                    self.unitd,
                    '--no-daemon',
                    '--modules',  build_dir,
                    '--state',    self.temp_dir + '/state',
                    '--pid',      self.temp_dir + '/unit.pid',
                    '--log',      self.temp_dir + '/unit.log',
                    '--control',  'unix:' + self.temp_dir + '/control.unit.sock',
                    '--tmp',      self.temp_dir,
                ],
                stderr=log,
            )

        atexit.register(self.stop)

        if not waitforfiles(self.temp_dir + '/control.unit.sock'):
            _print_log(path=self.temp_dir + '/unit.log')
            exit("Could not start unit")

        self._started = True

    def teardown_method(self):
        self.stop()

        # check unit.log for alerts

        unit_log = self.temp_dir + '/unit.log'

        with open(unit_log, 'r', encoding='utf-8', errors='ignore') as f:
            _check_alerts(f.read())

        # remove unit.log

        if not option.save_log:
            shutil.rmtree(self.temp_dir)
        else:
            _print_log(path=self.temp_dir)

        assert self.stop_errors == [None, None], 'stop errors'

    def stop(self):
        if not self._started:
            return

        self.stop_errors = []

        self.stop_errors.append(self._stop())

        self.stop_errors.append(self.stop_processes())

        atexit.unregister(self.stop)

        self._started = False

    def _stop(self):
        if self._p.poll() is not None:
            return

        with self._p as p:
            p.send_signal(signal.SIGQUIT)

            try:
                retcode = p.wait(15)
                if retcode:
                    return 'Child process terminated with code ' + str(retcode)
            except:
                p.kill()
                return 'Could not terminate unit'

    def run_process(self, target, *args):
        if not hasattr(self, '_processes'):
            self._processes = []

        process = Process(target=target, args=args)
        process.start()

        self._processes.append(process)

    def stop_processes(self):
        if not hasattr(self, '_processes'):
            return

        fail = False
        for process in self._processes:
            if process.is_alive():
                process.terminate()
                process.join(timeout=15)

                if process.is_alive():
                    fail = True

        if fail:
            return 'Fail to stop process'