#!/usr/bin/env python
# Copyright 2017 Red Hat, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.

import logging
import signal
import sys

import zuul.cmd
import zuul.model
import zuul.web
import zuul.driver.sql
import zuul.driver.github

from zuul.lib.config import get_default


class WebServer(zuul.cmd.ZuulDaemonApp):
    app_name = 'web'
    app_description = 'A standalone Zuul web server.'

    def createParser(self):
        parser = super().createParser()
        parser.add_argument('command',
                            choices=zuul.web.COMMANDS,
                            nargs='?')
        return parser

    def parseArguments(self, args=None):
        super().parseArguments()
        if self.args.command:
            self.args.nodaemon = True

    def exit_handler(self, signum, frame):
        self.web.stop()

    def _run(self):
        info = zuul.model.WebInfo.fromConfig(self.config)

        params = dict()

        params['info'] = info
        params['listen_address'] = get_default(self.config,
                                               'web', 'listen_address',
                                               '127.0.0.1')
        params['listen_port'] = get_default(self.config, 'web', 'port', 9000)
        params['static_cache_expiry'] = get_default(self.config, 'web',
                                                    'static_cache_expiry',
                                                    3600)
        params['static_path'] = get_default(self.config,
                                            'web', 'static_path',
                                            None)
        params['gear_server'] = get_default(self.config, 'gearman', 'server')
        params['gear_port'] = get_default(self.config, 'gearman', 'port', 4730)
        params['ssl_key'] = get_default(self.config, 'gearman', 'ssl_key')
        params['ssl_cert'] = get_default(self.config, 'gearman', 'ssl_cert')
        params['ssl_ca'] = get_default(self.config, 'gearman', 'ssl_ca')

        params['command_socket'] = get_default(
            self.config, 'web', 'command_socket',
            '/var/lib/zuul/web.socket')

        params['connections'] = self.connections
        # Validate config here before we spin up the ZuulWeb object
        for conn_name, connection in self.connections.connections.items():
            try:
                connection.validateWebConfig(self.config, self.connections)
            except Exception:
                self.log.exception("Error validating config")
                sys.exit(1)

        params["zk_hosts"] = get_default(
            self.config, 'zookeeper', 'hosts', None)
        if not params["zk_hosts"]:
            raise Exception("The zookeeper hosts config value is required")

        try:
            self.web = zuul.web.ZuulWeb(**params)
        except Exception:
            self.log.exception("Error creating ZuulWeb:")
            sys.exit(1)

        signal.signal(signal.SIGUSR1, self.exit_handler)
        signal.signal(signal.SIGTERM, self.exit_handler)

        self.log.info('Zuul Web Server starting')
        self.web.start()

        try:
            signal.pause()
        except KeyboardInterrupt:
            print("Ctrl + C: asking web server to exit nicely...\n")
            self.exit_handler(signal.SIGINT, None)

        self.web.stop()
        self.log.info("Zuul Web Server stopped")

    def run(self):
        if self.args.command in zuul.web.COMMANDS:
            self.send_command(self.args.command)
            sys.exit(0)

        self.setup_logging('web', 'log_config')
        self.log = logging.getLogger("zuul.WebServer")

        try:
            self.configure_connections(
                include_drivers=[zuul.driver.sql.SQLDriver,
                                 zuul.driver.github.GithubDriver,
                                 zuul.driver.pagure.PagureDriver])
            self._run()
        except Exception:
            self.log.exception("Exception from WebServer:")


def main():
    WebServer().main()


if __name__ == "__main__":
    main()