#!/usr/bin/env python

# vim: tabstop=4 shiftwidth=4 softtabstop=4

#    Copyright (C) 2012 Yahoo! Inc. All Rights Reserved.
#
#    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 sys
import time
import traceback

from devstack import colorlog
from devstack import date
from devstack import log as logging
from devstack import opts
from devstack import passwords
from devstack import settings
from devstack import shell as sh
from devstack import utils

from devstack.progs import actions
from devstack.progs import common

LOG = logging.getLogger("devstack.stack")

# This is used to map an action to a useful string for
# the welcome display
_WELCOME_MAP = {
    settings.INSTALL: "INSTALLER",
    settings.UNINSTALL: "UNINSTALLER",
    settings.START: "STARTER",
    settings.STOP: "STOPPER",
}


def dump_config(config_obj, password_generator):

    def item_format(key, value):
        return "\t%s=%s" % (str(key), str(value))

    def map_print(mp):
        for key in sorted(mp.keys()):
            value = mp.get(key)
            LOG.info(item_format(key, value))

    passwords_gotten = password_generator.accessed
    full_cfgs = config_obj.configs_fetched
    db_dsns = config_obj.db_dsns
    if passwords_gotten or full_cfgs or db_dsns:
        if passwords_gotten:
            LOG.info("Passwords:")
            map_print(passwords_gotten)
        if full_cfgs:
            filtered = dict((k, v) for (k, v) in full_cfgs.items() if k not in passwords_gotten)
            if filtered:
                LOG.info("Configs:")
                map_print(filtered)
        if db_dsns:
            LOG.info("Data source names:")
            map_print(db_dsns)


def run(args):
    (distro, platform) = utils.determine_distro()
    if distro is None:
        print("Unsupported platform " + utils.color_text(platform, "red") + "!")
        return False
    action = args.pop("action").strip().lower()
    if not (action in settings.ACTIONS):
        print(utils.color_text("No valid action specified!", "red"))
        return False
    rootdir = args.pop("dir")
    if not rootdir:
        print(utils.color_text("No root directory specified!", "red"))
        return False

    #welcome!
    (repeat_string, line_max_len) = utils.welcome(_WELCOME_MAP.get(action))
    print(utils.center_text("Action Runner", repeat_string, line_max_len))

    #here on out we should be using the logger (and not print)
    start_time = time.time()
    config = common.get_config()

    # Stash the dryrun value (if any) into the global configuration
    sh.set_dryrun(args['dryrun'])
    password_generator = passwords.PasswordGenerator(config, args['prompt_for_passwords'])
    pkg_manager = common.get_packager(distro, args['keep_old'])
    components = utils.parse_components(args.pop("components"))
    runner = actions.ActionRunner(distro, action, rootdir, config, password_generator,
                                  pkg_manager, components=components, **args)
    LOG.info("Starting action [%s] on %s for distro [%s]" % (action, date.rcf8222date(), distro))
    runner.run()
    LOG.info("It took (%s) to complete action [%s]" % (common.format_secs_taken((time.time() - start_time)), action))
    LOG.info("After action [%s] your settings which were created or read are:" % (action))
    dump_config(config, password_generator)
    return True


def configure_logging(args):

    # Debug by default
    root_logger = logging.getLogger().logger
    root_logger.setLevel(logging.DEBUG)

    # Set our pretty logger
    console_logger = logging.StreamHandler(stream=sys.stdout)
    console_format = '%(levelname)s: @%(name)s : %(message)s'
    if sh.in_terminal():
        console_logger.setFormatter(colorlog.TermFormatter(console_format))
    else:
        console_logger.setFormatter(logging.Formatter(console_format))
    root_logger.addHandler(console_logger)
        
    # Adjust logging verbose level based on the command line switch.
    log_level = logging.INFO
    if args['verbosity'] >= 2:
        log_level = logging.DEBUG
    elif args['dryrun']:
        log_level = logging.AUDIT
    root_logger.setLevel(log_level)


def main():

    #do this first so people can see the help message...
    args = opts.parse()
    prog_name = sys.argv[0]

    # Configure logging
    configure_logging(args)

    LOG.debug("Command line options %s" % (args))

    #will need root to setup openstack
    if not sh.got_root():
        rest_args = sys.argv[1:]
        print("This program requires a user with sudo access.")
        msg = "Perhaps you should try %s %s" % \
                (utils.color_text("sudo %s" % (prog_name), "red", True), " ".join(rest_args))
        print(msg)
        return 1

    try:
        #drop to usermode
        sh.user_mode(False)
        started_ok = run(args)
        if not started_ok:
            me = utils.color_text(prog_name, "red", True)
            me += " " + utils.color_text('--help', 'red')
            print("Perhaps you should try %s" % (me))
            return 1
        else:
            utils.goodbye(True)
            return 0
    except Exception:
        utils.goodbye(False)
        traceback.print_exc(file=sys.stdout)
        return 1


if __name__ == "__main__":
    sys.exit(main())