#!/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 cfg_helpers
from devstack import date
from devstack import env
from devstack import env_rc
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",
}

_CFG_GROUPS = {
    cfg_helpers.make_id('passwords', None): 'Passwords',
    cfg_helpers.make_id('db', None): 'Database info',
    #catch all
    cfg_helpers.make_id(None, None): 'Misc configs',
}

_CFG_ORDERING = sorted(_CFG_GROUPS.keys())
_CFG_ORDERING.reverse()


def dump_config(config_cache):

    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))

    #first partition into our groups
    partitions = dict()
    for name in _CFG_ORDERING:
        partitions[name] = dict()

    #now put the config cached values into there partition
    for (k, v) in config_cache.items():
        for name in _CFG_ORDERING:
            entries = partitions[name]
            if k.startswith(name):
                entries[k] = v
                break

    #now print them..
    for name in _CFG_ORDERING:
        nice_name = _CFG_GROUPS.get(name)
        LOG.info(nice_name + ":")
        entries = partitions.get(name)
        if entries:
            map_print(entries)


def load_rc_files():
    fns = [settings.OSRC_FN]
    for fn in fns:
        try:
            LOG.debug("Attempting to load rc file at [%s] which has your environment settings." % (fn))
            am_loaded = env_rc.RcReader().load(fn)
            LOG.debug("Loaded [%s] settings from rc file [%s]" % (am_loaded, fn))
        except IOError:
            LOG.warn('Error reading rc file located at [%s]. Skipping loading it.' % (fn))
    return len(fns)


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

    loaded_rcs = False
    rootdir = args.pop("dir")
    if not rootdir:
        load_rc_files()
        loaded_rcs = True
        rootdir = env.get_key(env_rc.INSTALL_ROOT)
        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()

    # if we didn't load them before, load them now
    if not loaded_rcs:
        load_rc_files()
        loaded_rcs = True

    # Stash the dryrun value (if any) into the global configuration
    sh.set_dryrun(args['dryrun'])

    config = common.get_config()
    pw_gen = 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, pw_gen,
                                  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.configs_fetched)
    return True


def main():

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

    # Configure logging
    utils.configure_logging(args['verbosity'], args['dryrun'])

    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())