#!/usr/bin/env python
#
# Copyright (c) 2003 Richard Jones (richard@mechanicalcat.net)
#

import errno
import os
import shutil
import socket
import sys
import urlparse
import getopt

from roundup import configuration
from roundup.scripts import roundup_server

# Path where demo instance files will be stored
TRACKER_HOME = os.path.join(os.path.dirname(__file__), 'demo')

def install_demo(home, backend, template):
    """Install a demo tracker

    Parameters:
        home:
            tracker home directory path
        backend:
            database backend name
        template:
            tracker template

    """

    from roundup import init, instance, password, backends

    # set up the config for this tracker
    config = configuration.CoreConfig()
    config['TRACKER_HOME'] = home
    config['MAIL_DOMAIN'] = 'localhost'
    config['DATABASE'] = 'db'
    config['WEB_DEBUG'] = True
    if backend in ('mysql', 'postgresql'):
        config['RDBMS_HOST'] = 'localhost'
        config['RDBMS_USER'] = 'rounduptest'
        config['RDBMS_PASSWORD'] = 'rounduptest'
        config['RDBMS_NAME'] = 'rounduptest'

    # see if we need to clean up existing directory
    if os.path.exists(home):
        if os.path.exists(home + '/config.ini'):
            # clear everything out to avoid conflicts with former
            # extensions and detectors
            print "Nuking directory left from the previous demo instance."
            shutil.rmtree(home)
        else:
            print "Error: Refusing to nuke non-tracker directory:"
            print "    %s" % home
            sys.exit(1)

    template_dir = os.path.join('share', 'roundup', 'templates', template)
    init.install(home, template_dir)
    # don't have email flying around
    nosyreaction = os.path.join(home, 'detectors', 'nosyreaction.py')
    if os.path.exists(nosyreaction):
        os.remove(nosyreaction)
    nosyreaction += 'c'
    if os.path.exists(nosyreaction):
        os.remove(nosyreaction)
    init.write_select_db(home, backend)

    # figure basic params for server
    hostname = 'localhost'
    # pick a fairly odd, random port
    port = 8917
    while 1:
        print 'Trying to set up web server on port %d ...'%port,
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        try:
            s.connect((hostname, port))
        except socket.error, e:
            if not hasattr(e, 'args') or e.args[0] != errno.ECONNREFUSED:
                raise
            print 'should be ok.'
            break
        else:
            s.close()
            print 'already in use.'
            port += 100
    config['TRACKER_WEB'] = 'http://%s:%s/demo/'%(hostname, port)

    # write the config
    config['INSTANT_REGISTRATION'] = 1
    # FIXME: Move template-specific demo initialization into the templates.
    if template == 'responsive':
        config['STATIC_FILES'] = "static"
    config.save(os.path.join(home, config.INI_FILE))

    # open the tracker and initialise
    tracker = instance.open(home)
    tracker.init(password.Password('admin'))

    # add the "demo" user
    db = tracker.open('admin')
    # FIXME: Move tracker-specific demo initialization into the tracker templates.
    if template == 'minimal':
        db.user.create(username='demo', password=password.Password('demo'),
                       roles='User')
    else:
        db.user.create(username='demo', password=password.Password('demo'),
                       realname='Demo User', roles='User')
    db.commit()
    db.close()

def run_demo(home):
    """Run the demo tracker instance from its ``home`` directory"""
    cfg = configuration.CoreConfig(home)
    url = cfg["TRACKER_WEB"]
    hostname, port = urlparse.urlparse(url)[1].split(':')
    port = int(port)
    success_message = '''Server running - connect to:
    %(url)s
1. Log in as "demo"/"demo" or "admin"/"admin".
2. Hit Control-C to stop the server.
3. Re-start the server by running "%(script)s" again.
4. Re-initialise the server by running "%(script)s nuke".

Demo tracker is set up to be accessed by localhost browser.  If you
run demo on a server host, please stop the demo, open file
"%(datadir)s/config.ini" with your editor, change the host name in the "web"
option in section "[tracker]", save the file, then re-run the demo
program. If you want to change backend types, you must use "nuke".

''' % dict(url=url, script=sys.argv[0], datadir=TRACKER_HOME)

    # disable command line processing in roundup_server
    sys.argv = sys.argv[:1] + ['-p', str(port), 'demo=' + home]
    roundup_server.run(success_message=success_message)


def usage(msg = ''):

    if msg: print msg
    print 'Usage: %s [options] [nuke]'%sys.argv[0]
    print """
 Run a demo server. Config and database files are created
 in %(datadir)s/ subdirectory of %(script)s dir.
    
Options:
 -h                -- print this help message
 -t template       -- specify the tracker template to use
 -b backend        -- specify the database backend to use
""" % dict(script=sys.argv[0], datadir=TRACKER_HOME)


def main():
    """Run a demo server for users to play with for instant gratification.

    Sets up the web service on localhost. Disables nosy lists.
    """

    try:
        opts, args = getopt.getopt(sys.argv[1:], 't:b:h')
    except getopt.GetoptError, e:
        usage(str(e))
        return 1
    for opt, arg in opts:
        if opt == '-h':
            usage()
            return 0

    home = os.path.abspath(TRACKER_HOME)
    nuke = args and args[0] == 'nuke'
    if not os.path.exists(home) or nuke:
        backend = 'anydbm'
        template = 'classic'
        for opt, arg in opts:
            if opt == '-t':
                template = arg
            elif opt == '-b':
                backend = arg
        if (len(args) > 1 or
            (len(args) == 1 and args[0] != 'nuke')):
            usage()
            return 1

        print "Initializing demo instance in:\n    %s" % home
        install_demo(home, backend, template)
    elif opts:
        print "Error: Arguments are not allowed when running an existing demo."
        print "       Use the 'nuke' command to start over."
        sys.exit(1)

    run_demo(home)


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

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