#!/usr/bin/env python
# vim: set sw=4 sts=4 et :
# Copyright: 2008-2009 Gentoo Foundation
# Author(s): Nirbheek Chauhan <nirbheek.chauhan@gmail.com>
# License: AGPL-3
#
# Immortal lh!
#

from __future__ import with_statement
import atexit, sys, os, shutil
import os.path as osp
try:
    from django.core import management
except ImportError:
    print "You need to install django-1.0 first."
    sys.exit(1)
else:
    if management.get_version() < '0.99':
        print "You need django-1.0 to use autotua-master."
        sys.exit(1)

STAGES      = ['install_master', 'syncdb_master', 'master_gpg',
               'setup_sample_slave', 'slave_gpg', 'setup_sample_job']
STAGE       = None
ACTION      = sys.argv[1]
PROJDIR     = 'autotua_master'
RELPROJPATH = sys.argv[2]
PROJPATH    = osp.abspath(sys.argv[2])
SYMLINKS    = True
SRCDIR      = osp.abspath(osp.dirname(sys.argv[0]))
DATAPATH    = osp.abspath(osp.join(SRCDIR, 'custom'))

def print_help():
    print \
    """\
%(file)s: Setup the django webapp for autotua
Usage:
    %(file)s install <where>
    <edit db settings>
    %(file)s syncdb <where>
    
Example:
    %(file)s install /home/me/projects/
will create `/home/me/projects/autotua_master` with all the necessary files.

You then need to edit the database settings in
    /home/me/projects/autotua_master/settings.py

After this, running
    %(file)s resume /home/me/projects/autotua_master
will initialize the db and do other magic

By default, the directory will have the files copied. 
Toggle `SYMLINKS` to symlink the files instead.
    """ % {'file': sys.argv[0]}

def save_current_stage():
    open(osp.join(PROJPATH, '.last_stage'), 'w').write(STAGE)

def next_stage():
    global STAGE
    next_stage_index = STAGES.index(STAGE)+1
    if next_stage_index < len(STAGES):
        STAGE = STAGES[next_stage_index]
    else:
        all_done()

def resume_last_stage():
    global STAGE
    stages = None
    if STAGE == STAGES[0]:
        stages = [STAGE]
    else:
        with open(osp.join(PROJPATH, '.last_stage'), 'r') as last_stage:
            STAGE = last_stage.read().rstrip('\n')
        # If we're at the last stage
        if STAGE == STAGES[-1]:
            all_done()
        stages = STAGES[STAGES.index(STAGE):]
    # For each stage since last_stage
    for stage in stages:
        eval('%s()' % stage)
        next_stage()

def install_master():
    """Start the new project"""
    import subprocess

    # Need to be in the project's parent dir
    os.chdir(osp.dirname(PROJPATH))
    print os.getcwd(), PROJPATH
    management.call_command('startproject', osp.basename(PROJPATH))
    if SYMLINKS:
        os.symlink(osp.join(SRCDIR, 'master'), osp.join(PROJPATH, 'master'))
        for file in ['urls.py']:
            dest_file = osp.join(PROJPATH, file)
            if osp.isfile(dest_file):
                os.remove(dest_file)
            os.symlink(osp.join(DATAPATH, file), dest_file)
    else:
        shutil.copytree(osp.join(SRCDIR, 'master'), osp.join(PROJPATH, 'master'))
        for file in ['urls.py']:
            shutil.copy(osp.join(DATAPATH, file), PROJPATH)
    settings = open(osp.join(PROJPATH, 'settings.py'), 'a')
    master_settings = open(osp.join(DATAPATH, 'merge_settings.py'))
    settings.write('\n'+master_settings.read())
    settings.close()
    master_settings.close()
    print """
===================================
Setup done.
Now you need to edit the database settings in %(dest)s/settings.py
and run `./setup-master.py resume %(dest)s`
===================================
""" % { 'dest': RELPROJPATH }

def syncdb_master():
    """Initialize the database"""
    import copy
    # Database defaults
    from db_defaults import groups, providers, archs, releases, mirrors

    # Django project settings
    import settings
    from django.core.management import setup_environ
    setup_environ(settings)
    from master.models import Group, Arch, Provider, Release, Mirror

    # Need to be in the project dir
    os.chdir(PROJPATH)
    management.call_command('syncdb')
    # User-related defaults
    for group in groups:
        Group(name=group).save()
    # Job-related defaults
    for (gen_arch, spec_archs) in archs.iteritems():
        gen_archobj = Arch(generic=gen_arch)
        for spec_arch in spec_archs:
            archobj = copy.copy(gen_archobj)
            archobj.specific = spec_arch
            archobj.save()
    # Populate providers
    for provider in providers:
        provobj = Provider(name=provider)
        provobj.save()
        # Populate release list
        releaseobj = Release(provider=provobj)
        for (release, relarchs) in releases[provider].iteritems():
            relobj = copy.copy(releaseobj)
            relobj.name = release
            relobj.save()
            for (relgen_arch, relspec_archs) in relarchs.iteritems():
                for relspec_arch in relspec_archs:
                    relobj.archs.add(Arch.objects.get(generic=relgen_arch,
                                                      specific=relspec_arch))
        # Populate mirror list
        obj = Mirror(owner=provobj)
        obj.structure = mirrors[provider]['structure']
        for server in mirrors[provider]['servers']:
            serverobj = copy.copy(obj)
            serverobj.server = server[0]
            serverobj.prefix = server[1]
            serverobj.save()

def setup_gpg(data, gpghome):
    from autotua import crypt
    if not osp.isdir(gpghome):
        os.mkdir(gpghome, 0700)
    print 'Creating a "sample" gpg key (expires in 1 month)'
    crypt.Crypto(gpghome).init_gpghome(**data)

def master_gpg():
    from master import const
    from sample_data import sample_master_gpg_data
    setup_gpg(sample_master_gpg_data, const.GPGHOME)

def slave_gpg():
    from master import const
    from sample_data import  sample_slave_gpg_data
    setup_gpg(sample_slave_gpg_data, osp.join(const.MASTER_DIR, 'sample_slave_gpghome'))

def setup_sample_slave():
    # Sample data for slave
    from sample_data import sample_slave

    # Django project settings
    import settings
    from django.core.management import setup_environ
    setup_environ(settings)
    from master import const
    from master.models import User, Group, Provider, Arch, Release, Mirror, Job, Slave

    # Need to be in the project dir
    os.chdir(PROJPATH)
    slave = Slave()
    slave.name = sample_slave['name']
    try:
        slave.owner = User.objects.get(username=sample_slave['owner']['username'])
    except User.DoesNotExist:
        slave.owner = User.objects.create_user(*[sample_slave['owner'][key]
                                               for key in ('username', 'email', 'password')])
        slave.owner.groups.add(Group.objects.get(name=sample_slave['owner']['group']))
    slave.save()
    slave.users = [Group.objects.get(name=group) for group in sample_slave['users']]
    slave.save()

def setup_sample_job():
    from autotua import sync
    # Sample data for master
    from sample_data import sample_job

    # Django project settings
    import settings
    from django.core.management import setup_environ
    setup_environ(settings)
    from master.models import User, Provider, Release, Job, Slave

    # Setup the jobtage tree in /var/tmp/autotua/jobtage
    sync.Syncer().sync()

    # Need to be in the project dir
    os.chdir(PROJPATH)
    # Get on with the job at hand... ;)
    job = Job()
    for i in ['name', 'jobtagerev', 'atoms']:
        setattr(job, i, sample_job[i])
    job.name = sample_job['name']
    job.maintainer = User.objects.get(username=sample_job['maintainer']['username'])
    job.release = Release.objects.get(name=sample_job['release'],
                                      provider=Provider.objects.get(name=sample_job['provider']))
    job.arch = job.release.archs.get(specific=sample_job['arch'])
    # If stage is not set, defaults to stage3
    job.save()
    job.slaves.add(Slave.objects.get(name=sample_job['slave']))
    job.save()

def all_done():
    print "All done! Now you can start the master with `python manage.py runserver`"
    sys.exit()

################
## Parse Args ##
################
if len(sys.argv) < 3:
    print "Insufficient arguments:"
    print_help()
    sys.exit(1)

if ACTION == 'install':
    PROJPATH = osp.join(PROJPATH, PROJDIR)
    STAGE = 'install_master'
    if not osp.isdir(osp.dirname(PROJPATH)):
        os.makedirs(osp.dirname(PROJPATH))
elif ACTION == 'path-install':
    STAGE = 'install_master'
    if not osp.isdir(osp.dirname(PROJPATH)):
        os.makedirs(osp.dirname(PROJPATH))
elif ACTION == 'resume':
    pass
else:
    print_help()
    sys.exit(1)

#######################
## Setup search path ##
#######################
# XXX: Document this in the help
if os.environ.has_key('PYTHONPATH'):
    sys.path.insert(0, os.environ['PYTHONPATH'])
# Remove current directory from search path
sys.path = sys.path[1:]
sys.path.append(SRCDIR)
sys.path.append(DATAPATH)
sys.path.append(PROJPATH)

####################
## Start our work ##
####################
atexit.register(save_current_stage)
resume_last_stage()