import os
import shutil
import logging
import errno
import sys

import wizard
from wizard import command, deploy, shell, util

def main(argv, baton):
    options, args = parse_args(argv)
    # XXX: do something smart if -scripts is not at the end
    dir = args[0]
    if os.path.exists(dir):
        raise DirectoryExistsError
    appname, _, version = options.app.partition('-')
    app = deploy.applications()[appname]
    sh = shell.Shell()
    sh.call("git", "clone", "--shared", app.repository, dir)
    with util.ChangeDirectory(dir):
        if version:
            sh.call("git", "checkout", options.app)
        # this command's stdin should be hooked up to ours
        try:
            sh.call("wizard", "configure", *args[1:], interactive=True)
        except shell.PythonCallError:
            sys.exit(1)

def parse_args(argv):
    usage = """usage: %prog install [--app APP] [DIR -- [SETUPARGS]]

Autoinstalls an application."""
    parser = command.WizardOptionParser(usage)
    parser.add_option("--app", dest="app",
            help="Application to install, optionally specifying a version as APP-VERSION")
    options, args = parser.parse_all(argv)
    if not args:
        # XXX: in the future, not specifying stuff is supported, since
        # we'll prompt for it interactively
        parser.error("must specify application")
    return options, args

class DirectoryExistsError(wizard.Error):
    def __str__(self):
        return "Directory already exists"