# Copyright (C) 2005-2009 Aaron Bentley and Panometrics, Inc.
#                         Chris Ball <cjb@laptop.org>
#                         Marien Zwart <marienz@gentoo.org>
#                         Thomas Gerigk <tgerigk@gmx.de>
#                         W. Trevor King <wking@drexel.edu>
#
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program; if not, write to the Free Software
#    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
"""Change tree settings"""
from libbe import cmdutil, bugdir, settings_object
__desc__ = __doc__

def _value_string(bd, setting):
    val = bd.settings.get(setting, settings_object.EMPTY)
    if val == settings_object.EMPTY:
        default = getattr(bd, bd._setting_name_to_attr_name(setting))
        if default not in [None, settings_object.EMPTY]:
            val = "None (%s)" % default
        else:
            val = None
    return str(val)

def execute(args, test=False):
    """
    >>> import os
    >>> bd = bugdir.simple_bug_dir()
    >>> os.chdir(bd.root)
    >>> execute(["target"], test=True)
    None
    >>> execute(["target", "tomorrow"], test=True)
    >>> execute(["target"], test=True)
    tomorrow
    >>> execute(["target", "none"], test=True)
    >>> execute(["target"], test=True)
    None
    """
    parser = get_parser()
    options, args = parser.parse_args(args)
    complete(options, args, parser)
    if len(args) > 2:
        raise cmdutil.UsageError, "Too many arguments"
    bd = bugdir.BugDir(from_disk=True, manipulate_encodings=not test)
    if len(args) == 0:
        keys = bd.settings_properties
        keys.sort()
        for key in keys:
            print "%16s: %s" % (key, _value_string(bd, key))
    elif len(args) == 1:
        print _value_string(bd, args[0])
    else:
        if args[1] != "none":
            if args[0] not in bd.settings_properties:
                msg = "Invalid setting %s\n" % args[0]
                msg += 'Allowed settings:\n  '
                msg += '\n  '.join(bd.settings_properties)
                raise cmdutil.UserError(msg)
            old_setting = bd.settings.get(args[0])
            setattr(bd, args[0], args[1])
        else:
            del bd.settings[args[0]]
        bd.save()

def get_parser():
    parser = cmdutil.CmdOptionParser("be set [NAME] [VALUE]")
    return parser

longhelp="""
Show or change per-tree settings. 

If name and value are supplied, the name is set to a new value.
If no value is specified, the current value is printed.
If no arguments are provided, all names and values are listed. 

Interesting settings are:
rcs_name
  The name of the revision control system.  "Arch" and "None" are supported.
target
  The current development goal 

To unset a setting, set it to "none".
"""

def help():
    return get_parser().help_str() + longhelp

def complete(options, args, parser):
    for option, value in cmdutil.option_value_pairs(options, parser):
        if value == "--complete":
            # no argument-options at the moment, so this is future-proofing
            raise cmdutil.GetCompletions()
    for pos,value in enumerate(args):
        if value == "--complete":
            if pos == 0: # first positional argument is a setting name
                props = bugdir.BugDir.settings_properties
                raise cmdutil.GetCompletions(props)
            raise cmdutil.GetCompletions() # no positional arguments for list