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#
# Copyright The SCons Foundation
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"""Option type for list Variables.

This file defines the option type for SCons implementing 'lists'.

A 'list' option may either be 'all', 'none' or a list of names
separated by comma. After the option has been processed, the option
value holds either the named list elements, all list elements or no
list elements at all.

Usage example::

    list_of_libs = Split('x11 gl qt ical')

    opts = Variables()
    opts.Add(
        ListVariable(
            'shared',
            'libraries to build as shared libraries',
            'all',
            elems=list_of_libs,
        )
    )
    ...
    for lib in list_of_libs:
        if lib in env['shared']:
            env.SharedObject(...)
        else:
            env.Object(...)
"""

# Known Bug: This should behave like a Set-Type, but does not really,
# since elements can occur twice.

__all__ = ['ListVariable',]

import collections

import SCons.Util


class _ListVariable(collections.UserList):
    def __init__(self, initlist=[], allowedElems=[]):
        collections.UserList.__init__(self, [_f for _f in initlist if _f])
        self.allowedElems = sorted(allowedElems)

    def __cmp__(self, other):
        raise NotImplementedError
    def __eq__(self, other):
        raise NotImplementedError
    def __ge__(self, other):
        raise NotImplementedError
    def __gt__(self, other):
        raise NotImplementedError
    def __le__(self, other):
        raise NotImplementedError
    def __lt__(self, other):
        raise NotImplementedError
    def __str__(self):
        if len(self) == 0:
            return 'none'
        self.data.sort()
        if self.data == self.allowedElems:
            return 'all'
        else:
            return ','.join(self)
    def prepare_to_store(self):
        return self.__str__()

def _converter(val, allowedElems, mapdict):
    """
    """
    if val == 'none':
        val = []
    elif val == 'all':
        val = allowedElems
    else:
        val = [_f for _f in val.split(',') if _f]
        val = [mapdict.get(v, v) for v in val]
        notAllowed = [v for v in val if v not in allowedElems]
        if notAllowed:
            raise ValueError("Invalid value(s) for option: %s" %
                             ','.join(notAllowed))
    return _ListVariable(val, allowedElems)


## def _validator(key, val, env):
##     """
##     """
##     # todo: write validator for pgk list
##     return 1


def ListVariable(key, help, default, names, map={}):
    """
    The input parameters describe a 'package list' option, thus they
    are returned with the correct converter and validator appended. The
    result is usable for input to opts.Add() .

    A 'package list' option may either be 'all', 'none' or a list of
    package names (separated by space).
    """
    names_str = 'allowed names: %s' % ' '.join(names)
    if SCons.Util.is_List(default):
        default = ','.join(default)
    help = '\n    '.join(
        (help, '(all|none|comma-separated list of names)', names_str))
    return (key, help, default,
            None, #_validator,
            lambda val: _converter(val, names, map))

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