# This program is free software; you can redistribute it and/or modify
# it under the terms of the (LGPL) GNU Lesser General Public License as
# published by the Free Software Foundation; either version 3 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 Library Lesser General Public License for more details at
# ( http://www.gnu.org/licenses/lgpl.html ).
#
# You should have received a copy of the GNU Lesser 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.
# written by: Jeff Ortel ( jortel@redhat.com )

"""
Provides appender classes for I{marshalling}.
"""

from logging import getLogger
from suds import null, tostr
from suds.mx import Content
from suds.sudsobject import footprint
from suds.sudsobject import Object, Property
from suds.sax.element import Element
from suds.sax.text import Text

log = getLogger(__name__)


class Matcher:
    """
    Appender matcher.
    @ivar cls: A class object.
    @type cls: I{classobj}
    """

    def __init__(self, cls):
        """
        @param cls: A class object.
        @type cls: I{classobj}
        """
        self.cls = cls

    def __eq__(self, x):
        if self.cls is None:
            return x is None
        else:
            return isinstance(x, self.cls)


class ContentAppender:
    """
    Appender used to add content to marshalled objects.
    @ivar default: The default appender.
    @type default: L{Appender}
    @ivar appenders: A I{table} of appenders mapped by class.
    @type appenders: I{table}
    """

    def __init__(self, marshaller):
        """
        @param marshaller: A marshaller.
        @type marshaller: L{suds.mx.core.Core}
        """
        self.default = PrimativeAppender(marshaller)
        self.appenders = (
            (Matcher(None),
                NoneAppender(marshaller)),
            (Matcher(null),
                NoneAppender(marshaller)),
            (Matcher(Property),
                PropertyAppender(marshaller)),
            (Matcher(Object),
                ObjectAppender(marshaller)),
            (Matcher(Element),
                ElementAppender(marshaller)),
            (Matcher(Text),
                TextAppender(marshaller)),
            (Matcher(list),
                ListAppender(marshaller)),
            (Matcher(tuple),
                ListAppender(marshaller)),
            (Matcher(dict),
                DictAppender(marshaller)),
        )

    def append(self, parent, content):
        """
        Select an appender and append the content to parent.
        @param parent: A parent node.
        @type parent: L{Element}
        @param content: The content to append.
        @type content: L{Content}
        """
        appender = self.default
        for a in self.appenders:
            if a[0] == content.value:
                appender = a[1]
                break
        appender.append(parent, content)


class Appender:
    """
    An appender used by the marshaller to append content.
    @ivar marshaller: A marshaller.
    @type marshaller: L{suds.mx.core.Core}
    """

    def __init__(self, marshaller):
        """
        @param marshaller: A marshaller.
        @type marshaller: L{suds.mx.core.Core}
        """
        self.marshaller = marshaller

    def node(self, content):
        """
        Create and return an XML node that is qualified
        using the I{type}.  Also, make sure all referenced namespace
        prefixes are declared.
        @param content: The content for which proccessing has ended.
        @type content: L{Object}
        @return: A new node.
        @rtype: L{Element}
        """
        return self.marshaller.node(content)

    def setnil(self, node, content):
        """
        Set the value of the I{node} to nill.
        @param node: A I{nil} node.
        @type node: L{Element}
        @param content: The content for which proccessing has ended.
        @type content: L{Object}
        """
        self.marshaller.setnil(node, content)

    def setdefault(self, node, content):
        """
        Set the value of the I{node} to a default value.
        @param node: A I{nil} node.
        @type node: L{Element}
        @param content: The content for which proccessing has ended.
        @type content: L{Object}
        @return: The default.
        """
        return self.marshaller.setdefault(node, content)

    def optional(self, content):
        """
        Get whether the specified content is optional.
        @param content: The content which to check.
        @type content: L{Content}
        """
        return self.marshaller.optional(content)

    def suspend(self, content):
        """
        Notify I{marshaller} that appending this content has suspended.
        @param content: The content for which proccessing has been suspended.
        @type content: L{Object}
        """
        self.marshaller.suspend(content)

    def resume(self, content):
        """
        Notify I{marshaller} that appending this content has resumed.
        @param content: The content for which proccessing has been resumed.
        @type content: L{Object}
        """
        self.marshaller.resume(content)

    def append(self, parent, content):
        """
        Append the specified L{content} to the I{parent}.
        @param content: The content to append.
        @type content: L{Object}
        """
        self.marshaller.append(parent, content)


class PrimativeAppender(Appender):
    """
    An appender for python I{primative} types.
    """

    def append(self, parent, content):
        if content.tag.startswith('_'):
            attr = content.tag[1:]
            value = tostr(content.value)
            if value:
                parent.set(attr, value)
        else:
            child = self.node(content)
            child.setText(tostr(content.value))
            parent.append(child)


class NoneAppender(Appender):
    """
    An appender for I{None} values.
    """

    def append(self, parent, content):
        child = self.node(content)
        default = self.setdefault(child, content)
        if default is None:
            self.setnil(child, content)
        parent.append(child)


class PropertyAppender(Appender):
    """
    A L{Property} appender.
    """

    def append(self, parent, content):
        p = content.value
        child = self.node(content)
        child.setText(p.get())
        parent.append(child)
        for item in p.items():
            cont = Content(tag=item[0], value=item[1])
            Appender.append(self, child, cont)


class ObjectAppender(Appender):
    """
    An L{Object} appender.
    """

    def append(self, parent, content):
        object = content.value
        if self.optional(content) and footprint(object) == 0:
            return
        child = self.node(content)
        parent.append(child)
        for item in object:
            cont = Content(tag=item[0], value=item[1])
            Appender.append(self, child, cont)


class DictAppender(Appender):
    """
    An python I{dict} appender.
    """

    def append(self, parent, content):
        d = content.value
        if self.optional(content) and len(d) == 0:
            return
        child = self.node(content)
        parent.append(child)
        for item in d.items():
            cont = Content(tag=item[0], value=item[1])
            Appender.append(self, child, cont)


class ElementWrapper(Element):
    """
    Element wrapper.
    """

    def __init__(self, content):
        Element.__init__(self, content.name, content.parent)
        self.__content = content

    def str(self, indent=0):
        return self.__content.str(indent)


class ElementAppender(Appender):
    """
    An appender for I{Element} types.
    """

    def append(self, parent, content):
        if content.tag.startswith('_'):
            raise Exception('raw XML not valid as attribute value')
        child = ElementWrapper(content.value)
        parent.append(child)


class ListAppender(Appender):
    """
    A list/tuple appender.
    """

    def append(self, parent, content):
        collection = content.value
        if len(collection):
            self.suspend(content)
            for item in collection:
                cont = Content(tag=content.tag, value=item)
                Appender.append(self, parent, cont)
            self.resume(content)


class TextAppender(Appender):
    """
    An appender for I{Text} values.
    """

    def append(self, parent, content):
        if content.tag.startswith('_'):
            attr = content.tag[1:]
            value = tostr(content.value)
            if value:
                parent.set(attr, value)
        else:
            child = self.node(content)
            child.setText(content.value)
            parent.append(child)