import confluent.exceptions as exc
import confluent.messages as msg
import confluent.config.attributes as allattributes

def retrieve(nodes, element, configmanager, inputdata):
    if nodes is not None:
        return retrieve_nodes(nodes, element, configmanager, inputdata)
    elif element[0] == 'nodegroup':
        return retrieve_nodegroup(element[1], element[3], configmanager, inputdata)


def retrieve_nodegroup(nodegroup, element, configmanager, inputdata):
    grpcfg = configmanager.get_nodegroup_attributes(nodegroup)
    if element == 'all':
        nodes = []
        if 'nodes' in grpcfg:
            nodes = list(grpcfg['nodes'])
        yield msg.ListAttributes(kv={'nodes': nodes},
                                 desc="The nodes belonging to this group")
        for attribute in sorted(allattributes.node.iterkeys()):
            if attribute == 'groups':
                continue
            if attribute in grpcfg:
                val = grpcfg[attribute]
            else:
                val = {'value': None}
            if attribute.startswith('secret.'):
                yield msg.CryptedAttributes(
                    kv={attribute: val},
                    desc=allattributes.node[attribute]['description'])
            elif isinstance(val, list):
                raise Exception("TODO")
            else:
                yield msg.Attributes(
                    kv={attribute: val['value']},
                    desc=allattributes.node[attribute]['description'])
    if element == 'current':
        for attribute in sorted(grpcfg.iterkeys()):
            currattr = grpcfg[attribute]
            desc=""
            if attribute == 'nodes':
                desc = 'The nodes belonging to this group'
            else:
                try:
                    desc = allattributes.node[attribute]['description']
                except KeyError:
                    desc = 'Unknown'
            if 'value' in currattr:
                yield msg.Attributes(
                    kv={attribute: currattr['value']},
                    desc=desc)
            elif 'cryptvalue' in currattr:
                yield msg.CryptedAttributes(
                    kv={attribute: currattr},
                    desc=desc)
            elif isinstance(currattr, set):
                yield msg.ListAttributes(
                    kv={attribute: list(currattr)},
                    desc=desc)
            elif isinstance(currattr, list):
                yield msg.ListAttributes(
                    kv={attribute: currattr},
                    desc=desc)
            else:
                raise Exception("BUGGY ATTRIBUTE FOR NODE")


def retrieve_nodes(nodes, element, configmanager, inputdata):
    attributes = configmanager.get_node_attributes(nodes)
    if element[-1] == 'all':
        for node in nodes:
            for attribute in sorted(allattributes.node.iterkeys()):
                if attribute in attributes[node]: #have a setting for it
                    val = attributes[node][attribute]
                elif attribute == 'groups': # no setting, provide a blank
                    val = []
                else: # no setting, provide a blank
                    val = {'value': None}
                if attribute.startswith('secret.'):
                    yield msg.CryptedAttributes(node,
                        {attribute: val},
                        allattributes.node[attribute]['description'])
                elif isinstance(val, list):
                    yield msg.ListAttributes(node,
                        {attribute: val},
                        allattributes.node[attribute]['description'])
                else:
                    yield msg.Attributes(node,
                        {attribute: val['value']},
                        allattributes.node[attribute]['description'])
    elif element[-1] == 'current':
        for node in attributes.iterkeys():
            for attribute in sorted(attributes[node].iterkeys()):
                currattr = attributes[node][attribute]
                try:
                    desc = allattributes.node[attribute]['description']
                except KeyError:
                    desc = 'Unknown'
                if 'value' in currattr:
                    yield msg.Attributes(node,
                        {attribute: currattr['value']},
                        desc)
                elif 'cryptvalue' in currattr:
                    yield msg.CryptedAttributes(node,
                        {attribute: currattr}, desc)
                elif isinstance(currattr, list):
                    yield msg.ListAttributes(node,
                        {attribute: currattr}, desc)
                else:
                    raise Exception("BUGGY ATTRIBUTE FOR NODE")


def update(nodes, element, configmanager, inputdata):
    if nodes is not None:
        return update_nodes(nodes, element, configmanager, inputdata)
    elif element[0] == 'nodegroup':
        return update_nodegroup(element[1], element[3], configmanager, inputdata)
    raise Exception("This line should never be reached")

def update_nodegroup(group, element, configmanager, inputdata):
    try:
        configmanager.set_group_attributes({group: inputdata.attribs})
    except ValueError:
        raise exc.InvalidArgumentException()
    return retrieve_nodegroup(group, element, configmanager, inputdata)
    
def update_nodes(nodes, element, configmanager, inputdata):
    updatedict = {}
    for node in nodes:
        updatenode = inputdata.get_attributes(node)
        if updatenode:
            updatedict[node] = updatenode
    try:
        configmanager.set_node_attributes(updatedict)
    except ValueError:
        raise exc.InvalidArgumentException()
    return retrieve(nodes, element, configmanager, inputdata)