from xml.dom import minidom

from zope.interface import classProvides, implements, providedBy
from zope.component import getUtilitiesFor, queryMultiAdapter, getUtility, \
    getMultiAdapter, adapts
from zope.component.interfaces import IFactory
from zope.app.container.interfaces import INameChooser

from plone.portlets.interfaces import ILocalPortletAssignable, IPortletManager,\
    IPortletAssignmentMapping, IPortletAssignment
from plone.portlets.constants import CONTEXT_CATEGORY
from plone.app.portlets.interfaces import IPortletTypeInterface
from plone.app.portlets.exportimport.interfaces import IPortletAssignmentExportImportHandler
from plone.app.portlets.exportimport.portlets import PropertyPortletAssignmentExportImportHandler
from plone.app.portlets.interfaces import IPortletTypeInterface

from collective.transmogrifier.interfaces import ISection, ISectionBlueprint
from collective.transmogrifier.utils import defaultMatcher

class PortletsExporterSection(object):
    classProvides(ISectionBlueprint)
    implements(ISection)

    def __init__(self, transmogrifier, name, options, previous):
        self.previous = previous
        self.context = transmogrifier.context

        self.pathkey = defaultMatcher(options, 'path-key', name, 'path')
        self.fileskey = options.get('files-key', '_files').strip()

        self.doc = minidom.Document()

    def __iter__(self):
        self.portlet_schemata = dict([(iface, name,) for name, iface in 
            getUtilitiesFor(IPortletTypeInterface)])
        self.portlet_managers = getUtilitiesFor(IPortletManager)

        for item in self.previous:
            pathkey = self.pathkey(*item.keys())[0]

            if not pathkey:
                yield item; continue

            path = item[pathkey]
            obj = self.context.unrestrictedTraverse(path, None)
            if obj is None:         # path doesn't exist
                yield item; continue

            if ILocalPortletAssignable.providedBy(obj):
                data = None

                root = self.doc.createElement('portlets')
                for elem in self.exportAssignments(obj):
                    root.appendChild(elem)
                #for elem in self.exportBlacklists(obj)
                    #root.appendChild(elem)
                if root.hasChildNodes():
                    self.doc.appendChild(root)
                    data = self.doc.toprettyxml(indent='  ', encoding='utf-8')
                    self.doc.unlink()

                if data:
                    files = item.setdefault(self.fileskey, {})
                    item[self.fileskey]['portlets'] = {
                        'name': '.portlets.xml',
                        'data': data,
                    }
            yield item

    def exportAssignments(self, obj):
        assignments = []
        for manager_name, manager in self.portlet_managers:
            mapping = queryMultiAdapter((obj, manager), IPortletAssignmentMapping)
            mapping = mapping.__of__(obj)

            for name, assignment in mapping.items():
                type_ = None
                for schema in providedBy(assignment).flattened():
                    type_ = self.portlet_schemata.get(schema, None)
                    if type_ is not None:
                        break

                if type_ is not None:
                    child = self.doc.createElement('assignment')
                    child.setAttribute('manager', manager_name)
                    child.setAttribute('category', CONTEXT_CATEGORY)
                    child.setAttribute('key', '/'.join(obj.getPhysicalPath()))
                    child.setAttribute('type', type_)
                    child.setAttribute('name', name)

                    assignment = assignment.__of__(mapping)
                    # use existing adapter for exporting a portlet assignment
                    handler = IPortletAssignmentExportImportHandler(assignment)
                    handler.export_assignment(schema, self.doc, child)

                    assignments.append(child)

        return assignments

class PortletsImporterSection(object):
    classProvides(ISectionBlueprint)
    implements(ISection)

    def __init__(self, transmogrifier, name, options, previous):
        self.previous = previous
        self.context = transmogrifier.context

        self.pathkey = defaultMatcher(options, 'path-key', name, 'path')
        self.fileskey = defaultMatcher(options, 'files-key', name, 'files')

    def __iter__(self):

        for item in self.previous:
            pathkey = self.pathkey(*item.keys())[0]
            fileskey = self.fileskey(*item.keys())[0]

            if not (pathkey and fileskey):
                yield item; continue
            if 'portlets' not in item[fileskey]:
                yield item; continue

            path = item[pathkey]
            obj = self.context.unrestrictedTraverse(path, None)
            if obj is None:         # path doesn't exist
                yield item; continue

            if ILocalPortletAssignable.providedBy(obj):
                data = None
                data = item[fileskey]['portlets']['data']
                doc = minidom.parseString(data)
                root = doc.documentElement
                for elem in root.childNodes:
                    if elem.nodeName == 'assignment':
                        self.importAssignment(obj, elem)
                    #elif elem.nodeName == 'blacklist':
                        #self.importBlacklist(obj, elem)

            yield item

    def importAssignment(self, obj, node):
        """ Import an assignment from a node
        """
        # 1. Determine the assignment mapping and the name
        manager_name = node.getAttribute('manager')
        category = node.getAttribute('category')

        manager = getUtility(IPortletManager, manager_name)
        mapping = getMultiAdapter((obj, manager), IPortletAssignmentMapping)

        # 2. Either find or create the assignment
        assignment = None
        name = node.getAttribute('name')
        if name:
            assignment = mapping.get(name, None)

        type_ = node.getAttribute('type')

        if assignment is None:
            portlet_factory = getUtility(IFactory, name=type_)
            assignment = portlet_factory()

            if not name:
                chooser = INameChooser(mapping)
                name = chooser.chooseName(None, assignment)

            mapping[name] = assignment

        # aq-wrap it so that complex fields will work
        assignment = assignment.__of__(obj)

        # 3. Use an adapter to update the portlet settings
        portlet_interface = getUtility(IPortletTypeInterface, name=type_)
        assignment_handler = IPortletAssignmentExportImportHandler(assignment)
        assignment_handler.import_assignment(portlet_interface, node)

class PortletAssignmentExportImportHandler(PropertyPortletAssignmentExportImportHandler):
    """ This adapter is needed because original fails to handle text from 
        pretty printed XML file.
    """
    adapts(IPortletAssignment)

    def extract_text(self, node):
        text = super(PortletAssignmentExportImportHandler, self).extract_text(node)
        # strip text to remove newlines and space character from the beginning 
        # and the end
        return text.strip()