from zope.component import getMultiAdapter

from Products.CMFCore.utils import getToolByName
from Products.CMFCore.WorkflowTool import WorkflowTool as BaseTool
from Products.CMFPlone.interfaces import IWorkflowChain
from ZODB.POSException import ConflictError
from Acquisition import aq_base

from App.class_init import InitializeClass
from AccessControl import getSecurityManager, ClassSecurityInfo
from Products.CMFCore.permissions import ManagePortal
from Products.DCWorkflow.Transitions import TRIGGER_USER_ACTION
from Products.CMFPlone.PloneBaseTool import PloneBaseTool


class WorkflowTool(PloneBaseTool, BaseTool):

    meta_type = 'Plone Workflow Tool'
    security = ClassSecurityInfo()
    plone_tool = 1
    toolicon = 'skins/plone_images/workflow_icon.png'

    # TODO this should not make it into 1.0
    # Refactor me, my maker was tired
    def flattenTransitions(self, objs, container=None):
        """ this is really hokey - hold on!!"""
        if hasattr(objs, 'startswith'):
            return ()

        # TODO Need to behave differently for paths
        if len(objs) and '/' in objs[0]:
            return self.flattenTransitionsForPaths(objs)
        transitions=[]
        t_names=[]

        if container is None:
            container = self
        for o in [getattr(container, oid, None) for oid in objs]:
            trans=()
            try:
                trans=self.getTransitionsFor(o, container)
            except ConflictError:
                raise
            except:
                pass
            if trans:
                for t in trans:
                    if t['name'] not in t_names:
                        transitions.append(t)
                        t_names.append(t['name'])

        return tuple(transitions[:])


    def flattenTransitionsForPaths(self, paths):
        """ this is even more hokey!!"""
        if hasattr(paths, 'startswith'):
            return ()

        transitions=[]
        t_names=[]
        portal = getToolByName(self, 'portal_url').getPortalObject()

        for o in [portal.restrictedTraverse(path) for path in paths]:
            trans=()
            try:
                trans=self.getTransitionsFor(o, o.aq_inner.aq_parent)
            except ConflictError:
                raise
            except:
                pass
            if trans:
                for t in trans:
                    if t['name'] not in t_names:
                        transitions.append(t)
                        t_names.append(t['name'])

        return tuple(transitions[:])

    security.declarePublic('getTransitionsFor')
    def getTransitionsFor(self, obj=None, container=None, REQUEST=None):
        if type(obj) is type([]):
            return self.flattenTransitions(objs=obj, container=container)
        result = {}
        chain = self.getChainFor(obj)
        for wf_id in chain:
            wf = self.getWorkflowById(wf_id)
            if wf is not None:
                sdef = wf._getWorkflowStateOf(obj)
                if sdef is not None:
                    for tid in sdef.transitions:
                        tdef = wf.transitions.get(tid, None)
                        if tdef is not None and \
                           tdef.trigger_type == TRIGGER_USER_ACTION and \
                           tdef.actbox_name and \
                           wf._checkTransitionGuard(tdef, obj) and \
                           not tdef.id in result:
                            result[tdef.id] = {
                                    'id': tdef.id,
                                    'title': tdef.title,
                                    'title_or_id': tdef.title_or_id(),
                                    'description': tdef.description,
                                    'name': tdef.actbox_name,
                                    'url': tdef.actbox_url %
                                           {'content_url': obj.absolute_url(),
                                            'portal_url' : '',
                                            'folder_url' : ''}}
        return tuple(result.values())

    def workflows_in_use(self):
        """ gathers all the available workflow chains (sequence of workflow ids, ).  """
        in_use = []

        in_use.append( self._default_chain )

        if self._chains_by_type:
            for chain in self._chains_by_type.values():
                in_use.append(chain)

        return tuple(in_use[:])

    security.declarePublic('getWorklists')
    def getWorklists(self):
        """ instead of manually scraping actions_box, lets:
            query for all worklists in all workflow definitions.
            Returns a dictionary whos value is sequence of dictionaries

            i.e. map[workflow_id]=(workflow definition map, )
            each workflow defintion map contains the following:
            (worklist)id, guard (Guard instance), guard_permissions (permission of Guard instance),
            guard_roles (roles of Guard instance), catalog_vars (mapping), actbox_name (actions box label),
            actbox_url (actions box url) and types (list of portal types)
        """
        # We want to know which types use the workflows with worklists
        # This for example avoids displaying 'pending' of multiple workflows in the same worklist
        types_tool = getToolByName(self, 'portal_types')
        list_ptypes = types_tool.listContentTypes()
        types_by_wf = {} # wf:[list,of,types]
        for t in list_ptypes:
            for wf in self.getChainFor(t):
                types_by_wf[wf] = types_by_wf.get(wf,[]) + [t]

        # Placeful stuff
        placeful_tool = getToolByName(self, 'portal_placeful_workflow', None)
        if placeful_tool is not None:
            for policy in placeful_tool.getWorkflowPolicies():
                for t in list_ptypes:
                    chain = policy.getChainFor(t) or ()
                    for wf in chain:
                        types_by_wf[wf] = types_by_wf.get(wf,[]) + [t]

        wf_with_wlists = {}
        for id in self.getWorkflowIds():
            # the above list incomprehension merely _flattens_ nested sequences into 1 sequence

            wf=self.getWorkflowById(id)
            if hasattr(wf, 'worklists'):
                wlists = []
                for worklist in wf.worklists:
                    wlist_def=wf.worklists[worklist]
                    # Make the var_matches a dict instead of PersistentMapping to enable access from scripts
                    var_matches = {}
                    for key in wlist_def.var_matches.keys(): var_matches[key] = wlist_def.var_matches[key]
                    a_wlist = { 'id':worklist
                              , 'guard' : wlist_def.getGuard()
                              , 'guard_permissions' : wlist_def.getGuard().permissions
                              , 'guard_roles' : wlist_def.getGuard().roles
                              , 'catalog_vars' : var_matches
                              , 'name' : getattr(wlist_def, 'actbox_name', None)
                              , 'url' : getattr(wlist_def, 'actbox_url', None)
                              , 'types' : types_by_wf.get(id,[]) }
                    wlists.append(a_wlist)
                # yes, we can duplicates, we filter duplicates out on the calling PyhtonScript client
                wf_with_wlists[id]=wlists

        return wf_with_wlists

    security.declarePublic('getWorklistsResults')
    def getWorklistsResults(self):
        """Return all the objects concerned by one or more worklists

        This method replace 'getWorklists' by implementing the whole worklists
        work for the script.
        An object is returned only once, even if is return by several worklists.
        Make the whole work as expensive it is.
        """
        sm = getSecurityManager()
        # We want to know which types use the workflows with worklists
        # This for example avoids displaying 'pending' of multiple workflows in the same worklist
        types_tool = getToolByName(self, 'portal_types')
        catalog = getToolByName(self, 'portal_catalog')

        list_ptypes = types_tool.listContentTypes()
        types_by_wf = {} # wf:[list,of,types]
        for t in list_ptypes:
            for wf in self.getChainFor(t):
                types_by_wf[wf] = types_by_wf.get(wf, []) + [t]

        # PlacefulWorkflowTool will give us other results
        placeful_tool = getToolByName(self, 'portal_placeful_workflow', None)
        if placeful_tool is not None:
            for policy in placeful_tool.getWorkflowPolicies():
                for t in list_ptypes:
                    chain = policy.getChainFor(t) or ()
                    for wf in chain:
                        types_by_wf[wf] = types_by_wf.get(wf, []) + [t]

        objects_by_path = {}
        for id in self.getWorkflowIds():

            wf=self.getWorkflowById(id)
            if hasattr(wf, 'worklists'):
                for worklist in wf.worklists:
                    wlist_def=wf.worklists[worklist]
                    # Make the var_matches a dict instead of PersistentMapping to enable access from scripts
                    catalog_vars = dict(portal_type=types_by_wf.get(id, []))
                    for key in wlist_def.var_matches:
                        catalog_vars[key] = wlist_def.var_matches[key]
                    for result in catalog.searchResults(**catalog_vars):
                        o = result.getObject()
                        if o \
                           and id in self.getChainFor(o) \
                           and wlist_def.getGuard().check(sm, wf, o):
                            absurl = o.absolute_url()
                            if absurl:
                                objects_by_path[absurl] = (o.modified(), o)

        results = objects_by_path.values()
        results.sort()
        return tuple([ obj[1] for obj in results ])


    security.declareProtected(ManagePortal, 'getChainForPortalType')
    def getChainForPortalType(self, pt_name, managescreen=0):
        """ Get a chain for a specific portal type.
        """
        if pt_name in self._chains_by_type:
            return self._chains_by_type[pt_name]
        else:
            # (Default) is _not_ a chain nor a workflow in a chain.
            if managescreen:
                return '(Default)'
            else:
                # Return the default chain.
                return self._default_chain

    security.declareProtected(ManagePortal, 'listWorkflows')
    def listWorkflows(self):
        """ Return the list of workflows
        """
        return self.keys()

    security.declarePublic('getTitleForStateOnType')
    def getTitleForStateOnType(self, state_name, p_type):
        """Returns the workflow state title for a given state name,
           uses a portal_type to determine which workflow to use
        """
        if state_name and p_type is not None:
            chain = self.getChainForPortalType(p_type)
            for wf_id in chain:
                wf = self.getWorkflowById(wf_id)
                if wf is not None:
                    states = wf.states
                    state = getattr(states, state_name, None)
                    if state is not None:
                        return getattr(aq_base(state), 'title', None) or state_name
        return state_name

    security.declarePublic('getTitleForTransitionOnType')
    def getTitleForTransitionOnType(self, trans_name, p_type):
        """Returns the workflow transition title for a given transition name,
           uses a portal_type to determine which workflow to use
        """
        if trans_name and p_type is not None:
            chain = self.getChainForPortalType(p_type)
            for wf_id in chain:
                wf = self.getWorkflowById(wf_id)
                if wf is not None:
                    transitions = wf.transitions
                    trans = getattr(transitions, trans_name, None)
                    if trans is not None:
                        return getattr(aq_base(trans), 'actbox_name', None) or trans_name
        return trans_name

    security.declarePublic('listWFStatesByTitle')
    def listWFStatesByTitle(self, filter_similar=False):
        """Returns the states of all available workflows, optionally filtering
           out states with matching title and id"""
        states = []
        dup_list = {}
        for wf in self.values():
            state_folder = getattr(wf, 'states', None)
            if state_folder is not None:
                if not filter_similar:
                    states.extend(state_folder.values())
                else:
                    for state in state_folder.values():
                        key = '%s:%s'%(state.id,state.title)
                        if not key in dup_list:
                            states.append(state)
                        dup_list[key] = 1
        return [(s.title, s.getId()) for s in states]

    # PLIP 217 Workflow by adaptation
    def getChainFor( self, ob ):
        """
        Returns the chain that applies to the given object.
        If we get a string as the ob parameter, use it as
        the portal_type.
        """
        return getMultiAdapter( (ob, self), IWorkflowChain )

    security.declarePrivate('listActions')
    def listActions(self, info=None, object=None):

        """ Returns a list of actions to be displayed to the user.

        o Invoked by the portal_actions tool.

        o Allows workflows to include actions to be displayed in the
          actions box.

        o Object actions are supplied by workflows that apply to the object.
        """
        if object is not None or info is None:
            info = self._getOAI(object)
        chain = self.getChainFor(info.object)
        actions = []

        for wf_id in chain:
            wf = self.getWorkflowById(wf_id)
            if wf is not None:
                a = wf.listObjectActions(info)
                if a is not None:
                    actions.extend(a)
        return actions


WorkflowTool.__doc__ = BaseTool.__doc__

InitializeClass(WorkflowTool)
