import re
import grok
from grok import index
from zope.interface import Interface
from zope import schema
from z3c.widget.tiny.widget import TinyWidget
from zope.app.authentication import PluggableAuthentication
from zope.app.authentication.principalfolder import PrincipalFolder
from zope.app.authentication.principalfolder import InternalPrincipal
from zope.app.authentication.principalfolder import IInternalPrincipal
from zope.app.authentication.interfaces import IPasswordManager
from zope.app.authentication.session import SessionCredentialsPlugin
from zope.app.security.interfaces import IAuthentication
from zope.app.security.interfaces import IUnauthenticatedPrincipal
from zope.securitypolicy.interfaces import IPrincipalRoleManager
from zope.securitypolicy.interfaces import IRole
from zope.securitypolicy.interfaces import IRolePermissionManager
from zope.securitypolicy.role import LocalRole
from zope.i18n import MessageFactory
from zope.component import provideAdapter
from zope.component import getUtility
from zope.interface import implements
from zope.component import adapts
from zope.component import getUtility
from zope.component import getUtilitiesFor
from zope.annotation.interfaces import IAnnotations
from persistent.dict import PersistentDict
from zope.i18n import MessageFactory
import appconfig
from zope import component

expr = re.compile(r"^(w&.%#$&'*+-/=?^_`{}|~]+!)*[w&.%#$&'*+-/=?^_`{}|~]+"
                  r"@(([0-9a-z]([0-9a-z-]*[0-9a-z])?.)+[a-z]{2,6}|([0-9]{1,3}"
                  r".){3}[0-9]{1,3})$", re.IGNORECASE)
check_email = expr.match


##############################################################################
### I N T E R F A C E S ######################################################
##############################################################################

_ = MessageFactory('tpi')


################################################## email validation

class NotAnEmailAddress(schema.ValidationError):
    __doc__ = _(u"Invalid email address")

check_email = re.compile(r"[a-zA-Z0-9._%-]+@([a-zA-Z0-9-]+.)*[a-zA-Z]{2,4}").match
def valid_email(value):
    if check_email(value):
        return True
    raise NotAnEmailAddress(value)

################################################## interfaces


class IUser(Interface):
    """Basic user data."""
    login = schema.TextLine(title=_(u"Login"),
                            required=True)
    password = schema.Password(title=_(u"Password"),
                            required=True)
    password_repeat = schema.Password(title=_(u"Password repeat"),
                            required=True)
    fname = schema.TextLine(title=_(u"First name"),
                            required=False)
    lname = schema.TextLine(title=_(u"Last name"),
                            required=False)
    email = schema.ASCIILine(title=_(u"E-mail"),
                            required=False,
                            constraint=valid_email)

### H E L P E R   S C R I P T S  #############################################

def setup_pau(pau):
    pau['principals'] = PrincipalFolder('tpi.principals.')
    pau.authenticatorPlugins = ('principals',)
    pau['session'] = session = SessionCredentialsPlugin()
    session.loginpagename = 'login'
    pau.credentialsPlugins = ('No Challenge if Authenticated', 'session',)

def role_factory(*args):
    def factory():
        return LocalRole(*args)
    return factory

##############################################################################
### A P P L I C A T I O N ####################################################
##############################################################################

class Tpi(grok.Application, grok.Container):
    def __init__(self):
        super(Tpi, self).__init__()

    ### U T I L I T I E S  ###################################################

    # register authentication utility
    grok.local_utility(PluggableAuthentication, IAuthentication, 
                       setup=setup_pau)

    # register Admin Role  
    grok.local_utility(role_factory(u'TPI Administrator'), IRole,
                       name='tpi.Admin',
                       name_in_container='tpi.Admin')

    # register Employee Role  
    grok.local_utility(role_factory(u'TPI Employees'), IRole,
                       name='tpi.Employee',
                       name_in_container='tpi.Employees')

    # register Employee Role  
    grok.local_utility(role_factory(u'TPI Member'), IRole,
                       name='tpi.Member',
                       name_in_container='tpi.Member')

### S U B S C R I B E R S ####################################################

@grok.subscribe(Tpi, grok.IObjectAddedEvent)
def grant_permissions(app, event):
    role_manager = IRolePermissionManager(app)
    # Admin Permissions
    role_manager.grantPermissionToRole('tpi.ViewClients', 'tpi.Employees')
    role_manager.grantPermissionToRole('tpi.AddClient', 'tpi.Employees')
    role_manager.grantPermissionToRole('tpi.DeleteClient', 'tpi.Admin')
    role_manager.grantPermissionToRole('tpi.ViewMemberListing', 'tpi.Admin')
    # Employee Permissions
    role_manager.grantPermissionToRole('tpi.ViewClients', 'tpi.Employees')
    role_manager.grantPermissionToRole('tpi.AddClient', 'tpi.Employees')


class GlobalMacros(grok.View):
    grok.context(Interface)
    grok.name('globalmacros')

class Index(grok.View):
    grok.context(Tpi)
    grok.name('index')
    def navLIST(self, name):
        if name not in appconfig.menuitems.keys():
            pass
        else:
            return appconfig.menuitems[name]



##############################################################################
### A U T H E N T I C A T I O N ##############################################
##############################################################################

class Register(grok.Form):
    
    form_fields = grok.AutoFields(IUser)
    label = u'User registration'
    template = grok.PageTemplateFile('form.pt')

    @grok.action('Sign up')
    def save(self, login, password, password_repeat, fname, lname, email):
        # TODO: validate password is equal to password_repeat
        
        # add principal to principal folder
        pau = component.getUtility(IAuthentication)
        principals = pau['principals']
        assert(login not in principals)
        name = fname + ' ' + lname      
        principals[login] = user = InternalPrincipal(login, password, name)

        # save the email to an IUser instance
        user.email = email
        
        # grant principal the role
        role_manager = IPrincipalRoleManager(self.context)
        role_manager.assignRoleToPrincipal('tpi.Employee',
                                           principals.prefix + login)
        self.redirect('index')

class MemberListing(grok.Adapter):
    grok.implements(IUser)
    grok.template('form.pt')

    def fieldNames(self):
        return (f for f in IUser)

    def members(self):
        pau = component.getUtility(IAuthentication)
        principals = pau['principals']
        roster = [ ]
        for id in sorted(principals.keys()):
            print id
            print principals[id]
            user = IUser(principals[id])        # <----- this is where the code is breaking
            fields = {}
            for field in IUser:
                fields[field] = getattr(user, field)
            roster.append(fields)
        return roster