##############################################################################
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# Zope Public License (ZPL) Version 1.0
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# This software consists of contributions made by Digital Creations and
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##############################################################################

import Acquisition
from ComputedAttribute import ComputedAttribute
from OFS.SimpleItem import Item
from Globals import Persistent, HTML, HTMLFile, ImageFile
from OFS.DTMLDocument import DTMLDocument
from OFS.PropertyManager import PropertyManager
import os.path
import string

class HelpTopicBase:
    "Mix-in Help Topic support class"

    _properties=(
        {'id':'title', 'type':'string', 'mode':'w'},
        {'id':'categories', 'type':'multiple selection',
         'select_variable':'categories_values', 'mode':'w'},
        {'id':'permissions', 'type':'multiple selection',
         'select_variable':'permissions_values', 'mode':'w'},
        )

    # default values
    categories=('Content Manager Information',)
    permissions=('View',)

    def _permissions_values(self):
        perms=[]
        for m in self.permission_settings():
            perms.append(m['name'])
        return perms
    
    permissions_values=ComputedAttribute(_permissions_values, 1)

    categories_values=(
        'Content Manager Information',
        'DTML Programmer Information',
        'Python Programmer Information',
        )

    def helpValues(self, REQUEST=None):
        return ()

    def authorized(self, user):
        "Is a given user authorized to view this Help Topic?"
        if not self.permissions:
            return 1
        for perm in self.permissions:
            if user.has_permission(perm, self):
                return 1
        return 0
    
    # Indexable methods
    # -----------------

    def SearchableText(self):
        "The full text of the Help Topic, for indexing purposes"
        raise "Unimplemented"

    def url(self):
        "URL for indexing purposes"
        return string.join(self.getPhysicalPath(), '/')

    # Private indexing methods
    # ------------------------
    
    def manage_afterAdd(self, item, container):
        self.index_object()

    def manage_afterClone(self, item):
        self.index_object()

    def manage_beforeDelete(self, item, container):
        self.unindex_object()

    def _setPropValue(self, id, value):
        setattr(self,id,value)
        self.reindex_object()

    def index_object(self, prefix=''):
        self.get_catalog().catalog_object(self, prefix + self.url())

    def unindex_object(self, prefix=''):
        self.get_catalog().uncatalog_object(prefix + self.url())

    def reindex_object(self):
        self.unindex_object()
        self.index_object()

    def get_catalog(self):
        return self.catalog


class HelpTopic(Acquisition.Implicit, HelpTopicBase, Item, PropertyManager, Persistent):
    """
    Abstract base class for Help Topics
    """
    
    meta_type='Help Topic'
    icon='p_/HelpTopic_icon'

    manage_options=(
        {'label':'Properties', 'action':'manage_propertiesForm'},
        {'label':'View', 'action':'index_html'},
        )

    __ac_permissions__=(
        ('View', ('index_html', 'SearchableText', 'url')),
        ('Access contents information', ('helpValues',)),
        )

    def index_html(self, REQUEST, RESPONSE):
        "View the Help Topic"
        raise "Unimplemented"


class DTMLDocumentTopic(HelpTopicBase, DTMLDocument):
    """
    A user addable Help Topic based on DTML Document.
    """
    meta_type='Help Topic'
    icon='p_/HelpTopic_icon'

    def munge(self,*args, **kw):
        apply(DTMLDocument.munge, (self,) + args, kw)
        self.reindex_object()

    def SearchableText(self):
        return '%s %s' % (self.title, self.read())
   

default_topic_content="""\
<dtml-var standard_html_header>
<h2><dtml-var title></h2>
<p>This is the <dtml-var id> Help Topic.</p>
<dtml-var standard_html_footer>
"""

class DTMLTopic(HelpTopic):
    """
    A basic Help Topic. Holds a HTMLFile object.
    """
    def __init__(self, id, title, file, permissions=None, categories=None):
        self.id=id
        self.title=title
        file,ext=os.path.splitext(file)
        prefix,file=os.path.split(file)
        self.index_html=HTMLFile(file,prefix)
        if permissions is not None:
            self.permissions=permissions
        if categories is not None:
            self.categories=categories
        
    def SearchableText(self):
        "The full text of the Help Topic, for indexing purposes"
        return '%s %s' % (self.title, self.index_html.read())

        
class TextTopic(HelpTopic):
    """
    A basic Help Topic. Holds a text file.
    """
    def __init__(self, id, title, file, permissions=None, categories=None):
        self.id=id
        self.title=title
        self.obj=open(file).read()
        if permissions is not None:
            self.permissions=permissions
        if categories is not None:
            self.categories=categories
        
    def index_html(self, REQUEST=None):
        "View the Help Topic"
        return self.obj

    def SearchableText(self):
        "The full text of the Help Topic, for indexing purposes"
        return '%s %s' % (self.title, self.obj)

    
class STXTopic(TextTopic):
    """
    A structured-text topic. Holds a HTMLFile object.
    """
    
    index_html=HTML("""\
<dtml-var standard_html_header>
<dtml-var obj fmt="structured-text">
<dtml-var standard_html_footer>""")


class ImageTopic(HelpTopic):
    """
    A image Help Topic. Holds an ImageFile object.
    """

    meta_type='Help Image'

    def __init__(self, id, title, file, categories=None, permissions=None):
        self.id=id
        self.title=title
        dir, file=os.path.split(file)
        self.image=ImageFile(file, dir)
        if permissions is not None:
            self.permissions=permissions
        if categories is not None:
            self.categories=categories  
    
    def index_html(self, REQUEST, RESPONSE):
        "View the Help Topic"
        return self.image.index_html(REQUEST, RESPONSE)
        
    def SearchableText(self):
        "The full text of the Help Topic, for indexing purposes"
        return ''
        
