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#  
#    http://www.apache.org/licenses/LICENSE-2.0
#    
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# App pages collection implementation
from util import *
from atomutil import *
from sys import debug

# Convert an id to a page id
def pageid(id):
    return ("apps", car(id), "htdocs", "app.html")

# Put a page into the page db
def put(id, page, user, cache, apps):
    debug('pages.py::put::id', id)
    debug('pages.py::put::page', page)

    # Get the requested app
    app = apps.get(id)
    if isNil(app):
        debug('pages.py::put', 'app not found', id)
        return False

    # Check app author
    if author(app) != user.get(()):
        debug('pages.py::put', 'different author', author(app))
        return False

    # Update the page in the page db
    pageentry = mkentry(title(app), car(id), user.get(()), now(), content(page))
    debug('pages.py::put::pageentry', pageentry)
    return cache.put(pageid(id), pageentry)

# Get a page from the page db
def get(id, user, cache, apps):
    debug('pages.py::get::id', id)
    if isNil(id):
        return (("'feed", ("'title", "Pages"), ("'id", "pages")),)

    # Get the requested app
    app = apps.get(id)
    if isNil(app):
        debug('pages.py::get', 'app not found', id)

        # Return a default new page
        return mkentry(car(id), car(id), user.get(()), now(), ())

    # Get the requested page
    page = cache.get(pageid(id))
    if isNil(page):
        debug('pages.py::get', 'page not found', id)

        # Return a default new page
        return mkentry(title(app), car(id), author(app), now(), ())

    # Return the page
    debug('pages.py::get::page', page)
    debug('pages.py::get::page::content', content(page))
    pageentry = mkentry(title(app), car(id), author(app), updated(page), content(page))
    debug('pages.py::get::pageentry', pageentry)
    return pageentry

# Delete a page from the page db
def delete(id, user, cache, apps):
    debug('pages.py::delete::id', id)

    # Get the requested app
    app = apps.get(id)
    if isNil(app):
        debug('pages.py::delete', 'app not found', id)
        return False

    # Check app author
    if author(app) != user.get(()):
        debug('pages.py::delete', 'different author', author(app))
        return False

    # Delete the page
    return cache.delete(pageid(id))