"""The `Unknown' web application.

The Unknown web application is automatically triggered when the page

requested is not defined as valid in `webenv.cgi' script. The

Unknown web application is basically an admonition message describing

the `page not found' issue and where to find the correct links to

start all over.

"""

from Apps import page

app = page.Layout()

def page_content():

    """Returns page content."""

    output = app.tag_p('', [16,1], 'The page you tried to open was not found in this server. Try one of the links above to start over.')

    output = app.admonition('Warning', 'Page not found.', output)

    output = app.tag_div({'id':'content-unknown'}, [8,1], output, 1)

    return output

def main():

    """Returns final output."""

    # Define page name. This value is used as reference to determine

    # which application to load and what tab in the navigation bar to

    # focus on.

    app.name = 'Unknown'

    # Define page title. This value is dislayed on the browser's title

    # bar. Notice that we concatenated the page class default value

    # here.

    app.title += ' :: Page not found'

    # Define page header. This is the information displayed

    # between the page top and the page content.

    app.header = app.logo()

    app.header += app.google_ad_example()

    app.header += app.navibar()

    # Define page body. This is the information displayed between the

    # page header and page footer.

    app.body = page_content()

    # Define page footer. This is the information displayed between

    # the page bottom and the page content, the last information

    # displayed in the page.

    app.footer = app.credits()

    # Define page final layout. 

    html = app.page()

    return html