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"""Support module for page layout inside `Home' web application.

"""
from Apps import page

app = page.Layout()


def page_navibar_tabs():
    """Returns application main pages.
    
    The application main pages are organized as tabs in the
    application navigation bar. There is one tab for each main page
    inside the application.
    
    """
    names = ['Erratas', 'Articles', 'Events']
    attrs = []

    for i in names:
        attrs.append({'href': '/centos-web/?p=' + i.lower()})

    if 'p' in app.qs.keys():
        focus = app.qs['p'][0].lower()
    else:
        focus = names[0].lower()

    return app.navibar_app(names, attrs, focus)


def page_content():
    """Returns page content.
    
    The page content is determined from the query string, specifically
    from the value of `p' variable.
    
    """
    if 'p' in app.qs.keys():
        p = app.qs['p'][0].lower()
    else:
        p = 'erratas'

    if p == 'erratas':
        output = app.tag_h1({'class': 'title'}, [12, 1], 'Erratas' )
        output += app.tag_p({}, [12, 1], 'This is a paragraph. '*30 )
        output += app.tag_p({}, [12, 1], 'This is a paragraph in the sense of improvement. '*30 )
        output += app.tag_h2({'class': 'title'}, [12, 1], 'For A Better OS' )
        output += app.tag_p({}, [12, 1], 'This is a paragraph. '*30 )
        output += app.admonition('Caution', '', app.tag_p({}, [16, 1], 'This is a paragraph. '*5))
        output += app.tag_p({}, [12, 1], 'This is a paragraph. '*30 )
    elif p == 'articles':
        output = app.tag_h1({'class': 'title'}, [12, 1], 'Articles' )
    elif p == 'events':
        output = app.tag_h1({'class': 'title'}, [12, 1], 'Events' )
    else:
        output = app.tag_p('', [12, 1], 'Page Empty.')

    return app.content(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 = 'Home'

    # 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 += ' :: Home'

    # Define page header. This is the information displayed
    # between the page top and the page content.
    app.header = app.logo()
    app.header += app.ads_google()
    app.header += app.navibar_top()
    app.header += app.lastreleases()
    app.header += app.appslinks()
    app.header += page_navibar_tabs()

    # 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