#!/usr/bin/python

#

# Apps.xhtml -- This module encapsulates XHTML output code needed by

# web applications.

#

# Copyright (C) 2011 The CentOS Project

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or (at

# your option) any later version.

#

# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

#

# ----------------------------------------------------------------------

# $Id$

# ----------------------------------------------------------------------

import os

import cgi

import cgitb; cgitb.enable()

class Page:

    def __init__(self):

        """Initialize page data."""

        self.qs = cgi.parse_qs(os.environ['QUERY_STRING'])

        self.name = 'Home'

        self.title = 'The CentOS Project'

        self.description = 'Community Enterprise Operating System'

        self.keywords = 'centos, project, community, enterprise, operating system'

        self.copyright = '2009-2011 The CentOS Project. All rights reserved.'

        self.language = 'en'

    def tag(self, name, attrs, indent=[8,1], content="", has_child=0):

        """Returns XHTML tag definition.

        Arguments:

        name: The XHTML tag's name. Notice that this function doesn't

            verify nor validate the XHTML tags you provide. It is up

            to you write them correctly considering the XHTML standard

            definition.

        attrs: The XHTML tag's attribute. Notice that this function

            doesn't verify the attributes assignation to tags. You

            need to know what attributes are considered valid to the

            tag you are creating in order to build a well-formed XHTML

            document. Such verification can be achived inside firefox

            browser through the `firebug' plugin.

        indent: The XHTML tag's indentation (Optional). This argument

            is a list of two numerical values. The first value in the

            list represents the amount of horizontal spaces between

            the beginning of line and the opening tag.  The second

            value in the list represents the amount of vertical spaces

            (new lines) between tags.

        content: The XHTML tag's content (Optional). This argument

            provides the information the tag encloses. When this

            argument is empty, tag is rendered without content.

        has_child: The XHTML tag has a child? (Optional). This

            argument is specifies whether a tag has another tag inside

            (1) or not (0).  When a tag has not a child tag,

            indentation is applied between the tag content and the

            closing tag provoking an unecessary spaces to be shown.

            Such kind of problems are prevented by setting this option

            to `0'. On the other hand, when a tag has a child tag

            inside, using the value `1' will keep the closing tag

            indentation aligned with the opening one.

        This function encapsulates the construction of XHTML tags.

        Use this function wherever you need to create XHTML tags. It

        helps to standardize tag constructions and their final output

        and, this way, produce consistent XHTML documents.

        """

        if indent[0] > 0:

            h_indent = ' '*indent[0]

        else:

            h_indent = ''

        if indent[1] > 0: 

            v_indent = "\n"*indent[1]

        else:

            v_indent = ''

        output = v_indent + h_indent + '<' + str(name)

        if len(attrs) > 0:

            attr_names = attrs.keys()

            attr_names.sort()

            for attr_name in attr_names:

                output += ' ' + str(attr_name) + '="' + str(attrs[attr_name]) + '"'

        if content == '':

            output += ' />'

        else:

            output += '>'

            output += str(content)

            if has_child == 1:

                output += h_indent + '</' + str(name) + '>'

            else:

                output += '</' + str(name) + '>'

        output += v_indent

        return output

    def page_preamble(self):

        """Return XHTML code of page preamble.

        The page preamble sets the document type definition required

        by the XHTML standard.

        """

        output = '' + "\n"

        output += '

        output += ' '*4 + 'PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"' + "\n"

        output += ' '*4 + '"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">' + "\n"

        return output

    def page_logo(self):

        """Returns XHTML code of page logo.

        The page logo is displayed on the top-left corner of the page.

        We use this area to show The CentOS Logo, the main visual

        representation of The CentOS Project. In order to print the

        page logo correctly, the image related must be 78 pixels of

        height.

        """

        attrs = []

        attrs.append({'id': 'logo'})

        attrs.append({'title': 'Community Enterprise Operating System', 'href': '/centos-web/'})

        attrs.append({'src': '/centos-web-pub/Images/centos-logo.png', 'alt': 'CentOS'})

        return self.tag('div', attrs[0], [8,1], self.tag('a', attrs[1], [12,1], self.tag('img', attrs[2], [0,0], '', 0), 0), 1)

    def page_ads_google(self):

        """Returns XHTML code of Google advertisement (468x60 pixels)."""

        output = """

            <script type="text/javascript">

                google_ad_client = "pub-6973128787810819";

                google_ad_width = 468;

                google_ad_height = 60;

                google_ad_format = "468x60_as";

                google_ad_type = "text_image";

                google_ad_channel = "";

                google_color_border = "204c8d";

                google_color_bg = "345c97";

                google_color_link = "0000FF";

                google_color_text = "FFFFFF";

                google_color_url = "008000";

                //-->

            </script>

                src="http://pagead2.googlesyndication.com/pagead/show_ads.js">

            </script>

        """

        return output

    def page_navibar_top(self):

        """Returns XHTML code of top-level navigation bar. 

        The top-level navigation bar organizes links to the web

        application The CentOS Project makes use of. Links in the

        top-level navigation bar remain always visible, no matter what

        web application you be visiting.

        Notice that web application differe one another and is not

        convenient to point them all to this definition. Instead, a

        specific definition for each web application will be created

        (based on this definition) in order for them to give the

        impression of being connected. In this process, the top-level

        navigation bar is adapted to each web application

        characteristics and the related tab is set as current.

        """

        names = ['Home', 'Wiki', 'Lists', 'Forums', 'Projects', 'Bugs', 'Docs', 'Downloads', 'Sponsors']

        attrs = []

        focus = self.name

        for i in range(len(names)):

            attrs.append({'href': '/centos-web/?app=' + names[i].lower()})

        tabs = self.page_navibar_tabs(names, attrs, focus)

        tabs += self.page_line()

        return tabs

    def page_navibar_tabs(self, names, attrs, focus=''):

        """Returns navigation tabs.

        Arguments:

        names: List of tab names.

        attrs: List of dictionaries for each tab name inside the

            `names' list. Dictionaries inside attrs argument contain

            the XHTML link attributes (e.g., accesskey, title, and

            href) used by tab names so they can be linkable once

            rendered.

        focus: Name of the tab marked as current. When no value is

            passed to this argument the `Home' value is used as

            default value.

        """

        navibar_tabs = ''

        for i in range(len(names)):

            content = self.tag('span', '', [0,0], str(names[i]))

            content = self.tag('a', attrs[i], [16,1], content)

            if str(names[i]).lower() == focus.lower():

                content = self.tag('span', {'class': 'current'}, [12,1], content, 1)

            else:

                content = self.tag('span', '', [12,1], content, 1)

            navibar_tabs += content

        return self.tag('div', {'class': 'tabs'}, [8,1], navibar_tabs, 1)

    def page_lastreleases(self, names=['6.0'], attrs=[{'href': '/centos-web/?p=releases&id=6.0'}]):

        """Returns last-release information and related RSS link."""

        releases = ''

        title = self.tag('a', {'href': '/centos-web/?p=releases'}, [0,0], 'Last Releases') + ':'

        title = self.tag('span', {'class': 'title'}, [16,1], title)

        for i in range(len(names)):

            link = self.tag('a', attrs[i], [20,1], names[i])

            if i == len(names) - 1:

                span = self.tag('span', {'class': 'last release'}, [16,1], link, 1) 

            else:

                span = self.tag('span', {'class': 'release'}, [16,1], link, 1) 

            releases += span

        releases = self.tag('div', {'class': 'left'}, [12,1], title + releases, 1)

        rsslink = self.tag('span', '', [0,0], 'RSS')

        rsslink = self.tag('a', {'href': '/centos-web/?print=rss', 'title': 'RSS'}, [20,1], rsslink)

        rsslink = self.tag('span', {'class': 'rss'}, [16,1], rsslink, 1)

        rsslink = self.tag('div', {'class': 'right'}, [12, 1], rsslink, 1)

        return self.tag('div', {'id': 'last-releases'}, [8,1], releases + rsslink, 1)

    def page_appslinks(self):

        """Returns application related links."""

        appslinks = self.page_userlinks()

        return self.tag('div', {'id': 'appslinks'}, [8,1], appslinks, 1)

    def page_lastvisit(self):

        last_visit = self.tag('a', '', [0,0], 'Your last visit was at')

        last_visit = self.tag('span', {'class': 'title'}, [16, 1], last_visit)

        last_visit += self.tag('span', {'class': 'datetime'}, [16, 1], '...')

        return self.tag('div', {'class': 'lastvisit'}, [12, 1], last_visit, 1)

    def page_session(self):

        """Returns information related to user's session."""

        names = []

        attrs = []

        session = ''

        names.append('Lost your password?')

        attrs.append({'href': '/centos-web/?p=lostpwd'})

        names.append('Register')

        attrs.append({'href': '/centos-web/?p=register'})

        names.append('Login')

        attrs.append({'href': '/centos-web/?p=login'})

        for i in range(len(names)):

            output = self.tag('a', attrs[i], [20,1], str(names[i]), 0)

            if i == len(names) - 1:

                output = self.tag('span', {'class': 'last'}, [16,1], output, 1)

            else:

                output = self.tag('span', '', [16,1], output, 1)

            session += output

        return self.tag('div', {'class': 'session'}, [12,1], session, 1)

    def page_trail(self, names=['None'], attrs=[{'href': '/centos-web/'}]):

        """Returns page trails (a.k.a. breadcrumbs).

        The page breadcrumbs record the last pages visited inside the

        current web application. Notice that page breadcrumbs are

        user-specific information, so it isn't possible to implement

        them until a way to manage user sessions be implemeneted

        inside `centos-web.cgi' script. Until then, keep the tag

        construction commented and return an empty value.

        """

        links = ''

        for i in range(len(names)):

            if i == len(names) - 1:

                content = self.tag('span', {'class':'last'}, [16,1], self.tag('a', attrs[i], [20, 1], names[i]), 1)

            else:

                content = self.tag('span', '', [16,1], self.tag('a', attrs[i], [20, 1], names[i], 0), 1)

            links = links + content

        return self.tag('div', {'class': 'trail'}, [12,1], links, 1)

    def page_userlinks(self):

        """Returns user links.

        Arguments:

        names: List of links you want to have.

        attrs: List of dictionaries with link attributes. In order for

            links to be built correctly, both names and attrs lists

            must coincide their indexes.

        The user links are specific to each web application. They are

        shown in the right-top corner of the application navigation

        bar, just over the application navigation tabs.

        """

        userlinks = self.page_lastvisit()

        userlinks += self.page_session()

        userlinks += self.page_trail()

        return self.tag('div', {'class': 'userlinks'}, [8,1], userlinks, 1)

    def page_navibar_app(self, names=['Welcome'], attrs=[{'href':'/centos-web/?p=welcome'}], focus='Welcome'):

        """Returns application's navigation bar."""

        navibar_app = self.page_navibar_tabs(names, attrs, focus)

        navibar_app += self.page_line({'class': 'page-line white'}, [8,1])

        return navibar_app

    def page_line(self, attrs={'class': 'page-line'}, indent=[8,1]):

        """Returns a division line."""

        page_line = self.tag('hr', {'style': 'display:none;'}, [0,0])

        page_line = self.tag('div', attrs, indent, page_line)

        return page_line

    def page_license(self):

        """Retruns link to page license."""

        license = 'Creative Commons Attribution-Share Alike 3.0 Unported License'

        license = self.tag('a', {'href': 'http://creativecommons.org/licenses/by-sa/3.0/'}, [0,0], license) + '.'

        return license

    def page_metadata(self):

        """Returns page metadata."""

        metadata = self.tag('meta', {'http-equiv': 'content-type', 'content': 'text/html; charset=UTF-8'}, [4,1])

        metadata += self.tag('meta', {'http-equiv': 'content-style-type', 'content': 'text/css'}, [4,0])

        metadata += self.tag('meta', {'http-equiv': 'content-language', 'content': str(self.language)}, [4,1])

        metadata += self.tag('meta', {'name': 'keywords', 'content': str(self.keywords)}, [4,0])

        metadata += self.tag('meta', {'name': 'description', 'content': str(self.description)}, [4,1])

        metadata += self.tag('meta', {'name': 'copyright', 'content': 'Copyright © ' + str(self.copyright)}, [4,0])

        metadata += self.tag('title', '', [4,1], self.title)

        metadata += self.tag('link', {'href': '/centos-web-pub/stylesheet.css','rel': 'stylesheet', 'type': 'text/css'}, [4,0])

        metadata += self.tag('link', {'href': '/centos-web-pub/Images/centos-fav.png', 'rel': 'shortcut icon', 'type': 'image/png'}, [4,1])

        return self.tag('head', '', [0,1], metadata)

    def page_content(self, content='Page empty.'):

        """Returns page content."""

        return content

    def page_credits(self):

        """Returns page credits."""

        copyright = self.tag('p', {'class': 'copyright'}, [12,1], 'Copyright © ' + str(self.copyright))

        license = self.tag('p', {'class': 'license'}, [12,1], 'This website is licensed under a ' + str(self.page_license()))

        credits = self.tag('img', {'src': '/centos-web-pub/Images/top.png', 'alt': 'Top'}, [0,0])

        credits = self.tag('a', {'title': 'Top', 'href': '#top'}, [16,1], credits)

        credits = self.tag('div', {'class': 'top'}, [12,1], credits, 1)

        credits = str(credits) + str(copyright) + str(license) 

        credits = self.tag('div', {'class': 'credits'}, [8,1], credits, 1)

        return credits

    def page(self):

        """Returns page final output."""

        page_header = self.page_logo()

        page_header += self.page_ads_google()

        page_header += self.page_navibar_top()

        page_header += self.page_lastreleases()

        page_header += self.page_appslinks()

        page_header += self.page_navibar_app()

        page_header = self.tag('div', {'id': 'page-header'}, [4,1], page_header, 1)

        page_body = self.page_content()

        page_body = self.tag('div', {'id':'content'}, [8,1], page_body, 1)

        page_body = self.tag('div', {'id':'page-body'}, [4,1], page_body, 1)

        page_footer = self.tag('div', {'id': 'page-footer'}, [4,1], self.page_credits(), 1)

        top = self.tag('a', {'name':'top'}, [0,1])

        wrap = self.tag('div', {'id': 'wrap'}, [0,1], page_header + page_body + page_footer, 1)

        body = self.tag('body', '', [0,1], top + wrap)

        html = self.page_preamble()

        html += self.tag('html', {'xmlns': 'http://www.w3.org/1999/xhtml', 'dir': 'ltr', 

                         'lang': str(self.language), 'xml:lang':

                         str(self.language)}, [0,1], self.page_metadata() +  body)

        return html

    def main(self):

        """The Xhtml code of a complete page."""

        print 'Content-type: text/html' + "\n"

        print self.page()