#!/usr/bin/python2.6
# -*- coding: UTF-8 -*-
"""Creates an Atom-Feed for single or multiple winterrodeln sled reports.

Format:
    http://www.winterrodeln.org/feeds/berichte/alle
    http://www.winterrodeln.org/feeds/berichte/bahn/kemater_alm
    http://www.winterrodeln.org/feeds/berichte/bahnen/22+42+132 
See:
    http://www.atompub.org/
    http://effbot.org/zone/element.htm
    http://www.winterrodeln.org/trac/wiki/UrlSchema
"""
import sys
import datetime
from xml.etree.ElementTree import Element, SubElement, tostring

from sqlalchemy.engine import create_engine

import logging

from pylons import request, response, session, config, tmpl_context as c, url
from pylons.controllers.util import abort, redirect

from wrfeed.lib.base import BaseController, render

log = logging.getLogger(__name__)


def create_feed(page_title=None, page_ids=None):
    """If a page_title is given, only the reports for the given sled are shown.
    If a list of page_ids is given, only the reports for the selected pages are shown.
    Otherwise, all reports are shown."""

    engine = create_engine(config['sqlalchemy.url'])
    conn = engine.connect()

    select = "select id, page_title, date_report, date_entry, `condition`, description, author_name, author_username from wrreport "
    if not page_title is None:
        # page_title is given
        page_title = page_title.replace('_', ' ')
        sql = select + "where lcase(page_title) = lcase(%s) and date_invalid > now() and delete_date is null order by id desc limit 50"
        result = conn.execute(sql, page_title)
    elif not page_ids is None:
        # a list of page_ids is given
        sql = [select + "where "]
        if len(page_ids) > 0:
            sql += '('
            sql += " or ".join(['page_id=%s' for page_id in page_ids])
            sql += ') '
        sql += 'and date_invalid > now() and delete_date is null order by id desc limit 50'
        page_ids_str = [str(page_id) for page_id in page_ids]
        result = conn.execute("".join(sql), *page_ids_str)
    else:
        # user wants to have all reports
        sql = select + "where date_invalid > now() and delete_date is null order by id desc limit 50"
        result = conn.execute(sql)


    feed = Element("feed", xmlns="http://www.w3.org/2005/Atom")
    feed_title = SubElement(feed, "title")
    feed_title.text = "Winterrodeln Rodelbahnberichte"
    feed_id = SubElement(feed, "id")
    if not page_title is None:
        feed_id.text = url(controller='berichte', action='bahn', id=page_title)
    elif not page_ids is None:
        feed_id.text = url(controller='berichte', action='bahnen', id="+".join(page_ids_str))
    else:
        feed_id.text = url(controller='berichte', action='alle')
    feed_updated = SubElement(feed, "updated")
    feed.append(Element("link", rel="self", href=feed_id.text))

    last_updated = None
    for row in result:
        id, page_title, date_report, date_entry, condition, description, author_name, author_username = row
        page_title_url = page_title.replace(u' ', u'_')
        entry = SubElement(feed, "entry")
        entry_title = SubElement(entry, "title")
        entry_title.text = page_title
        entry.append(Element("link", rel="alternate", href=u"http://www.winterrodeln.org/wiki/{0}".format(page_title_url), type="text/html", hreflang="de"))
        entry_id = SubElement(entry, "id")
        entry_id.text = u"http://www.winterrodeln.org/feeds/schneelage/{0}/{1}".format(page_title_url, id)
        entry_updated = SubElement(entry, "updated")
        entry_updated.text = date_entry.isoformat() + "+01:00"
        if last_updated is None: last_updated = date_entry
        # entry_summary = SubElement(entry, "summary")
        # entry_summary.text = str(condition)
        entry_content = SubElement(entry, "content")
        entry_content.attrib["type"] = "xhtml"
        entry_content_div = SubElement(entry_content, "div")
        entry_content_div.attrib["xmlns"] = "http://www.w3.org/1999/xhtml"
        entry_content_ul = SubElement(entry_content_div, "ul")
        if not date_report is None:
            entry_content_date = SubElement(entry_content_ul, "li")
            entry_content_date.text = u"Bericht für " + date_report.isoformat()
        if not condition is None:
            entry_content_condition = SubElement(entry_content_ul, "li")
            entry_content_condition.text = u"Schneelage: " + {1: u'Sehr gut', 2: u'Gut', 3: u'Mittelmäßig', 4: u'Schlecht', 5: u'Geht nicht'}[condition]
        entry_content_description = SubElement(entry_content_ul, "li")
        entry_content_description.text = description
        entry_author = SubElement(entry, "author")
        entry_author_name = SubElement(entry_author, "name")
        if author_name is None: entry_author_name.text = "Anonymous user"
        else: entry_author_name.text = author_name

    if last_updated is None: last_updated = datetime.datetime.now()
    feed_updated.text = last_updated.isoformat() + "+01:00"

    feed_xml =  '<?xml version="1.0" encoding="utf-8"?>\n' + tostring(feed)
    conn.close()
    return feed_xml



class BerichteController(BaseController):

    def alle(self):
        """http://www.winterrodeln.org/feeds/berichte/alle"""
        response.content_type = 'application/atom+xml'
        return create_feed()


    def bahn(self, id):
        """http://www.winterrodeln.org/feeds/berichte/bahn/kemater_alm"""
        response.content_type = 'application/atom+xml'
        return create_feed(page_title=id)


    def bahnen(self, id):
        """http://www.winterrodeln.org/feeds/berichte/bahnen/22+42+132"""
        page_ids = id.split('+')
        page_ids = [int(page_id) for page_id in page_ids]
        response.content_type = 'application/atom+xml'
        return create_feed(page_ids=page_ids)