#!/usr/bin/env python
#
# get_weather.py - v0.1
#
# Copyright (c) 2008 - Rich Burridge - Sun Microsystems Inc.
# All Rights Reserved.
#
# Uses BeautifulSoup.py from http://www.crummy.com/software/BeautifulSoup/
#
# Usage:
#
# $ python ./get_weather.py
#
# Script to get the 10 day weather forecast for the given zip code by 
# using BeautifulSoup to scrape the weather.com web page, then send email.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published
# by the Free Software Foundation; either version 2, 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
# Lesser General Public License for more details.

import smtplib
import sys
import urllib2
from BeautifulSoup import BeautifulSoup

# -------- START OF USER CONFIGURATION SECTION --------
 
# Zip code to get 10 day forecast for.
#
zipCode = "94024"

# Email address to sent results to.
#
emailAddr = "someone@somewhere.com"

# -------- END OF USER CONFIGURATION SECTION --------

# Base URL the weather.com weather forecast.
#
url = "http://www.weather.com/weather/tenday/" + zipCode + \
      "?from=36hr_fcst10DayLink_undeclared"

# Email message template.
#
messageTemplate = """\
From: %s
To: %s
Subject: %s

%s
"""

def sendEmail(results):
    SERVER = "localhost"
    FROM = emailAddr
    TO = [ emailAddr ]
    SUBJECT = "10 day Forecast For Zip: %s." % zipCode

    TEXT = ""
    for result in results:
        TEXT += "%s\n" % '   '.join(result)

    message = messageTemplate % (FROM, ", ".join(TO), SUBJECT, TEXT)
    server = smtplib.SMTP(SERVER)
    #sys.stderr.write("message: `%s`\n" % message)
    server.sendmail(FROM, TO, message)
    server.quit()

def extractForecast(soup):
    tdDates = soup.findAll("div", { "class" : "tdDate" })
    tdForecasts = soup.findAll("div", { "class" : "tdForecast" })
    tdTemps = soup.findAll("div", { "class" : "tdTemps" })
    tdPrecips = soup.findAll("div", { "class" : "tdPrecip" })

    results = []
    for i in range(0, 10):
        date = tdDates[i].contents[2].contents[2]
        forecast = tdForecasts[i].contents[2].contents[2]
        temperature = tdTemps[i].contents[2].contents[0].string. \
                                   replace("°", " degrees F")
        precipitation = tdPrecips[i].contents[2].string. \
                                   replace("%", "% chance of rain")
        results.append([ date, forecast, temperature, precipitation ])
    return results

def getWeather(url):
    page = urllib2.urlopen(url)
    soup = BeautifulSoup(page)
    return soup

if __name__ == "__main__":
    soup = getWeather(url)
    results = extractForecast(soup)
    sendEmail(results)

# ChangeLog
# 29th April 2008 - 0.1 - richb - Initial version.