#!/usr/bin/python
#
# cheap_books.py - v0.3
#
# Copyright (c) 2007-2008 - Rich Burridge - Sun Microsystems Inc.
# All Rights Reserved.
#
# Usage: python cheap_books.py
#
# Find out if any of the books you are interested in, are available used
# from Amazon, below a given price. If there are, then an email is
# automatically sent to me containing the URL's of those books.
#
# Looks for a file called "books.py" in the same directory as this script,
# and uses that as input. This will have been created by the make_book_list.py
# script.
#
# Uses PyAWS, a Python wrapper for the latest Amazon Web Service.
# Kun Xi.
# [http://pyaws.sourceforge.net/]
#
# 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 ecs
import os
import smtplib
import sys
import time

# ------ START OF CONFIGURABLE SECTION ----

# Amazon Access License Key.
#
amazonAccessKey = "XXXXXXXXXXXXXXXXXXXX"

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

# ------ END OF CONFIGURABLE SECTION ------

# List of books found below the given price.
#
foundBooks = []

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

%s
"""

scriptDir = os.path.dirname(sys.argv[0])
sys.path.insert(0, scriptDir)

try:
    import books
except ImportError:
    print "Unable to find `books.py`"
    sys.exit(1)

def sendEmail(foundBooks):
    SERVER = "localhost"
    FROM = emailAddr
    TO = [ emailAddr]
    SUBJECT = "Amazon Used Books Found Below Your Desired Price."

    TEXT = ""
    for book in foundBooks:
        TEXT += "\nTitle: %s\n" % (''.join([ x[0] for x in book.Title ]))
        TEXT += "Used Price: %s\n" % \
                          str(book.OfferSummary.LowestUsedPrice.FormattedPrice)
        TEXT += "Url: http://www.amazon.com/exec/obidos/ASIN/%s/am841-20\n\n" \
                             % str(book.ASIN)

    message = messageTemplate % (FROM, ", ".join(TO), SUBJECT, TEXT)
    server = smtplib.SMTP(SERVER)
    server.sendmail(FROM, TO, message)
    server.quit()

def checkBookList(list):
    for asin, price, title in list:
        # Lookup a book on Amazon by ASIN.
        print "Checking Title: ", title
        results = ecs.ItemLookup(asin, ResponseGroup='Large')

        try:
            usedPrice = results[0].OfferSummary.LowestUsedPrice.FormattedPrice
            if float(usedPrice[1:]) < float(price[1:]):
                print "FOUND: Title: ", title
                foundBooks.append(results[0])
        except:
            pass

    if foundBooks:
        sendEmail(foundBooks)

if __name__ == "__main__":
    ecs.setLicenseKey(amazonAccessKey)
    checkBookList(books.list_of_books)

# ChangeLog
#  9th April     2008 - 0.3 - richb - version using ecs.py.
# 25th February  2008 - 0.2 - richb - Add 1 second sleep to prevent 503 errors.
#  3rd September 2007 - 0.1 - richb - Initial version.