#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright 2014 Google Inc. All Rights Reserved.

"""Queries with paginated results against the shopping search API"""

import pprint

from googleapiclient.discovery import build

try:
    input = raw_input
except NameError:
    pass


SHOPPING_API_VERSION = "v1"
DEVELOPER_KEY = "<YOUR DEVELOPER KEY>"


def main():
    """Get and print a the entire paginated feed of public products in the United
    States.

    Pagination is controlled with the "startIndex" parameter passed to the list
    method of the resource.
    """
    client = build("shopping", SHOPPING_API_VERSION, developerKey=DEVELOPER_KEY)
    resource = client.products()
    # The first request contains the information we need for the total items, and
    # page size, as well as returning the first page of results.
    request = resource.list(source="public", country="US", q="digital camera")
    response = request.execute()
    itemsPerPage = response["itemsPerPage"]
    totalItems = response["totalItems"]
    for i in range(1, totalItems, itemsPerPage):
        answer = input(
            "About to display results from %s to %s, y/(n)? " % (i, i + itemsPerPage)
        )
        if answer.strip().lower().startswith("n"):
            # Stop if the user has had enough
            break
        else:
            # Fetch this series of results
            request = resource.list(
                source="public", country="US", q="digital camera", startIndex=i
            )
            response = request.execute()
            pprint.pprint(response)


if __name__ == "__main__":
    main()