# Copyright 2016 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from datetime import datetime

from google.appengine.api import search


def simple_search(index):
    index.search("rose water")


def search_date(index):
    index.search("1776-07-04")


def search_terms(index):
    # search for documents with pianos that cost less than $5000
    index.search("product = piano AND price < 5000")


def create_document():
    document = search.Document(
        # Setting the doc_id is optional. If omitted, the search service will
        # create an identifier.
        doc_id="PA6-5000",
        fields=[
            search.TextField(name="customer", value="Joe Jackson"),
            search.HtmlField(name="comment", value="this is <em>marked up</em> text"),
            search.NumberField(name="number_of_visits", value=7),
            search.DateField(name="last_visit", value=datetime.now()),
            search.DateField(
                name="birthday", value=datetime(year=1960, month=6, day=19)
            ),
            search.GeoField(
                name="home_location", value=search.GeoPoint(37.619, -122.37)
            ),
        ],
    )
    return document


def add_document_to_index(document):
    index = search.Index("products")
    index.put(document)


def add_document_and_get_doc_id(documents):
    index = search.Index("products")
    results = index.put(documents)
    document_ids = [document.id for document in results]
    return document_ids


def get_document_by_id():
    index = search.Index("products")

    # Get a single document by ID.
    document = index.get("AZ125")

    # Get a range of documents starting with a given ID.
    documents = index.get_range(start_id="AZ125", limit=100)

    return document, documents


def query_index():
    index = search.Index("products")
    query_string = "product: piano AND price < 5000"

    results = index.search(query_string)

    for scored_document in results:
        print(scored_document)


def delete_all_in_index(index):
    # index.get_range by returns up to 100 documents at a time, so we must
    # loop until we've deleted all items.
    while True:
        # Use ids_only to get the list of document IDs in the index without
        # the overhead of getting the entire document.
        document_ids = [document.doc_id for document in index.get_range(ids_only=True)]

        # If no IDs were returned, we've deleted everything.
        if not document_ids:
            break

        # Delete the documents for the given IDs
        index.delete(document_ids)


def async_query(index):
    futures = [index.search_async("foo"), index.search_async("bar")]
    results = [future.get_result() for future in futures]
    return results


def query_options():
    index = search.Index("products")
    query_string = "product: piano AND price < 5000"

    # Create sort options to sort on price and brand.
    sort_price = search.SortExpression(
        expression="price", direction=search.SortExpression.DESCENDING, default_value=0
    )
    sort_brand = search.SortExpression(
        expression="brand", direction=search.SortExpression.DESCENDING, default_value=""
    )
    sort_options = search.SortOptions(expressions=[sort_price, sort_brand])

    # Create field expressions to add new fields to the scored documents.
    price_per_note_expression = search.FieldExpression(
        name="price_per_note", expression="price/88"
    )
    ivory_expression = search.FieldExpression(
        name="ivory", expression='snippet("ivory", summary, 120)'
    )

    # Create query options using the sort options and expressions created
    # above.
    query_options = search.QueryOptions(
        limit=25,
        returned_fields=["model", "price", "description"],
        returned_expressions=[price_per_note_expression, ivory_expression],
        sort_options=sort_options,
    )

    # Build the Query and run the search
    query = search.Query(query_string=query_string, options=query_options)
    results = index.search(query)
    for scored_document in results:
        print(scored_document)


def query_results(index, query_string):
    result = index.search(query_string)
    total_matches = result.number_found
    list_of_docs = result.results
    number_of_docs_returned = len(list_of_docs)
    return total_matches, list_of_docs, number_of_docs_returned


def query_offset(index, query_string):
    offset = 0

    while True:
        # Build the query using the current offset.
        options = search.QueryOptions(offset=offset)
        query = search.Query(query_string=query_string, options=options)

        # Get the results
        results = index.search(query)

        number_retrieved = len(results.results)
        if number_retrieved == 0:
            break

        # Add the number of documents found to the offset, so that the next
        # iteration will grab the next page of documents.
        offset += number_retrieved

        # Process the matched documents
        for document in results:
            print(document)


def query_cursor(index, query_string):
    cursor = search.Cursor()

    while cursor:
        # Build the query using the cursor.
        options = search.QueryOptions(cursor=cursor)
        query = search.Query(query_string=query_string, options=options)

        # Get the results and the next cursor
        results = index.search(query)
        cursor = results.cursor

        for document in results:
            print(document)


def query_per_document_cursor(index, query_string):
    cursor = search.Cursor(per_result=True)

    # Build the query using the cursor.
    options = search.QueryOptions(cursor=cursor)
    query = search.Query(query_string=query_string, options=options)

    # Get the results.
    results = index.search(query)

    document_cursor = None
    for document in results:
        # discover some document of interest and grab its cursor, for this
        # sample we'll just use the first document.
        document_cursor = document.cursor
        break

    # Start the next search from the document of interest.
    if document_cursor is None:
        return

    options = search.QueryOptions(cursor=document_cursor)
    query = search.Query(query_string=query_string, options=options)
    results = index.search(query)

    for document in results:
        print(document)


def saving_and_restoring_cursor(cursor):
    # Convert the cursor to a web-safe string.
    cursor_string = cursor.web_safe_string
    # Restore the cursor from a web-safe string.
    cursor = search.Cursor(web_safe_string=cursor_string)


def add_faceted_document(index):
    document = search.Document(
        doc_id="doc1",
        fields=[search.AtomField(name="name", value="x86")],
        facets=[
            search.AtomFacet(name="type", value="computer"),
            search.NumberFacet(name="ram_size_gb", value=8),
        ],
    )

    index.put(document)


def facet_discovery(index):
    # Create the query and enable facet discovery.
    query = search.Query("name:x86", enable_facet_discovery=True)
    results = index.search(query)

    for facet in results.facets:
        print("facet {}.".format(facet.name))
        for value in facet.values:
            print(
                "{}: count={}, refinement_token={}".format(
                    value.label, value.count, value.refinement_token
                )
            )


def facet_by_name(index):
    # Create the query and specify to only return the "type" and "ram_size_gb"
    # facets.
    query = search.Query("name:x86", return_facets=["type", "ram_size_gb"])
    results = index.search(query)

    for facet in results.facets:
        print("facet {}".format(facet.name))
        for value in facet.values:
            print(
                "{}: count={}, refinement_token={}".format(
                    value.label, value.count, value.refinement_token
                )
            )


def facet_by_name_and_value(index):
    # Create the query and specify to return the "type" facet with values
    # "computer" and "printer" and the "ram_size_gb" facet with value in the
    # ranges [0,4), [4, 8), and [8, max].
    query = search.Query(
        "name:x86",
        return_facets=[
            search.FacetRequest("type", values=["computer", "printer"]),
            search.FacetRequest(
                "ram_size_gb",
                ranges=[
                    search.FacetRange(end=4),
                    search.FacetRange(start=4, end=8),
                    search.FacetRange(start=8),
                ],
            ),
        ],
    )

    results = index.search(query)
    for facet in results.facets:
        print("facet {}".format(facet.name))
        for value in facet.values:
            print(
                "{}: count={}, refinement_token={}".format(
                    value.label, value.count, value.refinement_token
                )
            )