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/*
 *   Copyright 2023-Present Couchbase, 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.
 */

#pragma once

#include <couchbase/geo_point.hxx>
#include <couchbase/search_query.hxx>

#include <optional>
#include <string>

namespace couchbase
{
/**
 * This query finds all matches from a given location as @ref geo_point within the given distance. Both the point and the distance are
 * required.
 *
 * The following query specifies a longitude of `-2.235143` and a latitude of `53.482358`. The target-field `geo` is specified, as is a
 * distance of `100 miles`: this is the radius within which target-locations must reside for their documents to be returned.
 * @snippet test_unit_search.cxx search-geo-distance
 *
 * @see https://docs.couchbase.com/server/current/fts/fts-supported-queries-geo-point-distance.html server documentation
 *
 * @since 1.0.0
 * @committed
 */
class geo_distance_query : public search_query
{
  public:
    /**
     * Create a new geo distance query.
     *
     * @param location the location represents a point from which the distance is measured.
     * @param distance the distance describes how far from the location the radius should be matched. For example, `"11km"`,
     * `"11kilometers"`, `"3nm"`, `"3nauticalmiles"`, `"17mi"`, `"17miles"`, `"19m"`, `"19meters"`.
     *
     * @see https://github.com/blevesearch/bleve/blob/ae28975038cb25655da968e3f043210749ba382b/geo/geo_dist.go#L29-L37 list of distance
     * units.
     *
     * @since 1.0.0
     * @committed
     */
    geo_distance_query(geo_point location, std::string distance)
      : location_{ location }
      , distance_{ std::move(distance) }
    {
    }

    /**
     * Create a new geo distance query.
     *
     * @param latitude the location latitude
     * @param longitude the location longitude
     * @param distance the distance describes how far from the location the radius should be matched. For example, `"11km"`,
     * `"11kilometers"`, `"3nm"`, `"3nauticalmiles"`, `"17mi"`, `"17miles"`, `"19m"`, `"19meters"`.
     *
     * @since 1.0.0
     * @committed
     */
    geo_distance_query(double latitude, double longitude, std::string distance)
      : location_{ geo_point{ latitude, longitude } }
      , distance_{ std::move(distance) }
    {
    }

    /**
     * If a field is specified, only terms in that field will be matched.
     *
     * @param field_name name of the field to be matched
     *
     * @return this query for chaining purposes.
     *
     * @since 1.0.0
     * @committed
     */
    auto field(std::string field_name) -> geo_distance_query&
    {
        field_ = std::move(field_name);
        return *this;
    }

    /**
     * @return encoded representation of the query.
     *
     * @since 1.0.0
     * @internal
     */
    [[nodiscard]] auto encode() const -> encoded_search_query override;

  private:
    geo_point location_;
    std::string distance_;
    std::optional<std::string> field_{};
};
} // namespace couchbase