/* -*- Mode: C++; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
 *   Copyright 2020-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/common_options.hxx>
#include <couchbase/get_result.hxx>
#include <couchbase/key_value_error_context.hxx>

#include <chrono>
#include <functional>
#include <memory>
#include <optional>

namespace couchbase
{
/**
 * Options for collection#get().
 *
 * @since 1.0.0
 * @committed
 */
struct get_options : public common_options<get_options> {
    /**
     * Immutable value object representing consistent options.
     *
     * @since 1.0.0
     * @internal
     */
    struct built : public common_options<get_options>::built {
        const bool with_expiry;
        const std::vector<std::string> projections;
    };

    static constexpr std::size_t maximum_number_of_projections{ 16U };

    /**
     * Validates options and returns them as an immutable value.
     *
     * @return consistent options as an immutable value
     *
     * @exception std::system_error with code errc::common::invalid_argument if the options are not valid
     *
     * @since 1.0.0
     * @internal
     */
    [[nodiscard]] auto build() const -> built
    {
        if (projections_.size() + (with_expiry_ ? 2 : 1) < maximum_number_of_projections) {
            return { build_common_options(), with_expiry_, projections_ };
        }
        return { build_common_options(), with_expiry_, {} };
    }

    /**
     * If set to true, the get will fetch the expiry for the document as well and return it as part of the {@link get_result}.
     *
     * @param return_expiry true if it should be fetched.
     * @return this options builder for chaining purposes.
     *
     * @since 1.0.0
     * @committed
     */
    auto with_expiry(bool return_expiry) -> get_options&
    {
        with_expiry_ = return_expiry;
        return self();
    }

    /**
     * Allows to specify a custom list paths to fetch from the document instead of the whole.
     *
     * @note that a maximum of 16 individual paths can be projected at a time due to a server limitation. If you need more than that, think
     * about fetching less-generic paths or the full document straight away.
     *
     * @param field_paths a list of paths that should be loaded if present.
     * @return this options builder for chaining purposes.
     *
     * @since 1.0.0
     * @committed
     */
    auto project(std::vector<std::string> field_paths) -> get_options&
    {
        projections_ = std::move(field_paths);
        return self();
    }

  private:
    bool with_expiry_{ false };
    std::vector<std::string> projections_{};
};

/**
 * The signature for the handler of the @ref collection#get() operation
 *
 * @since 1.0.0
 * @uncommitted
 */
using get_handler = std::function<void(couchbase::key_value_error_context, get_result)>;

#ifndef COUCHBASE_CXX_CLIENT_DOXYGEN
namespace core
{
class cluster;
namespace impl
{

/**
 * @since 1.0.0
 * @internal
 */
void
initiate_get_operation(std::shared_ptr<couchbase::core::cluster> core,
                       std::string bucket_name,
                       std::string scope_name,
                       std::string collection_name,
                       std::string document_key,
                       get_options::built options,
                       get_handler&& handler);
#endif
} // namespace impl
} // namespace core
} // namespace couchbase