/* -*- 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/subdoc/fwd/command_bundle.hxx>

#include <couchbase/codec/encoded_value.hxx>
#include <couchbase/common_durability_options.hxx>
#include <couchbase/expiry.hxx>
#include <couchbase/mutate_in_result.hxx>
#include <couchbase/store_semantics.hxx>
#include <couchbase/subdocument_error_context.hxx>

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

namespace couchbase
{

/**
 * Options for @ref collection#mutate_in().
 *
 * @since 1.0.0
 * @committed
 */
struct mutate_in_options : public common_durability_options<mutate_in_options> {
    /**
     * Immutable value object representing consistent options.
     *
     * @since 1.0.0
     * @internal
     */
    struct built : public common_durability_options<mutate_in_options>::built {
        const std::uint32_t expiry;
        const bool preserve_expiry;
        const couchbase::store_semantics store_semantics;
        const couchbase::cas cas;
        const bool access_deleted;
        const bool create_as_deleted;
    };

    /**
     * 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
    {
        auto base = build_common_durability_options();
        return { base, expiry_, preserve_expiry_, store_semantics_, cas_, access_deleted_, create_as_deleted_ };
    }

    /**
     * Specifies whether an existing document's expiry should be preserved. Defaults to false.
     *
     * If true, and the document exists, its expiry will not be modified. Otherwise the document's expiry is determined by
     * {@link #expiry(std::chrono::seconds)} or {@link #expiry(std::chrono::system_clock::time_point)}.
     *
     * Requires Couchbase Server 7.0 or later.
     *
     * @param preserve `true` to preserve expiry, `false` to set new expiry
     * @return this options class for chaining purposes.
     *
     * @since 1.0.0
     * @committed
     */
    auto preserve_expiry(bool preserve) -> mutate_in_options&
    {
        preserve_expiry_ = preserve;
        return self();
    }

    /**
     * Sets the expiry for the document. By default the document will never expire.
     *
     * The duration must be less than 50 years. For expiry further in the future, use
     * {@link #expiry(std::chrono::system_clock::time_point)}.
     *
     * @param duration the duration after which the document will expire (zero duration means never expire).
     * @return this options class for chaining purposes.
     *
     * @since 1.0.0
     * @committed
     */
    auto expiry(std::chrono::seconds duration) -> mutate_in_options&
    {
        expiry_ = core::impl::expiry_relative(duration);
        return self();
    }

    /**
     * Sets the expiry for the document. By default the document will never expire.
     *
     * @param time_point the point in time when the document will expire (epoch second zero means never expire).
     * @return this options class for chaining purposes.
     *
     * @since 1.0.0
     * @committed
     */
    auto expiry(std::chrono::system_clock::time_point time_point) -> mutate_in_options&
    {
        expiry_ = core::impl::expiry_absolute(time_point);
        return self();
    }

    /**
     * Specifies a CAS value that will be taken into account on the server side for optimistic concurrency.
     *
     * The CAS value is an opaque identifier which is associated with a specific state of the document on the server. The
     * CAS value is received on read operations (or after mutations) and can be used during a subsequent mutation to
     * make sure that the document has not been modified in the meantime.
     *
     * If document on the server has been modified in the meantime the SDK will raise a {@link errc::common::cas_mismatch}. In
     * this case the caller is expected to re-do the whole "fetch-modify-update" cycle again. Please refer to the
     * SDK documentation for more information on CAS mismatches and subsequent retries.
     *
     * @param cas the opaque CAS identifier to use for this operation.
     * @return the {@link mutate_in_options} for chaining purposes.
     *
     * @since 1.0.0
     * @committed
     */
    auto cas(couchbase::cas cas) -> mutate_in_options&
    {
        cas_ = cas;
        return self();
    }
    /**
     * Changes the storing semantics of the outer/enclosing document.
     *
     * While each individual {@link mutate_in_specs} describes the semantics of the respective sub-document section, the
     * {@link store_semantics} are applied to the outer enclosing document as a whole. You can think of using the same
     * verb for a {@link couchbase::store_semantics store_semantics} aligns with the corresponding full document. So for example a
     * {@link store_semantics::insert} works semantically similar to a {@link collection#insert()} and will fail if the document as a whole
     * already exists.
     *
     * @param semantics the store semantics to apply to the document.
     * @return this {@link mutate_in_options} for chaining purposes.
     */
    auto store_semantics(couchbase::store_semantics semantics) -> mutate_in_options&
    {
        store_semantics_ = semantics;
        return self();
    }

    /**
     * For internal use only: allows access to deleted documents that are in 'tombstone' form.
     *
     * @since 1.0.0
     * @internal
     */
    auto access_deleted(bool value) -> mutate_in_options&
    {
        access_deleted_ = value;
        return self();
    }

    /**
     * For internal use only: allows creating documents in 'tombstone' form.
     *
     * @since 1.0.0
     * @internal
     */
    auto create_as_deleted(bool value) -> mutate_in_options&
    {
        create_as_deleted_ = value;
        return self();
    }

  private:
    couchbase::store_semantics store_semantics_{ couchbase::store_semantics::replace };
    couchbase::cas cas_{};
    std::uint32_t expiry_{ 0 };
    bool preserve_expiry_{ false };
    bool access_deleted_{ false };
    bool create_as_deleted_{ false };
};

/**
 * The signature for the handler of the @ref collection#mutate_in() operation
 *
 * @since 1.0.0
 * @uncommitted
 */
using mutate_in_handler = std::function<void(couchbase::subdocument_error_context, mutate_in_result)>;

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

/**
 * @since 1.0.0
 * @internal
 */
void
initiate_mutate_in_operation(std::shared_ptr<couchbase::core::cluster> core,
                             std::string bucket_name,
                             std::string scope_name,
                             std::string collection_name,
                             std::string document_key,
                             const std::vector<couchbase::core::impl::subdoc::command>& specs,
                             couchbase::mutate_in_options::built options,
                             couchbase::mutate_in_handler&& handler);
#endif
} // namespace impl
} // namespace core
} // namespace couchbase