/* -*- 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.
 */

#include "lookup_in_replica.hxx"
#include "core/impl/subdoc/path_flags.hxx"

#include <couchbase/error_codes.hxx>

namespace couchbase::core::impl
{
std::error_code
lookup_in_replica_request::encode_to(lookup_in_replica_request::encoded_request_type& encoded, mcbp_context&& /* context */)
{
    for (std::size_t i = 0; i < specs.size(); ++i) {
        specs[i].original_index_ = i;
    }
    std::stable_sort(specs.begin(), specs.end(), [](const auto& lhs, const auto& rhs) {
        /* move XATTRs to the beginning of the vector */
        return core::impl::subdoc::has_xattr_path_flag(lhs.flags_) && !core::impl::subdoc::has_xattr_path_flag(rhs.flags_);
    });

    encoded.opaque(opaque);
    encoded.partition(partition);
    encoded.body().id(id);
    encoded.body().read_replica(true);
    encoded.body().specs(specs);
    return {};
}

lookup_in_replica_response
lookup_in_replica_request::make_response(key_value_error_context&& ctx, const encoded_response_type& encoded) const
{

    bool deleted = false;
    couchbase::cas cas{};
    std::vector<lookup_in_replica_response::entry> fields{};
    std::error_code ec = ctx.ec();
    std::optional<std::size_t> first_error_index{};
    std::optional<std::string> first_error_path{};

    if (encoded.status() == key_value_status_code::subdoc_success_deleted ||
        encoded.status() == key_value_status_code::subdoc_multi_path_failure_deleted) {
        deleted = true;
    }
    if (!ctx.ec()) {
        fields.resize(specs.size());
        for (size_t i = 0; i < specs.size(); ++i) {
            const auto& req_entry = specs[i];
            fields[i].original_index = req_entry.original_index_;
            fields[i].path = req_entry.path_;
            fields[i].opcode = static_cast<protocol::subdoc_opcode>(req_entry.opcode_);
            fields[i].status = key_value_status_code::success;
        }
        for (size_t i = 0; i < encoded.body().fields().size(); ++i) {
            const auto& res_entry = encoded.body().fields()[i];
            fields[i].status = res_entry.status;
            fields[i].ec =
              protocol::map_status_code(protocol::client_opcode::subdoc_multi_mutation, static_cast<std::uint16_t>(res_entry.status));
            if (fields[i].opcode == protocol::subdoc_opcode::exists && fields[i].ec == errc::key_value::path_not_found) {
                fields[i].ec.clear();
            }
            if (!fields[i].ec && !ctx.ec()) {
                ec = fields[i].ec;
            }
            if (!first_error_index && !fields[i].ec) {
                first_error_index = i;
                first_error_path = fields[i].path;
            }
            fields[i].exists =
              res_entry.status == key_value_status_code::success || res_entry.status == key_value_status_code::subdoc_success_deleted;
            if (fields[i].opcode == protocol::subdoc_opcode::exists && !fields[i].ec) {
                fields[i].value = utils::json::generate_binary(fields[i].exists);
            } else {
                fields[i].value = utils::to_binary(res_entry.value);
            }
        }
        if (!ec) {
            cas = encoded.cas();
        }
        std::sort(fields.begin(), fields.end(), [](const auto& lhs, const auto& rhs) { return lhs.original_index < rhs.original_index; });
    }

    return lookup_in_replica_response{
        make_subdocument_error_context(ctx, ec, first_error_path, first_error_index, deleted),
        cas,
        std::move(fields),
        deleted,
    };
}
} // namespace couchbase::core::impl