//------------------------------------------------------------------------------
/*
    This file is part of clio: https://github.com/XRPLF/clio
    Copyright (c) 2023, the clio developers.

    Permission to use, copy, modify, and distribute this software for any
    purpose with or without fee is hereby granted, provided that the above
    copyright notice and this permission notice appear in all copies.

    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    ANY  SPECIAL,  DIRECT,  INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================

#pragma once

#include "data/BackendInterface.hpp"
#include "rpc/JS.hpp"
#include "rpc/common/Modifiers.hpp"
#include "rpc/common/Specs.hpp"
#include "rpc/common/Types.hpp"
#include "rpc/common/Validators.hpp"

#include <boost/json/conversion.hpp>
#include <boost/json/value.hpp>
#include <xrpl/protocol/STLedgerEntry.h>
#include <xrpl/protocol/jss.h>

#include <cstdint>
#include <memory>
#include <optional>
#include <string>
#include <vector>

namespace rpc {

/**
 * @brief The account_channels method returns information about an account's Payment Channels. This includes only
 * channels where the specified account is the channel's source, not the destination.
 * All information retrieved is relative to a particular version of the ledger.
 *
 * For more details see: https://xrpl.org/account_channels.html
 */
class AccountChannelsHandler {
    // dependencies
    std::shared_ptr<BackendInterface> const sharedPtrBackend_;

public:
    static constexpr auto kLIMIT_MIN = 10;
    static constexpr auto kLIMIT_MAX = 400;
    static constexpr auto kLIMIT_DEFAULT = 200;

    /**
     * @brief A struct to hold data for one channel response
     *
     * @note type aligned with SField.h
     */
    struct ChannelResponse {
        std::string channelID;
        std::string account;
        std::string accountDestination;
        std::string amount;
        std::string balance;
        std::optional<std::string> publicKey;
        std::optional<std::string> publicKeyHex;
        uint32_t settleDelay{};
        std::optional<uint32_t> expiration;
        std::optional<uint32_t> cancelAfter;
        std::optional<uint32_t> sourceTag;
        std::optional<uint32_t> destinationTag;
    };

    /**
     * @brief A struct to hold the output data of the command
     */
    struct Output {
        std::vector<ChannelResponse> channels;
        std::string account;
        std::string ledgerHash;
        uint32_t ledgerIndex{};
        // validated should be sent via framework
        bool validated = true;
        uint32_t limit{};
        std::optional<std::string> marker;
    };

    /**
     * @brief A struct to hold the input data for the command
     */
    struct Input {
        std::string account;
        std::optional<std::string> destinationAccount;
        std::optional<std::string> ledgerHash;
        std::optional<uint32_t> ledgerIndex;
        uint32_t limit = kLIMIT_DEFAULT;
        std::optional<std::string> marker;
    };

    using Result = HandlerReturnType<Output>;

    /**
     * @brief Construct a new AccountChannelsHandler object
     *
     * @param sharedPtrBackend The backend to use
     */
    AccountChannelsHandler(std::shared_ptr<BackendInterface> const& sharedPtrBackend)
        : sharedPtrBackend_(sharedPtrBackend)
    {
    }

    /**
     * @brief Returns the API specification for the command
     *
     * @param apiVersion The api version to return the spec for
     * @return The spec for the given apiVersion
     */
    static RpcSpecConstRef
    spec([[maybe_unused]] uint32_t apiVersion)
    {
        static auto const kRPC_SPEC = RpcSpec{
            {JS(account), validation::Required{}, validation::CustomValidators::accountValidator},
            {JS(destination_account), validation::Type<std::string>{}, validation::CustomValidators::accountValidator},
            {JS(ledger_hash), validation::CustomValidators::uint256HexStringValidator},
            {JS(limit),
             validation::Type<uint32_t>{},
             validation::Min(1u),
             modifiers::Clamp<int32_t>{kLIMIT_MIN, kLIMIT_MAX}},
            {JS(ledger_index), validation::CustomValidators::ledgerIndexValidator},
            {JS(marker), validation::CustomValidators::accountMarkerValidator},
        };

        return kRPC_SPEC;
    }

    /**
     * @brief Process the AccountChannels command
     *
     * @param input The input data for the command
     * @param ctx The context of the request
     * @return The result of the operation
     */
    Result
    process(Input input, Context const& ctx) const;

private:
    static void
    addChannel(std::vector<ChannelResponse>& jsonChannels, ripple::SLE const& channelSle);

    /**
     * @brief Convert the Output to a JSON object
     *
     * @param [out] jv The JSON object to convert to
     * @param output The output to convert
     */
    friend void
    tag_invoke(boost::json::value_from_tag, boost::json::value& jv, Output const& output);

    /**
     * @brief Convert a JSON object to Input type
     *
     * @param jv The JSON object to convert
     * @return Input parsed from the JSON object
     */
    friend Input
    tag_invoke(boost::json::value_to_tag<Input>, boost::json::value const& jv);

    /**
     * @brief Convert the ChannelResponse to a JSON object
     *
     * @param [out] jv The JSON object to convert to
     * @param channel The channel response to convert
     */
    friend void
    tag_invoke(boost::json::value_from_tag, boost::json::value& jv, ChannelResponse const& channel);
};
}  // namespace rpc
