// Copyright (c) 2011-present The Bitcoin Core developers

// Distributed under the MIT software license, see the accompanying

// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <wallet/rpc/util.h>

#include <common/url.h>

#include <rpc/util.h>

#include <util/any.h>

#include <util/translation.h>

#include <wallet/context.h>

#include <wallet/wallet.h>

#include <optional>

#include <string_view>

#include <univalue.h>

namespace wallet {

static const std::string WALLET_ENDPOINT_BASE = "/wallet/";

const std::string HELP_REQUIRING_PASSPHRASE{"\nRequires wallet passphrase to be set with walletpassphrase call if wallet is encrypted.\n"};

bool GetAvoidReuseFlag(const CWallet& wallet, const UniValue& param) {

    bool can_avoid_reuse = wallet.IsWalletFlagSet(WALLET_FLAG_AVOID_REUSE);

    bool avoid_reuse = param.isNull() ? can_avoid_reuse : param.get_bool();

    if (avoid_reuse && !can_avoid_reuse) {

        throw JSONRPCError(RPC_WALLET_ERROR, "wallet does not have the \"avoid reuse\" feature enabled");

    }

    return avoid_reuse;

}

std::string EnsureUniqueWalletName(const JSONRPCRequest& request, std::optional<std::string_view> wallet_name)

{

    if (auto endpoint_wallet{GetWalletNameFromJSONRPCRequest(request)}) {

        // wallet endpoint was used

        if (wallet_name && *wallet_name != *endpoint_wallet) {

            throw JSONRPCError(RPC_INVALID_PARAMETER,

                "The RPC endpoint wallet and the wallet name parameter specify different wallets");

        }

        return *endpoint_wallet;

    }

    // Not a wallet endpoint; parameter must be provided

    if (!wallet_name) {

        throw JSONRPCError(RPC_INVALID_PARAMETER,

            "Either the RPC endpoint wallet or the wallet name parameter must be provided");

    }

    return std::string{*wallet_name};

}

std::optional<std::string> GetWalletNameFromJSONRPCRequest(const JSONRPCRequest& request)

{

    if (request.URI.starts_with(WALLET_ENDPOINT_BASE)) {

        // wallet endpoint was used

        return UrlDecode(std::string_view{request.URI}.substr(WALLET_ENDPOINT_BASE.size()));

    }

    return std::nullopt;

}

std::shared_ptr<CWallet> GetWalletForJSONRPCRequest(const JSONRPCRequest& request)

{

    CHECK_NONFATAL(request.mode == JSONRPCRequest::EXECUTE);

    WalletContext& context = EnsureWalletContext(request.context);

    if (auto wallet_name{GetWalletNameFromJSONRPCRequest(request)}) {

        std::shared_ptr<CWallet> pwallet{GetWallet(context, *wallet_name)};

        if (!pwallet) throw JSONRPCError(RPC_WALLET_NOT_FOUND, "Requested wallet does not exist or is not loaded");

        return pwallet;

    }

    size_t count{0};

    auto wallet = GetDefaultWallet(context, count);

    if (wallet) return wallet;

    if (count == 0) {

        throw JSONRPCError(

            RPC_WALLET_NOT_FOUND, "No wallet is loaded. Load a wallet using loadwallet or create a new one with createwallet. (Note: A default wallet is no longer automatically created)");

    }

    throw JSONRPCError(RPC_WALLET_NOT_SPECIFIED,

        "Multiple wallets are loaded. Please select which wallet to use by requesting the RPC through the /wallet/<walletname> URI path.");

}

void EnsureWalletIsUnlocked(const CWallet& wallet)

{

    if (wallet.IsLocked()) {

        throw JSONRPCError(RPC_WALLET_UNLOCK_NEEDED, "Error: Please enter the wallet passphrase with walletpassphrase first.");

    }

}

WalletContext& EnsureWalletContext(const std::any& context)

{

    auto wallet_context = util::AnyPtr<WalletContext>(context);

    if (!wallet_context) {

        throw JSONRPCError(RPC_INTERNAL_ERROR, "Wallet context not found");

    }

    return *wallet_context;

}

std::string LabelFromValue(const UniValue& value)

{

    static const std::string empty_string;

    if (value.isNull()) return empty_string;

    const std::string& label{value.get_str()};

    if (label == "*")

        throw JSONRPCError(RPC_WALLET_INVALID_LABEL_NAME, "Invalid label name");

    return label;

}

void PushParentDescriptors(const CWallet& wallet, const CScript& script_pubkey, UniValue& entry)

{

    UniValue parent_descs(UniValue::VARR);

    for (const auto& desc: wallet.GetWalletDescriptors(script_pubkey)) {

        std::string desc_str;

        FlatSigningProvider dummy_provider;

        if (!CHECK_NONFATAL(desc.descriptor->ToNormalizedString(dummy_provider, desc_str, &desc.cache))) continue;

        parent_descs.push_back(desc_str);

    }

    entry.pushKV("parent_descs", std::move(parent_descs));

}

void HandleWalletError(const std::shared_ptr<CWallet>& wallet, DatabaseStatus& status, bilingual_str& error)

{

    if (!wallet) {

        // Map bad format to not found, since bad format is returned when the

        // wallet directory exists, but doesn't contain a data file.

        RPCErrorCode code = RPC_WALLET_ERROR;

        switch (status) {

            case DatabaseStatus::FAILED_NOT_FOUND:

            case DatabaseStatus::FAILED_BAD_FORMAT:

            case DatabaseStatus::FAILED_LEGACY_DISABLED:

                code = RPC_WALLET_NOT_FOUND;

                break;

            case DatabaseStatus::FAILED_ALREADY_LOADED:

                code = RPC_WALLET_ALREADY_LOADED;

                break;

            case DatabaseStatus::FAILED_ALREADY_EXISTS:

                code = RPC_WALLET_ALREADY_EXISTS;

                break;

            case DatabaseStatus::FAILED_NEW_UNNAMED:

            case DatabaseStatus::FAILED_INVALID_BACKUP_FILE:

                code = RPC_INVALID_PARAMETER;

                break;

            case DatabaseStatus::FAILED_ENCRYPT:

                code = RPC_WALLET_ENCRYPTION_FAILED;

                break;

            default: // RPC_WALLET_ERROR is returned for all other cases.

                break;

        }

        throw JSONRPCError(code, error.original);

    }

}

void AppendLastProcessedBlock(UniValue& entry, const CWallet& wallet)

{

    AssertLockHeld(wallet.cs_wallet);

    UniValue lastprocessedblock{UniValue::VOBJ};

    lastprocessedblock.pushKV("hash", wallet.GetLastBlockHash().GetHex());

    lastprocessedblock.pushKV("height", wallet.GetLastBlockHeight());

    entry.pushKV("lastprocessedblock", std::move(lastprocessedblock));

}

} // namespace wallet