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// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later

// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later

#include "core/hle/service/ipc_helpers.h"
#include "core/hle/service/sockets/nsd.h"

#include "common/string_util.h"

namespace Service::Sockets {

constexpr Result ResultOverflow{ErrorModule::NSD, 6};

// This is nn::oe::ServerEnvironmentType
enum class ServerEnvironmentType : u8 {
    Dd,
    Lp,
    Sd,
    Sp,
    Dp,
};

// This is nn::nsd::EnvironmentIdentifier
struct EnvironmentIdentifier {
    std::array<u8, 8> identifier;
};
static_assert(sizeof(EnvironmentIdentifier) == 0x8);

NSD::NSD(Core::System& system_, const char* name) : ServiceFramework{system_, name} {
}

static std::string ResolveImpl(const std::string& fqdn_in) {
    // The real implementation makes various substitutions.
    // For now we just return the string as-is, which is good enough when not
    // connecting to real Nintendo servers.
    LOG_WARNING(Service, "(STUBBED) called, fqdn_in={}", fqdn_in);
    return fqdn_in;
}

static Result ResolveCommon(const std::string& fqdn_in, std::array<char, 0x100>& fqdn_out) {
    const auto res = ResolveImpl(fqdn_in);
    if (res.size() >= fqdn_out.size()) {
        return ResultOverflow;
    }
    std::memcpy(fqdn_out.data(), res.c_str(), res.size() + 1);
    return ResultSuccess;
}

void NSD::SetChangeEnvironmentIdentifierDisabled(HLERequestContext& ctx) {
    IPC::RequestParser rp{ctx};
    const bool disabled = rp.Pop<bool>();

    LOG_WARNING(Service, "(STUBBED) called, disabled={}", disabled);

    IPC::ResponseBuilder rb{ctx, 1};
    rb.Push(ResultSuccess);
}

void NSD::Resolve(HLERequestContext& ctx) {
    const std::string fqdn_in = Common::StringFromBuffer(ctx.ReadBuffer(0));

    std::array<char, 0x100> fqdn_out{};
    const Result res = ResolveCommon(fqdn_in, fqdn_out);

    ctx.WriteBuffer(fqdn_out);
    IPC::ResponseBuilder rb{ctx, 2};
    rb.Push(res);
}

void NSD::ResolveEx(HLERequestContext& ctx) {
    const std::string fqdn_in = Common::StringFromBuffer(ctx.ReadBuffer(0));

    std::array<char, 0x100> fqdn_out;
    const Result res = ResolveCommon(fqdn_in, fqdn_out);

    if (res.IsError()) {
        IPC::ResponseBuilder rb{ctx, 2};
        rb.Push(res);
        return;
    }

    ctx.WriteBuffer(fqdn_out);
    IPC::ResponseBuilder rb{ctx, 4};
    rb.Push(ResultSuccess);
    rb.Push(ResultSuccess);
}

void NSD::GetEnvironmentIdentifier(HLERequestContext& ctx) {
    constexpr EnvironmentIdentifier lp1 = {
        .identifier = {'l', 'p', '1', '\0', '\0', '\0', '\0', '\0'}};
    ctx.WriteBuffer(lp1);

    IPC::ResponseBuilder rb{ctx, 2};
    rb.Push(ResultSuccess);
}

void NSD::GetApplicationServerEnvironmentType(HLERequestContext& ctx) {
    IPC::ResponseBuilder rb{ctx, 3};
    rb.Push(ResultSuccess);
    rb.Push(static_cast<u32>(ServerEnvironmentType::Lp));
}

NSD::~NSD() = default;

} // namespace Service::Sockets