#include "configuration.h"
#include <cstring>
namespace ks
{
bool configurationPeer(HWND window, const wchar_t *filename)
{
    DWORD pid{};
    GetWindowThreadProcessId(window, &pid);
    HANDLE process = OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, FALSE, pid);
    if (!process) return false;
    wchar_t path[32768]; DWORD count = std::size(path);
    bool ok = QueryFullProcessImageNameW(process, 0, path, &count) != 0;
    CloseHandle(process);
    auto expected = std::filesystem::path(executable()).parent_path() / filename;
    return ok && _wcsicmp(path, expected.c_str()) == 0;
}
void launchConfiguration(App &app, bool snippets, bool logs)
{
    auto path = std::filesystem::path(executable()).parent_path() / L"KSwitcher.Config.exe";
    if (!std::filesystem::exists(path))
        throw std::runtime_error("KSwitcher.Config.exe is missing. Extract the complete application package.");
    auto command = L"\"" + path.wstring() + L"\"" + (logs ? L" --logs" : snippets ? L" --snippets" : L"");
    STARTUPINFOW startup{sizeof(startup)};
    PROCESS_INFORMATION process{};
    if (!CreateProcessW(path.c_str(), command.data(), nullptr, nullptr, FALSE, 0, nullptr,
                        path.parent_path().c_str(), &startup, &process))
        throw std::runtime_error(utf8(lastError(L"Cannot start configurator")));
    AllowSetForegroundWindow(process.dwProcessId);
    CloseHandle(process.hThread);
    CloseHandle(process.hProcess);
    (void)app;
}
LRESULT configurationRequest(App &app, HWND sender, const COPYDATASTRUCT &message)
{
    if (!configurationPeer(sender, L"KSwitcher.Config.exe") || message.cbData > ConfigLimit ||
        (message.cbData && !message.lpData)) return FALSE;
    Bytes reply;
    bool ok = false;
    try
    {
        switch (message.dwData)
        {
        case ConfigSave:
        {
            if (app.busy) throw std::runtime_error("Wait for the current text operation to finish.");
            if (message.cbData < sizeof(DWORD)) throw std::runtime_error("Invalid settings request.");
            DWORD length{};
            memcpy(&length, message.lpData, sizeof(length));
            if (length > message.cbData - sizeof(length)) throw std::runtime_error("Invalid settings snapshot.");
            auto begin = static_cast<const unsigned char *>(message.lpData) + sizeof(length);
            if (Bytes(begin, begin + length) != encodeSettings(app.settings))
                throw std::runtime_error("Settings changed in KSwitcher. Close and reopen the configurator before saving.");
            Bytes next(begin + length, static_cast<const unsigned char *>(message.lpData) + message.cbData);
            if (next.empty()) throw std::runtime_error("Empty settings request.");
            app.applySettings(decodeSettings(next, app.layouts));
            reply = encodeSettings(app.settings);
            break;
        }
        case ConfigLayouts:
            if (app.busy) throw std::runtime_error("Wait for the current text operation to finish.");
            app.reloadLayouts();
            [[fallthrough]];
        case ConfigRead:
            reply = encodeSettings(app.settings);
            break;
        case ConfigClearHistory:
            app.clearHistory();
            break;
        case ConfigCapture:
        {
            if (message.cbData != sizeof(HWND)) throw std::runtime_error("Invalid shortcut field.");
            HWND field{}; memcpy(&field, message.lpData, sizeof(field));
            DWORD fieldPid{}, senderPid{};
            GetWindowThreadProcessId(field, &fieldPid);
            GetWindowThreadProcessId(sender, &senderPid);
            if (field && fieldPid != senderPid) throw std::runtime_error("Invalid shortcut field owner.");
            app.setHotkeyCapture(field);
            break;
        }
        case ConfigLogs:
            PostMessageW(app.window, WM_HOTKEY, 22, 0);
            break;
        case ConfigClearLog:
            if (message.cbData != 1 || *static_cast<const unsigned char *>(message.lpData) > 1)
                throw std::runtime_error("Invalid log selection.");
            app.clearLog(*static_cast<const unsigned char *>(message.lpData) != 0);
            break;
        default: return FALSE;
        }
        ok = true;
    }
    catch (const std::exception &error)
    {
        std::string text = error.what();
        reply.assign(text.begin(), text.end());
    }
    COPYDATASTRUCT response{ConfigReply, (DWORD)reply.size(), reply.data()};
    DWORD_PTR received{};
    if (!SendMessageTimeoutW(sender, WM_COPYDATA, (WPARAM)app.window, (LPARAM)&response,
                             SMTO_ABORTIFHUNG, 2000, &received)) return FALSE;
    return ok ? 1 : 2;
}
}