#include <iostream>
#include <algorithm>
#include <stdexcept>
#include <memory>
#include <xcb/xcb.h>
#include "xcbXorg.h"

struct XcbConnectionInfo {
    std::unique_ptr<xcb_connection_t, decltype(&xcb_disconnect)> connection;
    int screenNumber;

    XcbConnectionInfo()
        : connection(nullptr, &xcb_disconnect), screenNumber(0) {}
};

static XcbConnectionInfo xcbConn;

static CExportedImplexorApiDesc xcbXorgExportedImplexorApis[] =
{
    {
        .name = "video-implexor"
    }
};

static sal_mlo_initializeIndFn xcbXorg_initializeInd;
static sal_mlo_finalizeIndFn xcbXorg_finalizeInd;
static sal_mlo_attachDeviceReqFn xcbXorg_attachDeviceReq;
static sal_mlo_detachDeviceReqFn xcbXorg_detachDeviceReq;

static Csal_mgmt_libOps xcbXorgMgmtLibOps =
{
    .initializeInd = xcbXorg_initializeInd,
    .finalizeInd = xcbXorg_finalizeInd,
    .attachDeviceReq = xcbXorg_attachDeviceReq,
    .detachDeviceReq = xcbXorg_detachDeviceReq
};

static CSenseApiDesc xcbXorgApiDesc =
{
    .name = "xcb-xorg",
    .numExportedImplexorApis = sizeof(xcbXorgExportedImplexorApis) /
        sizeof(*xcbXorgExportedImplexorApis),
    .exportedImplexorApis = xcbXorgExportedImplexorApis,
    .sal_mgmt_libOps = &xcbXorgMgmtLibOps
};

extern HK_UNMANGLED getSenseApiDescFn HK_GET_SENSE_API_DESC_FN_NAME;

const CSenseApiDesc *HK_GET_SENSE_API_DESC_FN_NAME(void)
{
    return &xcbXorgApiDesc;
}

static sal_mlo_initializeIndFn xcbXorg_initializeInd;
int xcbXorg_initializeInd(void)
{
    xcbConn.connection.reset(
        xcb_connect(nullptr, &xcbConn.screenNumber));

    if (xcb_connection_has_error(xcbConn.connection.get()))
    {
        throw std::runtime_error(
            std::string(__func__) + ": Failed to connect to X server");
    }

    std::cout << __func__ << ": Connected to X server, screen number "
              << xcbConn.screenNumber << "\n";
    return 0;
}

static sal_mlo_finalizeIndFn xcbXorg_finalizeInd;
int xcbXorg_finalizeInd(void)
{
    if (!xcbConn.connection) {
        return 0;
    }
    xcbConn.connection.reset();
    std::cout << __func__ << ": Disconnected from X server\n";
    return 0;
}

static sal_mlo_attachDeviceReqFn xcbXorg_attachDeviceReq;
int xcbXorg_attachDeviceReq(const CSenseDeviceSpec *const desc)
{
    std::cout << __func__ << ": Attaching device spec: " << *desc << "\n";
    return 0;
}

static sal_mlo_detachDeviceReqFn xcbXorg_detachDeviceReq;
int xcbXorg_detachDeviceReq(const CSenseDeviceSpec *const spec)
{
    std::cout << __func__ << "\n";
    return 0;
}