/**
 * @file mvgal_dxvk.cpp
 * @brief DXVK integration bridge for DirectX 9/10/11 to Vulkan translation
 *
 * MVGAL - Multi-Vendor GPU Aggregation Layer for Linux
 *
 * SPDX-License-Identifier: MIT
 */

#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cstdint>
#include <dlfcn.h>

#include "mvgal_dxvk.h"

/* DXVK bridge state */
static bool g_dxvk_initialized = false;
static uint32_t g_dxvk_version = 0;

/**
 * @brief Initialize DXVK bridge
 * @return 0 on success, -1 on failure
 */
int dxvk_bridge_init(void) {
    if (g_dxvk_initialized) {
        return 0;
    }
    
    /* Check for DXVK library */
    void *handle = dlopen("libdxvk.so", RTLD_LAZY);
    if (!handle) {
        /* Try Proton's DXVK */
        handle = dlopen("libdxvk_proton.so", RTLD_LAZY);
        if (!handle) {
            fprintf(stderr, "MVGAL: DXVK bridge: DXVK library not found\n");
            /* Non-fatal - we can still work with native Vulkan */
        }
    }
    
    g_dxvk_initialized = true;
    g_dxvk_version = 200;  /* Assume DXVK 2.0+ */
    
    return 0;
}

/**
 * @brief Get DXVK version
 * @return DXVK version (major * 100 + minor)
 */
uint32_t dxvk_bridge_get_version(void) {
    return g_dxvk_version;
}

/**
 * @brief Check if DXVK bridge is available
 * @return Non-zero if available, 0 if not
 */
int dxvk_bridge_is_available(void) {
    return g_dxvk_initialized ? 1 : 0;
}

/**
 * @brief Get DXVK device properties
 * @param device Output device properties
 * @return 0 on success, -1 on failure
 */
int dxvk_bridge_get_device_properties(DXVKDeviceProperties *device) {
    if (!g_dxvk_initialized || !device) {
        return -1;
    }
    
    /* Fill with default properties */
    memset(device, 0, sizeof(*device));
    device->vendorID = 0x1A4B;  /* MVGAL custom vendor */
    device->deviceID = 0x0001;
    device->apiVersion = 0x10300;  /* Vulkan 1.3 */
    
    return 0;
}

/**
 * @brief Submit DXVK command buffer through MVGAL
 * @param cmd_buf Command buffer to submit
 * @param wait_semaphore Wait semaphore
 * @param signal_semaphore Signal semaphore
 * @return 0 on success, -1 on failure
 */
int dxvk_bridge_submit_command_buffer(
    DXVKCommandBuffer *cmd_buf,
    uint64_t wait_semaphore,
    uint64_t signal_semaphore
) {
    if (!g_dxvk_initialized) {
        return -1;
    }
    
    /* Pass through to MVGAL scheduler */
    /* In a real implementation, this would translate DXVK's internal
     * command buffer format to MVGAL's workload structure */
    
    return 0;
}