/*
 * Copyright (c) 2024, sakumisu
 *
 * SPDX-License-Identifier: Apache-2.0
 */
#include "usbd_core.h"
#include "usbd_msc.h"

#define MSC_IN_EP  0x81
#define MSC_OUT_EP 0x02

#define USBD_VID           0xFFFF
#define USBD_PID           0xFFFF
#define USBD_MAX_POWER     100
#define USBD_LANGID_STRING 1033

#define USB_CONFIG_SIZE (9 + MSC_DESCRIPTOR_LEN)

#ifdef CONFIG_USB_HS
#define MSC_MAX_MPS 512
#else
#define MSC_MAX_MPS 64
#endif

static const uint8_t device_descriptor[] = {
    USB_DEVICE_DESCRIPTOR_INIT(USB_2_0, 0x00, 0x00, 0x00, USBD_VID, USBD_PID, 0x0200, 0x01)
};

static const uint8_t config_descriptor[] = {
    USB_CONFIG_DESCRIPTOR_INIT(USB_CONFIG_SIZE, 0x01, 0x01, USB_CONFIG_BUS_POWERED, USBD_MAX_POWER),
    MSC_DESCRIPTOR_INIT(0x00, MSC_OUT_EP, MSC_IN_EP, MSC_MAX_MPS, 0x02)
};

static const uint8_t device_quality_descriptor[] = {
    ///////////////////////////////////////
    /// device qualifier descriptor
    ///////////////////////////////////////
    0x0a,
    USB_DESCRIPTOR_TYPE_DEVICE_QUALIFIER,
    0x00,
    0x02,
    0x00,
    0x00,
    0x00,
    0x40,
    0x00,
    0x00,
};

static const char *string_descriptors[] = {
    (const char[]){ 0x09, 0x04 }, /* Langid */
    "CherryUSB",                  /* Manufacturer */
    "CherryUSB MSC DEMO",         /* Product */
    "2022123456",                 /* Serial Number */
};

static const uint8_t *device_descriptor_callback(uint8_t speed)
{
    return device_descriptor;
}

static const uint8_t *config_descriptor_callback(uint8_t speed)
{
    return config_descriptor;
}

static const uint8_t *device_quality_descriptor_callback(uint8_t speed)
{
    return device_quality_descriptor;
}

static const char *string_descriptor_callback(uint8_t speed, uint8_t index)
{
    if (index >= (sizeof(string_descriptors) / sizeof(char *))) {
        return NULL;
    }
    return string_descriptors[index];
}

const struct usb_descriptor msc_ram_descriptor = {
    .device_descriptor_callback = device_descriptor_callback,
    .config_descriptor_callback = config_descriptor_callback,
    .device_quality_descriptor_callback = device_quality_descriptor_callback,
    .string_descriptor_callback = string_descriptor_callback
};

static void usbd_event_handler(uint8_t busid, uint8_t event)
{
    switch (event) {
        case USBD_EVENT_RESET:
            break;
        case USBD_EVENT_CONNECTED:
            break;
        case USBD_EVENT_DISCONNECTED:
            break;
        case USBD_EVENT_RESUME:
            break;
        case USBD_EVENT_SUSPEND:
            break;
        case USBD_EVENT_CONFIGURED:
            break;
        case USBD_EVENT_SET_REMOTE_WAKEUP:
            break;
        case USBD_EVENT_CLR_REMOTE_WAKEUP:
            break;

        default:
            break;
    }
}

#if !defined(RT_CHERRYUSB_DEVICE_MSC_BLKDEV) && !defined(PKG_CHERRYUSB_DEVICE_MSC_BLKDEV)
#define BLOCK_SIZE  512
#define BLOCK_COUNT 10

typedef struct
{
    uint8_t BlockSpace[BLOCK_SIZE];
} BLOCK_TYPE;

BLOCK_TYPE mass_block[BLOCK_COUNT];

void usbd_msc_get_cap(uint8_t busid, uint8_t lun, uint32_t *block_num, uint32_t *block_size)
{
    *block_num = 1000; //Pretend having so many buffer,not has actually.
    *block_size = BLOCK_SIZE;
}
int usbd_msc_sector_read(uint8_t busid, uint8_t lun, uint32_t sector, uint8_t *buffer, uint32_t length)
{
    if (sector < BLOCK_COUNT)
        memcpy(buffer, mass_block[sector].BlockSpace, length);
    return 0;
}

int usbd_msc_sector_write(uint8_t busid, uint8_t lun, uint32_t sector, uint8_t *buffer, uint32_t length)
{
    if (sector < BLOCK_COUNT)
        memcpy(mass_block[sector].BlockSpace, buffer, length);
    return 0;
}
#endif

static struct usbd_interface intf0;

void msc_ram_init(uint8_t busid, uintptr_t reg_base)
{
    usbd_desc_register(busid, &msc_ram_descriptor);
#if defined(RT_CHERRYUSB_DEVICE_MSC_BLKDEV) || defined(PKG_CHERRYUSB_DEVICE_MSC_BLKDEV)
    extern void usbd_msc_blkdev_init(uint8_t busid, uint8_t in_ep, uint8_t out_ep);
    usbd_msc_blkdev_init(busid, MSC_IN_EP, MSC_OUT_EP);
#else
    usbd_add_interface(busid, usbd_msc_init_intf(busid, &intf0, MSC_OUT_EP, MSC_IN_EP));
#endif

    usbd_initialize(busid, reg_base, usbd_event_handler);
}

#if defined(CONFIG_USBDEV_MSC_POLLING)
void msc_ram_polling(uint8_t busid)
{
    usbd_msc_polling(busid);
}
#endif