#include "usbd_core.h"
#include "usbd_cdc.h"

/*!< endpoint address */
#define CDC_IN_EP  0x81
#define CDC_OUT_EP 0x02
#define CDC_INT_EP 0x83

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

/*!< config descriptor size */
#define USB_CONFIG_SIZE (9 + CDC_ACM_DESCRIPTOR_LEN)

/*!< global descriptor */
static const uint8_t cdc_descriptor[] = {
    USB_DEVICE_DESCRIPTOR_INIT(USB_2_0, 0xEF, 0x02, 0x01, USBD_VID, USBD_PID, 0x0100, 0x01),
    USB_CONFIG_DESCRIPTOR_INIT(USB_CONFIG_SIZE, 0x02, 0x01, USB_CONFIG_BUS_POWERED, USBD_MAX_POWER),
    CDC_ACM_DESCRIPTOR_INIT(0x00, CDC_INT_EP, CDC_OUT_EP, CDC_IN_EP, 0x02),
    ///////////////////////////////////////
    /// string0 descriptor
    ///////////////////////////////////////
    USB_LANGID_INIT(USBD_LANGID_STRING),
    ///////////////////////////////////////
    /// string1 descriptor
    ///////////////////////////////////////
    0x16,                       /* bLength */
    USB_DESCRIPTOR_TYPE_STRING, /* bDescriptorType */
    'E', 0x00,                  /* wcChar0 */
    'm', 0x00,                  /* wcChar1 */
    'i', 0x00,                  /* wcChar2 */
    'l', 0x00,                  /* wcChar3 */
    ' ', 0x00,                  /* wcChar4 */
    'L', 0x00,                  /* wcChar5 */
    'e', 0x00,                  /* wcChar6 */
    'r', 0x00,                  /* wcChar7 */
    'c', 0x00,                  /* wcChar8 */
    'h', 0x00,                  /* wcChar9 */
    ///////////////////////////////////////
    /// string2 descriptor
    ///////////////////////////////////////
    0x22,                       /* bLength */
    USB_DESCRIPTOR_TYPE_STRING, /* bDescriptorType */
    'B', 0x00,                  /* wcChar0 */
    'L', 0x00,                  /* wcChar1 */
    '6', 0x00,                  /* wcChar2 */
    '1', 0x00,                  /* wcChar3 */
    '6', 0x00,                  /* wcChar4 */
    ' ', 0x00,                  /* wcChar5 */
    'B', 0x00,                  /* wcChar6 */
    'a', 0x00,                  /* wcChar7 */
    'r', 0x00,                  /* wcChar8 */
    'e', 0x00,                  /* wcChar9 */
    ' ', 0x00,                  /* wcChar10 */
    'M', 0x00,                  /* wcChar11 */
    'e', 0x00,                  /* wcChar12 */
    't', 0x00,                  /* wcChar13 */
    'a', 0x00,                  /* wcChar14 */
    'l', 0x00,                  /* wcChar15 */
    ///////////////////////////////////////
    /// string3 descriptor
    ///////////////////////////////////////
    0x16,                       /* bLength */
    USB_DESCRIPTOR_TYPE_STRING, /* bDescriptorType */
    '2', 0x00,                  /* wcChar0 */
    '0', 0x00,                  /* wcChar1 */
    '2', 0x00,                  /* wcChar2 */
    '3', 0x00,                  /* wcChar3 */
    '-', 0x00,                  /* wcChar4 */
    '0', 0x00,                  /* wcChar5 */
    '4', 0x00,                  /* wcChar6 */
    '-', 0x00,                  /* wcChar7 */
    '1', 0x00,                  /* wcChar8 */
    '9', 0x00,                  /* wcChar9 */
#ifdef CONFIG_USB_HS
    ///////////////////////////////////////
    /// device qualifier descriptor
    ///////////////////////////////////////
    0x0a,
    USB_DESCRIPTOR_TYPE_DEVICE_QUALIFIER,
    0x00,
    0x02,
    0x02,
    0x02,
    0x01,
    0x40,
    0x01,
    0x00,
#endif
    0x00
};

USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t read_buffer[2048];
USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t write_buffer[2048];

volatile bool ep_tx_busy_flag = false;

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

void usbd_configure_done_callback(void)
{
    /* setup first out ep read transfer */
    usbd_ep_start_read(CDC_OUT_EP, read_buffer, 2048);
}

void usbd_cdc_acm_bulk_out(uint8_t ep, uint32_t nbytes)
{
    USB_LOG_RAW("actual out len:%d\r\n", nbytes);
    // for (int i = 0; i < 100; i++) {
    //     printf("%02x ", read_buffer[i]);
    // }
    // printf("\r\n");
    /* setup next out ep read transfer */
    usbd_ep_start_read(CDC_OUT_EP, read_buffer, 2048);
}

void usbd_cdc_acm_bulk_in(uint8_t ep, uint32_t nbytes)
{
    USB_LOG_RAW("actual in len:%d\r\n", nbytes);

    if ((nbytes % CDC_MAX_MPS) == 0 && nbytes) {
        /* send zlp */
        usbd_ep_start_write(CDC_IN_EP, NULL, 0);
    } else {
        ep_tx_busy_flag = false;
    }
}

/*!< endpoint call back */
struct usbd_endpoint cdc_out_ep = {
    .ep_addr = CDC_OUT_EP,
    .ep_cb = usbd_cdc_acm_bulk_out
};

struct usbd_endpoint cdc_in_ep = {
    .ep_addr = CDC_IN_EP,
    .ep_cb = usbd_cdc_acm_bulk_in
};

struct usbd_interface intf0;
struct usbd_interface intf1;

/* function ------------------------------------------------------------------*/
void cdc_acm_init(void)
{
    const uint8_t data[10] = { 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x30 };

    memcpy(&write_buffer[0], data, 10);
    memset(&write_buffer[10], 'a', 2038);

    usbd_desc_register(cdc_descriptor);
    usbd_add_interface(usbd_cdc_acm_init_intf(&intf0));
    usbd_add_interface(usbd_cdc_acm_init_intf(&intf1));
    usbd_add_endpoint(&cdc_out_ep);
    usbd_add_endpoint(&cdc_in_ep);
    usbd_initialize();
}

volatile uint8_t dtr_enable = 0;

void usbd_cdc_acm_set_dtr(uint8_t intf, bool dtr)
{
    if (dtr) {
        dtr_enable = 1;
    } else {
        dtr_enable = 0;
    }
}

void cdc_acm_data_send_with_dtr(const uint8_t *data, uint32_t data_len )
{
    if (dtr_enable) {
        ep_tx_busy_flag = true;
        usbd_ep_start_write(CDC_IN_EP, data, data_len);
        while (ep_tx_busy_flag) {
        }
    }
}

void cdc_acm_data_send_with_dtr_test(void)
{
    if (dtr_enable) {
        ep_tx_busy_flag = true;
        usbd_ep_start_write(CDC_IN_EP, write_buffer, 2048);
        while (ep_tx_busy_flag) {
        }
    }
}