/*
 * Copyright (c) 2026, sakumisu
 *
 * SPDX-License-Identifier: Apache-2.0
 */
#include "usbd_core.h"
#include "usbd_cdc_acm.h"

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

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

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

static const uint8_t device_descriptor[] = {
    USB_DEVICE_DESCRIPTOR_INIT(USB_2_0, 0xEF, 0x02, 0x01, USBD_VID, USBD_PID, 0x0100, 0x01)
};

static const uint8_t config_descriptor_hs[] = {
    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, USB_BULK_EP_MPS_HS, 0x02),
};

static const uint8_t config_descriptor_fs[] = {
    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, USB_BULK_EP_MPS_FS, 0x02),
};

static const uint8_t device_quality_descriptor[] = {
    USB_DEVICE_QUALIFIER_DESCRIPTOR_INIT(USB_2_0, 0xEF, 0x02, 0x01, 0x01),
};

static const uint8_t other_speed_config_descriptor_hs[] = {
    USB_OTHER_SPEED_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, USB_BULK_EP_MPS_FS, 0x02),
};

static const uint8_t other_speed_config_descriptor_fs[] = {
    USB_OTHER_SPEED_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, USB_BULK_EP_MPS_HS, 0x02),
};

static const char *string_descriptors[] = {
    (const char[]){ 0x09, 0x04 }, /* Langid */
    "CherryUSB",                  /* Manufacturer */
    "CherryUSB CDC DEMO",         /* Product */
    "2024051702",                 /* Serial Number */
};

static const uint8_t *device_descriptor_callback(uint8_t speed)
{
    (void)speed;

    return device_descriptor;
}

static const uint8_t *config_descriptor_callback(uint8_t speed)
{
    if (speed == USB_SPEED_HIGH) {
        return config_descriptor_hs;
    } else if (speed == USB_SPEED_FULL) {
        return config_descriptor_fs;
    } else {
        return NULL;
    }
}

static const uint8_t *device_quality_descriptor_callback(uint8_t speed)
{
    (void)speed;

    return device_quality_descriptor;
}

static const uint8_t *other_speed_config_descriptor_callback(uint8_t speed)
{
    if (speed == USB_SPEED_HIGH) {
        return other_speed_config_descriptor_hs;
    } else if (speed == USB_SPEED_FULL) {
        return other_speed_config_descriptor_fs;
    } else {
        return NULL;
    }
}

static const char *string_descriptor_callback(uint8_t speed, uint8_t index)
{
    (void)speed;

    if (index >= (sizeof(string_descriptors) / sizeof(char *))) {
        return NULL;
    }
    return string_descriptors[index];
}

const struct usb_descriptor cdc_descriptor = {
    .device_descriptor_callback = device_descriptor_callback,
    .config_descriptor_callback = config_descriptor_callback,
    .device_quality_descriptor_callback = device_quality_descriptor_callback,
    .other_speed_descriptor_callback = other_speed_config_descriptor_callback,
    .string_descriptor_callback = string_descriptor_callback,
};

USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t read_buffer[16384];
USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t write_buffer[16384];

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:
            usbd_ep_start_read(busid, CDC_OUT_EP, read_buffer, sizeof(read_buffer));
            usbd_ep_start_write(busid, CDC_IN_EP, write_buffer, sizeof(write_buffer));
            break;
        case USBD_EVENT_SET_REMOTE_WAKEUP:
            break;
        case USBD_EVENT_CLR_REMOTE_WAKEUP:
            break;

        default:
            break;
    }
}

void usbd_cdc_acm_bulk_out(uint8_t busid, uint8_t ep, uint32_t nbytes)
{
    usbd_ep_start_read(busid, CDC_OUT_EP, read_buffer, sizeof(read_buffer));
}

void usbd_cdc_acm_bulk_in(uint8_t busid, uint8_t ep, uint32_t nbytes)
{
    usbd_ep_start_write(busid, CDC_IN_EP, write_buffer, sizeof(write_buffer));
}

/*!< 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
};

static struct usbd_interface intf0;
static struct usbd_interface intf1;

/* function ------------------------------------------------------------------*/

void cdc_acm_init(uint8_t busid, uint32_t reg_base)
{
    usbd_desc_register(busid, &cdc_descriptor);
    usbd_add_interface(busid, usbd_cdc_acm_init_intf(busid, &intf0));
    usbd_add_interface(busid, usbd_cdc_acm_init_intf(busid, &intf1));
    usbd_add_endpoint(busid, &cdc_out_ep);
    usbd_add_endpoint(busid, &cdc_in_ep);
    usbd_initialize(busid, reg_base, usbd_event_handler);
}