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

#define WEBUSB_VENDOR_CODE (0x22)
#define WINUSB_VENDOR_CODE (0x21)

#define URL_DESCRIPTOR_LENGTH    (3 + 36)

#define WEBUSB_INTF_NUM 0x01

#define WEBUSB_URL_STRINGS                                 \
    'g', 'i', 't', 'h', 'u', 'b', '.', 'c', 'o', 'm', '/', \
        'c', 'h', 'e', 'r', 'r', 'y', '-', 'e', 'm', 'b', 'e', 'd', 'd', 'e', 'd', '/', 'C', 'h', 'e', 'r', 'r', 'y', 'U', 'S', 'B',

const uint8_t USBD_WebUSBURLDescriptor[URL_DESCRIPTOR_LENGTH] = {
    URL_DESCRIPTOR_LENGTH,
    WEBUSB_URL_TYPE,
    WEBUSB_URL_SCHEME_HTTPS,
    WEBUSB_URL_STRINGS
};

const uint8_t WINUSB_WCIDDescriptor[] = {
    USB_MSOSV2_COMP_ID_SET_HEADER_DESCRIPTOR_INIT(10 + USB_MSOSV2_COMP_ID_FUNCTION_WINUSB_MULTI_DESCRIPTOR_LEN),
    USB_MSOSV2_COMP_ID_FUNCTION_WINUSB_MULTI_DESCRIPTOR_INIT(WEBUSB_INTF_NUM),
};

__ALIGN_BEGIN const uint8_t USBD_BinaryObjectStoreDescriptor[] = {
    USB_BOS_HEADER_DESCRIPTOR_INIT(5 + USB_BOS_CAP_PLATFORM_WEBUSB_DESCRIPTOR_LEN + USB_BOS_CAP_PLATFORM_WINUSB_DESCRIPTOR_LEN, 2),
    USB_BOS_CAP_PLATFORM_WEBUSB_DESCRIPTOR_INIT(WEBUSB_VENDOR_CODE, 0x01),
    USB_BOS_CAP_PLATFORM_WINUSB_DESCRIPTOR_INIT(WINUSB_VENDOR_CODE, sizeof(WINUSB_WCIDDescriptor)),
};

struct usb_webusb_descriptor webusb_url_desc = {
    .vendor_code = WEBUSB_VENDOR_CODE,
    .string = USBD_WebUSBURLDescriptor,
    .string_len = URL_DESCRIPTOR_LENGTH
};

struct usb_msosv2_descriptor msosv2_desc = {
    .vendor_code = WINUSB_VENDOR_CODE,
    .compat_id = WINUSB_WCIDDescriptor,
    .compat_id_len = sizeof(WINUSB_WCIDDescriptor),
};

struct usb_bos_descriptor bos_desc = {
    .string = USBD_BinaryObjectStoreDescriptor,
    .string_len = sizeof(USBD_BinaryObjectStoreDescriptor)
};

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

#define HID_INT_EP          0x81
#define HID_INT_EP_SIZE     8
#define HID_INT_EP_INTERVAL 10

#define USB_CONFIG_SIZE       (34 + 9)
#define HID_KEYBOARD_REPORT_DESC_SIZE 63

static const uint8_t device_descriptor[] = {
    USB_DEVICE_DESCRIPTOR_INIT(USB_2_1, 0x00, 0x00, 0x00, USBD_VID, USBD_PID, 0x0002, 0x01)
};

static const uint8_t config_descriptor[] = {
    USB_CONFIG_DESCRIPTOR_INIT(USB_CONFIG_SIZE, 0x02, 0x01, USB_CONFIG_BUS_POWERED, USBD_MAX_POWER),
    HID_KEYBOARD_DESCRIPTOR_INIT(0x00, 0x01, HID_KEYBOARD_REPORT_DESC_SIZE, HID_INT_EP, HID_INT_EP_SIZE, HID_INT_EP_INTERVAL),
    USB_INTERFACE_DESCRIPTOR_INIT(WEBUSB_INTF_NUM, 0x00, 0x00, 0xff, 0x00, 0x00, 0x00)
};

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 WEBUSB HID 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 > 3) {
        return NULL;
    }
    return string_descriptors[index];
}

const struct usb_descriptor webusb_hid_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,
    .msosv2_descriptor = &msosv2_desc,
    .webusb_url_descriptor = &webusb_url_desc,
    .bos_descriptor = &bos_desc
};

/* USB HID device Configuration Descriptor */
static uint8_t hid_desc[9] __ALIGN_END = {
    /* 18 */
    0x09,                    /* bLength: HID Descriptor size */
    HID_DESCRIPTOR_TYPE_HID, /* bDescriptorType: HID */
    0x11,                    /* bcdHID: HID Class Spec release number */
    0x01,
    0x00,                          /* bCountryCode: Hardware target country */
    0x01,                          /* bNumDescriptors: Number of HID class descriptors to follow */
    0x22,                          /* bDescriptorType */
    HID_KEYBOARD_REPORT_DESC_SIZE, /* wItemLength: Total length of Report descriptor */
    0x00,
};

static const uint8_t hid_keyboard_report_desc[HID_KEYBOARD_REPORT_DESC_SIZE] = {
    0x05, 0x01, // USAGE_PAGE (Generic Desktop)
    0x09, 0x06, // USAGE (Keyboard)
    0xa1, 0x01, // COLLECTION (Application)
    0x05, 0x07, // USAGE_PAGE (Keyboard)
    0x19, 0xe0, // USAGE_MINIMUM (Keyboard LeftControl)
    0x29, 0xe7, // USAGE_MAXIMUM (Keyboard Right GUI)
    0x15, 0x00, // LOGICAL_MINIMUM (0)
    0x25, 0x01, // LOGICAL_MAXIMUM (1)
    0x75, 0x01, // REPORT_SIZE (1)
    0x95, 0x08, // REPORT_COUNT (8)
    0x81, 0x02, // INPUT (Data,Var,Abs)
    0x95, 0x01, // REPORT_COUNT (1)
    0x75, 0x08, // REPORT_SIZE (8)
    0x81, 0x03, // INPUT (Cnst,Var,Abs)
    0x95, 0x05, // REPORT_COUNT (5)
    0x75, 0x01, // REPORT_SIZE (1)
    0x05, 0x08, // USAGE_PAGE (LEDs)
    0x19, 0x01, // USAGE_MINIMUM (Num Lock)
    0x29, 0x05, // USAGE_MAXIMUM (Kana)
    0x91, 0x02, // OUTPUT (Data,Var,Abs)
    0x95, 0x01, // REPORT_COUNT (1)
    0x75, 0x03, // REPORT_SIZE (3)
    0x91, 0x03, // OUTPUT (Cnst,Var,Abs)
    0x95, 0x06, // REPORT_COUNT (6)
    0x75, 0x08, // REPORT_SIZE (8)
    0x15, 0x00, // LOGICAL_MINIMUM (0)
    0x25, 0xFF, // LOGICAL_MAXIMUM (255)
    0x05, 0x07, // USAGE_PAGE (Keyboard)
    0x19, 0x00, // USAGE_MINIMUM (Reserved (no event indicated))
    0x29, 0x65, // USAGE_MAXIMUM (Keyboard Application)
    0x81, 0x00, // INPUT (Data,Ary,Abs)
    0xc0        // END_COLLECTION
};

#define HID_STATE_IDLE 0
#define HID_STATE_BUSY 1

/*!< hid state ! Data can be sent only when state is idle  */
static volatile uint8_t hid_state = HID_STATE_IDLE;

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:
            hid_state = HID_STATE_IDLE;
            break;
        case USBD_EVENT_SET_REMOTE_WAKEUP:
            break;
        case USBD_EVENT_CLR_REMOTE_WAKEUP:
            break;

        default:
            break;
    }
}

void usbd_hid_int_callback(uint8_t busid, uint8_t ep, uint32_t nbytes)
{
    hid_state = HID_STATE_IDLE;
}

static struct usbd_endpoint hid_in_ep = {
    .ep_cb = usbd_hid_int_callback,
    .ep_addr = HID_INT_EP
};

static struct usbd_interface intf0;

void webusb_hid_keyboard_init(uint8_t busid, uintptr_t reg_base)
{
    usbd_desc_register(busid, &webusb_hid_descriptor);

    usbd_add_interface(busid, usbd_hid_init_intf(busid, &intf0, hid_keyboard_report_desc, HID_KEYBOARD_REPORT_DESC_SIZE));
    usbd_add_endpoint(busid, &hid_in_ep);

    usbd_initialize(busid, reg_base, usbd_event_handler);
}

USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t write_buffer[64];

void hid_keyboard_test(uint8_t busid)
{
    const uint8_t sendbuffer[8] = { 0x00, 0x00, HID_KBD_USAGE_A, 0x00, 0x00, 0x00, 0x00, 0x00 };

    if (usb_device_is_configured(busid) == false) {
        return;
    }

    memcpy(write_buffer, sendbuffer, 8);
    hid_state = HID_STATE_BUSY;
    usbd_ep_start_write(busid, HID_INT_EP, write_buffer, 8);
    while (hid_state == HID_STATE_BUSY) {
    }
}