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

/*!< endpoint address */
#define HID_INT_EP          0x81
#define HID_INT_EP_SIZE     4
#define HID_INT_EP_INTERVAL 1

#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 34
/*!< report descriptor size */
#define HID_MOUSE_REPORT_DESC_SIZE 74

static const uint8_t device_descriptor[] = {
    USB_DEVICE_DESCRIPTOR_INIT(USB_2_0, 0x00, 0x00, 0x00, USBD_VID, USBD_PID, 0x0002, 0x01)
};

static const uint8_t config_descriptor[] = {
    USB_CONFIG_DESCRIPTOR_INIT(USB_CONFIG_SIZE, 0x01, 0x01, USB_CONFIG_BUS_POWERED, USBD_MAX_POWER),
    HID_MOUSE_DESCRIPTOR_INIT(0x00, 0x01, HID_MOUSE_REPORT_DESC_SIZE, HID_INT_EP, HID_INT_EP_SIZE, HID_INT_EP_INTERVAL),
};

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 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 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
};

/*!< hid mouse report descriptor */
static const uint8_t hid_mouse_report_desc[HID_MOUSE_REPORT_DESC_SIZE] = {
    0x05, 0x01, // USAGE_PAGE (Generic Desktop)
    0x09, 0x02, // USAGE (Mouse)
    0xA1, 0x01, // COLLECTION (Application)
    0x09, 0x01, //   USAGE (Pointer)

    0xA1, 0x00, //   COLLECTION (Physical)
    0x05, 0x09, //     USAGE_PAGE (Button)
    0x19, 0x01, //     USAGE_MINIMUM (Button 1)
    0x29, 0x03, //     USAGE_MAXIMUM (Button 3)

    0x15, 0x00, //     LOGICAL_MINIMUM (0)
    0x25, 0x01, //     LOGICAL_MAXIMUM (1)
    0x95, 0x03, //     REPORT_COUNT (3)
    0x75, 0x01, //     REPORT_SIZE (1)

    0x81, 0x02, //     INPUT (Data,Var,Abs)
    0x95, 0x01, //     REPORT_COUNT (1)
    0x75, 0x05, //     REPORT_SIZE (5)
    0x81, 0x01, //     INPUT (Cnst,Var,Abs)

    0x05, 0x01, //     USAGE_PAGE (Generic Desktop)
    0x09, 0x30, //     USAGE (X)
    0x09, 0x31, //     USAGE (Y)
    0x09, 0x38,

    0x15, 0x81, //     LOGICAL_MINIMUM (-127)
    0x25, 0x7F, //     LOGICAL_MAXIMUM (127)
    0x75, 0x08, //     REPORT_SIZE (8)
    0x95, 0x03, //     REPORT_COUNT (2)

    0x81, 0x06, //     INPUT (Data,Var,Rel)
    0xC0, 0x09,
    0x3c, 0x05,
    0xff, 0x09,

    0x01, 0x15,
    0x00, 0x25,
    0x01, 0x75,
    0x01, 0x95,

    0x02, 0xb1,
    0x22, 0x75,
    0x06, 0x95,
    0x01, 0xb1,

    0x01, 0xc0 //   END_COLLECTION
};

/*!< mouse report struct */
struct hid_mouse {
    uint8_t buttons;
    int8_t x;
    int8_t y;
    int8_t wheel;
};

/*!< mouse report */
static USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX struct hid_mouse mouse_cfg;

#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;
    }
}

/* function ------------------------------------------------------------------*/
static void usbd_hid_int_callback(uint8_t busid, uint8_t ep, uint32_t nbytes)
{
    hid_state = HID_STATE_IDLE;
}

/*!< endpoint call back */
static struct usbd_endpoint hid_in_ep = {
    .ep_cb = usbd_hid_int_callback,
    .ep_addr = HID_INT_EP
};

struct usbd_interface intf0;

void hid_mouse_init(uint8_t busid, uintptr_t reg_base)
{
    usbd_desc_register(busid, &hid_descriptor);

    usbd_add_interface(busid, usbd_hid_init_intf(busid, &intf0, hid_mouse_report_desc, HID_MOUSE_REPORT_DESC_SIZE));
    usbd_add_endpoint(busid, &hid_in_ep);

    usbd_initialize(busid, reg_base, usbd_event_handler);

    /*!< init mouse report data */
    mouse_cfg.buttons = 0;
    mouse_cfg.wheel = 0;
    mouse_cfg.x = 0;
    mouse_cfg.y = 0;
}

#define CURSOR_STEP  2U
#define CURSOR_WIDTH 20U

void draw_circle(uint8_t *buf)
{
    static int32_t move_cnt = 0;
    static uint8_t step_x_y = 0;
    static int8_t x = 0, y = 0;

    move_cnt++;
    if (move_cnt > CURSOR_WIDTH) {
        step_x_y++;
        step_x_y = step_x_y % 4;
        move_cnt = 0;
    }
    switch (step_x_y) {
        case 0: {
            y = 0;
            x = CURSOR_STEP;

        } break;

        case 1: {
            x = 0;
            y = CURSOR_STEP;

        } break;

        case 2: {
            y = 0;
            x = (int8_t)(-CURSOR_STEP);

        } break;

        case 3: {
            x = 0;
            y = (int8_t)(-CURSOR_STEP);

        } break;
    }

    buf[0] = 0;
    buf[1] = x;
    buf[2] = y;
    buf[3] = 0;
}

/* https://cps-check.com/cn/polling-rate-check */
void hid_mouse_test(uint8_t busid)
{
    if(usb_device_is_configured(busid) == false) {
        return;
    }

    int counter = 0;
    while (counter < 1000) {
        draw_circle((uint8_t *)&mouse_cfg);
        hid_state = HID_STATE_BUSY;
        usbd_ep_start_write(busid, HID_INT_EP, (uint8_t *)&mouse_cfg, 4);
        while (hid_state == HID_STATE_BUSY) {
        }

        counter++;
    }
}