/* 
 * The MIT License (MIT)
 *
 * Copyright (c) 2019 Ha Thach (tinyusb.org)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "bsp/board.h"
#include "tusb.h"
#include "usb_descriptors.h"

#if TU_CHECK_MCU(ESP32S2) || TU_CHECK_MCU(ESP32S3)
  // ESP-IDF need "freertos/" prefix in include path.
  // CFG_TUSB_OS_INC_PATH should be defined accordingly.
  #include "freertos/FreeRTOS.h"
  #include "freertos/semphr.h"
  #include "freertos/queue.h"
  #include "freertos/task.h"
  #include "freertos/timers.h"
#else
  #include "FreeRTOS.h"
  #include "semphr.h"
  #include "queue.h"
  #include "task.h"
  #include "timers.h"
#endif

//--------------------------------------------------------------------+
// MACRO CONSTANT TYPEDEF PROTYPES
//--------------------------------------------------------------------+

/* Blink pattern
 * - 250 ms  : device not mounted
 * - 1000 ms : device mounted
 * - 2500 ms : device is suspended
 */
enum  {
  BLINK_NOT_MOUNTED = 250,
  BLINK_MOUNTED = 1000,
  BLINK_SUSPENDED = 2500,
};

// static timer
StaticTimer_t blinky_tmdef;
TimerHandle_t blinky_tm;

// static task for usbd
#if CFG_TUSB_DEBUG
  #define USBD_STACK_SIZE     (3*configMINIMAL_STACK_SIZE)
#else
  #define USBD_STACK_SIZE     (3*configMINIMAL_STACK_SIZE/2)
#endif

StackType_t  usb_device_stack[USBD_STACK_SIZE];
StaticTask_t usb_device_taskdef;

// static task for hid
#define HID_STACK_SZIE      configMINIMAL_STACK_SIZE
StackType_t  hid_stack[HID_STACK_SZIE];
StaticTask_t hid_taskdef;


void led_blinky_cb(TimerHandle_t xTimer);
void usb_device_task(void* param);
void hid_task(void* params);

//--------------------------------------------------------------------+
// Main
//--------------------------------------------------------------------+

int main(void)
{
  board_init();

  // soft timer for blinky
  blinky_tm = xTimerCreateStatic(NULL, pdMS_TO_TICKS(BLINK_NOT_MOUNTED), true, NULL, led_blinky_cb, &blinky_tmdef);
  xTimerStart(blinky_tm, 0);

  // Create a task for tinyusb device stack
  (void) xTaskCreateStatic( usb_device_task, "usbd", USBD_STACK_SIZE, NULL, configMAX_PRIORITIES-1, usb_device_stack, &usb_device_taskdef);

  // Create HID task
  (void) xTaskCreateStatic( hid_task, "hid", HID_STACK_SZIE, NULL, configMAX_PRIORITIES-2, hid_stack, &hid_taskdef);

  // skip starting scheduler (and return) for ESP32-S2 or ESP32-S3
#if !( TU_CHECK_MCU(ESP32S2) || TU_CHECK_MCU(ESP32S3) )
  vTaskStartScheduler();
#endif

  return 0;
}

#if CFG_TUSB_MCU == OPT_MCU_ESP32S2 || CFG_TUSB_MCU == OPT_MCU_ESP32S3
void app_main(void)
{
  main();
}
#endif

// USB Device Driver task
// This top level thread process all usb events and invoke callbacks
void usb_device_task(void* param)
{
  (void) param;

  // This should be called after scheduler/kernel is started.
  // Otherwise it could cause kernel issue since USB IRQ handler does use RTOS queue API.
  tusb_init();

  // RTOS forever loop
  while (1)
  {
    // tinyusb device task
    tud_task();
  }
}

//--------------------------------------------------------------------+
// Device callbacks
//--------------------------------------------------------------------+

// Invoked when device is mounted
void tud_mount_cb(void)
{
  xTimerChangePeriod(blinky_tm, pdMS_TO_TICKS(BLINK_MOUNTED), 0);
}

// Invoked when device is unmounted
void tud_umount_cb(void)
{
  xTimerChangePeriod(blinky_tm, pdMS_TO_TICKS(BLINK_NOT_MOUNTED), 0);
}

// Invoked when usb bus is suspended
// remote_wakeup_en : if host allow us  to perform remote wakeup
// Within 7ms, device must draw an average of current less than 2.5 mA from bus
void tud_suspend_cb(bool remote_wakeup_en)
{
  (void) remote_wakeup_en;
  xTimerChangePeriod(blinky_tm, pdMS_TO_TICKS(BLINK_SUSPENDED), 0);
}

// Invoked when usb bus is resumed
void tud_resume_cb(void)
{
  xTimerChangePeriod(blinky_tm, pdMS_TO_TICKS(BLINK_MOUNTED), 0);
}

//--------------------------------------------------------------------+
// USB HID
//--------------------------------------------------------------------+

static void send_hid_report(uint8_t report_id, uint32_t btn)
{
  // skip if hid is not ready yet
  if ( !tud_hid_ready() ) return;

  switch(report_id)
  {
    case REPORT_ID_KEYBOARD:
    {
      // use to avoid send multiple consecutive zero report for keyboard
      static bool has_keyboard_key = false;

      if ( btn )
      {
        uint8_t keycode[6] = { 0 };
        keycode[0] = HID_KEY_A;

        tud_hid_keyboard_report(REPORT_ID_KEYBOARD, 0, keycode);
        has_keyboard_key = true;
      }else
      {
        // send empty key report if previously has key pressed
        if (has_keyboard_key) tud_hid_keyboard_report(REPORT_ID_KEYBOARD, 0, NULL);
        has_keyboard_key = false;
      }
    }
    break;

    case REPORT_ID_MOUSE:
    {
      int8_t const delta = 5;

      // no button, right + down, no scroll, no pan
      tud_hid_mouse_report(REPORT_ID_MOUSE, 0x00, delta, delta, 0, 0);
    }
    break;

    case REPORT_ID_CONSUMER_CONTROL:
    {
      // use to avoid send multiple consecutive zero report
      static bool has_consumer_key = false;

      if ( btn )
      {
        // volume down
        uint16_t volume_down = HID_USAGE_CONSUMER_VOLUME_DECREMENT;
        tud_hid_report(REPORT_ID_CONSUMER_CONTROL, &volume_down, 2);
        has_consumer_key = true;
      }else
      {
        // send empty key report (release key) if previously has key pressed
        uint16_t empty_key = 0;
        if (has_consumer_key) tud_hid_report(REPORT_ID_CONSUMER_CONTROL, &empty_key, 2);
        has_consumer_key = false;
      }
    }
    break;

    case REPORT_ID_GAMEPAD:
    {
      // use to avoid send multiple consecutive zero report for keyboard
      static bool has_gamepad_key = false;

      hid_gamepad_report_t report =
      {
        .x   = 0, .y = 0, .z = 0, .rz = 0, .rx = 0, .ry = 0,
        .hat = 0, .buttons = 0
      };

      if ( btn )
      {
        report.hat = GAMEPAD_HAT_UP;
        report.buttons = GAMEPAD_BUTTON_A;
        tud_hid_report(REPORT_ID_GAMEPAD, &report, sizeof(report));

        has_gamepad_key = true;
      }else
      {
        report.hat = GAMEPAD_HAT_CENTERED;
        report.buttons = 0;
        if (has_gamepad_key) tud_hid_report(REPORT_ID_GAMEPAD, &report, sizeof(report));
        has_gamepad_key = false;
      }
    }
    break;

    default: break;
  }
}

void hid_task(void* param)
{
  (void) param;

  while(1)
  {
    // Poll every 10ms
    vTaskDelay(pdMS_TO_TICKS(10));

    uint32_t const btn = board_button_read();

    // Remote wakeup
    if ( tud_suspended() && btn )
    {
      // Wake up host if we are in suspend mode
      // and REMOTE_WAKEUP feature is enabled by host
      tud_remote_wakeup();
    }
    else
    {
      // Send the 1st of report chain, the rest will be sent by tud_hid_report_complete_cb()
      send_hid_report(REPORT_ID_KEYBOARD, btn);
    }
  }
}

// Invoked when sent REPORT successfully to host
// Application can use this to send the next report
// Note: For composite reports, report[0] is report ID
void tud_hid_report_complete_cb(uint8_t instance, uint8_t const* report, uint8_t len)
{
  (void) instance;
  (void) len;

  uint8_t next_report_id = report[0] + 1;

  if (next_report_id < REPORT_ID_COUNT)
  {
    send_hid_report(next_report_id, board_button_read());
  }
}


// Invoked when received GET_REPORT control request
// Application must fill buffer report's content and return its length.
// Return zero will cause the stack to STALL request
uint16_t tud_hid_get_report_cb(uint8_t instance, uint8_t report_id, hid_report_type_t report_type, uint8_t* buffer, uint16_t reqlen)
{
  // TODO not Implemented
  (void) instance;
  (void) report_id;
  (void) report_type;
  (void) buffer;
  (void) reqlen;

  return 0;
}

// Invoked when received SET_REPORT control request or
// received data on OUT endpoint ( Report ID = 0, Type = 0 )
void tud_hid_set_report_cb(uint8_t instance, uint8_t report_id, hid_report_type_t report_type, uint8_t const* buffer, uint16_t bufsize)
{
  (void) instance;

  if (report_type == HID_REPORT_TYPE_OUTPUT)
  {
    // Set keyboard LED e.g Capslock, Numlock etc...
    if (report_id == REPORT_ID_KEYBOARD)
    {
      // bufsize should be (at least) 1
      if ( bufsize < 1 ) return;

      uint8_t const kbd_leds = buffer[0];

      if (kbd_leds & KEYBOARD_LED_CAPSLOCK)
      {
        // Capslock On: disable blink, turn led on
        xTimerStop(blinky_tm, portMAX_DELAY);
        board_led_write(true);
      }else
      {
        // Caplocks Off: back to normal blink
        board_led_write(false);
        xTimerStart(blinky_tm, portMAX_DELAY);
      }
    }
  }
}

//--------------------------------------------------------------------+
// BLINKING TASK
//--------------------------------------------------------------------+
void led_blinky_cb(TimerHandle_t xTimer)
{
  (void) xTimer;
  static bool led_state = false;

  board_led_write(led_state);
  led_state = 1 - led_state; // toggle
}
