/* 
 * 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"

#if TU_CHECK_MCU(OPT_MCU_ESP32S2, OPT_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"

  #define USBD_STACK_SIZE     4096
#else
  #include "FreeRTOS.h"
  #include "semphr.h"
  #include "queue.h"
  #include "task.h"
  #include "timers.h"

  // Increase stack size when debug log is enabled
  #define USBD_STACK_SIZE    (3*configMINIMAL_STACK_SIZE/2) * (CFG_TUSB_DEBUG ? 2 : 1)
#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
StackType_t  usb_device_stack[USBD_STACK_SIZE];
StaticTask_t usb_device_taskdef;

// static task for cdc
#define CDC_STACK_SZIE      configMINIMAL_STACK_SIZE
StackType_t  cdc_stack[CDC_STACK_SZIE];
StaticTask_t cdc_taskdef;


void led_blinky_cb(TimerHandle_t xTimer);
void usb_device_task(void* param);
void cdc_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 CDC task
  (void) xTaskCreateStatic( cdc_task, "cdc", CDC_STACK_SZIE, NULL, configMAX_PRIORITIES-2, cdc_stack, &cdc_taskdef);

  // skip starting scheduler (and return) for ESP32-S2 or ESP32-S3
#if !TU_CHECK_MCU(OPT_MCU_ESP32S2, OPT_MCU_ESP32S3)
  vTaskStartScheduler();
#endif

  return 0;
}

#if TU_CHECK_MCU(OPT_MCU_ESP32S2, 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)
  {
    // put this thread to waiting state until there is new events
    tud_task();

    // following code only run if tud_task() process at least 1 event
    tud_cdc_write_flush();
  }
}

//--------------------------------------------------------------------+
// 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 CDC
//--------------------------------------------------------------------+
void cdc_task(void* params)
{
  (void) params;

  // RTOS forever loop
  while ( 1 )
  {
    // connected() check for DTR bit
    // Most but not all terminal client set this when making connection
    // if ( tud_cdc_connected() )
    {
      // There are data available
      while ( tud_cdc_available() )
      {
        uint8_t buf[64];

        // read and echo back
        uint32_t count = tud_cdc_read(buf, sizeof(buf));
        (void) count;

        // Echo back
        // Note: Skip echo by commenting out write() and write_flush()
        // for throughput test e.g
        //    $ dd if=/dev/zero of=/dev/ttyACM0 count=10000
        tud_cdc_write(buf, count);
      }

      tud_cdc_write_flush();
    }

    // For ESP32-Sx this delay is essential to allow idle how to run and reset watchdog
    vTaskDelay(1);
  }
}

// Invoked when cdc when line state changed e.g connected/disconnected
void tud_cdc_line_state_cb(uint8_t itf, bool dtr, bool rts)
{
  (void) itf;
  (void) rts;

  // TODO set some indicator
  if ( dtr )
  {
    // Terminal connected
  }else
  {
    // Terminal disconnected
  }
}

// Invoked when CDC interface received data from host
void tud_cdc_rx_cb(uint8_t itf)
{
  (void) itf;
}

//--------------------------------------------------------------------+
// 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
}
