/* 
 * 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"

//--------------------------------------------------------------------+
// MACRO CONSTANT TYPEDEF PROTYPES
//--------------------------------------------------------------------+
void print_greeting(void);
void led_blinking_task(void);

extern void cdc_task(void);
extern void hid_task(void);

/*------------- MAIN -------------*/
int main(void)
{
  board_init();
  print_greeting();

  tusb_init();

  while (1)
  {
    // tinyusb host task
    tuh_task();

    led_blinking_task();

#if CFG_TUH_CDC
    cdc_task();
#endif

#if CFG_TUH_HID_KEYBOARD || CFG_TUH_HID_MOUSE
    hid_task();
#endif
  }

  return 0;
}

//--------------------------------------------------------------------+
// USB CDC
//--------------------------------------------------------------------+
#if CFG_TUH_CDC
CFG_TUSB_MEM_SECTION static char serial_in_buffer[64] = { 0 };

void tuh_mount_cb(uint8_t dev_addr)
{
  // application set-up
  printf("A device with address %d is mounted\r\n", dev_addr);

  tuh_cdc_receive(dev_addr, serial_in_buffer, sizeof(serial_in_buffer), true); // schedule first transfer
}

void tuh_umount_cb(uint8_t dev_addr)
{
  // application tear-down
  printf("A device with address %d is unmounted \r\n", dev_addr);
}

// invoked ISR context
void tuh_cdc_xfer_isr(uint8_t dev_addr, xfer_result_t event, cdc_pipeid_t pipe_id, uint32_t xferred_bytes)
{
  (void) event;
  (void) pipe_id;
  (void) xferred_bytes;

  printf(serial_in_buffer);
  tu_memclr(serial_in_buffer, sizeof(serial_in_buffer));

  tuh_cdc_receive(dev_addr, serial_in_buffer, sizeof(serial_in_buffer), true); // waiting for next data
}

void cdc_task(void)
{

}

#endif

//--------------------------------------------------------------------+
// USB HID
//--------------------------------------------------------------------+
#if CFG_TUH_HID_KEYBOARD

uint8_t const keycode2ascii[128][2] =  { HID_KEYCODE_TO_ASCII };

// look up new key in previous keys
static inline bool find_key_in_report(hid_keyboard_report_t const *p_report, uint8_t keycode)
{
  for(uint8_t i=0; i<6; i++)
  {
    if (p_report->keycode[i] == keycode)  return true;
  }

  return false;
}

static inline void process_kbd_report(hid_keyboard_report_t const *p_new_report)
{
  static hid_keyboard_report_t prev_report = { 0, 0, {0} }; // previous report to check key released

  //------------- example code ignore control (non-printable) key affects -------------//
  for(uint8_t i=0; i<6; i++)
  {
    if ( p_new_report->keycode[i] )
    {
      if ( find_key_in_report(&prev_report, p_new_report->keycode[i]) )
      {
        // exist in previous report means the current key is holding
      }else
      {
        // not existed in previous report means the current key is pressed
        bool const is_shift =  p_new_report->modifier & (KEYBOARD_MODIFIER_LEFTSHIFT | KEYBOARD_MODIFIER_RIGHTSHIFT);
        uint8_t ch = keycode2ascii[p_new_report->keycode[i]][is_shift ? 1 : 0];
        putchar(ch);
        if ( ch == '\r' ) putchar('\n'); // added new line for enter key
      }
    }
    // TODO example skips key released
  }

  prev_report = *p_new_report;
}

CFG_TUSB_MEM_SECTION static hid_keyboard_report_t usb_keyboard_report;

void hid_task(void)
{
  uint8_t const addr = 1;
  if ( tuh_hid_keyboard_is_mounted(addr) )
  {
    if ( !tuh_hid_keyboard_is_busy(addr) )
    {
      process_kbd_report(&usb_keyboard_report);
      tuh_hid_keyboard_get_report(addr, &usb_keyboard_report);
    }
  }
}

void tuh_hid_keyboard_mounted_cb(uint8_t dev_addr)
{
  // application set-up
  printf("A Keyboard device (address %d) is mounted\r\n", dev_addr);

  tuh_hid_keyboard_get_report(dev_addr, &usb_keyboard_report);
}

void tuh_hid_keyboard_unmounted_cb(uint8_t dev_addr)
{
  // application tear-down
  printf("A Keyboard device (address %d) is unmounted\r\n", dev_addr);
}

// invoked ISR context
void tuh_hid_keyboard_isr(uint8_t dev_addr, xfer_result_t event)
{

}

#endif

#if CFG_TUH_HID_MOUSE
void tuh_hid_mouse_mounted_cb(uint8_t dev_addr)
{
  // application set-up
  printf("A Mouse device (address %d) is mounted\r\n", dev_addr);
}

void tuh_hid_mouse_unmounted_cb(uint8_t dev_addr)
{
  // application tear-down
  printf("A Mouse device (address %d) is unmounted\r\n", dev_addr);
}

// invoked ISR context
void tuh_hid_mouse_isr(uint8_t dev_addr, xfer_result_t event)
{
}
#endif

//--------------------------------------------------------------------+
// tinyusb callbacks
//--------------------------------------------------------------------+

//--------------------------------------------------------------------+
// BLINKING TASK
//--------------------------------------------------------------------+
void led_blinking_task(void)
{
  const uint32_t interval_ms = 1000;
  static uint32_t start_ms = 0;

  static bool led_state = false;

  // Blink every interval ms
  if ( board_millis() - start_ms < interval_ms) return; // not enough time
  start_ms += interval_ms;

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

//--------------------------------------------------------------------+
// HELPER FUNCTION
//--------------------------------------------------------------------+
void print_greeting(void)
{
  char const * const rtos_name[] =
  {
      [OPT_OS_NONE]      = "None",
      [OPT_OS_FREERTOS]  = "FreeRTOS",
  };

  printf("--------------------------------------------------------------------\r\n");
  printf("- Host example\r\n");
  printf("- if you find any bugs or get any questions, feel free to file an\r\n");
  printf("- issue at https://github.com/hathach/tinyusb\r\n");
  printf("--------------------------------------------------------------------\r\n\r\n");

  printf("This Host demo is configured to support:\r\n");
  printf("  - RTOS = %s\r\n", rtos_name[CFG_TUSB_OS]);

#if CFG_TUH_CDC
  printf("  - Communication Device Class\r\n");
#endif

#if CFG_TUH_MSC
  printf("  - Mass Storage\r\n");
#endif

//  if (CFG_TUH_HID_KEYBOARD ) puts("  - HID Keyboard");
//  if (CFG_TUH_HID_MOUSE    ) puts("  - HID Mouse");
}