/* 
 * 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"
  #include "esp_log.h"
  #include "esp_partition.h"
  #include "esp_ota_ops.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

static const char* TAG = "DFU";

//--------------------------------------------------------------------+
// 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);

// used to download image onto OTA partition
esp_ota_handle_t ota_handle = 0;

//--------------------------------------------------------------------+
// 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);

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

  ESP_LOGI(TAG, "DFU mode");

  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)
  {
    // 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);
}

//--------------------------------------------------------------------+
// DFU callbacks
// Note: alt is used as the partition number, in order to support multiple partitions like FLASH, EEPROM, etc.
//--------------------------------------------------------------------+

// Invoked right before tud_dfu_download_cb() (state=DFU_DNBUSY) or tud_dfu_manifest_cb() (state=DFU_MANIFEST)
// Application return timeout in milliseconds (bwPollTimeout) for the next download/manifest operation.
// During this period, USB host won't try to communicate with us.
uint32_t tud_dfu_get_timeout_cb(uint8_t alt, uint8_t state)
{
  if ( state == DFU_DNBUSY )
  {
    return 3; // SPI flash Page Program Time 0.7-3 ms
  }
  else if (state == DFU_MANIFEST)
  {
    // since we don't buffer entire image and do any flashing in manifest stage
    return 0;
  }

  return 0;
}

// Invoked when received DFU_DNLOAD (wLength>0) following by DFU_GETSTATUS (state=DFU_DNBUSY) requests
// This callback could be returned before flashing op is complete (async).
// Once finished flashing, application must call tud_dfu_finish_flashing()
void tud_dfu_download_cb(uint8_t alt, uint16_t block_num, uint8_t const* data, uint16_t length)
{
  esp_err_t rc;
  ESP_LOGD(TAG, "download, alt=%u block=%u", alt, block_num);

  if (alt > 0)
  {
    ESP_LOGW(TAG, "download to invalid alt %u", alt);
    tud_dfu_finish_flashing(DFU_STATUS_ERR_ADDRESS);
    return;
  }

  // flashing op for download complete without error
  tud_dfu_finish_flashing(DFU_STATUS_OK);
}

// Invoked when download process is complete, received DFU_DNLOAD (wLength=0) following by DFU_GETSTATUS (state=Manifest)
// Application can do checksum, or actual flashing if buffered entire image previously.
// Once finished flashing, application must call tud_dfu_finish_flashing()
void tud_dfu_manifest_cb(uint8_t alt)
{
  (void) alt;
  esp_err_t rc;
  ESP_LOGI(TAG, "download completed, enter manifestation");

  // flashing op for manifest is complete without error
  // Application can perform checksum, should it fail, use appropriate status such as errVERIFY.
  tud_dfu_finish_flashing(DFU_STATUS_OK);
}

// Invoked when received DFU_UPLOAD request
// Application must populate data with up to length bytes and
// Return the number of written bytes
uint16_t tud_dfu_upload_cb(uint8_t alt, uint16_t block_num, uint8_t* data, uint16_t length)
{
  uint16_t xfer_len = 0;

  if (alt > 0) {
    ESP_LOGW(TAG, "upload unknown alt %u", alt);
    return 0;
  }

  ESP_LOGD(TAG, "upload, alt=%u block=%u", alt, block_num);
  const esp_partition_t * part  = esp_partition_find_first(ESP_PARTITION_TYPE_APP, ESP_PARTITION_SUBTYPE_APP_OTA_0, NULL);
  esp_err_t rc = esp_partition_read(part, block_num * CFG_TUD_DFU_XFER_BUFSIZE, data, length);
  if (ESP_OK == rc) {
    xfer_len = length;
  } else {
    xfer_len = 0;
    ESP_LOGW(TAG, "reading flash failed");
  }

  return xfer_len;
}

// Invoked when the Host has terminated a download or upload transfer
void tud_dfu_abort_cb(uint8_t alt)
{
  (void) alt;
  ESP_LOGI(TAG, "host aborted transfer");
}

// Invoked when a DFU_DETACH request is received
void tud_dfu_detach_cb(void)
{
  ESP_LOGI(TAG, "host detach -> reboot");
  esp_restart();
}

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