// Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#pragma once

#include "soc/soc_caps.h"
#if SOC_USB_OTG_SUPPORTED

#include "sdkconfig.h"
#if CONFIG_TINYUSB_CDC_ENABLED

#include <inttypes.h>
#include "esp_event.h"
#include "freertos/FreeRTOS.h"
#include "freertos/queue.h"
#include "freertos/semphr.h"
#include "Stream.h"

ESP_EVENT_DECLARE_BASE(ARDUINO_USB_CDC_EVENTS);

typedef enum {
  ARDUINO_USB_CDC_ANY_EVENT = ESP_EVENT_ANY_ID,
  ARDUINO_USB_CDC_CONNECTED_EVENT = 0,
  ARDUINO_USB_CDC_DISCONNECTED_EVENT,
  ARDUINO_USB_CDC_LINE_STATE_EVENT,
  ARDUINO_USB_CDC_LINE_CODING_EVENT,
  ARDUINO_USB_CDC_RX_EVENT,
  ARDUINO_USB_CDC_TX_EVENT,
  ARDUINO_USB_CDC_RX_OVERFLOW_EVENT,
  ARDUINO_USB_CDC_MAX_EVENT,
} arduino_usb_cdc_event_t;

typedef union {
  struct {
    bool dtr;
    bool rts;
  } line_state;
  struct {
    uint32_t bit_rate;
    uint8_t stop_bits;  ///< 0: 1 stop bit - 1: 1.5 stop bits - 2: 2 stop bits
    uint8_t parity;     ///< 0: None - 1: Odd - 2: Even - 3: Mark - 4: Space
    uint8_t data_bits;  ///< can be 5, 6, 7, 8 or 16
  } line_coding;
  struct {
    size_t len;
  } rx;
  struct {
    size_t dropped_bytes;
  } rx_overflow;
} arduino_usb_cdc_event_data_t;

class USBCDC : public Stream {
public:
  USBCDC(uint8_t itf = 0);
  ~USBCDC();

  void onEvent(esp_event_handler_t callback);
  void onEvent(arduino_usb_cdc_event_t event, esp_event_handler_t callback);

  size_t setRxBufferSize(size_t size);
  void setTxTimeoutMs(uint32_t timeout);
  void begin(unsigned long baud = 0);
  void end();

  int available(void);
  int availableForWrite(void);
  int peek(void);
  int read(void);
  size_t read(uint8_t *buffer, size_t size);
  size_t write(uint8_t);
  size_t write(const uint8_t *buffer, size_t size);
  void flush(void);

  inline size_t read(char *buffer, size_t size) {
    return read((uint8_t *)buffer, size);
  }
  inline size_t write(const char *buffer, size_t size) {
    return write((uint8_t *)buffer, size);
  }
  inline size_t write(const char *s) {
    return write((uint8_t *)s, strlen(s));
  }
  inline size_t write(unsigned long n) {
    return write((uint8_t)n);
  }
  inline size_t write(long n) {
    return write((uint8_t)n);
  }
  inline size_t write(unsigned int n) {
    return write((uint8_t)n);
  }
  inline size_t write(int n) {
    return write((uint8_t)n);
  }
  uint32_t baudRate();
  void setDebugOutput(bool);
  operator bool() const;

  void enableReboot(bool enable);
  bool rebootEnabled(void);

  //internal methods
  void _onDFU(void);
  void _onLineState(bool _dtr, bool _rts);
  void _onLineCoding(uint32_t _bit_rate, uint8_t _stop_bits, uint8_t _parity, uint8_t _data_bits);
  void _onRX(void);
  void _onTX(void);
  void _onUnplugged(void);

protected:
  uint8_t itf;
  uint32_t bit_rate;
  uint8_t stop_bits;  ///< 0: 1 stop bit - 1: 1.5 stop bits - 2: 2 stop bits
  uint8_t parity;     ///< 0: None - 1: Odd - 2: Even - 3: Mark - 4: Space
  uint8_t data_bits;  ///< can be 5, 6, 7, 8 or 16
  bool dtr;
  bool rts;
  bool connected;
  bool reboot_enable;
  QueueHandle_t rx_queue;
  SemaphoreHandle_t tx_lock;
  uint32_t tx_timeout_ms;
};

#if !ARDUINO_USB_MODE && ARDUINO_USB_CDC_ON_BOOT  // Native USB CDC selected
#ifndef USB_SERIAL_IS_DEFINED
#define USB_SERIAL_IS_DEFINED 1
#endif
// USBSerial is always available to be used
extern USBCDC USBSerial;
#endif

#endif /* CONFIG_TINYUSB_CDC_ENABLED */
#endif /* SOC_USB_OTG_SUPPORTED */