/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2020 Ha Thach (tinyusb.org)
 * Copyright (c) 2020 Jerzy Kasenberg
 *
 * 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 "bsp/board_api.h"
#include "tusb.h"
#include "usb_descriptors.h"

// Unique PID per example: guarantees re-enumeration on re-flash and a fresh host driver match.
#define USB_PID           0x401a

//--------------------------------------------------------------------+
// Device Descriptors
//--------------------------------------------------------------------+
static tusb_desc_device_t const desc_device =
{
    .bLength            = sizeof(tusb_desc_device_t),
    .bDescriptorType    = TUSB_DESC_DEVICE,
    .bcdUSB             = 0x0200,

    // Use Interface Association Descriptor (IAD) for Audio
    // As required by USB Specs IAD's subclass must be common class (2) and protocol must be IAD (1)
    .bDeviceClass       = TUSB_CLASS_MISC,
    .bDeviceSubClass    = MISC_SUBCLASS_COMMON,
    .bDeviceProtocol    = MISC_PROTOCOL_IAD,
    .bMaxPacketSize0    = CFG_TUD_ENDPOINT0_SIZE,

    .idVendor           = 0xCafe,
    .idProduct          = USB_PID,
    .bcdDevice          = 0x0100,

    .iManufacturer      = 0x01,
    .iProduct           = 0x02,
    .iSerialNumber      = 0x03,

    .bNumConfigurations = 0x01
};

// Invoked when received GET DEVICE DESCRIPTOR
// Application return pointer to descriptor
uint8_t const * tud_descriptor_device_cb(void)
{
  return (uint8_t const *)&desc_device;
}

//--------------------------------------------------------------------+
// Configuration Descriptor
//--------------------------------------------------------------------+
#define CONFIG_TOTAL_LEN    	(TUD_CONFIG_DESC_LEN + CFG_TUD_AUDIO * TUD_AUDIO_HEADSET_STEREO_DESC_LEN)

#if CFG_TUSB_MCU == OPT_MCU_LPC175X_6X || CFG_TUSB_MCU == OPT_MCU_LPC177X_8X || CFG_TUSB_MCU == OPT_MCU_LPC40XX
  // LPC 17xx and 40xx endpoint type (bulk/interrupt/iso) are fixed by its number
  // 0 control, 1 In, 2 Bulk, 3 Iso, 4 In etc ...
  #define EPNUM_AUDIO_IN    0x03
  #define EPNUM_AUDIO_OUT   0x03
  #define EPNUM_AUDIO_INT   0x01

#elif CFG_TUSB_MCU == OPT_MCU_CXD56
  // CXD56 USB driver has fixed endpoint type (bulk/interrupt/iso) and direction (IN/OUT) by its number
  // 0 control (IN/OUT), 1 Bulk (IN), 2 Bulk (OUT), 3 In (IN), 4 Bulk (IN), 5 Bulk (OUT), 6 In (IN)
  #define EPNUM_AUDIO_IN    0x01
  #define EPNUM_AUDIO_OUT   0x02
  #define EPNUM_AUDIO_INT   0x03

#elif CFG_TUSB_MCU == OPT_MCU_NRF5X
  // ISO endpoints for NRF5x are fixed to 0x08 (0x88)
  #define EPNUM_AUDIO_IN    0x08
  #define EPNUM_AUDIO_OUT   0x08
  #define EPNUM_AUDIO_INT   0x01

#elif CFG_TUD_ENDPOINT_ONE_DIRECTION_ONLY
  // MCUs that don't support a same endpoint number with different direction IN and OUT defined in tusb_mcu.h
  //    e.g EP1 OUT & EP1 IN cannot exist together
  #if TU_CHECK_MCU(OPT_MCU_MAX32650, OPT_MCU_MAX32666, OPT_MCU_MAX32690, OPT_MCU_MAX78002)
    // Put audio iso on EP10/11 so the 4096-byte FIFOs can back double packet buffering
    #define EPNUM_AUDIO_OUT   0x0A
    #define EPNUM_AUDIO_IN    0x0B
    #define EPNUM_AUDIO_INT   0x01
  #elif TU_CHECK_MCU(OPT_MCU_PY32F0)
    // Speaker OUT (196 B) only fits EP1 (512 B FIFO); mic IN (98 B) fits EP2 (128 B)
    #define EPNUM_AUDIO_OUT   0x01
    #define EPNUM_AUDIO_IN    0x02
    #define EPNUM_AUDIO_INT   0x03
  #else
    #define EPNUM_AUDIO_IN    0x01
    #define EPNUM_AUDIO_OUT   0x02
    #define EPNUM_AUDIO_INT   0x03
  #endif

#else
  #define EPNUM_AUDIO_IN    0x01
  #define EPNUM_AUDIO_OUT   0x01
  #define EPNUM_AUDIO_INT   0x02
#endif

#define CONFIG_UAC1_TOTAL_LEN    	(TUD_CONFIG_DESC_LEN + TUD_AUDIO10_HEADSET_STEREO_DESC_LEN(2))

uint8_t const desc_uac1_configuration[] =
{
    // Config number, interface count, string index, total length, attribute, power in mA
    TUD_CONFIG_DESCRIPTOR(1, ITF_NUM_TOTAL, 0, CONFIG_UAC1_TOTAL_LEN, 0x00, 100),

    // Interface number, string index, bytes per sample RX/TX, bits used per sample RX/TX, EP Out & EP In address, EP sizes, sample rate
    TUD_AUDIO10_HEADSET_STEREO_DESCRIPTOR(ITF_NUM_AUDIO_CONTROL, 4, \
      CFG_TUD_AUDIO_FUNC_1_FORMAT_1_N_BYTES_PER_SAMPLE_RX, CFG_TUD_AUDIO_FUNC_1_FORMAT_1_RESOLUTION_RX, \
      CFG_TUD_AUDIO_FUNC_1_FORMAT_1_N_BYTES_PER_SAMPLE_TX, CFG_TUD_AUDIO_FUNC_1_FORMAT_1_RESOLUTION_TX, \
      EPNUM_AUDIO_OUT, CFG_TUD_AUDIO10_FUNC_1_FORMAT_1_EP_SZ_OUT, \
      EPNUM_AUDIO_IN | 0x80, CFG_TUD_AUDIO10_FUNC_1_FORMAT_1_EP_SZ_IN, \
      44100, 48000)
};

TU_VERIFY_STATIC(sizeof(desc_uac1_configuration) == CONFIG_UAC1_TOTAL_LEN, "Incorrect size");

#if TUD_OPT_HIGH_SPEED

#define CONFIG_UAC2_TOTAL_LEN    	(TUD_CONFIG_DESC_LEN + TUD_AUDIO20_HEADSET_STEREO_DESC_LEN)

uint8_t const desc_uac2_configuration[] =
{
    // Config number, interface count, string index, total length, attribute, power in mA
    TUD_CONFIG_DESCRIPTOR(1, ITF_NUM_TOTAL, 0, CONFIG_UAC2_TOTAL_LEN, 0x00, 100),

    // String index, EP Out & EP In address, EP Interrupt address
    TUD_AUDIO20_HEADSET_STEREO_DESCRIPTOR(5, EPNUM_AUDIO_OUT, EPNUM_AUDIO_IN | 0x80, EPNUM_AUDIO_INT | 0x80)
};

TU_VERIFY_STATIC(sizeof(desc_uac2_configuration) == CONFIG_UAC2_TOTAL_LEN, "Incorrect size");


// device qualifier is mostly similar to device descriptor since we don't change configuration based on speed
tusb_desc_device_qualifier_t const desc_device_qualifier =
{
  .bLength            = sizeof(tusb_desc_device_qualifier_t),
  .bDescriptorType    = TUSB_DESC_DEVICE_QUALIFIER,
  .bcdUSB             = 0x0200,

  .bDeviceClass       = TUSB_CLASS_MISC,
  .bDeviceSubClass    = MISC_SUBCLASS_COMMON,
  .bDeviceProtocol    = MISC_PROTOCOL_IAD,

  .bMaxPacketSize0    = CFG_TUD_ENDPOINT0_SIZE,
  .bNumConfigurations = 0x01,
  .bReserved          = 0x00
};

// Invoked when received GET DEVICE QUALIFIER DESCRIPTOR request
// Application return pointer to descriptor, whose contents must exist long enough for transfer to complete.
// device_qualifier descriptor describes information about a high-speed capable device that would
// change if the device were operating at the other speed. If not highspeed capable stall this request.
uint8_t const *tud_descriptor_device_qualifier_cb(void)
{
  return (uint8_t const *) &desc_device_qualifier;
}

// Invoked when received GET OTHER SEED CONFIGURATION DESCRIPTOR request
// Application return pointer to descriptor, whose contents must exist long enough for transfer to complete
// Configuration descriptor in the other speed e.g if high speed then this is for full speed and vice versa
uint8_t const *tud_descriptor_other_speed_configuration_cb(uint8_t index)
{
  (void) index; // for multiple configurations

  // if link speed is high return fullspeed config, and vice versa
  return (tud_speed_get() == TUSB_SPEED_HIGH) ? desc_uac1_configuration : desc_uac2_configuration;
}
#endif

// Invoked when received GET CONFIGURATION DESCRIPTOR
// Application return pointer to descriptor
// Descriptor contents must exist long enough for transfer to complete
uint8_t const * tud_descriptor_configuration_cb(uint8_t index)
{
  (void)index; // for multiple configurations
#if TUD_OPT_HIGH_SPEED
  // Although we are highspeed, host may be fullspeed.
  if(tud_speed_get() == TUSB_SPEED_FULL) {
    return desc_uac1_configuration;
  } else {
    return desc_uac2_configuration;
  }
#else
  return desc_uac1_configuration;
#endif
}

//--------------------------------------------------------------------+
// String Descriptors
//--------------------------------------------------------------------+

// String Descriptor Index
enum {
  STRID_LANGID = 0,
  STRID_MANUFACTURER,
  STRID_PRODUCT,
  STRID_SERIAL,
};

// array of pointer to string descriptors
static char const *string_desc_arr[] =
{
  (const char[]) { 0x09, 0x04 },  // 0: is supported language is English (0x0409)
  "TinyUSB",                      // 1: Manufacturer
  "TinyUSB Headset",              // 2: Product
  NULL,                           // 3: Serials will use unique ID if possible
  "TinyUSB UAC1 Headset",         // 4: Function
  "TinyUSB UAC2 Headset",         // 5: Function
};

static uint16_t _desc_str[32 + 1];

// Invoked when received GET STRING DESCRIPTOR request
// Application return pointer to descriptor, whose contents must exist long enough for transfer to complete
uint16_t const *tud_descriptor_string_cb(uint8_t index, uint16_t langid) {
  (void) langid;
  size_t chr_count;

  switch ( index ) {
    case STRID_LANGID:
      memcpy(&_desc_str[1], string_desc_arr[0], 2);
      chr_count = 1;
      break;

    case STRID_SERIAL:
      chr_count = board_usb_get_serial(_desc_str + 1, 32);
      break;

    default:
      // Note: the 0xEE index string is a Microsoft OS 1.0 Descriptors.
      // https://docs.microsoft.com/en-us/windows-hardware/drivers/usbcon/microsoft-defined-usb-descriptors

      if ( !(index < sizeof(string_desc_arr) / sizeof(string_desc_arr[0])) ) return NULL;

      const char *str = string_desc_arr[index];

      // Cap at max char
      chr_count = strlen(str);
      size_t const max_count = sizeof(_desc_str) / sizeof(_desc_str[0]) - 1; // -1 for string type
      if ( chr_count > max_count ) chr_count = max_count;

      // Convert ASCII string into UTF-16
      for ( size_t i = 0; i < chr_count; i++ ) {
        _desc_str[1 + i] = str[i];
      }
      break;
  }

  // first byte is length (including header), second byte is string type
  _desc_str[0] = (uint16_t) ((TUSB_DESC_STRING << 8) | (2 * chr_count + 2));

  return _desc_str;
}