/**************************************************************************/
/*!
    @file     msc_uf2.c
    @author   hathach (tinyusb.org)

    @section LICENSE

    Software License Agreement (BSD License)

    Copyright (c) 2018, Adafruit Industries (adafruit.com)
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are met:
    1. Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.
    3. Neither the name of the copyright holders nor the
    names of its contributors may be used to endorse or promote products
    derived from this software without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
    EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**************************************************************************/

#include "msc_uf2.h"

#if CFG_TUD_MSC

#include "pstorage.h"

// for formatting fatfs when Softdevice is not enabled
#include "nrf_nvmc.h"


#define SECTORS_PER_FAT   7
#define ROOT_DIR_SECTOR   8

#define SECTOR_DATA       (1+SECTORS_PER_FAT+ROOT_DIR_SECTOR)

/*------------------------------------------------------------------*/
/* MACRO TYPEDEF CONSTANT ENUM
 *------------------------------------------------------------------*/
enum
{
  WRITE10_IDLE,
  WRITE10_ERASING,
  WRITE10_ERASED,
  WRITE10_WRITING,
  WRITE10_WRITTEN,
  WRITE10_FAILED
};

enum { FL_PAGE_SIZE = 4096 };

/*------------------------------------------------------------------*/
/* UF2
 *------------------------------------------------------------------*/
void read_block(uint32_t block_no, uint8_t *data);
int write_block(uint32_t block_no, uint8_t *data, bool quiet/*, WriteState *state*/);
void ghostfat_init();

/*------------------------------------------------------------------*/
/* VARIABLES
 *------------------------------------------------------------------*/
static uint8_t _page_cached[FL_PAGE_SIZE] ATTR_ALIGNED(4);

volatile static uint8_t _wr10_state;


static scsi_inquiry_data_t const mscd_inquiry_data =
{
    .is_removable         = 1,
    .version              = 2,
    .response_data_format = 2,
    .vendor_id            = "Adafruit",
    .product_id           = "Feather52840",
    .product_revision     = "1.0"
};

static scsi_read_capacity10_data_t const mscd_read_capacity10_data =
{
    .last_lba   = ENDIAN_BE(MSC_UF2_BLOCK_NUM-1), // read capacity
    .block_size = ENDIAN_BE(MSC_UF2_BLOCK_SIZE)
};

static scsi_sense_fixed_data_t mscd_sense_data =
{
    .response_code        = 0x70,
    .sense_key            = 0, // no errors
    .additional_sense_len = sizeof(scsi_sense_fixed_data_t) - 8
};

static scsi_read_format_capacity_data_t const mscd_format_capacity_data =
{
    .list_length     = 8,
    .block_num       = ENDIAN_BE(MSC_UF2_BLOCK_NUM), // write capacity
    .descriptor_type = 2, // TODO formatted media, refractor to const
    .block_size_u16  = ENDIAN_BE16(MSC_UF2_BLOCK_SIZE)
};

static scsi_mode_parameters_t const msc_dev_mode_para =
{
    .mode_data_length        = 3,
    .medium_type             = 0,
    .device_specific_para    = 0,
    .block_descriptor_length = 0
};

/*------------------------------------------------------------------*/
/*
 *------------------------------------------------------------------*/
static inline uint32_t lba2addr(uint32_t lba)
{
  return MSC_UF2_FLASH_ADDR_START + lba*MSC_UF2_BLOCK_SIZE;
}


/*------------------------------------------------------------------*/
/*
 *------------------------------------------------------------------*/

/*------------------------------------------------------------------*/
/* API
 *------------------------------------------------------------------*/
void msc_uf2_init(void)
{
  ghostfat_init();
}

void msc_uf2_mount(void)
{

}

void msc_uf2_umount(void)
{

}

//--------------------------------------------------------------------+
// tinyusb callbacks
//--------------------------------------------------------------------+
int32_t tud_msc_scsi_cb (uint8_t rhport, uint8_t lun, uint8_t const scsi_cmd[16], void* buffer, uint16_t bufsize)
{
  // read10 & write10 has their own callback and MUST not be handled here

  void const* ptr = NULL;
  uint16_t len = 0;

  // most scsi handled is input
  bool in_xfer = true;

  switch (scsi_cmd[0])
  {
    case SCSI_CMD_INQUIRY:
      ptr = &mscd_inquiry_data;
      len = sizeof(scsi_inquiry_data_t);
    break;

    case SCSI_CMD_READ_CAPACITY_10:
      ptr = &mscd_read_capacity10_data;
      len = sizeof(scsi_read_capacity10_data_t);
    break;

    case SCSI_CMD_REQUEST_SENSE:
      ptr = &mscd_sense_data;
      len = sizeof(scsi_sense_fixed_data_t);
    break;

    case SCSI_CMD_READ_FORMAT_CAPACITY:
      ptr = &mscd_format_capacity_data;
      len = sizeof(scsi_read_format_capacity_data_t);
    break;

    case SCSI_CMD_MODE_SENSE_6:
      ptr = &msc_dev_mode_para;
      len = sizeof(msc_dev_mode_para);
    break;

    case SCSI_CMD_TEST_UNIT_READY:
      ptr = NULL;
      len = 0;
    break;

    case SCSI_CMD_PREVENT_ALLOW_MEDIUM_REMOVAL:
      ptr = NULL;
      len = 0;
    break;

    default:
      // negative is error -> Data stage is STALL, status = failed
      return -1;
  }

  // return len must not larger than bufsize
  TU_ASSERT( bufsize >= len );

  if ( ptr && len )
  {
    if(in_xfer)
    {
      memcpy(buffer, ptr, len);
    }else
    {
      // SCSI output
    }
  }

  //------------- clear sense data if it is not request sense command -------------//
  if ( SCSI_CMD_REQUEST_SENSE != scsi_cmd[0] )
  {
    mscd_sense_data.sense_key                  = SCSI_SENSEKEY_NONE;
    mscd_sense_data.additional_sense_code      = 0;
    mscd_sense_data.additional_sense_qualifier = 0;
  }

  return len;
}

/*------------------------------------------------------------------*/
/* Tinyusb Flash READ10 & WRITE10
 *------------------------------------------------------------------*/


int32_t tud_msc_read10_cb (uint8_t rhport, uint8_t lun, uint32_t lba, uint32_t offset, void* buffer, uint32_t bufsize)
{
  (void) rhport; (void) lun;

  // since we return block size each, offset should always be zero
  TU_ASSERT(offset == 0, -1);

  uint32_t count = 0;

  while ( count < bufsize )
  {
    read_block(lba, buffer);

    lba++;
    buffer += 512;
    count  += 512;
  }

  return count;
}

int32_t tud_msc_write10_cb (uint8_t rhport, uint8_t lun, uint32_t lba, uint32_t offset, void* buffer, uint32_t bufsize)
{
  (void) rhport; (void) lun;

  uint32_t count = 0;
  int wr_ret;

  while ( (count < bufsize) && ((wr_ret = write_block(lba, buffer, false)) > 0) )
  {
    lba++;
    buffer += 512;
    count  += 512;
  }

  // Consider non-uf2 block write as successful
  return  (wr_ret < 0) ? bufsize : count;
}

#endif