/*
  xdrv_52_3_berry_webserver.ino - Berry scripting language, webserver module

  Copyright (C) 2021 Stephan Hadinger, Berry language by Guan Wenliang https://github.com/Skiars/berry

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/


#ifdef USE_BERRY

#include <berry.h>
#include "esp_spi_flash.h"

/*********************************************************************************************\
 * Native functions mapped to Berry functions
 * 
 * import flash
 * 
\*********************************************************************************************/
extern "C" {
  // Berry: `flash.read(address:int[, length:int]) -> bytes()`
  //
  // If length is not specified, it is full block 4KB
  int32_t p_flash_read(struct bvm *vm);
  int32_t p_flash_read(struct bvm *vm) {
    int32_t argc = be_top(vm); // Get the number of arguments
    if (argc >= 1 && be_isint(vm, 1) && 
        (argc < 2 || be_isint(vm, 2)) ) {    // optional second argument must be int
      uint32_t address = be_toint(vm, 1);
      uint32_t length = 0x1000;
      if (argc >= 2) {
        length = be_toint(vm, 2);
        if (length <= 0) { length = 0x1000; }
      }
      // allocate a buffer in the heap that will be automatically freed when going out of scope
      auto buf = std::unique_ptr<uint8_t[]>(new uint8_t[length]);
      esp_err_t ret = spi_flash_read(address, buf.get(), length);
      if (ret)  {
        be_raise(vm, "internal_error", "Error calling spi_flash_read()");
      }
      be_pushbytes(vm, buf.get(), length);
      be_return(vm);
    }
    be_raise(vm, kTypeError, nullptr);
  }

  // Berry: `flash.write(address:int, content:bytes()) -> nil`
  //
  // If length is not specified, it is full block 4KB
  int32_t p_flash_write(struct bvm *vm);
  int32_t p_flash_write(struct bvm *vm) {
    int32_t argc = be_top(vm); // Get the number of arguments
    if (argc >= 2 && be_isint(vm, 1) && be_isinstance(vm, 2)) {
      be_getglobal(vm, "bytes"); /* get the bytes class */ /* TODO eventually replace with be_getbuiltin */
      if (be_isderived(vm, 2)) {
        uint32_t address = be_toint(vm, 1);
        size_t length = 0;
        const void * bytes = be_tobytes(vm, 2, &length);
        if (bytes && length > 0) {
          esp_err_t ret = spi_flash_write(address, bytes, length);
          if (ret)  {
            be_raise(vm, "internal_error", "Error calling spi_flash_read()");
          }
          be_return_nil(vm);
          // success
        }
      }
    }
    be_raise(vm, kTypeError, nullptr);
  }

  // Berry: `flash.erase(address:int, length:int) -> nil`
  //
  // Address and length must be 4KB aligned
  int32_t p_flash_erase(struct bvm *vm);
  int32_t p_flash_erase(struct bvm *vm) {
    int32_t argc = be_top(vm); // Get the number of arguments
    if (argc >= 2 && be_isint(vm, 1) && be_isint(vm, 2)) {
      int32_t address = be_toint(vm, 1);
      int32_t length = be_toint(vm, 2);
      if ((address % 0x1000) != 0 || address < 0) {
        be_raise(vm, "value_error", "Address must be a multiple of 0x1000");
      }
      if ((length % 0x1000) != 0 || length < 0) {
        be_raise(vm, "value_error", "Length must be a multiple of 0x1000");
      }
      esp_err_t ret = spi_flash_erase_range(address, length);
      be_return_nil(vm);
    }
    be_raise(vm, kTypeError, nullptr);
  }

}

#endif  // USE_BERRY