// Copyright 2022 Bradley D. Nelson
//
// 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.

static char filename[PATH_MAX];

{{bits}}
{{core}}
{{interp}}
{{boot}}

// Work around lack of ftruncate
static cell_t ResizeFile(cell_t fd, cell_t size) {
  struct stat st;
  char buf[256];
  cell_t t = fstat(fd, &st);
  if (t < 0) { return errno; }
  if (size < st.st_size) {
    // TODO: Implement truncation
    return ENOSYS;
  }
  cell_t oldpos = lseek(fd, 0, SEEK_CUR);
  if (oldpos < 0) { return errno; }
  t = lseek(fd, 0, SEEK_END);
  if (t < 0) { return errno; }
  memset(buf, 0, sizeof(buf));
  while (st.st_size < size) {
    cell_t len = sizeof(buf);
    if (size - st.st_size < len) {
      len = size - st.st_size;
    }
    t = write(fd, buf, len);
    if (t != len) {
      return errno;
    }
    st.st_size += t;
  }
  t = lseek(fd, oldpos, SEEK_SET);
  if (t < 0) { return errno; }
  return 0;
}

#ifdef ENABLE_INTERRUPTS_SUPPORT
struct handle_interrupt_args {
  cell_t xt;
  cell_t arg;
};

static void IRAM_ATTR HandleInterrupt(void *arg) {
  struct handle_interrupt_args *args = (struct handle_interrupt_args *) arg;
  cell_t code[2];
  code[0] = args->xt;
  code[1] = g_sys->YIELD_XT;
  cell_t fstack[INTERRUPT_STACK_CELLS];
  cell_t rstack[INTERRUPT_STACK_CELLS];
  cell_t stack[INTERRUPT_STACK_CELLS];
  stack[0] = args->arg;
  cell_t *rp = rstack;
  *++rp = (cell_t) (fstack + 1);
  *++rp = (cell_t) (stack + 1);
  *++rp = (cell_t) code;
  forth_run(rp);
}

static cell_t EspIntrAlloc(cell_t source, cell_t flags, cell_t xt, cell_t arg, void *ret) {
  // NOTE: Leaks memory.
  struct handle_interrupt_args *args = (struct handle_interrupt_args *) malloc(sizeof(struct handle_interrupt_args));
  args->xt = xt;
  args->arg = arg;
  return esp_intr_alloc(source, flags, HandleInterrupt, args, (intr_handle_t *) ret);
}

static cell_t GpioIsrHandlerAdd(cell_t pin, cell_t xt, cell_t arg) {
  // NOTE: Leaks memory.
  struct handle_interrupt_args *args = (struct handle_interrupt_args *) malloc(sizeof(struct handle_interrupt_args));
  args->xt = xt;
  args->arg = arg;
  return gpio_isr_handler_add((gpio_num_t) pin, HandleInterrupt, args);
}

static cell_t TimerIsrRegister(cell_t group, cell_t timer, cell_t xt, cell_t arg, cell_t flags, void *ret) {
  // NOTE: Leaks memory.
  struct handle_interrupt_args *args = (struct handle_interrupt_args *) malloc(sizeof(struct handle_interrupt_args));
  args->xt = xt;
  args->arg = arg;
  return timer_isr_register((timer_group_t) group, (timer_idx_t) timer, HandleInterrupt, args, flags, (timer_isr_handle_t *) ret);
}
#endif