//: Allow mu programs to log facts just like we've been doing in C++ so far.

:(scenario trace)
recipe main [
  trace 1, [foo], [this is a trace in mu]
]
+foo: this is a trace in mu

:(before "End Primitive Recipe Declarations")
TRACE,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "trace", TRACE);
:(before "End Primitive Recipe Checks")
case TRACE: {
  if (SIZE(inst.ingredients) < 3) {
    raise << maybe(get(Recipe, r).name) << "'trace' takes three or more ingredients rather than '" << to_string(inst) << "'\n" << end();
    break;
  }
  if (!is_mu_number(inst.ingredients.at(0))) {
    raise << maybe(get(Recipe, r).name) << "first ingredient of 'trace' should be a number (depth), but got " << inst.ingredients.at(0).original_string << '\n' << end();
    break;
  }
  if (!is_literal_string(inst.ingredients.at(1))) {
    raise << maybe(get(Recipe, r).name) << "second ingredient of 'trace' should be a literal string (label), but got " << inst.ingredients.at(1).original_string << '\n' << end();
    break;
  }
  break;
}
:(before "End Primitive Recipe Implementations")
case TRACE: {
  long long int depth = ingredients.at(0).at(0);
  string label = current_instruction().ingredients.at(1).name;
  ostringstream out;
  for (long long int i = 2; i < SIZE(current_instruction().ingredients); ++i) {
    out << print_mu(current_instruction().ingredients.at(i), ingredients.at(i));
  }
  trace(depth, label) << out.str() << end();
  break;
}

//: simpler limited version of 'trace'

:(before "End Primitive Recipe Declarations")
STASH,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "stash", STASH);
:(before "End Primitive Recipe Checks")
case STASH: {
  break;
}
:(before "End Primitive Recipe Implementations")
case STASH: {
  ostringstream out;
  for (long long int i = 0; i < SIZE(current_instruction().ingredients); ++i) {
    out << print_mu(current_instruction().ingredients.at(i), ingredients.at(i));
  }
  trace(2, "app") << out.str() << end();
  break;
}

:(scenario stash_literal_string)
recipe main [
  stash [foo]
]
+app: foo

:(scenario stash_literal_number)
recipe main [
  stash [foo:], 4
]
+app: foo: 4

:(scenario stash_number)
recipe main [
  1:number <- copy 34
  stash [foo:], 1:number
]
+app: foo: 34

:(code)
string print_mu(const reagent& r, const vector<double>& data) {
  if (is_literal(r))
    return r.name+' ';
  // End print Special-cases(reagent r, data)
  ostringstream out;
  for (long long i = 0; i < SIZE(data); ++i)
    out << no_scientific(data.at(i)) << ' ';
  return out.str();
}

:(before "End Primitive Recipe Declarations")
HIDE_ERRORS,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "hide-errors", HIDE_ERRORS);
:(before "End Primitive Recipe Checks")
case HIDE_ERRORS: {
  break;
}
:(before "End Primitive Recipe Implementations")
case HIDE_ERRORS: {
  Hide_errors = true;
  break;
}

:(before "End Primitive Recipe Declarations")
SHOW_ERRORS,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "show-errors", SHOW_ERRORS);
:(before "End Primitive Recipe Checks")
case SHOW_ERRORS: {
  break;
}
:(before "End Primitive Recipe Implementations")
case SHOW_ERRORS: {
  Hide_errors = false;
  break;
}

:(before "End Primitive Recipe Declarations")
TRACE_UNTIL,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "trace-until", TRACE_UNTIL);
:(before "End Primitive Recipe Checks")
case TRACE_UNTIL: {
  break;
}
:(before "End Primitive Recipe Implementations")
case TRACE_UNTIL: {
  if (Trace_stream) {
    Trace_stream->collect_depth = ingredients.at(0).at(0);
  }
  break;
}

:(before "End Primitive Recipe Declarations")
_DUMP_TRACE,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "$dump-trace", _DUMP_TRACE);
:(before "End Primitive Recipe Checks")
case _DUMP_TRACE: {
  break;
}
:(before "End Primitive Recipe Implementations")
case _DUMP_TRACE: {
  if (ingredients.empty()) {
    DUMP("");
  }
  else {
    DUMP(current_instruction().ingredients.at(0).name);
  }
  break;
}

:(before "End Primitive Recipe Declarations")
_CLEAR_TRACE,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "$clear-trace", _CLEAR_TRACE);
:(before "End Primitive Recipe Checks")
case _CLEAR_TRACE: {
  break;
}
:(before "End Primitive Recipe Implementations")
case _CLEAR_TRACE: {
  if (Trace_stream) Trace_stream->past_lines.clear();
  break;
}

:(before "End Primitive Recipe Declarations")
_SAVE_TRACE,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "$save-trace", _SAVE_TRACE);
:(before "End Primitive Recipe Checks")
case _SAVE_TRACE: {
  break;
}
:(before "End Primitive Recipe Implementations")
case _SAVE_TRACE: {
  if (!Trace_file.empty()) {
    ofstream fout((Trace_dir+Trace_file).c_str());
    fout << Trace_stream->readable_contents("");
    fout.close();
  }
  break;
}

//: assert: perform sanity checks at runtime

:(scenario assert)
% Hide_errors = true;  // '%' lines insert arbitrary C code into tests before calling 'run' with the lines below. Must be immediately after :(scenario) line.
recipe main [
  assert 0, [this is an assert in mu]
]
+error: this is an assert in mu

:(before "End Primitive Recipe Declarations")
ASSERT,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "assert", ASSERT);
:(before "End Primitive Recipe Checks")
case ASSERT: {
  if (SIZE(inst.ingredients) != 2) {
    raise << maybe(get(Recipe, r).name) << "'assert' takes exactly two ingredients rather than '" << to_string(inst) << "'\n" << end();
    break;
  }
  if (!is_mu_scalar(inst.ingredients.at(0))) {
    raise << maybe(get(Recipe, r).name) << "'assert' requires a boolean for its first ingredient, but got " << inst.ingredients.at(0).original_string << '\n' << end();
    break;
  }
  if (!is_literal_string(inst.ingredients.at(1))) {
    raise << maybe(get(Recipe, r).name) << "'assert' requires a literal string for its second ingredient, but got " << inst.ingredients.at(1).original_string << '\n' << end();
    break;
  }
  break;
}
:(before "End Primitive Recipe Implementations")
case ASSERT: {
  if (!ingredients.at(0).at(0)) {
    raise << current_instruction().ingredients.at(1).name << '\n' << end();
  }
  break;
}

//:: 'cheating' by using the host system

:(before "End Primitive Recipe Declarations")
_PRINT,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "$print", _PRINT);
:(before "End Primitive Recipe Checks")
case _PRINT: {
  break;
}
:(before "End Primitive Recipe Implementations")
case _PRINT: {
  for (long long int i = 0; i < SIZE(ingredients); ++i) {
    if (is_literal(current_instruction().ingredients.at(i))) {
      trace(9998, "run") << "$print: " << current_instruction().ingredients.at(i).name << end();
      if (has_property(current_instruction().ingredients.at(i), "newline"))
        cout << '\n';
      else
        cout << current_instruction().ingredients.at(i).name;
    }
    else {
      for (long long int j = 0; j < SIZE(ingredients.at(i)); ++j) {
        trace(9998, "run") << "$print: " << ingredients.at(i).at(j) << end();
        if (j > 0) cout << " ";
        cout << no_scientific(ingredients.at(i).at(j));
      }
    }
  }
  cout.flush();
  break;
}

:(before "End Primitive Recipe Declarations")
_EXIT,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "$exit", _EXIT);
:(before "End Primitive Recipe Checks")
case _EXIT: {
  break;
}
:(before "End Primitive Recipe Implementations")
case _EXIT: {
  exit(0);
  break;
}

:(before "End Primitive Recipe Declarations")
_SYSTEM,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "$system", _SYSTEM);
:(before "End Primitive Recipe Checks")
case _SYSTEM: {
  if (SIZE(inst.ingredients) != 1) {
    raise << maybe(get(Recipe, r).name) << "'$system' requires exactly one ingredient, but got none\n" << end();
    break;
  }
  break;
}
:(before "End Primitive Recipe Implementations")
case _SYSTEM: {
  int status = system(current_instruction().ingredients.at(0).name.c_str());
  products.resize(1);
  products.at(0).push_back(status);
  break;
}

:(before "End Primitive Recipe Declarations")
_DUMP_MEMORY,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "$dump-memory", _DUMP_MEMORY);
:(before "End Primitive Recipe Checks")
case _DUMP_MEMORY: {
  break;
}
:(before "End Primitive Recipe Implementations")
case _DUMP_MEMORY: {
  dump_memory();
  break;
}

//: In times of real extremis we need to create a whole new modality for debug
//: logs, independent of other changes to the screen or Trace_stream.

:(before "End Globals")
ofstream LOG;
:(before "End One-time Setup")
//? LOG.open("log");

:(before "End Primitive Recipe Declarations")
_LOG,
:(before "End Primitive Recipe Numbers")
put(Recipe_ordinal, "$log", _LOG);
:(before "End Primitive Recipe Checks")
case _LOG: {
  break;
}
:(before "End Primitive Recipe Implementations")
case _LOG: {
  ostringstream out;
  for (long long int i = 0; i < SIZE(current_instruction().ingredients); ++i) {
    out << print_mu(current_instruction().ingredients.at(i), ingredients.at(i));
  }
  LOG << out.str() << '\n';
  break;
}