// Js_of_ocaml runtime support
// http://www.ocsigen.org/js_of_ocaml/
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, with linking exception;
// either version 2.1 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

///////////// Sys

//Provides: caml_raise_sys_error (const)
//Requires: caml_raise_with_arg, caml_global_data, caml_string_of_jsstring
function caml_raise_sys_error(msg) {
  caml_raise_with_arg(caml_global_data.Sys_error, caml_string_of_jsstring(msg));
}

//Provides: caml_sys_exit
//Requires: caml_invalid_argument
//Alias: caml_unix_exit
//Alias: unix_exit
function caml_sys_exit(code) {
  if (globalThis.quit) globalThis.quit(code);
  //nodejs
  if (globalThis.process?.exit) globalThis.process.exit(code);
  caml_invalid_argument("Function 'exit' not implemented");
}

//Provides: caml_is_special_exception
function caml_is_special_exception(exn) {
  switch (exn[2]) {
    case -8: // Match_failure
    case -11: // Assert_failure
    case -12: // Undefined_recursive_module
      return 1;
    default:
      return 0;
  }
}

//Provides: caml_format_exception
//Requires: MlBytes, caml_is_special_exception
function caml_format_exception(exn) {
  var r = "";
  if (exn[0] === 0) {
    r += exn[1][1];
    if (
      exn.length === 3 &&
      exn[2][0] === 0 &&
      caml_is_special_exception(exn[1])
    ) {
      var bucket = exn[2];
      var start = 1;
    } else {
      var start = 2;
      var bucket = exn;
    }
    r += "(";
    for (var i = start; i < bucket.length; i++) {
      if (i > start) r += ", ";
      var v = bucket[i];
      if (typeof v === "number") r += v.toString();
      else if (v instanceof MlBytes) {
        r += '"' + v.toString() + '"';
      } else if (typeof v === "string") {
        r += '"' + v.toString() + '"';
      } else r += "_";
    }
    r += ")";
  } else if (exn[0] === 248) {
    r += exn[1];
  }
  return r;
}

//Provides: caml_fatal_uncaught_exception
//Requires: caml_named_value, caml_format_exception, caml_callback
function caml_fatal_uncaught_exception(err) {
  if (Array.isArray(err) && (err[0] === 0 || err[0] === 248)) {
    var handler = caml_named_value("Printexc.handle_uncaught_exception");
    if (handler) caml_callback(handler, [err, false]);
    else {
      var msg = caml_format_exception(err);
      var at_exit = caml_named_value("Pervasives.do_at_exit");
      if (at_exit) caml_callback(at_exit, [0]);
      console.error("Fatal error: exception " + msg);
      if (err.js_error) throw err.js_error;
    }
  } else {
    throw err;
  }
}

//Provides: jsoo_static_env
var jsoo_static_env = {};

//Provides: caml_set_static_env
//Requires: jsoo_static_env
function caml_set_static_env(k, v) {
  jsoo_static_env[k] = v;
  return 0;
}

//Provides: jsoo_sys_getenv (const)
//Requires: jsoo_static_env
function jsoo_sys_getenv(n) {
  if (jsoo_static_env[n]) return jsoo_static_env[n];
  var process = globalThis.process;
  //nodejs env
  if (process && process.env && process.env[n] !== undefined)
    return process.env[n];
  if (globalThis.jsoo_env && typeof globalThis.jsoo_env[n] === "string") {
    return globalThis.jsoo_env[n];
  }
}

//Provides: caml_sys_getenv (const)
//Requires: caml_raise_not_found
//Requires: caml_string_of_jsstring
//Requires: caml_jsstring_of_string
//Requires: jsoo_sys_getenv
function caml_sys_getenv(name) {
  var r = jsoo_sys_getenv(caml_jsstring_of_string(name));
  if (r === undefined) caml_raise_not_found();
  return caml_string_of_jsstring(r);
}

//Provides: caml_sys_getenv_opt (const)
//Requires: caml_string_of_jsstring
//Requires: caml_jsstring_of_string
//Requires: jsoo_sys_getenv
//Version: >= 5.4
function caml_sys_getenv_opt(name) {
  var r = jsoo_sys_getenv(caml_jsstring_of_string(name));
  if (r === undefined) return 0;
  return [0, caml_string_of_jsstring(r)];
}

//Provides: caml_sys_unsafe_getenv
//Requires: caml_sys_getenv
function caml_sys_unsafe_getenv(name) {
  return caml_sys_getenv(name);
}

//Provides: caml_argv
//Requires: caml_string_of_jsstring
var caml_argv = (function () {
  var process = globalThis.process;
  var main = "a.out";
  var args = [];

  if (process?.argv?.length > 1) {
    var argv = process.argv;
    //nodejs
    main = argv[1];
    args = argv.slice(2);
  }

  var p = caml_string_of_jsstring(main);
  var args2 = [0, p];
  for (var i = 0; i < args.length; i++)
    args2.push(caml_string_of_jsstring(args[i]));
  return args2;
})();

//Provides: caml_executable_name
//Requires: caml_argv
var caml_executable_name = caml_argv[1];

//Provides: caml_sys_get_argv
//Requires: caml_argv
function caml_sys_get_argv(_unit) {
  return [0, caml_argv[1], caml_argv];
}

//Provides: caml_sys_argv
//Requires: caml_argv
function caml_sys_argv(_unit) {
  return caml_argv;
}

//Provides: caml_sys_modify_argv
//Requires: caml_argv
function caml_sys_modify_argv(arg) {
  caml_argv = arg;
  return 0;
}

//Provides: caml_sys_executable_name const
//Requires: caml_executable_name
function caml_sys_executable_name(_unit) {
  return caml_executable_name;
}

//Provides: caml_sys_system_command
//Requires: caml_jsstring_of_string
function caml_sys_system_command(cmd) {
  var cmd = caml_jsstring_of_string(cmd);
  if (typeof require !== "undefined") {
    var child_process = require("node:child_process");
    if (child_process?.execSync)
      try {
        child_process.execSync(cmd, { stdio: "inherit" });
        return 0;
      } catch (e) {
        return 1;
      }
  } else return 127;
}

//Provides: caml_sys_system_command
//Requires: caml_jsstring_of_string
//If: browser
function caml_sys_system_command(_cmd) {
  return 127;
}

//Provides: caml_sys_time mutable
var caml_initial_time = new Date().getTime() * 0.001;
function caml_sys_time() {
  var now = new Date().getTime();
  return now * 0.001 - caml_initial_time;
}

//Provides: caml_sys_time_include_children
//Requires: caml_sys_time
function caml_sys_time_include_children(_b) {
  return caml_sys_time();
}

//Provides: caml_sys_random_seed mutable
//The function needs to return an array since OCaml 4.0...
function caml_sys_random_seed() {
  if (globalThis.crypto) {
    if (globalThis.crypto.getRandomValues) {
      var a = globalThis.crypto.getRandomValues(new Int32Array(4));
      return [0, a[0], a[1], a[2], a[3]];
    } else if (globalThis.crypto.randomBytes) {
      var a = new Int32Array(globalThis.crypto.randomBytes(16).buffer);
      return [0, a[0], a[1], a[2], a[3]];
    }
  }
  var now = new Date().getTime();
  var x = now ^ (0xffffffff * Math.random());
  return [0, x];
}

//Provides: caml_sys_const_big_endian const
function caml_sys_const_big_endian() {
  return 0;
}

//Provides: caml_sys_const_word_size const
function caml_sys_const_word_size() {
  return 32;
}

//Provides: caml_sys_const_int_size const
function caml_sys_const_int_size() {
  return 32;
}

//Provides: caml_sys_const_max_wosize const
// max_int / 4 so that the following does not overflow
//let max_string_length = word_size / 8 * max_array_length - 1;;
function caml_sys_const_max_wosize() {
  return (0x7fffffff / 4) | 0;
}

//Provides: caml_sys_const_ostype_unix const
//Requires: os_type
function caml_sys_const_ostype_unix() {
  return os_type === "Unix" ? 1 : 0;
}
//Provides: caml_sys_const_ostype_win32 const
//Requires: os_type
function caml_sys_const_ostype_win32() {
  return os_type === "Win32" ? 1 : 0;
}
//Provides: caml_sys_const_ostype_cygwin const
//Requires: os_type
function caml_sys_const_ostype_cygwin() {
  return os_type === "Cygwin" ? 1 : 0;
}

//Provides: caml_sys_const_backend_type const
//Requires: caml_string_of_jsbytes
function caml_sys_const_backend_type() {
  return [0, caml_string_of_jsbytes("js_of_ocaml")];
}

//Provides: os_type
//Requires: jsoo_is_win32
var os_type = jsoo_is_win32 ? "Win32" : "Unix";

//Provides: caml_sys_get_config const
//Requires: caml_string_of_jsbytes, os_type
function caml_sys_get_config() {
  return [0, caml_string_of_jsbytes(os_type), 32, 0];
}

//Provides: caml_sys_isatty
function caml_sys_isatty(_chan) {
  return 0;
}

//Provides: caml_runtime_variant
//Requires: caml_string_of_jsbytes
function caml_runtime_variant(_unit) {
  return caml_string_of_jsbytes("");
}
//Provides: caml_runtime_parameters
//Requires: caml_string_of_jsbytes
function caml_runtime_parameters(_unit) {
  return caml_string_of_jsbytes("");
}

//Provides: caml_install_signal_handler const
function caml_install_signal_handler() {
  return 0;
}

//Provides: caml_runtime_warnings
var caml_runtime_warnings = 0;

//Provides: caml_ml_enable_runtime_warnings
//Requires: caml_runtime_warnings
function caml_ml_enable_runtime_warnings(bool) {
  caml_runtime_warnings = bool;
  return 0;
}

//Provides: caml_ml_runtime_warnings_enabled
//Requires: caml_runtime_warnings
function caml_ml_runtime_warnings_enabled(_unit) {
  return caml_runtime_warnings;
}

//Provides: caml_sys_const_naked_pointers_checked const (const)
function caml_sys_const_naked_pointers_checked(_unit) {
  return 0;
}

//Provides: caml_xdg_defaults
//Version: >= 5.2
function caml_xdg_defaults(_unit) {
  return 0; // empty list
}

//Provides: caml_sys_is_regular_file
//Requires: resolve_fs_device
//Version: >= 5.1
function caml_sys_is_regular_file(name) {
  var root = resolve_fs_device(name);
  return root.device.isFile(root.rest);
}

//Provides: caml_io_buffer_size
var caml_io_buffer_size = 65536;

//Provides: caml_sys_io_buffer_size
//Requires: caml_io_buffer_size
//Version: >= 5.4
function caml_sys_io_buffer_size(_unit) {
  return caml_io_buffer_size;
}

//Provides: caml_sys_temp_dir_name
//Requires: os_type
//Requires: caml_string_of_jsstring
//Version: >= 5.4
function caml_sys_temp_dir_name(_unit) {
  if (os_type === "Win32") {
    return caml_string_of_jsstring(require("node:os").tmpdir());
  } else {
    return caml_string_of_jsstring("");
  }
}

//Provides: caml_sys_temp_dir_name
//Requires: caml_string_of_jsstring
//Version: >= 5.4
//If: browser
function caml_sys_temp_dir_name(_unit) {
  return caml_string_of_jsstring("");
}

//Provides: caml_sys_convert_signal_number
//Version: >= 5.4
function caml_sys_convert_signal_number(signo) {
  return signo;
}

//Provides: caml_sys_rev_convert_signal_number
//Version: >= 5.4
function caml_sys_rev_convert_signal_number(signo) {
  return signo;
}

//Always
//Requires: caml_fatal_uncaught_exception
//If: !wasm
function caml_setup_uncaught_exception_handler() {
  var process = globalThis.process;
  if (process?.on) {
    process.on("uncaughtException", function (err, origin) {
      caml_fatal_uncaught_exception(err);
      process.exit(2);
    });
  } else if (globalThis.addEventListener) {
    globalThis.addEventListener("error", function (event) {
      if (event.error) {
        caml_fatal_uncaught_exception(event.error);
      }
    });
  }
}
caml_setup_uncaught_exception_handler();
