/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "builtin/BigInt.h"

#if JS_HAS_INTL_API
#  include "builtin/intl/GlobalIntlData.h"
#  include "builtin/intl/NumberFormat.h"
#endif
#include "jit/InlinableNatives.h"
#include "js/friend/ErrorMessages.h"  // js::GetErrorMessage, JSMSG_*
#include "js/PropertySpec.h"
#include "vm/BigIntType.h"

#include "vm/GeckoProfiler-inl.h"
#include "vm/JSObject-inl.h"

using namespace js;

static MOZ_ALWAYS_INLINE bool IsBigInt(HandleValue v) {
  return v.isBigInt() || (v.isObject() && v.toObject().is<BigIntObject>());
}

// BigInt proposal section 5.1.3
static bool BigIntConstructor(JSContext* cx, unsigned argc, Value* vp) {
  AutoJSConstructorProfilerEntry pseudoFrame(cx, "BigInt");
  CallArgs args = CallArgsFromVp(argc, vp);

  // Step 1.
  if (args.isConstructing()) {
    JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
                              JSMSG_NOT_CONSTRUCTOR, "BigInt");
    return false;
  }

  // Step 2.
  RootedValue v(cx, args.get(0));
  if (!ToPrimitive(cx, JSTYPE_NUMBER, &v)) {
    return false;
  }

  // Steps 3-4.
  BigInt* bi;
  if (!v.isNumber()) {
    bi = ToBigInt(cx, v);
  } else if (v.isInt32()) {
    bi = BigInt::createFromInt64(cx, int64_t(v.toInt32()));
  } else {
    bi = NumberToBigInt(cx, v.toDouble());
  }
  if (!bi) {
    return false;
  }

  args.rval().setBigInt(bi);
  return true;
}

JSObject* BigIntObject::create(JSContext* cx, HandleBigInt bigInt) {
  BigIntObject* bn = NewBuiltinClassInstance<BigIntObject>(cx);
  if (!bn) {
    return nullptr;
  }
  bn->initFixedSlot(PRIMITIVE_VALUE_SLOT, BigIntValue(bigInt));
  return bn;
}

BigInt* BigIntObject::unbox() const {
  return getFixedSlot(PRIMITIVE_VALUE_SLOT).toBigInt();
}

static BigInt* ThisBigIntValue(const CallArgs& args) {
  HandleValue thisv = args.thisv();
  MOZ_ASSERT(IsBigInt(thisv));

  return thisv.isBigInt() ? thisv.toBigInt()
                          : thisv.toObject().as<BigIntObject>().unbox();
}

/**
 * BigInt.prototype.valueOf ( )
 *
 * ES2025 draft rev e42d11da7753bd933b1e7a5f3cb657ab0a8f6251
 */
bool BigIntObject::valueOf_impl(JSContext* cx, const CallArgs& args) {
  // Step 1.
  args.rval().setBigInt(ThisBigIntValue(args));
  return true;
}

/**
 * BigInt.prototype.valueOf ( )
 *
 * ES2025 draft rev e42d11da7753bd933b1e7a5f3cb657ab0a8f6251
 */
bool BigIntObject::valueOf(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsBigInt, valueOf_impl>(cx, args);
}

/**
 * BigInt.prototype.toString ( [ radix ] )
 *
 * ES2025 draft rev e42d11da7753bd933b1e7a5f3cb657ab0a8f6251
 */
bool BigIntObject::toString_impl(JSContext* cx, const CallArgs& args) {
  // Step 1.
  RootedBigInt bi(cx, ThisBigIntValue(args));

  // Step 2.
  uint8_t radix = 10;

  // Steps 3-4.
  if (args.hasDefined(0)) {
    double d;
    if (!ToInteger(cx, args[0], &d)) {
      return false;
    }
    if (d < 2 || d > 36) {
      JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, JSMSG_BAD_RADIX);
      return false;
    }
    radix = d;
  }

  // Step 5.
  JSLinearString* str = BigInt::toString<CanGC>(cx, bi, radix);
  if (!str) {
    return false;
  }
  args.rval().setString(str);
  return true;
}

bool BigIntObject::toString(JSContext* cx, unsigned argc, Value* vp) {
  AutoJSMethodProfilerEntry pseudoFrame(cx, "BigInt.prototype", "toString");
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsBigInt, toString_impl>(cx, args);
}

/**
 * BigInt.prototype.toLocaleString ( [ reserved1 [ , reserved2 ] ] )
 *
 * ES2025 draft rev e42d11da7753bd933b1e7a5f3cb657ab0a8f6251
 *
 * BigInt.prototype.toLocaleString ( [ locales [ , options ] ] )
 *
 * ES2025 Intl draft rev 6827e6e40b45fb313472595be31352451a2d85fa
 */
bool BigIntObject::toLocaleString_impl(JSContext* cx, const CallArgs& args) {
  // Step 1.
  RootedBigInt bi(cx, ThisBigIntValue(args));

#if JS_HAS_INTL_API
  HandleValue locales = args.get(0);
  HandleValue options = args.get(1);

  // Step 2.
  Rooted<intl::NumberFormatObject*> numberFormat(
      cx, intl::GetOrCreateNumberFormat(cx, locales, options));
  if (!numberFormat) {
    return false;
  }

  // Step 3.
  JSString* str = intl::FormatBigInt(cx, numberFormat, bi);
  if (!str) {
    return false;
  }
  args.rval().setString(str);
  return true;
#else
  // This method is implementation-defined, and it is permissible, but not
  // encouraged, for it to return the same thing as toString.
  JSString* str = BigInt::toString<CanGC>(cx, bi, 10);
  if (!str) {
    return false;
  }
  args.rval().setString(str);
  return true;
#endif
}

bool BigIntObject::toLocaleString(JSContext* cx, unsigned argc, Value* vp) {
  AutoJSMethodProfilerEntry pseudoFrame(cx, "BigInt.prototype",
                                        "toLocaleString");
  CallArgs args = CallArgsFromVp(argc, vp);
  return CallNonGenericMethod<IsBigInt, toLocaleString_impl>(cx, args);
}

// BigInt proposal section 5.2.1. BigInt.asUintN ( bits, bigint )
bool BigIntObject::asUintN(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);

  // Step 1.
  uint64_t bits;
  if (!ToIndex(cx, args.get(0), &bits)) {
    return false;
  }

  // Step 2.
  RootedBigInt bi(cx, ToBigInt(cx, args.get(1)));
  if (!bi) {
    return false;
  }

  // Step 3.
  BigInt* res = BigInt::asUintN(cx, bi, bits);
  if (!res) {
    return false;
  }

  args.rval().setBigInt(res);
  return true;
}

// BigInt proposal section 5.2.2. BigInt.asIntN ( bits, bigint )
bool BigIntObject::asIntN(JSContext* cx, unsigned argc, Value* vp) {
  CallArgs args = CallArgsFromVp(argc, vp);

  // Step 1.
  uint64_t bits;
  if (!ToIndex(cx, args.get(0), &bits)) {
    return false;
  }

  // Step 2.
  RootedBigInt bi(cx, ToBigInt(cx, args.get(1)));
  if (!bi) {
    return false;
  }

  // Step 3.
  BigInt* res = BigInt::asIntN(cx, bi, bits);
  if (!res) {
    return false;
  }

  args.rval().setBigInt(res);
  return true;
}

const ClassSpec BigIntObject::classSpec_ = {
    GenericCreateConstructor<BigIntConstructor, 1, gc::AllocKind::FUNCTION,
                             &jit::JitInfo_BigInt>,
    GenericCreatePrototype<BigIntObject>,
    BigIntObject::staticMethods,
    nullptr,
    BigIntObject::methods,
    BigIntObject::properties,
};

const JSClass BigIntObject::class_ = {
    "BigInt",
    JSCLASS_HAS_CACHED_PROTO(JSProto_BigInt) |
        JSCLASS_HAS_RESERVED_SLOTS(RESERVED_SLOTS),
    JS_NULL_CLASS_OPS,
    &BigIntObject::classSpec_,
};

const JSClass BigIntObject::protoClass_ = {
    "BigInt.prototype",
    JSCLASS_HAS_CACHED_PROTO(JSProto_BigInt),
    JS_NULL_CLASS_OPS,
    &BigIntObject::classSpec_,
};

const JSPropertySpec BigIntObject::properties[] = {
    // BigInt proposal section 5.3.5
    JS_STRING_SYM_PS(toStringTag, "BigInt", JSPROP_READONLY),
    JS_PS_END,
};

const JSFunctionSpec BigIntObject::methods[] = {
    JS_FN("valueOf", valueOf, 0, 0),
    JS_FN("toString", toString, 0, 0),
    JS_FN("toLocaleString", toLocaleString, 0, 0),
    JS_FS_END,
};

const JSFunctionSpec BigIntObject::staticMethods[] = {
    JS_INLINABLE_FN("asUintN", asUintN, 2, 0, BigIntAsUintN),
    JS_INLINABLE_FN("asIntN", asIntN, 2, 0, BigIntAsIntN),
    JS_FS_END,
};