// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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.
import { toArrayBufferView } from './buffer';
import { BigIntAvailable, BigInt64Array, BigUint64Array } from './compat';
/** @ignore */
export const isArrowBigNumSymbol = Symbol.for('isArrowBigNum');
/** @ignore */
function BigNum(x, ...xs) {
    if (xs.length === 0) {
        return Object.setPrototypeOf(toArrayBufferView(this['TypedArray'], x), this.constructor.prototype);
    }
    return Object.setPrototypeOf(new this['TypedArray'](x, ...xs), this.constructor.prototype);
}
BigNum.prototype[isArrowBigNumSymbol] = true;
BigNum.prototype.toJSON = function () { return `"${bignumToString(this)}"`; };
BigNum.prototype.valueOf = function () { return bignumToNumber(this); };
BigNum.prototype.toString = function () { return bignumToString(this); };
BigNum.prototype[Symbol.toPrimitive] = function (hint = 'default') {
    switch (hint) {
        case 'number': return bignumToNumber(this);
        case 'string': return bignumToString(this);
        case 'default': return bignumToBigInt(this);
    }
    return bignumToString(this);
};
/** @ignore */
function SignedBigNum(...args) { return BigNum.apply(this, args); }
/** @ignore */
function UnsignedBigNum(...args) { return BigNum.apply(this, args); }
/** @ignore */
function DecimalBigNum(...args) { return BigNum.apply(this, args); }
Object.setPrototypeOf(SignedBigNum.prototype, Object.create(Int32Array.prototype));
Object.setPrototypeOf(UnsignedBigNum.prototype, Object.create(Uint32Array.prototype));
Object.setPrototypeOf(DecimalBigNum.prototype, Object.create(Uint32Array.prototype));
Object.assign(SignedBigNum.prototype, BigNum.prototype, { 'constructor': SignedBigNum, 'signed': true, 'TypedArray': Int32Array, 'BigIntArray': BigInt64Array });
Object.assign(UnsignedBigNum.prototype, BigNum.prototype, { 'constructor': UnsignedBigNum, 'signed': false, 'TypedArray': Uint32Array, 'BigIntArray': BigUint64Array });
Object.assign(DecimalBigNum.prototype, BigNum.prototype, { 'constructor': DecimalBigNum, 'signed': true, 'TypedArray': Uint32Array, 'BigIntArray': BigUint64Array });
/** @ignore */
function bignumToNumber(bn) {
    let { buffer, byteOffset, length, 'signed': signed } = bn;
    let words = new Int32Array(buffer, byteOffset, length);
    let number = 0, i = 0, n = words.length, hi, lo;
    while (i < n) {
        lo = words[i++];
        hi = words[i++];
        signed || (hi = hi >>> 0);
        number += (lo >>> 0) + (hi * (i ** 32));
    }
    return number;
}
/** @ignore */
export let bignumToString;
/** @ignore */
export let bignumToBigInt;
if (!BigIntAvailable) {
    bignumToString = decimalToString;
    bignumToBigInt = bignumToString;
}
else {
    bignumToBigInt = ((a) => a.byteLength === 8 ? new a['BigIntArray'](a.buffer, a.byteOffset, 1)[0] : decimalToString(a));
    bignumToString = ((a) => a.byteLength === 8 ? `${new a['BigIntArray'](a.buffer, a.byteOffset, 1)[0]}` : decimalToString(a));
}
/** @ignore */
function decimalToString(a) {
    let digits = '';
    let base64 = new Uint32Array(2);
    let base32 = new Uint16Array(a.buffer, a.byteOffset, a.byteLength / 2);
    let checks = new Uint32Array((base32 = new Uint16Array(base32).reverse()).buffer);
    let i = -1, n = base32.length - 1;
    do {
        for (base64[0] = base32[i = 0]; i < n;) {
            base32[i++] = base64[1] = base64[0] / 10;
            base64[0] = ((base64[0] - base64[1] * 10) << 16) + base32[i];
        }
        base32[i] = base64[1] = base64[0] / 10;
        base64[0] = base64[0] - base64[1] * 10;
        digits = `${base64[0]}${digits}`;
    } while (checks[0] || checks[1] || checks[2] || checks[3]);
    return digits ? digits : `0`;
}
/** @ignore */
export class BN {
    constructor(num, isSigned) {
        return BN.new(num, isSigned);
    }
    /** @nocollapse */
    static new(num, isSigned) {
        switch (isSigned) {
            case true: return new SignedBigNum(num);
            case false: return new UnsignedBigNum(num);
        }
        switch (num.constructor) {
            case Int8Array:
            case Int16Array:
            case Int32Array:
            case BigInt64Array:
                return new SignedBigNum(num);
        }
        if (num.byteLength === 16) {
            return new DecimalBigNum(num);
        }
        return new UnsignedBigNum(num);
    }
    /** @nocollapse */
    static signed(num) {
        return new SignedBigNum(num);
    }
    /** @nocollapse */
    static unsigned(num) {
        return new UnsignedBigNum(num);
    }
    /** @nocollapse */
    static decimal(num) {
        return new DecimalBigNum(num);
    }
}

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