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/*
 * 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.
 */
package io.trino.server.security.jwt;

import java.math.BigInteger;
import java.security.spec.ECFieldFp;
import java.security.spec.ECParameterSpec;
import java.security.spec.ECPoint;
import java.security.spec.EllipticCurve;
import java.util.Optional;

final class EcCurve
{
    public static final ECParameterSpec P_256;
    public static final ECParameterSpec P_384;
    public static final ECParameterSpec P_521;

    private EcCurve() {}

    static {
        // Values obtained from org.bouncycastle.jce.ECNamedCurveTable (via Jose)

        P_256 = new ECParameterSpec(
                new EllipticCurve(
                        new ECFieldFp(new BigInteger("115792089210356248762697446949407573530086143415290314195533631308867097853951")),
                        new BigInteger("115792089210356248762697446949407573530086143415290314195533631308867097853948"),
                        new BigInteger("41058363725152142129326129780047268409114441015993725554835256314039467401291")),
                new ECPoint(
                        new BigInteger("48439561293906451759052585252797914202762949526041747995844080717082404635286"),
                        new BigInteger("36134250956749795798585127919587881956611106672985015071877198253568414405109")),
                new BigInteger("115792089210356248762697446949407573529996955224135760342422259061068512044369"),
                1);

        P_384 = new ECParameterSpec(
                new EllipticCurve(
                        new ECFieldFp(new BigInteger("39402006196394479212279040100143613805079739270465446667948293404245721771496870329047266088258938001861606973112319")),
                        new BigInteger("39402006196394479212279040100143613805079739270465446667948293404245721771496870329047266088258938001861606973112316"),
                        new BigInteger("27580193559959705877849011840389048093056905856361568521428707301988689241309860865136260764883745107765439761230575")),
                new ECPoint(
                        new BigInteger("26247035095799689268623156744566981891852923491109213387815615900925518854738050089022388053975719786650872476732087"),
                        new BigInteger("8325710961489029985546751289520108179287853048861315594709205902480503199884419224438643760392947333078086511627871")),
                new BigInteger("39402006196394479212279040100143613805079739270465446667946905279627659399113263569398956308152294913554433653942643"),
                1);

        P_521 = new ECParameterSpec(
                new EllipticCurve(
                        new ECFieldFp(new BigInteger(
                                "6864797660130609714981900799081393217269435300143305409394463459185543183397656052122559640661454554977296311391480858037121987999716643812574028291115057151")),
                        new BigInteger(
                                "6864797660130609714981900799081393217269435300143305409394463459185543183397656052122559640661454554977296311391480858037121987999716643812574028291115057148"),
                        new BigInteger(
                                "1093849038073734274511112390766805569936207598951683748994586394495953116150735016013708737573759623248592132296706313309438452531591012912142327488478985984")),
                new ECPoint(
                        new BigInteger(
                                "2661740802050217063228768716723360960729859168756973147706671368418802944996427808491545080627771902352094241225065558662157113545570916814161637315895999846"),
                        new BigInteger(
                                "3757180025770020463545507224491183603594455134769762486694567779615544477440556316691234405012945539562144444537289428522585666729196580810124344277578376784")),
                new BigInteger(
                        "6864797660130609714981900799081393217269435300143305409394463459185543183397655394245057746333217197532963996371363321113864768612440380340372808892707005449"),
                1);
    }

    public static Optional tryGet(String name)
    {
        if ("P-256".equals(name)) {
            return Optional.of(P_256);
        }
        if ("P-384".equals(name)) {
            return Optional.of(P_384);
        }
        if ("P-521".equals(name)) {
            return Optional.of(P_521);
        }
        return Optional.empty();
    }
}