// SPDX-License-Identifier: GPL-3.0
/*
    Copyright 2021 0KIMS association.

    This file is generated with [snarkJS](https://github.com/iden3/snarkjs).

    snarkJS is a free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    snarkJS 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 General Public
    License for more details.

    You should have received a copy of the GNU General Public License
    along with snarkJS. If not, see <https://www.gnu.org/licenses/>.
*/

pragma solidity >=0.7.0 <0.9.0;

contract PUniversal2048V2Verifier2 {
    // Scalar field size
    uint256 constant r =
        21888242871839275222246405745257275088548364400416034343698204186575808495617;
    // Base field size
    uint256 constant q =
        21888242871839275222246405745257275088696311157297823662689037894645226208583;

    // Verification Key data
    uint256 constant alphax =
        20491192805390485299153009773594534940189261866228447918068658471970481763042;
    uint256 constant alphay =
        9383485363053290200918347156157836566562967994039712273449902621266178545958;
    uint256 constant betax1 =
        4252822878758300859123897981450591353533073413197771768651442665752259397132;
    uint256 constant betax2 =
        6375614351688725206403948262868962793625744043794305715222011528459656738731;
    uint256 constant betay1 =
        21847035105528745403288232691147584728191162732299865338377159692350059136679;
    uint256 constant betay2 =
        10505242626370262277552901082094356697409835680220590971873171140371331206856;
    uint256 constant gammax1 =
        11559732032986387107991004021392285783925812861821192530917403151452391805634;
    uint256 constant gammax2 =
        10857046999023057135944570762232829481370756359578518086990519993285655852781;
    uint256 constant gammay1 =
        4082367875863433681332203403145435568316851327593401208105741076214120093531;
    uint256 constant gammay2 =
        8495653923123431417604973247489272438418190587263600148770280649306958101930;
    uint256 constant deltax1 =
        6833881066242748577373850014007567212204887807947567238798375835663829839170;
    uint256 constant deltax2 =
        13753956907885689402843552171103051099169839435084233101741572143103767275589;
    uint256 constant deltay1 =
        7155568494723252382749081118521998120874529916230089972879597441667718707614;
    uint256 constant deltay2 =
        14827530425406262659340462692724778531659288748607761000317210434692792599569;

    uint256 constant IC0x =
        7277388006581425018334849594682704011610197406953670850730510424647982539089;
    uint256 constant IC0y =
        4775785510667152909210646298164570111792552279490608280645420850843771775808;

    uint256 constant IC1x =
        17760368878721985753153973432514956932060677034257966371593066551367698213795;
    uint256 constant IC1y =
        104650515301004830247290814085494800824847167602020508966482284686748134602;

    uint256 constant IC2x =
        7378860981750140214267264002621256410512797282088018937221289673812051314666;
    uint256 constant IC2y =
        21190202321221968481103869305874714946765844924898761294048696586232479614055;

    uint256 constant IC3x =
        18913792077572472344751926706389488685829272262204552382009291237896224683253;
    uint256 constant IC3y =
        10313821717729081709731250465509523406157318594120295365125355024370034242460;

    uint256 constant IC4x =
        14743191015280466715706164508697628385334310314564708382610609682348296646280;
    uint256 constant IC4y =
        19340936687761535844494448738104047376135335073078408554959296429434528799024;

    uint256 constant IC5x =
        19688151091830055478563722069435471568155751173843804033989050782143138619192;
    uint256 constant IC5y =
        5677421483621426349035375504132543395468156591916775574847791615705095462454;

    // Memory data
    uint16 constant pVk = 0;
    uint16 constant pPairing = 128;

    uint16 constant pLastMem = 896;

    function verifyProof(
        uint[2] calldata _pA,
        uint[2][2] calldata _pB,
        uint[2] calldata _pC,
        uint[5] calldata _pubSignals
    ) public view returns (bool) {
        assembly {
            function checkField(v) {
                if iszero(lt(v, q)) {
                    mstore(0, 0)
                    return(0, 0x20)
                }
            }

            // G1 function to multiply a G1 value(x,y) to value in an address
            function g1_mulAccC(pR, x, y, s) {
                let success
                let mIn := mload(0x40)
                mstore(mIn, x)
                mstore(add(mIn, 32), y)
                mstore(add(mIn, 64), s)

                success := staticcall(sub(gas(), 2000), 7, mIn, 96, mIn, 64)

                if iszero(success) {
                    mstore(0, 0)
                    return(0, 0x20)
                }

                mstore(add(mIn, 64), mload(pR))
                mstore(add(mIn, 96), mload(add(pR, 32)))

                success := staticcall(sub(gas(), 2000), 6, mIn, 128, pR, 64)

                if iszero(success) {
                    mstore(0, 0)
                    return(0, 0x20)
                }
            }

            function checkPairing(pA, pB, pC, pubSignals, pMem) -> isOk {
                let _pPairing := add(pMem, pPairing)
                let _pVk := add(pMem, pVk)

                mstore(_pVk, IC0x)
                mstore(add(_pVk, 32), IC0y)

                // Compute the linear combination vk_x

                g1_mulAccC(_pVk, IC1x, IC1y, calldataload(add(pubSignals, 0)))

                g1_mulAccC(_pVk, IC2x, IC2y, calldataload(add(pubSignals, 32)))

                g1_mulAccC(_pVk, IC3x, IC3y, calldataload(add(pubSignals, 64)))

                g1_mulAccC(_pVk, IC4x, IC4y, calldataload(add(pubSignals, 96)))

                g1_mulAccC(_pVk, IC5x, IC5y, calldataload(add(pubSignals, 128)))

                // -A
                mstore(_pPairing, calldataload(pA))
                mstore(add(_pPairing, 32), mod(sub(q, calldataload(add(pA, 32))), q))

                // B
                mstore(add(_pPairing, 64), calldataload(pB))
                mstore(add(_pPairing, 96), calldataload(add(pB, 32)))
                mstore(add(_pPairing, 128), calldataload(add(pB, 64)))
                mstore(add(_pPairing, 160), calldataload(add(pB, 96)))

                // alpha1
                mstore(add(_pPairing, 192), alphax)
                mstore(add(_pPairing, 224), alphay)

                // beta2
                mstore(add(_pPairing, 256), betax1)
                mstore(add(_pPairing, 288), betax2)
                mstore(add(_pPairing, 320), betay1)
                mstore(add(_pPairing, 352), betay2)

                // vk_x
                mstore(add(_pPairing, 384), mload(add(pMem, pVk)))
                mstore(add(_pPairing, 416), mload(add(pMem, add(pVk, 32))))

                // gamma2
                mstore(add(_pPairing, 448), gammax1)
                mstore(add(_pPairing, 480), gammax2)
                mstore(add(_pPairing, 512), gammay1)
                mstore(add(_pPairing, 544), gammay2)

                // C
                mstore(add(_pPairing, 576), calldataload(pC))
                mstore(add(_pPairing, 608), calldataload(add(pC, 32)))

                // delta2
                mstore(add(_pPairing, 640), deltax1)
                mstore(add(_pPairing, 672), deltax2)
                mstore(add(_pPairing, 704), deltay1)
                mstore(add(_pPairing, 736), deltay2)

                let success := staticcall(sub(gas(), 2000), 8, _pPairing, 768, _pPairing, 0x20)

                isOk := and(success, mload(_pPairing))
            }

            let pMem := mload(0x40)
            mstore(0x40, add(pMem, pLastMem))

            // Validate that all evaluations ∈ F

            checkField(calldataload(add(_pubSignals, 0)))

            checkField(calldataload(add(_pubSignals, 32)))

            checkField(calldataload(add(_pubSignals, 64)))

            checkField(calldataload(add(_pubSignals, 96)))

            checkField(calldataload(add(_pubSignals, 128)))

            checkField(calldataload(add(_pubSignals, 160)))

            // Validate all evaluations
            let isValid := checkPairing(_pA, _pB, _pC, _pubSignals, pMem)

            mstore(0, isValid)
            return(0, 0x20)
        }
    }
}