/*
    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.
*/

/* Test MPIN - test driver and function exerciser for MPIN API Functions */

var CTX = require("../index");

var chai = require('chai');

var expect = chai.expect;

var pf_curves = ['BN254', 'BN254CX', 'BLS381', 'BLS383', 'BLS461', 'FP256BN', 'FP512BN', 'BLS24', 'BLS48'];

pf_curves.forEach(function(curve) {

    describe('TEST PAIR ' + curve, function() {

        var ctx = new CTX(curve),
            rng = new ctx.RAND(),
            r = new ctx.BIG(0),
            G = ctx.ECP.generator(),
            G1 = new ctx.ECP(0),
            G2 = new ctx.ECP(0),
            Gaux = new ctx.ECP(0);

        // Set curve order
        r.rcopy(ctx.ROM_CURVE.CURVE_Order);

        if (ctx.ECP.CURVE_PAIRING_TYPE === 1 | ctx.ECP.CURVE_PAIRING_TYPE === 2) {
            var Q = ctx.ECP2.generator(),
                Q1 = new ctx.ECP2(0),
                Q2 = new ctx.ECP2(0),
                Qaux = new ctx.ECP2(0),
                g11 = new ctx.FP12(0),
                g12 = new ctx.FP12(0),
                g21 = new ctx.FP12(0),
                g22 = new ctx.FP12(0),
                g1s = new ctx.FP12(0),
                gs1 = new ctx.FP12(0),
                aux1 = new ctx.FP12(0),
                aux2 = new ctx.FP12(0);

            // Set pairing interface
            var PAIR = ctx.PAIR;

        } else if (ctx.ECP.CURVE_PAIRING_TYPE === 3) {
            var Q = ctx.ECP4.generator(),
                Q1 = new ctx.ECP4(0),
                Q2 = new ctx.ECP4(0),
                Qaux = new ctx.ECP4(0),

                g11 = new ctx.FP24(0),
                g22 = new ctx.FP24(0),
                g1s = new ctx.FP24(0),
                gs1 = new ctx.FP24(0),
                aux1 = new ctx.FP24(0),
                aux2 = new ctx.FP24(0);

            // Set pairing interface
            var PAIR = ctx.PAIR192;

        } else if (ctx.ECP.CURVE_PAIRING_TYPE === 4) {
            var Q = ctx.ECP8.generator(),
                Q1 = new ctx.ECP8(0),
                Q2 = new ctx.ECP8(0),
                Qaux = new ctx.ECP8(0),

                g11 = new ctx.FP48(0),
                g22 = new ctx.FP48(0),
                g1s = new ctx.FP48(0),
                gs1 = new ctx.FP48(0),
                aux1 = new ctx.FP48(0),
                aux2 = new ctx.FP48(0);

            // Set pairing interface
            PAIR = ctx.PAIR256;
        }

        before(function(done) {
            this.timeout(0);

            var RAW = [];
            rng.clean();
            for (i = 0; i < 100; i++) RAW[i] = i;
            rng.seed(100, RAW);

            // Precompute terms
            x = ctx.BIG.randomnum(r,rng);
            y = ctx.BIG.randomnum(r,rng);
            s = ctx.BIG.randomnum(r,rng);
            G1 = PAIR.G1mul(G,x);
            Q1 = PAIR.G2mul(Q,y);
            sG1 = PAIR.G1mul(G1,s);
            sQ1 = PAIR.G2mul(Q1,s);
            x = ctx.BIG.randomnum(r,rng);
            y = ctx.BIG.randomnum(r,rng);
            G2 = PAIR.G1mul(G,x);
            Q2 = PAIR.G2mul(Q,y);

            g11 = PAIR.ate(Q1, G1);
            g11 = PAIR.fexp(g11);
            g22 = PAIR.ate(Q2, G2);
            g22 = PAIR.fexp(g22);

            if (ctx.ECP.CURVE_PAIRING_TYPE === 1 || ctx.ECP.CURVE_PAIRING_TYPE === 2) {
                g12 = PAIR.ate(Q1, G2);
                g12 = PAIR.fexp(g12);
                g21 = PAIR.ate(Q2, G1);
                g21 = PAIR.fexp(g21);
            }

            done();
        });

        // Test that e(sQ,G) = e(Q,sG) = e(Q,G)^s, s random
        it('test Bilinearity smul', function(done) {
            this.timeout(0);

            g1s = PAIR.ate(Q1, sG1);
            g1s = PAIR.fexp(g1s);
            gs1 = PAIR.ate(sQ1, G1);
            gs1 = PAIR.fexp(gs1);

            expect(g1s.toString()).to.be.equal(gs1.toString());

            gs1 = PAIR.GTpow(g11,s);

            expect(g1s.toString()).to.be.equal(gs1.toString());

            done();
        });

        if (ctx.ECP.CURVE_PAIRING_TYPE === 1 || ctx.ECP.CURVE_PAIRING_TYPE === 2) {
            // Test that e(Q1+Q2,G1) = e(Q1,G1).e(Q2,G1)
            it('test Bilinearity 1st', function(done) {
                this.timeout(0);

                aux1.copy(g11);
                aux1.mul(g21);

                Qaux.copy(Q1);
                Qaux.add(Q2);
                Qaux.affine();

                aux2 = PAIR.ate(Qaux, G1);
                aux2 = PAIR.fexp(aux2);

                expect(aux1.toString()).to.be.equal(aux2.toString());

                done();
            });

            // Test that e(Q1,G1+G2) = e(Q1,G1).e(Q1,G2)
            it('test Bilinearity 2nd', function(done) {
                this.timeout(0);

                aux1.copy(g11);
                aux1.mul(g12);

                Gaux.copy(G1);
                Gaux.add(G2);
                Gaux.affine();

                aux2 = PAIR.ate(Q1, Gaux);
                aux2 = PAIR.fexp(aux2);

                expect(aux1.toString()).to.be.equal(aux2.toString());

                done();
            });
        }

        // Test that ate2 correctly computes e(Q1,G1).e(Q2,G2)
        it('test Double Pairing', function(done) {
            this.timeout(0);

            aux1.copy(g11);
            aux1.mul(g22);

            aux2 = PAIR.ate2(Q1,G1,Q2,G2);
            aux2 = PAIR.fexp(aux2);

            expect(aux1.toString()).to.be.equal(aux2.toString());

            done();
        });
    });
});