/*
    Copyright (C) 2013 Tom Bachmann

    This file is part of FLINT.

    FLINT is free software: you can redistribute it and/or modify it under
    the terms of the GNU Lesser General Public License (LGPL) as published
    by the Free Software Foundation; either version 2.1 of the License, or
    (at your option) any later version.  See <https://www.gnu.org/licenses/>.
*/

#include <iostream>

#include "nmod_matxx.h"

#include "flintxx/test/helpers.h"

using namespace flint;

void
test_init()
{
    mp_limb_t M = 1039;
    nmod_matxx A(3, 4, M);
    nmodxx_ctx_srcref ctx = A.estimate_ctx();
    tassert(ctx.n() == M);
    tassert((A + A).modulus() == M);
    tassert(A.rows() == 3 && A.cols() == 4);
    tassert(A.at(0, 0) == nmodxx::red(0, ctx));
    A.at(0, 0) = nmodxx::red(1, ctx);

    nmod_matxx B(A);
    tassert(A == B);
    tassert(B.rows() == 3 && B.cols() == 4);
    tassert(B.at(0, 0) == nmodxx::red(1, ctx));
    B.at(0, 0) = nmodxx::red(0, ctx);
    tassert(A.at(0, 0) == nmodxx::red(1, ctx));
    tassert(A != B);

    B = A;
    tassert(A == B);

    A.set_zero();
    tassert(A.is_zero() && A == nmod_matxx::zero(A.rows(), A.cols(), A.modulus()));
}

template<class Expr>
bool has_explicit_temporaries(const Expr&)
{
    return Expr::ev_traits_t::rule_t::temporaries_t::len != 0;
}
void
test_arithmetic()
{
    mp_limb_t M = 1039;
    nmod_matxx A(10, 10, M);
    nmod_matxx v(10, 1, M);
    nmodxx_ctx_srcref ctx = A.estimate_ctx();
    for(unsigned i = 0;i < 10;++i)
        v.at(i, 0) = nmodxx::red(i, ctx);
    nmodxx two = nmodxx::red(2, ctx);

    tassert(transpose(v).rows() == 1);
    tassert(v.transpose().cols() == 10);
    tassert((two*v).rows() == 10);
    tassert((v*two).rows() == 10);
    tassert((v*transpose(v)).rows() == 10 && (v*transpose(v)).cols() == 10);

    tassert(!has_explicit_temporaries(trace(transpose(v))));
    tassert(!has_explicit_temporaries(trace(A + v*transpose(v))));
    tassert(!has_explicit_temporaries(A + v*transpose(v)));
    tassert(!has_explicit_temporaries(trace((v*transpose(v) + A))));
    tassert(!has_explicit_temporaries(trace(v*transpose(v) + v*transpose(v))));
    tassert(!has_explicit_temporaries(v*transpose(v) + v*transpose(v)));

    tassert(trace(transpose(v)) == nmodxx::red(0, ctx));
    tassert(trace(A + v*transpose(v)) == nmodxx::red(285, ctx));
    tassert(trace(v*transpose(v) + A) == nmodxx::red(285, ctx));
    tassert(trace(v*transpose(v) + v*transpose(v)) == nmodxx::red(2*285, ctx));
    tassert(trace((A+A)*(nmodxx::red(1, ctx) + nmodxx::red(1, ctx)))
            == nmodxx::red(0, ctx));

    for(unsigned i = 0;i < 10; ++i)
        for(unsigned j = 0; j < 10; ++j)
            A.at(i, j) = nmodxx::red(i*j, ctx);
    tassert(A == v*transpose(v));
    tassert(A != transpose(v)*v);
    A.at(0, 0) = nmodxx::red(15, ctx);
    tassert(A != v*transpose(v));

    A.at(0, 0) = nmodxx::red(0, ctx);
    for(unsigned i = 0;i < 10; ++i)
        for(unsigned j = 0; j < 10; ++j)
            A.at(i, j) *= two;
    tassert(A == v*transpose(v) + v*transpose(v));
    tassert(A - v*transpose(v) == v*transpose(v));
    tassert(((-A) + A).is_zero());
    tassert((A + A).at(0, 0) == A.at(0, 0) + A.at(0, 0));
}

void
test_functions()
{
    mp_limb_t M = 1031;
    nmod_matxx A(2, 3, M), B(2, 2, M), empty(0, 15, M);
    nmodxx_ctx_srcref ctx = A.estimate_ctx();
    B.at(0, 0) = nmodxx::red(1, ctx);
    tassert(A.is_zero() && !A.is_empty() && !A.is_square());
    tassert(!B.is_zero() == B.is_square());
    tassert(empty.is_zero() && empty.is_empty());

    // transpose tested in arithmetic
    // mul tested in arithmetic
    // trace tested in arithmetic

    frandxx rand;
    A.set_randtest(rand);
    B.set_randtest(rand);
    tassert(B*A == B.mul_classical(A));
    tassert(B*A == B.mul_strassen(A));

    B.set_randrank(rand, 1);
    tassert(B.det() == nmodxx::red(0, ctx));
    B.set_randrank(rand, 2);
    tassert(B.det() != nmodxx::red(0, ctx));

    B.set_randrank(rand, 1);
    assert_exception(B.inv().evaluate());

    B.set_randrank(rand, 2);
    nmod_matxx eye(2, 2, M);
    eye.at(0, 0) = nmodxx::red(1, ctx);eye.at(1, 1) = nmodxx::red(1, ctx);
    tassert(B.inv() * B == eye);

    A.set_randrank(rand, 2);
    tassert(rank(A) == 2);

    B.set_randtril(rand, false);
    tassert(B*B.solve_tril(A, false) == A);
    tassert(B.solve_tril_classical(A, false) == B.solve_tril(A, false));
    tassert(B.solve_tril_recursive(A, false) == B.solve_tril(A, false));
    B.set_randtriu(rand, true);
    tassert(B*B.solve_triu(A, true) == A);
    tassert(B.solve_triu_classical(A, true) == B.solve_triu(A, true));
    tassert(B.solve_triu_recursive(A, true) == B.solve_triu(A, true));

    B.set_randrank(rand, 2);
    tassert(B*B.solve(A) == A);
    nmod_vecxx X(2, ctx); X[0] = nmodxx::red(1, ctx); X[1] = nmodxx::red(2, ctx);
    X = B.solve(X);
    tassert(B.at(0, 0)*X[0] + B.at(0, 1) * X[1] == nmodxx::red(1, ctx));
    tassert(B.at(1, 0)*X[0] + B.at(1, 1) * X[1] == nmodxx::red(2, ctx));

    B.set_randrank(rand, 1);
    assert_exception(B.solve(A).evaluate());
    assert_exception(B.solve(X).evaluate());

    slong nullity;nmod_matxx C(3, 3, M);
    tassert(nullspace(A).get<1>().rows() == 3);
    tassert(nullspace(A).get<1>().cols() == 3);
    ltupleref(nullity, C) = nullspace(A);
    tassert(nullity == 3 - rank(A));
    tassert(C.rank() == nullity);
    tassert((A*C).is_zero());

    A.set_rref();
    tassert(A.at(1, 0) == nmodxx::red(0, ctx));
}

void
test_randomisation()
{
    frandxx rand;
    mp_limb_t M = 1031;
    nmod_matxx A(2, 2, M);
    nmodxx_ctx_srcref ctx = A.estimate_ctx();

    // not really anything we can test about these ...
    // just make sure the call works
    A.set_randtest(rand);
    A.set_randfull(rand);


    nmod_vecxx v(2, ctx);v[0] = nmodxx::red(5, ctx);v[1] = nmodxx::red(7, ctx);
    A.set_randpermdiag(rand, v);
    tassert(A.at(0, 0) + A.at(0, 1) + A.at(1, 0) + A.at(1, 1)
            == nmodxx::red(5 + 7, ctx));

    A.set_randrank(rand, 1);
    tassert(A.rank() == 1);
    A.apply_randops(rand, 17);
    tassert(A.rank() == 1);

    A.set_randtril(rand, true);
    tassert(A.at(0, 0) == nmodxx::red(1, ctx));
    tassert(A.at(1, 1) == nmodxx::red(1, ctx));
    tassert(A.at(0, 1) == nmodxx::red(0, ctx));

    A.set_randtriu(rand, false);
    tassert(A.at(1, 0) == nmodxx::red(0, ctx));

    frandxx rand2, rand3;
    nmod_matxx B(2, 2, M);

    B.set_randtest(rand2);
    tassert(B == nmod_matxx::randtest(2, 2, M, rand3));
    B.set_randfull(rand2);
    tassert(B == nmod_matxx::randfull(2, 2, M, rand3));
    B.set_randrank(rand2, 1);
    tassert(B == nmod_matxx::randrank(2, 2, M, rand3, 1));
    B.set_randtril(rand2, false);
    tassert(B == nmod_matxx::randtril(2, 2, M, rand3, false));
    B.set_randtriu(rand2, false);
    tassert(B == nmod_matxx::randtriu(2, 2, M, rand3, false));
    B.set_randpermdiag(rand2, v);
    tassert(B == nmod_matxx::randpermdiag(2, 2, M, rand3, v));
}

void
test_reduction_reconstruction()
{
    std::vector<mp_limb_t> primes;
    primes.push_back(1031);
    primes.push_back(1033);
    primes.push_back(1039);
    mp_limb_t M = primes[0];

    frandxx rand;
    fmpz_matxx A(5, 7);A.set_randtest(rand, 8);
    nmod_matxx Ap = nmod_matxx::reduce(A, M);
    nmodxx_ctx_srcref ctx = Ap.estimate_ctx();
    tassert(Ap.rows() == A.rows() && Ap.cols() == A.cols());
    for(slong i = 0;i < A.rows();++i)
        for(slong j = 0;j < A.cols();++j)
            tassert(Ap.at(i, j) == nmodxx::red(A.at(i, j), ctx));
    tassert(A == fmpz_matxx::lift(Ap));

    for(slong i = 0;i < A.rows();++i)
        for(slong j = 0;j < A.cols();++j)
            A.at(i, j) = abs(A.at(i, j));
    tassert(A == fmpz_matxx::lift_unsigned(nmod_matxx::reduce(A, M)));

    nmod_mat_vector v1(A.rows(), A.cols(), primes);
    nmod_mat_vector v2(v1);
    tassert(v1 == v2);
    v2[0].at(0, 0) += nmodxx::red(1, ctx);
    tassert(v2[0].at(0, 0) != v1[0].at(0, 0));
    tassert(v1 != v2);
    v2 = v1;
    tassert(v1 == v2);

    A.set_randtest(rand, 25);
    for(unsigned i = 0;i < primes.size();++i)
        v1[i] = nmod_matxx::reduce(A, primes[i]);
    tassert(v1 == multi_mod(A, primes));

    fmpz_combxx comb(primes);
    tassert(multi_mod(A, primes) == multi_mod_precomp(A, primes, comb));

    fmpzxx prod(1);
    fmpz_matxx res(A.rows(), A.cols());
    for(unsigned i = 0;i < primes.size();++i)
    {
        res = res.CRT(prod, v1[i], true);
        prod *= primes[i];
    }
    tassert(res == A);
    tassert(res == multi_CRT(v1, true));
    tassert(res == multi_CRT_precomp(v1, comb, true));
}

void
test_lu()
{
    frandxx rand;
    nmod_matxx A = nmod_matxx::randtest(5, 5, 1031, rand);
    nmod_matxx B1(A), B2(A);
    nmod_matxx::lu_rt res = B1.set_lu();
    permxx perm(5);
    slong rank = nmod_mat_lu(perm._data(), B2._mat(), false);
    tassert(B1 == B2 && rank == res.first() && perm == res.second());

    B1 = A; B2 = A;
    tassert(B1.set_lu_classical() == B2.set_lu() && B1 == B2);

    B1 = A; B2 = A;
    tassert(B1.set_lu_recursive() == B2.set_lu() && B1 == B2);
}

void
test_printing()
{
    if(0)
        print_pretty(nmod_matxx::zero(2, 2, 7)); // make sure this compiles
}

int
main()
{
    std::cout << "nmod_matxx....";

    test_init();
    test_arithmetic();
    test_functions();
    test_randomisation();
    test_reduction_reconstruction();
    test_lu();
    test_printing();

    std::cout << "PASS" << std::endl;
    return 0;
}