/*
    Copyright (C) 2010,2011 Fredrik Johansson
    Copyright (C) 2013 Mike Hansen

    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/>.
*/

#ifdef T

#include "templates.h"

#include <stdio.h>
#include <stdlib.h>
#include <limits.h>

int
main(void)
{
    slong i;
    FLINT_TEST_INIT(state);

    printf("solve_tril_recursive....");
    fflush(stdout);

    for (i = 0; i < 5 * flint_test_multiplier(); i++)
    {
        TEMPLATE(T, ctx_t) ctx;
        TEMPLATE(T, mat_t) A, X, B, Y;

        slong rows, cols;
        int unit;

        TEMPLATE(T, ctx_randtest) (ctx, state);

        rows = n_randint(state, 50);
        cols = n_randint(state, 50);
        unit = n_randint(state, 2);

        TEMPLATE(T, mat_init) (A, rows, rows, ctx);
        TEMPLATE(T, mat_init) (B, rows, cols, ctx);
        TEMPLATE(T, mat_init) (X, rows, cols, ctx);
        TEMPLATE(T, mat_init) (Y, rows, cols, ctx);

        TEMPLATE(T, mat_randtril) (A, state, unit, ctx);
        TEMPLATE(T, mat_randtest) (X, state, ctx);
        TEMPLATE(T, mat_mul) (B, A, X, ctx);

        /* Check Y = A^(-1) * (A * X) = X */
        TEMPLATE(T, mat_solve_tril_recursive) (Y, A, B, unit, ctx);
        if (!TEMPLATE(T, mat_equal) (Y, X, ctx))
        {
            printf("FAIL!\n");
            printf("A:\n");
            TEMPLATE(T, mat_print_pretty) (A, ctx);
            printf("X:\n");
            TEMPLATE(T, mat_print_pretty) (X, ctx);
            printf("B:\n");
            TEMPLATE(T, mat_print_pretty) (B, ctx);
            printf("Y:\n");
            TEMPLATE(T, mat_print_pretty) (Y, ctx);
            abort();
        }

        /* Check aliasing */
        TEMPLATE(T, mat_solve_tril_recursive) (B, A, B, unit, ctx);
        if (!TEMPLATE(T, mat_equal) (B, X, ctx))
        {
            printf("FAIL!\n");
            printf("aliasing test failed");
            printf("A:\n");
            TEMPLATE(T, mat_print_pretty) (A, ctx);
            printf("B:\n");
            TEMPLATE(T, mat_print_pretty) (B, ctx);
            abort();
        }

        TEMPLATE(T, mat_clear) (A, ctx);
        TEMPLATE(T, mat_clear) (B, ctx);
        TEMPLATE(T, mat_clear) (X, ctx);
        TEMPLATE(T, mat_clear) (Y, ctx);

        TEMPLATE(T, ctx_clear) (ctx);
    }

    FLINT_TEST_CLEANUP(state);
    printf("PASS\n");
    return 0;
}

#endif