/*
   igraph library.
   Copyright (C) 2022  The igraph development team <igraph@igraph.org>

   This program is 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 2 of the License, or
   (at your option) any later version.

   This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
*/

#include <igraph.h>
#include "test_utilities.h"

void print_destroy(igraph_matrix_t *adjmatrix, igraph_adjacency_t mode, igraph_loops_t loops) {
    igraph_t g;
    igraph_t g_sparse;
    igraph_sparsemat_t sparse_adjmatrix, sparse_adjmatrix_comp;
    igraph_bool_t same;

    igraph_adjacency(&g, adjmatrix, mode, loops);

    igraph_matrix_as_sparsemat(&sparse_adjmatrix, adjmatrix, 0.0001);
    igraph_sparsemat_compress(&sparse_adjmatrix, &sparse_adjmatrix_comp);
    igraph_sparse_adjacency(&g_sparse, &sparse_adjmatrix_comp, mode, loops);
    print_graph_canon(&g);

    igraph_is_same_graph(&g, &g_sparse, &same);
    if (!same) {
        printf("Sparse graph differs from non-sparse:\n");
        print_graph_canon(&g_sparse);
        exit(1);
    }

    igraph_matrix_destroy(adjmatrix);
    igraph_sparsemat_destroy(&sparse_adjmatrix);
    igraph_sparsemat_destroy(&sparse_adjmatrix_comp);
    igraph_destroy(&g);
    igraph_destroy(&g_sparse);
}

void check_error(igraph_matrix_t *adjmatrix, igraph_adjacency_t mode, igraph_loops_t loops, igraph_error_t error) {
    igraph_t g;
    igraph_sparsemat_t sparse_adjmatrix, sparse_adjmatrix_comp;

    igraph_matrix_as_sparsemat(&sparse_adjmatrix, adjmatrix, 0.0001);
    igraph_sparsemat_compress(&sparse_adjmatrix, &sparse_adjmatrix_comp);

    CHECK_ERROR(igraph_adjacency(&g, adjmatrix, mode, loops), error);
    CHECK_ERROR(igraph_sparse_adjacency(&g, &sparse_adjmatrix_comp, mode, loops), error);

    igraph_sparsemat_destroy(&sparse_adjmatrix);
    igraph_sparsemat_destroy(&sparse_adjmatrix_comp);
}

int main(void) {
    igraph_matrix_t adjmatrix;

    printf("\n0x0 matrix:\n");
    matrix_init_int_row_major(&adjmatrix, 0, 0, NULL);
    print_destroy(&adjmatrix, IGRAPH_ADJ_DIRECTED, IGRAPH_LOOPS_ONCE);

    printf("\n1x1 matrix, no loops:\n");
    {
        int e[] = {1};
        matrix_init_int_row_major(&adjmatrix, 1, 1, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_DIRECTED, IGRAPH_NO_LOOPS);
    }
    printf("\n1x1 matrix, loops once:\n");
    {
        int e[] = {1};
        matrix_init_int_row_major(&adjmatrix, 1, 1, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_DIRECTED, IGRAPH_LOOPS_ONCE);
    }
    printf("\n1x1 matrix, loops twice (treated as loops once):\n");
    {
        int e[] = {1};
        matrix_init_int_row_major(&adjmatrix, 1, 1, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_DIRECTED, IGRAPH_LOOPS_TWICE);
    }

    printf("\n3x3 matrix, IGRAPH_ADJ_DIRECTED, no loops:\n");
    {
        int e[] = {4, 2, 0, 3, 0, 4, 0, 5, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_DIRECTED, IGRAPH_NO_LOOPS);
    }
    printf("\n3x3 matrix, IGRAPH_ADJ_DIRECTED, loops once:\n");
    {
        int e[] = {4, 2, 0, 3, 0, 4, 0, 5, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_DIRECTED, IGRAPH_LOOPS_ONCE);
    }
    printf("\n3x3 matrix, IGRAPH_ADJ_DIRECTED, loops twice (treated as loops once):\n");
    {
        int e[] = {4, 2, 0, 3, 0, 4, 0, 5, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_DIRECTED, IGRAPH_LOOPS_TWICE);
    }
    printf("\n3x3 matrix, IGRAPH_ADJ_UNDIRECTED, no loops:\n");
    {
        int e[] = {4, 2, 0, 2, 0, 4, 0, 4, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_UNDIRECTED, IGRAPH_NO_LOOPS);
    }
    printf("\n3x3 matrix, IGRAPH_ADJ_UNDIRECTED, loops once:\n");
    {
        int e[] = {4, 2, 0, 2, 0, 4, 0, 4, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_UNDIRECTED, IGRAPH_LOOPS_ONCE);
    }
    printf("\n3x3 matrix, IGRAPH_ADJ_UNDIRECTED, loops twice:\n");
    {
        int e[] = {4, 2, 0, 2, 0, 4, 0, 4, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_UNDIRECTED, IGRAPH_LOOPS_TWICE);
    }
    printf("\n3x3 matrix, IGRAPH_ADJ_MAX, no loops:\n");
    {
        int e[] = {4, 2, 0, 3, 0, 4, 0, 5, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_MAX, IGRAPH_NO_LOOPS);
    }
    printf("\n3x3 matrix, IGRAPH_ADJ_MAX, loops once:\n");
    {
        int e[] = {4, 2, 0, 3, 0, 4, 0, 5, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_MAX, IGRAPH_LOOPS_ONCE);
    }
    printf("\n3x3 matrix, IGRAPH_ADJ_MAX, loops twice:\n");
    {
        int e[] = {4, 2, 0, 3, 0, 4, 0, 5, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_MAX, IGRAPH_LOOPS_TWICE);
    }
    printf("\n3x3 matrix, IGRAPH_ADJ_MIN, no loops:\n");
    {
        int e[] = {4, 2, 0, 3, 0, 5, 0, 4, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_MIN, IGRAPH_NO_LOOPS);
    }
    printf("\n3x3 matrix, IGRAPH_ADJ_MIN, loops once:\n");
    {
        int e[] = {4, 2, 0, 3, 0, 4, 0, 5, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_MIN, IGRAPH_LOOPS_ONCE);
    }
    printf("\n3x3 matrix, IGRAPH_ADJ_MIN, loops twice:\n");
    {
        int e[] = {4, 2, 0, 3, 0, 4, 0, 5, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_MIN, IGRAPH_LOOPS_TWICE);
    }
    printf("\n3x3 matrix, IGRAPH_ADJ_PLUS, no loops:\n");
    {
        int e[] = {4, 2, 0, 3, 0, 4, 0, 5, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_PLUS, IGRAPH_NO_LOOPS);
    }
    printf("\n3x3 matrix, IGRAPH_ADJ_PLUS, loops once:\n");
    {
        int e[] = {4, 2, 0, 3, 0, 4, 0, 5, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_PLUS, IGRAPH_LOOPS_ONCE);
    }
    printf("\n3x3 matrix, IGRAPH_ADJ_PLUS, loops twice:\n");
    {
        int e[] = {4, 2, 0, 3, 0, 4, 0, 5, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_PLUS, IGRAPH_LOOPS_TWICE);
    }
    printf("\n3x3 matrix, IGRAPH_ADJ_UPPER, no loops:\n");
    {
        int e[] = {4, 2, 0, 3, 0, 4, 0, 5, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_UPPER, IGRAPH_NO_LOOPS);
    }
    printf("\n3x3 matrix, IGRAPH_ADJ_UPPER, loops once:\n");
    {
        int e[] = {4, 2, 0, 3, 0, 4, 0, 5, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_UPPER, IGRAPH_LOOPS_ONCE);
    }
    printf("\n3x3 matrix, IGRAPH_ADJ_UPPER, loops twice (treated as loops once):\n");
    {
        int e[] = {4, 2, 0, 3, 0, 4, 0, 5, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_UPPER, IGRAPH_LOOPS_TWICE);
    }
    printf("\n3x3 matrix, IGRAPH_ADJ_LOWER, no loops:\n");
    {
        int e[] = {4, 2, 0, 3, 0, 4, 0, 5, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_LOWER, IGRAPH_NO_LOOPS);
    }
    printf("\n3x3 matrix, IGRAPH_ADJ_LOWER, loops once:\n");
    {
        int e[] = {4, 2, 0, 3, 0, 4, 0, 5, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_LOWER, IGRAPH_LOOPS_ONCE);
    }
    printf("\n3x3 matrix, IGRAPH_ADJ_LOWER, loops twice (treated as loops once):\n");
    {
        int e[] = {4, 2, 0, 3, 0, 4, 0, 5, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        print_destroy(&adjmatrix, IGRAPH_ADJ_LOWER, IGRAPH_LOOPS_TWICE);
    }

    VERIFY_FINALLY_STACK();

    printf("\nCheck handling of non-square matrix error.\n");
    {
        int e[] = {1, 2, 0};
        matrix_init_int_row_major(&adjmatrix, 3, 1, e);
        check_error(&adjmatrix, IGRAPH_ADJ_DIRECTED, IGRAPH_NO_LOOPS, IGRAPH_EINVAL);
        igraph_matrix_destroy(&adjmatrix);
    }
    printf("\nCheck handling of negative number of edges error.\n");
    {
        int e[] = {1, 2, 0, -3, 0, 4, 0, 5, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        check_error(&adjmatrix, IGRAPH_ADJ_DIRECTED, IGRAPH_NO_LOOPS, IGRAPH_EINVAL);
        igraph_matrix_destroy(&adjmatrix);
    }
    printf("\nCheck handling of odd number in diagonal.\n");
    {
        int e[] = {1, 2, 0, 3, 0, 4, 0, 5, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        check_error(&adjmatrix, IGRAPH_ADJ_UNDIRECTED, IGRAPH_LOOPS_TWICE, IGRAPH_EINVAL);
        igraph_matrix_destroy(&adjmatrix);
    }
    printf("\nCheck handling of invalid adjacency mode.\n");
    {
        int e[] = {0, 2, 0, 3, 0, 4, 0, 5, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        check_error(&adjmatrix, (igraph_adjacency_t) 42, IGRAPH_LOOPS_TWICE, IGRAPH_EINVAL);
        igraph_matrix_destroy(&adjmatrix);
    }
    printf("\nCheck handling of non-symmetric matrix for IGRAPH_ADJ_UNDIRECTED.\n");
    {
        int e[] = {0, 2, 0, 3, 0, 4, 0, 5, 6};
        matrix_init_int_row_major(&adjmatrix, 3, 3, e);
        check_error(&adjmatrix, IGRAPH_ADJ_UNDIRECTED, IGRAPH_LOOPS_ONCE, IGRAPH_EINVAL);
        igraph_matrix_destroy(&adjmatrix);
    }

    VERIFY_FINALLY_STACK();

    return 0;
}