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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2023 Mike Becker, Olaf Wintermann All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "cx/test.h"

#include "cx/utils.h"
#include "cx/buffer.h"

CX_TEST(test_stream_bncopy) {
    CxBuffer source, target;
    char sbuf[32], tbuf[32];
    memset(tbuf, 0, 32);
    cxBufferInit(&source, sbuf, 32, NULL, 0);
    cxBufferInit(&target, tbuf, 32, NULL, 0);
    cxBufferPutString(&source, "This is a stream copy test.");
    cxBufferSeek(&source, 0, SEEK_SET);
    char tmp[4];

    CX_TEST_DO {
        size_t result = cx_stream_bncopy(&source, &target,
                                         (cx_read_func) cxBufferRead,
                                         (cx_write_func) cxBufferWrite,
                                         tmp, 4, 20);
        CX_TEST_ASSERT(result == 20);
        CX_TEST_ASSERT(target.size == 20);
        CX_TEST_ASSERT(strcmp("This is a stream cop\0", tbuf) == 0);

        result = cx_stream_bcopy(&source, &target,
                                 (cx_read_func) cxBufferRead,
                                 (cx_write_func) cxBufferWrite,
                                 NULL, 16);

        CX_TEST_ASSERT(result == 7);
        CX_TEST_ASSERT(target.size == 27);
        CX_TEST_ASSERT(strcmp("This is a stream copy test.\0", tbuf) == 0);
    }

    cxBufferDestroy(&source);
    cxBufferDestroy(&target);
}

CX_TEST(test_stream_ncopy) {
    CxBuffer source, target;
    char sbuf[32], tbuf[32];
    memset(tbuf, 0, 32);
    cxBufferInit(&source, sbuf, 32, NULL, 0);
    cxBufferInit(&target, tbuf, 32, NULL, 0);
    cxBufferPutString(&source, "This is a stream copy test.");
    cxBufferSeek(&source, 0, SEEK_SET);

    CX_TEST_DO {
        size_t result = cx_stream_ncopy(&source, &target,
                                        (cx_read_func) cxBufferRead,
                                        (cx_write_func) cxBufferWrite,
                                        20);
        CX_TEST_ASSERT(result == 20);
        CX_TEST_ASSERT(target.size == 20);
        CX_TEST_ASSERT(strcmp("This is a stream cop\0", tbuf) == 0);

        result = cx_stream_copy(&source, &target,
                                (cx_read_func) cxBufferRead,
                                (cx_write_func) cxBufferWrite);

        CX_TEST_ASSERT(result == 7);
        CX_TEST_ASSERT(target.size == 27);
        CX_TEST_ASSERT(strcmp("This is a stream copy test.\0", tbuf) == 0);
    }

    cxBufferDestroy(&source);
    cxBufferDestroy(&target);
}

CX_TEST(test_forn) {
    unsigned j;
    j = 0;
    CX_TEST_DO {
        cx_for_n(i, 50) {
            CX_TEST_ASSERT(i == j);
            j++;
        }
    }
}

CX_TEST(test_szmul) {
    size_t r;
    int e;

    CX_TEST_DO {
        e = cx_szmul(5, 7, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 35);

        size_t s = SIZE_MAX & ~3;

        e = cx_szmul(s / 4, 2, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == s / 2);

        e = cx_szmul(2, s / 4, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == s / 2);

        e = cx_szmul(s / 4, 4, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == s);

        e = cx_szmul(4, s / 4, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == s);

        e = cx_szmul(s / 4, 5, &r);
        CX_TEST_ASSERT(e != 0);

        e = cx_szmul(5, s / 4, &r);
        CX_TEST_ASSERT(e != 0);

        e = cx_szmul(SIZE_MAX - 4, 0, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 0);

        e = cx_szmul(0, SIZE_MAX - 1, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 0);

        e = cx_szmul(SIZE_MAX, 0, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 0);

        e = cx_szmul(0, SIZE_MAX, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 0);

        e = cx_szmul(0, 0, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 0);
    }
}

#ifdef CX_SZMUL_BUILTIN

// also test the custom implementation
#undef CX_SZMUL_BUILTIN

#include "../src/szmul.c"

#define CX_SZMUL_BUILTIN

CX_TEST(test_szmul_impl) {
    size_t r;
    int e;

    CX_TEST_DO {
        e = cx_szmul_impl(5, 7, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 35);

        size_t s = SIZE_MAX & ~3;

        e = cx_szmul_impl(s / 4, 2, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == s / 2);

        e = cx_szmul_impl(2, s / 4, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == s / 2);

        e = cx_szmul_impl(s / 4, 4, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == s);

        e = cx_szmul_impl(4, s / 4, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == s);

        e = cx_szmul_impl(s / 4, 5, &r);
        CX_TEST_ASSERT(e != 0);

        e = cx_szmul_impl(5, s / 4, &r);
        CX_TEST_ASSERT(e != 0);

        e = cx_szmul_impl(SIZE_MAX - 4, 0, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 0);

        e = cx_szmul_impl(0, SIZE_MAX - 1, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 0);

        e = cx_szmul_impl(SIZE_MAX, 0, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 0);

        e = cx_szmul_impl(0, SIZE_MAX, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 0);

        e = cx_szmul_impl(0, 0, &r);
        CX_TEST_ASSERT(e == 0);
        CX_TEST_ASSERT(r == 0);
    }
}

#endif // CX_SZMUL_BUILTIN


CxTestSuite *cx_test_suite_utils(void) {
    CxTestSuite *suite = cx_test_suite_new("utils");

    cx_test_register(suite, test_stream_bncopy);
    cx_test_register(suite, test_stream_ncopy);
    cx_test_register(suite, test_forn);
    cx_test_register(suite, test_szmul);
#ifdef CX_SZMUL_BUILTIN
    cx_test_register(suite, test_szmul_impl);
#endif

    return suite;
}