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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2021 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/basic_mempool.h"
#include "util_allocator.h"
#include <gtest/gtest.h>

class CxBasicMempool : public ::testing::Test {
protected:
    CxMempool *pool = nullptr;

    void TearDown() override {
        if (pool != nullptr) {
            cxMempoolDestroy(pool);
        }
    }
};

TEST_F(CxBasicMempool, Create) {
    pool = cxBasicMempoolCreate(16);
    ASSERT_NE(pool->allocator, nullptr);
    ASSERT_NE(pool->cl, nullptr);
    EXPECT_NE(pool->cl->destroy, nullptr);
    ASSERT_NE(pool->allocator->cl, nullptr);
    EXPECT_EQ(pool->allocator->data, pool);
    EXPECT_NE(pool->allocator->cl->malloc, nullptr);
    EXPECT_NE(pool->allocator->cl->calloc, nullptr);
    EXPECT_NE(pool->allocator->cl->realloc, nullptr);
    EXPECT_NE(pool->allocator->cl->free, nullptr);

    auto basic_pool = reinterpret_cast<cx_basic_mempool_s *>(pool);
    EXPECT_EQ(basic_pool->size, 16);
    EXPECT_EQ(basic_pool->ndata, 0);
    EXPECT_NE(basic_pool->data, nullptr);
}

TEST_F(CxBasicMempool, malloc) {
    pool = cxBasicMempoolCreate(4);
    auto basic_pool = reinterpret_cast<cx_basic_mempool_s *>(pool);
    EXPECT_NE(cxMalloc(pool->allocator, sizeof(int)), nullptr);
    EXPECT_NE(cxMalloc(pool->allocator, sizeof(int)), nullptr);
    EXPECT_EQ(basic_pool->ndata, 2);
    EXPECT_EQ(basic_pool->size, 4);
    EXPECT_NE(cxMalloc(pool->allocator, sizeof(int)), nullptr);
    EXPECT_NE(cxMalloc(pool->allocator, sizeof(int)), nullptr);
    EXPECT_EQ(basic_pool->ndata, 4);
    EXPECT_EQ(basic_pool->size, 4);
    EXPECT_NE(cxMalloc(pool->allocator, sizeof(int)), nullptr);
    EXPECT_NE(cxMalloc(pool->allocator, sizeof(int)), nullptr);
    EXPECT_EQ(basic_pool->ndata, 6);
    EXPECT_GE(basic_pool->size, 6);
}

TEST_F(CxBasicMempool, calloc) {
    pool = cxBasicMempoolCreate(4);

    auto test = (int *) cxCalloc(pool->allocator, 2, sizeof(int));
    ASSERT_NE(test, nullptr);
    EXPECT_EQ(test[0], 0);
    EXPECT_EQ(test[1], 0);
}

static unsigned test_destructor_called = 0;

static void test_destructor([[maybe_unused]] void *mem) {
    test_destructor_called++;
}

TEST_F(CxBasicMempool, destructor) {
    pool = cxBasicMempoolCreate(4);
    auto data = cxMalloc(pool->allocator, sizeof(int));
    *((int *) data) = 13;
    cxMempoolSetDestructor(pool, data, test_destructor);
    EXPECT_EQ(*((int *) data), 13);
    test_destructor_called = 0;
    cxFree(pool->allocator, data);
    EXPECT_EQ(test_destructor_called, 1);
    data = cxMalloc(pool->allocator, sizeof(int));
    cxMempoolSetDestructor(pool, data, test_destructor);
    cxMempoolDestroy(pool);
    pool = nullptr;
    EXPECT_EQ(test_destructor_called, 2);
}

TEST_F(CxBasicMempool, realloc) {
    pool = cxBasicMempoolCreate(4);
    auto data = cxMalloc(pool->allocator, sizeof(int));
    *((int *) data) = 13;
    cxMempoolSetDestructor(pool, data, test_destructor);

    void *rdata = data;
    unsigned n = 1;
    while (rdata == data) {
        n <<= 1;
        ASSERT_LT(n, 65536); // eventually the memory should be moved elsewhere
        rdata = cxRealloc(pool->allocator, data, n * sizeof(intptr_t));
    }

    EXPECT_EQ(*((int *) rdata), 13);
    // test if destructor is still intact
    test_destructor_called = 0;
    cxFree(pool->allocator, rdata);
    EXPECT_EQ(test_destructor_called, 1);
}


TEST_F(CxBasicMempool, free) {
    pool = cxBasicMempoolCreate(4);
    auto basic_pool = reinterpret_cast<cx_basic_mempool_s *>(pool);

    void *mem1;
    void *mem2;

    mem1 = cxMalloc(pool->allocator, 16);
    cxFree(pool->allocator, mem1);
    EXPECT_EQ(basic_pool->ndata, 0);

    cxMalloc(pool->allocator, 16);
    cxMalloc(pool->allocator, 16);
    mem1 = cxMalloc(pool->allocator, 16);
    cxMalloc(pool->allocator, 16);
    mem2 = cxMalloc(pool->allocator, 16);

    EXPECT_EQ(basic_pool->ndata, 5);
    cxFree(pool->allocator, mem1);
    EXPECT_EQ(basic_pool->ndata, 4);
    cxFree(pool->allocator, mem2);
    EXPECT_EQ(basic_pool->ndata, 3);
}