/*
* Copyright (C) 2015 - 2019 Intel Corporation.
* 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(s),
*    this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice(s),
*    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 HOLDER(S) ``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(S) 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
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include "StressIncreaseToMax.h"


void StressIncreaseToMax::run()
{
    //Generate constant allocation sizes.
    VectorIterator<size_t> allocation_sizes =
        AllocationSizes::generate_random_sizes(task_conf.allocation_sizes_conf,
                                               task_conf.seed);
    //Generate only mallocs.
    VectorIterator<int> func_calls =
        FunctionCalls::generate_random_allocator_func_calls(task_conf.n, task_conf.seed,
                                                            task_conf.func_calls);

    unsigned type;
    for (type = 0; type < AllocatorTypes::NUM_OF_ALLOCATOR_TYPES; type++) {
        if(task_conf.allocators_types.is_enabled(type))
            break; //Assume that there is only one type.
    }


    AllocatorFactory allocator_factory;
    VectorIterator<Allocator *> allocators_calls =
        allocator_factory.generate_random_allocator_calls(task_conf.n, task_conf.seed,
                                                          task_conf.allocators_types);

    ScenarioWorkload scenario_workload(
        &allocators_calls,
        &allocation_sizes,
        &func_calls
    );

    scenario_workload.enable_touch_memory_on_allocation(task_conf.touch_memory);

    test_status.is_allocation_error = false;

    size_t requested_memory = 0;
    bool has_reach_memory_request_limit = false;

    while (!has_reach_memory_request_limit &&
           !test_status.is_allocation_error &&
           (test_status.has_next_memory_operation = scenario_workload.run())) {
        memory_operation data = scenario_workload.get_allocations_info().back();
        test_status.is_allocation_error = (data.error_code == ENOMEM) ||
                                          (data.ptr == NULL);

        if(data.allocation_method != FunctionCalls::FREE) {
            requested_memory += data.size_of_allocation;
            has_reach_memory_request_limit = requested_memory >= req_mem_limit;
        }
    }

    if(!(scenario_workload.get_allocations_info().size() < task_conf.n) &&
       !has_reach_memory_request_limit)
        printf("\nWARNING: Too few memory operations to reach the limit.\n");
    if(test_status.is_allocation_error) printf("\nWARNING: Allocation error. \n");

    results = scenario_workload.get_allocations_info();
}

std::vector<iteration_result> StressIncreaseToMax::execute_test_iterations(
    const TaskConf &task_conf,
    unsigned time,
    size_t requested_memory_limit)
{
    TimerSysTime timer;
    unsigned itr = 0;
    std::vector<iteration_result> results;

    std::ofstream csv_file;

    csv::Row row;
    row.append("Iteration");
    row.append("Allocated memory (MB)");
    row.append("Elapsed time (seconds)");
    if(task_conf.is_csv_log_enabled) {
        csv_file.open("stress_test_increase_to_max.csv");
        csv_file << row.export_row();
    }
    printf("%s", row.export_row().c_str());

    timer.start();

    while (timer.getElapsedTime() < time) {
        StressIncreaseToMax stress_test(task_conf, requested_memory_limit);
        stress_test.run();
        float elapsed_time = timer.getElapsedTime();

        TimeStats stats;
        stats += stress_test.get_results();

        results.push_back(stress_test.get_test_status());

        //Log every iteration of StressIncreaseToMax test.
        csv::Row row;
        row.append(itr);
        row.append(convert_bytes_to_mb(stats.get_allocated()));
        row.append(elapsed_time);
        if(task_conf.is_csv_log_enabled) {
            csv_file << row.export_row();
        }
        printf("%s", row.export_row().c_str());
        fflush(stdout);

        itr++;
    }

    printf("\nStress test (StressIncreaseToMax) finish in time %f.\n",
           timer.getElapsedTime());

    csv_file.close();

    return results;
}