/*****************************************************************************************
 *                                                                                       *
 * OpenSpace                                                                             *
 *                                                                                       *
 * Copyright (c) 2014-2019                                                               *
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 * permit persons to whom the Software is furnished to do so, subject to the following   *
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 * The above copyright notice and this permission notice shall be included in all copies *
 * or substantial portions of the Software.                                              *
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 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A         *
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#include "gtest/gtest.h"

#include <openspace/util/concurrentjobmanager.h>

#include <ghoul/misc/threadpool.h>

#define _USE_MATH_DEFINES
#include <math.h>
#include <glm/glm.hpp>

class ConcurrentJobManagerTest : public testing::Test {};

struct TestJob : public openspace::Job<int> {
    TestJob(int jobExecutingTime)
        : _jobExecutingTime(jobExecutingTime)
    {}

    virtual void execute() {
        std::cout << "Executing job ... " << std::endl;
        std::this_thread::sleep_for(std::chrono::milliseconds(_jobExecutingTime));
        
        prod = 1337;
        std::cout << "Finished job" << std::endl;
    }

    virtual int product() {
        return int(prod);
    }

private:
    int _jobExecutingTime;
    int prod;
};



TEST_F(ConcurrentJobManagerTest, Basic) {
    using namespace openspace;

    ConcurrentJobManager<int> jobManager(ThreadPool(1));

    auto testJob1 = std::shared_ptr<TestJob>(new TestJob(20));
    auto testJob2 = std::shared_ptr<TestJob>(new TestJob(20));
    
    jobManager.enqueueJob(testJob1);
    jobManager.enqueueJob(testJob2);

    std::this_thread::sleep_for(std::chrono::milliseconds(10));
    EXPECT_EQ(jobManager.numFinishedJobs(), 0) << "A 20ms job should not be done after 10ms";

    std::this_thread::sleep_for(std::chrono::milliseconds(20));
    
    EXPECT_EQ(jobManager.numFinishedJobs(), 1) << "A 20ms job should be done after 10+20 ms";

    std::this_thread::sleep_for(std::chrono::milliseconds(20));
    EXPECT_EQ(jobManager.numFinishedJobs(), 2) << "A 20ms job and a 20ms job should be done after 10+20+20 ms"; 


    auto finishedJob = jobManager.popFinishedJob();

    int product = finishedJob->product();
    EXPECT_EQ(product, 1337) << "Expecting product to be 1337";
}

struct VerboseProduct {
    VerboseProduct(int v)
    : val(v) {
        std::cout << "VerboseProduct constructor" << std::endl;
    }

    ~VerboseProduct() {
        std::cout << "VerboseProduct destructor" << std::endl;
    }

    int val;
};


struct VerboseJob : public openspace::Job<VerboseProduct> {
    VerboseJob(int jobExecutingTime)
        : _jobExecutingTime(jobExecutingTime)
        , _product(-1)
    {
        std::cout << "VerboseTestJob constructor" << std::endl;
    }

    ~VerboseJob() {
        std::cout << "VerboseTestJob destructor" << std::endl;
    }

    virtual void execute() {
        std::cout << " ** Executing job ... " << std::endl;
        std::this_thread::sleep_for(std::chrono::milliseconds(_jobExecutingTime));
        _product = VerboseProduct(1337);
        std::cout << " ** Finished job" << std::endl;
    }

    virtual VerboseProduct product() {
        return _product;
    }

    int _jobExecutingTime;
    VerboseProduct _product;

};

TEST_F(ConcurrentJobManagerTest, JobCreation) {
    using namespace openspace;
    
    std::this_thread::sleep_for(std::chrono::milliseconds(1000));

    ConcurrentJobManager<VerboseProduct> jobManager(ThreadPool(1));

    auto testJob1 = std::shared_ptr<VerboseJob>(new VerboseJob(20));

    jobManager.enqueueJob(testJob1);

    std::this_thread::sleep_for(std::chrono::milliseconds(10));
    EXPECT_EQ(jobManager.numFinishedJobs(), 0) << "A 20ms job should not be done after 10ms";

    std::this_thread::sleep_for(std::chrono::milliseconds(20));

    EXPECT_EQ(jobManager.numFinishedJobs(), 1) << "A 20ms job should be done after 10+20 ms";


    auto finishedJob = jobManager.popFinishedJob();
    {
        auto product = finishedJob->product();
    }
}