#include <gtest/gtest.h>
#include <chrono>
#include <iostream>
#include <iomanip>

// TODO: Add necessary includes for collision testing
// #include "collision_shapes.hpp"
// #include "entities.hpp"

/**
 * @file collision_performance.cpp
 * @brief Performance tests for collision detection systems
 * 
 * This file contains performance benchmarks and tests for various
 * collision detection algorithms and optimizations.
 */

/**
 * @brief Helper class to measure and print execution time
 */
class PerformanceTimer {
public:
    using Clock = std::chrono::high_resolution_clock;
    using TimePoint = std::chrono::time_point<Clock>;
    using Duration = std::chrono::duration<double, std::milli>;
    
    PerformanceTimer(const std::string& name) : name_(name) {
        start_ = Clock::now();
    }
    
    ~PerformanceTimer() {
        auto end = Clock::now();
        Duration duration = end - start_;
        std::cout << std::fixed << std::setprecision(3)
                  << "[PERF] " << name_ << ": " 
                  << duration.count() << " ms" << std::endl;
    }
    
    double elapsed_ms() const {
        auto end = Clock::now();
        Duration duration = end - start_;
        return duration.count();
    }
    
private:
    std::string name_;
    TimePoint start_;
};

/**
 * @brief Run a function multiple times and measure average execution time
 * @param name Name of the test for output
 * @param iterations Number of iterations to run
 * @param func Function to benchmark
 */
template<typename Func>
void benchmark_function(const std::string& name, int iterations, Func func) {
    auto start = PerformanceTimer::Clock::now();
    
    for (int i = 0; i < iterations; ++i) {
        func();
    }
    
    auto end = PerformanceTimer::Clock::now();
    PerformanceTimer::Duration total_duration = end - start;
    double avg_duration = total_duration.count() / iterations;
    
    std::cout << std::fixed << std::setprecision(6)
              << "[BENCHMARK] " << name << ":\n"
              << "  Total: " << total_duration.count() << " ms\n"
              << "  Iterations: " << iterations << "\n"
              << "  Average: " << avg_duration << " ms\n"
              << "  Throughput: " << (iterations / (total_duration.count() / 1000.0))
              << " ops/sec" << std::endl;
}

// Example test function 1
void test_function_1() {
    // TODO: Implement actual collision test
    volatile int sum = 0;
    for (int i = 0; i < 1000; ++i) {
        sum += i;
    }
}

// Example test function 2
void test_function_2() {
    // TODO: Implement actual collision test
    volatile int product = 1;
    for (int i = 1; i < 100; ++i) {
        product *= (i % 10 + 1);
    }
}

TEST(CollisionPerformance, CompareAlgorithms) {
    std::cout << "\n=== Collision Performance Comparison ===\n" << std::endl;
    
    const int iterations = 10000;
    
    benchmark_function("Algorithm 1 (test_function_1)", iterations, test_function_1);
    benchmark_function("Algorithm 2 (test_function_2)", iterations, test_function_2);
    
    std::cout << "\n======================================\n" << std::endl;
    
    SUCCEED();
}