#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <iostream>
#include <cstring>
#include <thread>
#include <chrono>
#include <sys/stat.h>

#include "core/SharedCommandQueue.h"
#include "utils/hash/Hash128.h"

// int main()
// {
//     constexpr const char* shm_name = "/shm_rates1";
//     constexpr size_t shm_size = sizeof(usub::core::SharedCommandQueue);
//
//     int shm_fd = shm_open(shm_name, O_RDWR, 0600);
//     if (shm_fd == -1)
//     {
//         perror("shm_open failed");
//         return 1;
//     }
//
//     void* ptr = mmap(nullptr, shm_size, PROT_READ | PROT_WRITE, MAP_SHARED, shm_fd, 0);
//     if (ptr == MAP_FAILED)
//     {
//         perror("mmap failed");
//         close(shm_fd);
//         return 1;
//     }
//
//     auto* queue = static_cast<usub::core::SharedCommandQueue*>(ptr);
//     std::cout << "[CLIENT] Connected to shared memory.\n";
//
//     size_t head = queue->head().load(std::memory_order_relaxed);
//     size_t next_head = (head + 1) % queue->capacity();
//     while (next_head == queue->tail().load(std::memory_order_acquire))
//     {
//         std::this_thread::sleep_for(std::chrono::milliseconds(1)); // wait
//     }
//
//     usub::core::Command* slot = &queue->raw_buffer()[head];
//
//     // заполняем slot
//     slot->op = usub::core::OperationType::PUT;
//     slot->key = usub::utils::compute_hash128("test_key", 9);
//     const char* put_value = "test_value";
//     slot->value_size = std::strlen(put_value);
//     std::memcpy(slot->value, put_value, slot->value_size);
//     slot->response_size = 0;
//     slot->response_ready.store(0, std::memory_order_relaxed);
//
//     slot->ready.store(1, std::memory_order_release);
//
//     // обновляем head
//     queue->head().store(next_head, std::memory_order_release);
//
//     std::cout << "[CLIENT] PUT command sent.\n";
//
//     // Ожидание, можно реализовать FIND аналогично.
//
//     munmap(ptr, shm_size);
//     close(shm_fd);
//
//     return 0;
// }

int main()
{
    constexpr const char* shm_name = "/shm_rates1";
    constexpr size_t capacity = 1024; // или то, что реально
    size_t shm_size = usub::core::SharedCommandQueue::calculate_shm_size(capacity);

    int shm_fd = shm_open(shm_name, O_RDWR, 0600);
    if (shm_fd == -1)
    {
        perror("shm_open failed");
        return 1;
    }

//    struct stat statbuf;
//    if (fstat(shm_fd, &statbuf) == -1)
//    {
//        perror("fstat failed");
//        close(shm_fd);
//        return 1;
//    }

//    void* ptr = mmap(nullptr, statbuf.st_size, PROT_READ | PROT_WRITE, MAP_SHARED, shm_fd, 0);
    void* ptr = mmap(nullptr, shm_size, PROT_READ | PROT_WRITE, MAP_SHARED, shm_fd, 0);
    if (ptr == MAP_FAILED)
    {
        perror("mmap failed");
        close(shm_fd);
        return 1;
    }

    auto* queue = static_cast<usub::core::SharedCommandQueue*>(ptr);
    std::cout << "[CLIENT] Connected to shared memory.\n";

    // -------------------
    // PUT Command
    // -------------------
    {
        std::cout << "1\n";
        auto head = queue->head().load(std::memory_order_relaxed);
        size_t next_head = (head + 1) % queue->capacity();
        while (next_head == queue->tail().load(std::memory_order_acquire))
        {
            std::this_thread::sleep_for(std::chrono::milliseconds(1));
        }
        std::cout << "2\n";

        usub::core::Command* slot = &queue->raw_buffer()[head];

        std::cout << "queue = " << queue << '\n';
        std::cout << "queue->capacity() = " << queue->capacity() << '\n';
        std::cout << "head = " << head << '\n';
        std::cout << "ptr to raw_buffer = " << static_cast<void*>(queue->raw_buffer()) << '\n';
        std::cout << "ptr to slot = " << static_cast<void*>(&queue->raw_buffer()[head]) << '\n';
        std::cout.flush();

        slot->op = usub::core::OperationType::PUT;
        slot->key = usub::utils::compute_hash128("test_key", 8); // исправил длину "test_key" = 8 символов
        const char* put_value = "test_value";
        slot->value_size = std::strlen(put_value);
        std::cout << "3\n";
        std::memcpy(slot->value, put_value, slot->value_size);
        std::cout << "4\n";
        slot->response_size = 0;
        slot->response_ready.store(0, std::memory_order_relaxed);

        slot->ready.store(1, std::memory_order_release);
        queue->head().store(next_head, std::memory_order_release);

        std::cout << "[CLIENT] PUT command sent.\n";
    }

    std::this_thread::sleep_for(std::chrono::milliseconds(50)); // дать серверу время

    // -------------------
    // FIND Command
    // -------------------
    {
        size_t head = queue->head().load(std::memory_order_relaxed);
        size_t next_head = (head + 1) % queue->capacity();
        while (next_head == queue->tail().load(std::memory_order_acquire))
        {
            std::this_thread::sleep_for(std::chrono::milliseconds(1));
        }

        usub::core::Command* slot = &queue->raw_buffer()[head];

        slot->op = usub::core::OperationType::FIND;
        slot->key = usub::utils::compute_hash128("test_key", 8);
        slot->value_size = 0;
        slot->response_size = 0;
        slot->response_ready.store(0, std::memory_order_relaxed);

        slot->ready.store(1, std::memory_order_release);
        queue->head().store(next_head, std::memory_order_release);

        std::cout << "[CLIENT] FIND command sent.\n";

        // Ожидание ответа
        while (slot->response_ready.load(std::memory_order_acquire) == 0)
        {
            std::this_thread::sleep_for(std::chrono::milliseconds(1));
        }

        if (slot->response_size > 0)
        {
            std::string result(reinterpret_cast<char*>(slot->response), slot->response_size);
            std::cout << "[CLIENT] FIND result: " << result << "\n";
        }
        else
        {
            std::cout << "[CLIENT] FIND result: not found\n";
        }
    }

    munmap(ptr, shm_size);
    close(shm_fd);

    return 0;
}