#include "tool.h"
#include "exit_.h"
#include "mutex"

namespace aFuntool {
    static const int exit_func_size = 1024;
    static std::mutex exit_mutex;
    struct ExitFuncData {
        aFunExitFunc *func;
        void *data;
    } exit_func[exit_func_size];

    /**
     * 退出程序
     * @param exit_code 退出代码
     */
    [[noreturn]] void aFunExit(int exit_code){
        std::unique_lock<std::mutex> ul{exit_mutex};
        for (int i = exit_func_size - 1; i >= 0; i--) {
            if (exit_func[i].func != nullptr)
                exit_func[i].func(exit_func[i].data);
        }
        ul.unlock();
        exit(exit_code);
    }

    /**
     * 尝试执行退出函数
     */
    int aFunTryExitPseudo(){
        if (exit_mutex.try_lock()) {
            std::unique_lock<std::mutex> ul{exit_mutex, std::adopt_lock};
            for (int i = exit_func_size - 1; i >= 0; i--) {
                if (exit_func[i].func != nullptr)
                    exit_func[i].func(exit_func[i].data);
                exit_func[i].func = nullptr;
                exit_func[i].data = nullptr;
            }
            return 1;
        }
        return 0;
    }

    /**
     * 执行退出函数, 但不退出
     */
    int aFunExitPseudo(){
        std::unique_lock<std::mutex> ul{exit_mutex};
        for (int i = exit_func_size - 1; i >= 0; i--) {
            if (exit_func[i].func != nullptr)
                exit_func[i].func(exit_func[i].data);
            exit_func[i].func = nullptr;
            exit_func[i].data = nullptr;
        }
        return 0;
    }

    /**
     * 尝试注册退出函数, 若锁占用则返回-1
     * @param func 退出函数
     * @param data 参数
     */
    int aFunAtExitTry(aFunExitFunc *func, void *data){
        if (exit_mutex.try_lock()) {
            std::unique_lock<std::mutex> ul{exit_mutex, std::adopt_lock};
            struct ExitFuncData *tmp = exit_func;
            int count = 0;
            for (NULL; tmp->func != nullptr; tmp++, count++) {
                if (count >= exit_func_size) {
                    return -1;
                }
            }
            tmp->func = func;
            tmp->data = data;
            return count;
        }
        return -1;
    }

    /**
     * 注册退出函数, aFun退出函数会在atexit退出函数之前执行
     * @param func 退出函数
     * @param data 参数
     * @return
     */
    int aFunAtExit(aFunExitFunc *func, void *data){
        std::unique_lock<std::mutex> ul{exit_mutex};
        struct ExitFuncData *tmp = exit_func;
        int count = 0;
        for (NULL; tmp->func != nullptr; tmp++, count++) {
            if (count >= exit_func_size) {
                return -1;
            }
        }
        tmp->func = func;
        tmp->data = data;
        return count;
    }
}