#include <c_Cond.h>

#if defined(PLATFORM_POSIX)
#include <sys/time.h>
#include <time.h>
#endif

c_err_t c_Cond_Init(c_Cond_t* cond) {
    if (!cond) return C_ERR_PARAM;

#if defined(PLATFORM_WINDOWS)
    // Windows 的条件变量初始化只是一个清零操作，不会失败
    InitializeConditionVariable(&cond->handle);
    cond->is_initialized = C_TRUE;
    return C_ERR_SUCCESS;
#elif defined(PLATFORM_POSIX)
    if (pthread_cond_init(&cond->handle, NULL) == 0) {
        cond->is_initialized = C_TRUE;
        return C_ERR_SUCCESS;
    }
    return C_ERR_FAIL;
#endif
}


void c_Cond_Destroy(c_Cond_t* cond) {
    if (!cond || !cond->is_initialized) return;

#if defined(PLATFORM_WINDOWS)
    // Windows 的 CONDITION_VARIABLE 不需要显式销毁（内核会自动回收）
#elif defined(PLATFORM_POSIX)
    pthread_cond_destroy(&cond->handle);
#endif
    cond->is_initialized = C_FALSE;
}

void c_Cond_Wait(c_Cond_t* cond, c_Mutex_t* mutex) {
    if (!cond || !cond->is_initialized || !mutex || !mutex->is_initialized) return;

#if defined(PLATFORM_WINDOWS)
    // SleepConditionVariableCS 会自动在内部释放传入的锁，并在唤醒时重新重新获取锁
    SleepConditionVariableCS(&cond->handle, &mutex->handle, INFINITE);
#elif defined(PLATFORM_POSIX)
    pthread_cond_wait(&cond->handle, &mutex->handle);
#endif
}

c_bool_t c_Cond_TimedWait(c_Cond_t* cond, c_Mutex_t* mutex, c_uint_t timeout_ms) {
    if (!cond || !cond->is_initialized || !mutex || !mutex->is_initialized) return false;

#if defined(PLATFORM_WINDOWS)
    // 返回非 0 表示成功（收到信号），返回 0 表示超时
    return SleepConditionVariableCS(&cond->handle, &mutex->handle, timeout_ms) != 0;
#elif defined(PLATFORM_POSIX)
    struct timespec ts;
    struct timeval tv;
    gettimeofday(&tv, NULL);

    // 计算绝对终止时间
    long long ns = (long long)tv.tv_usec * 1000 + (long long)timeout_ms * 1000000;
    ts.tv_sec = tv.tv_sec + ns / 1000000000LL;
    ts.tv_nsec = ns % 1000000000LL;

    // 返回 0 表示成功收到信号
    return pthread_cond_timedwait(&cond->handle, &mutex->handle, &ts) == 0;
#endif
}

void c_Cond_Signal(c_Cond_t* cond) {
    if (!cond || !cond->is_initialized) return;

#if defined(PLATFORM_WINDOWS)
    WakeConditionVariable(&cond->handle);
#elif defined(PLATFORM_POSIX)
    pthread_cond_signal(&cond->handle);
#endif
}

void c_Cond_Broadcast(c_Cond_t* cond) {
    if (!cond || !cond->is_initialized) return;

#if defined(PLATFORM_WINDOWS)
    WakeAllConditionVariable(&cond->handle);
#elif defined(PLATFORM_POSIX)
    pthread_cond_broadcast(&cond->handle);
#endif
}