#ifndef INCLUDED_OS_SYSTICK_H
#define INCLUDED_OS_SYSTICK_H

#ifndef INCLUDED_OS_TYPES_H
#include <os_types.h>
#endif /*INCLUDED_OS_TYPES_H*/

#ifndef INCLUDED_OS_COMPILER_H
#include <os_compiler.h>
#endif /*INCLUDED_OS_COMPILER_H*/

#ifndef INCLUDED_OS_CRITICAL_H
#include <os_critical.h>
#endif /*INCLUDED_OS_CRITICAL_H*/

#ifndef INCLUDED_OS_SCHED_H
#include <os_sched.h>
#endif /*INCLUDED_OS_SCHED_H*/

#ifndef INCLUDED_OS_YIELD_LIST_H
#include <os_yield_list.h>
#endif /*INCLUDED_OS_YIELD_LIST_H*/

#ifndef INCLUDED_OS_TIMEWHEEL_H
#include <os_timewheel.h>
#endif /*INCLUDED_OS_TIMEWHEEL_H*/


/* ------------------------------------------------------------------------------------------------------------------ */
/*  */

extern volatile os_tick_t g_os_systick_ticks;

/* ------------------------------------------------------------------------------------------------------------------ */
/*  */

OS_STATIC_FORCE_INLINE
void os_systick_tick(void){
    os_critical_enter_in_isr();

    os_bool_t need_sched_flag = OS_FALSE;

    g_os_systick_ticks++;

    if(g_os_sched_current_task_p && g_os_sched_current_task_p->state == kOsTaskState_Running){
        if(g_os_sched_current_task_p->remain_ticks>0
            && (g_os_sched_current_task_p->remain_ticks <= g_os_sched_current_task_p->init_ticks)){
            g_os_sched_current_task_p->remain_ticks--;
            if(g_os_sched_current_task_p->remain_ticks==0){
                // 时间窗用完了
                g_os_sched_current_task_p->remain_ticks = g_os_sched_current_task_p->init_ticks;    // 重置时间窗
                os_yield_list_insert((os_task_t*)g_os_sched_current_task_p);                // 加入yield列表
                need_sched_flag = OS_TRUE;
            }
        }
    }

    os_err_t  err = os_timewheel_tick();
    if(err==OS_TIMEWHEEL_TICK_NEED_SCHEDULE){
        need_sched_flag = OS_TRUE;
    }

    os_critical_leave_in_isr();

    if(need_sched_flag == OS_TRUE){
        os_sched_in_isr();
    }
}

OS_STATIC_FORCE_INLINE
os_tick_t os_systick_get(void){
    return g_os_systick_ticks;
}

OS_STATIC_FORCE_INLINE
os_tick_t os_systick_safe_get(void) {
    os_critical_enter();
    const os_tick_t ticks =  g_os_systick_ticks;
    os_critical_leave();
    return ticks;
}

OS_STATIC_FORCE_INLINE
os_tick_t os_systick_safe_get_in_isr(void) {
    os_critical_enter_in_isr();
    const os_tick_t ticks =  g_os_systick_ticks;
    os_critical_leave_in_isr();
    return ticks;
}

#endif /*INCLUDED_OS_SYSTICK_H*/