#include <gai_fsm.h>

static os_int_t FindNextState(gai_fsm_t* self, os_list_t* transitions, void* ud){
    os_list_node_t * p_node = 0;
    for(p_node = transitions->next; p_node!=transitions; p_node= p_node->next){
        gai_fsm_transition_t* p_transition = os_list_member_of(p_node, gai_fsm_transition_t, node);
        if(p_transition->evaluator(self, p_transition, ud)){
            return p_transition->to_state_id;
        }
    }
    return -1;
}

void gai_fsm_update(gai_fsm_t* self, void* userdata){
    if(!self->current_state_p){
        return;
    }
    gai_action_status_t status = gai_fsm_status(self);
    if(status==kGaiActionStatus_Running){
        gai_action_Update(&self->current_state_p->action, userdata);
    }else if(status==kGaiActionStatus_Terminated){
        os_int_t to_state_id = FindNextState(self, &self->current_state_p->transition_list, userdata);
        gai_fsm_state_t* p_next_state = gai_fsm_find_state(self, to_state_id);
        if(p_next_state){
            gai_action_Cleanup(&self->current_state_p->action);
            self->current_state_p = p_next_state;
            gai_action_Initialize(&self->current_state_p->action);
        }
    }
}