#include "tlibc/collections/LList.h"

LLNode_* _LList_detatch(LList_* l, LLNode_* n){
    if(n == l->first){
        l->first = n->next;
    }
    else {
        assert(n->prev != NULL);
        n->prev->next = n->next;
    }

    if(n == l->last){
        l->last = n->prev;
    }
    else {
        assert(n->next != NULL);
        n->next->prev = n->prev;
    }

    l->count--;
    n->prev = NULL;
    n->next = NULL;
    return n;
}

void _LList_insertAfter(LList_* l, NULLABLE(LLNode_*) target, LLNode_* detatched)
{
    if(target == NULL){
        assert(l->first == NULL && l->last == NULL);
        l->first = detatched;
        l->last = detatched;
        return;
    }

    detatched->prev = target;
    detatched->next = target->next;
    target->next = detatched;
    if(detatched->next){
        detatched->next->prev = detatched;
    }
}

void _LList_insertBefore(LList_* l, NULLABLE(LLNode_*) target, LLNode_* detatched)
{
    if(target == NULL){
        assert(l->first == NULL && l->last == NULL);
        l->first = detatched;
        l->last = detatched;
        return;
    }

    detatched->prev = target->prev;
    detatched->next = target;
    target->prev = detatched;
    if(detatched->prev){
        detatched->prev->next = detatched;
    }
}