#include "animation.h"
#include "stdlib.h"

Animation * AnimationInit(){
    Animation *animation = (Animation *) malloc(sizeof(Animation));
    
    animation->head = 0;
    animation->tail = 0;

    return animation;
}

AnimationFrame * AnimationFrameCreate(Texture2D *texture){
    AnimationFrame *frame = (AnimationFrame *) malloc(sizeof(AnimationFrame));

    frame->texture = texture;
    frame->next = 0;
    frame->prev = 0;

    return frame;
}

void AnimationInsertFront(Animation *animation, Texture2D *texture){
    AnimationFrame *new = AnimationFrameCreate(texture);

    if(animation->head == 0){
        animation->head = new;
        animation->tail = new;

        animation->head->prev = animation->tail;
        animation->tail->next = animation->head->prev;
        
    }
    else if(animation->head == animation->tail){
        animation->head = new;

        animation->head->next = animation->tail;
        animation->head->prev = animation->tail;

        animation->tail->prev = animation->head;
        animation->tail->next = animation->head;
    }
    else{
        animation->head->prev = new;

        new->next = animation->head;
        new->prev = animation->tail;

        animation->tail->next = new;
        animation->head = new;
    }
}

void AnimationInsertBack(Animation *animation, Texture2D *texture){
    AnimationFrame *new = AnimationFrameCreate(texture);

    if(animation->head == 0){
        animation->head = new;
        animation->tail = new;

        animation->head->prev = animation->tail;
        animation->tail->next = animation->head->prev;
    }
    else if(animation->head == animation->tail){
        animation->tail = new;

        animation->head->next = animation->tail;
        animation->head->prev = animation->tail;

        animation->tail->prev = animation->head;
        animation->tail->next = animation->head;
    }
    else{
        animation->tail->next = new;
        new->prev = animation->tail;
        new->next = animation->head;
        animation->head->prev = new;
        animation->tail = new;
    }
}