#include "context.h"
#include "stack.h"
#include "origin_cs.h"
#include <stdio.h>

typedef struct SingleLinkedStack {
    struct Element* top;
} SingleLinkedStack;

Stack* createSingleLinkedStack() {
    struct Stack* stack = new Stack();
    struct SingleLinkedStack* singleLinkedStack = new SingleLinkedStack();
    stack->stack = singleLinkedStack;
    singleLinkedStack->top = NULL;
    stack->push = pushSingleLinkedStack;
    stack->pop  = popSingleLinkedStack;
    stack->pop2  = pop2SingleLinkedStack;
    stack->get  = getSingleLinkedStack;
    stack->get2  = get2SingleLinkedStack;
    stack->isEmpty = isEmptySingleLinkedStack;
    stack->clear = clearSingleLinkedStack;
    return stack;
}

void printStack1(union Data* data) {
    struct Node* node = &data->element.data->node;
    if (node == NULL) {
        printf("NULL");
    } else {
        printf("key = %d ,", node->key);
        printStack1((union Data*)data->element.next);
    }
}

void printStack(union Data* data) {
    printStack1(data);
    printf("\n");
}

__code clearSingleLinkedStack(struct SingleLinkedStack* stack,__code next(...)) {
    stack->top = NULL;
    goto next(...);
}

__code pushSingleLinkedStack(struct SingleLinkedStack* stack,union Data* data, __code next(...)) {
    Element* element = new Element();
    element->next = stack->top;
    element->data = data;
    stack->top = element;
    goto next(...);
}

__code popSingleLinkedStack(struct SingleLinkedStack* stack, __code next(..., union Data*)) {
    union Data* data; 
    if (stack->top) {
        *data = stack->top->data;
        stack->top = stack->top->next;
    } else {
        *data = NULL;
    }
    goto next(..., data);
}

__code pop2SingleLinkedStack(struct SingleLinkedStack* stack, union Data** data, union Data** data1, __code next(..., union Data**, union Data**)) {
    if (stack->top) {
        *data = stack->top->data;
        stack->top = stack->top->next;
    } else {
        *data = NULL;
    }
    if (stack->top) {
        *data1 = stack->top->data;
        stack->top = stack->top->next;
    } else {
        *data1 = NULL;
    }
    goto next(..., data, data1);
}


__code getSingleLinkedStack(struct SingleLinkedStack* stack, union Data** data, __code next(...)) {
    if (stack->top)
        *data = stack->top->data;
    else
        *data = NULL;
    goto next(...);
}

__code get2SingleLinkedStack(struct SingleLinkedStack* stack,..., __code next(...)) {
    union Data* data, *data1;

    if (stack->top) {
        data = stack->top->data;
        if (stack->top->next) {
            data1 = stack->top->next->data;
        } else {
            data1 = NULL;
        }
    } else {
        data = NULL;
        data1 = NUll;
    }
    goto next(data, data1, ...);
}
    
__code isEmptySingleLinkedStack(struct SingleLinkedStack* stack, __code next(...), __code whenEmpty(...)) {
    if (stack->top)
        goto next(...);
    else
        goto whenEmpty(...);
}