/* This software is licensed by the MIT License, see LICENSE file */
/*                                Copyright © 2022 Gregory Lirent */

#include "../../include/extra/set.h"
#include "../__internal/rbtree.h"

_Bool libcdsb_vset_find(val_t* x, set_t* s, const void* v, vtype t, _Bool cut) {
    rbnode_t* c;
    int     cmp;

    c = s->root;

    while (!rbnode_is_empty(c)) {

        cmp = vtype_compare(vnode_peek(&c->value, s->type), s->type, v, t);

        if (cmp == 0) {
            if (cut) {
                c = rbnode_delete(&s->root, c);
                if (!is_null(x)) {
                    value_set(x, c->value, s->type, VF_WRITEABLE|VF_REMOVABLE);
                } else vnode_free(&c->value, s->type);
                free(c);
            } else if (!is_null(x)) value_set(x, c->value, s->type, VF_UNDEFINED);

            return true;
        }

        c = (cmp < 0) ? c->right : c->left;
    }
    return rbnode_empty;
}


_Bool libcdsb_vset_insert(set_t* x, const void* v, vtype t) {
    int     cmp;
    rbnode_t* n;
    rbnode_t* p;
    vnode_t  vn;

    n  = x->root;
    vn = vnode_tcreate(x->type, v, t);
    t  = x->type;
    v  = vnode_peek(&vn, t);

    if (!rbnode_is_empty(n)) {
        do {
            p   = n;
            cmp = vtype_compare(v, t, vnode_peek(&n->value, t), t);

            if (cmp == 0) {
                vnode_free(&vn, t);
                return false;
            }

            n = (cmp < 0) ? n->left : n->right;
        } while (!rbnode_is_empty(n));

        n = rbnode_create(vn, p, 1);

        if (cmp < 0) p->left  = n;
        else         p->right = n;

        if (!rbnode_is_root(p))
            rbnode_fixup(&x->root, n);

    } else n = x->root = rbnode_create(vn, rbnode_empty, 0);

    return true;
}


int libcdsb_vset_foreach(set_t* x, void* data, vset_foreach_callback callback, _Bool flush) {
    stack_t   z = { .prev = 0, .value = x->root };
    int       r = 0;
    rbnode_t* c;

    if (rbnode_is_empty(x->root)) return 0;

    while ((c = stack_pop(&z))) {
        if ((r = callback(vnode_peek(&c->value, x->type), x->type, data)))
            break;


        if (!rbnode_is_empty(c->right)) stack_push(&z, c->right);
        if (!rbnode_is_empty(c->left))  stack_push(&z, c->left);

        if (flush) {
            vnode_free(&c->value, x->type);
            free(c);
        }
    }

    if (flush) {
        while (c) {
            if (!rbnode_is_empty(c->right)) stack_push(&z, c->right);
            if (!rbnode_is_empty(c->left))  stack_push(&z, c->left);

            vnode_free(&c->value, x->type);
            free(c);

            c = stack_pop(&z);
        }

        memset(x, 0, sizeof(*x));
    } else stack_flush(&z);

    return r;
}