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

#include "include.h"

_Bool libcdsb_map_update(map_t* x, const void* k, vtype kt, const void* v, vtype vt) {
    int    cmp;
    mnode_t* n;
    mnode_t* p;
    vnode_t kn;

    n  = x->root;
    kn = vnode_tcreate(x->type, k, kt);
    kt = x->type;
    k  = vnode_peek(&kn, kt);

    if (!mnode_is_empty(n)) {
        do {
            p   = n;
            cmp = vtype_compare(k, kt, vnode_peek(&n->key, kt), kt);

            if (cmp == 0) {
                vnode_free(&n->key,   kt);
                vnode_free(&n->value, n->type);

                n->key   = kn;
                n->value = vnode_create(v, vt);
                n->type  = vt;

                return true;
            }

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

        n = mnode_create(kn, p, 1);

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

        if (!mnode_is_root(p))
            mnode_fixup(&x->root, n);

    } else n = x->root = mnode_create(kn, mnode_empty, 0);

    n->value = vnode_create(v, vt);
    n->type  = vt;

    return false;
}


int libcdsb_map_find(map_t* x, const void* k, vtype t, void* _, map_access_callback callback, _Bool cut) {
    mnode_t*  c;
    void   *key;
    int     cmp;

    c = x->root;

    while (!mnode_is_empty(c)) {
        key = vnode_peek(&c->key, x->type);
        cmp = vtype_compare(key, x->type, k, t);

        if (cmp == 0) {
            cmp = (callback) ? callback(key, x->type, vnode_peek(&c->value, c->type), c->type, _) : 0;

            if (cut) {
                c = mnode_delete(&x->root, c);
                vnode_free(&c->key,   x->type);
                vnode_free(&c->value, c->type);
                free(c);
            }

            return cmp;
        }
    }

    return -1;

}


int libcdsb_map_foreach(map_t* x, void* dt, map_access_callback callback, _Bool flush) {
    stack_t  z = { .prev = 0, .value = x->root };
    int      r = 0;
    mnode_t* c;

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

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


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

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

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

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

            c = stack_pop(&z);
        }

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

    return r;
}