// smallobject_cold_iface_v1.h - Cold interface wrapper for SmallObject HotBox v3
// 役割:
//   - SmallObject Hot Box (v3) と既存 v1 Tiny Cold 層の境界を 1 箇所にまとめる。
//   - Phase A: C7 の refill/retire だけを v1 TinyHeap へラップする。
#pragma once

#include <stdint.h>
#include <stdlib.h>
#include "tiny_heap_box.h"
#include "smallobject_hotbox_v3_box.h"
#include "../hakmem_tiny.h"  // TINY_SLAB_SIZE for slab base mask

struct so_page_v3;

typedef struct SmallObjectColdIface {
    struct so_page_v3* (*refill_page)(void* cold_ctx, uint32_t class_idx);
    void (*retire_page)(void* cold_ctx, uint32_t class_idx, struct so_page_v3* page);
} SmallObjectColdIface;

static inline struct so_page_v3* smallobject_cold_refill_page_v1(void* cold_ctx, uint32_t class_idx) {
    if (class_idx != 7 && class_idx != 6) {
        return NULL;  // Phase A-2: C7/C6 のみ対応
    }
    tiny_heap_ctx_t* ctx = cold_ctx ? (tiny_heap_ctx_t*)cold_ctx : tiny_heap_ctx_for_thread();
    if (!ctx) return NULL;
    tiny_heap_page_t* lease = tiny_heap_prepare_page(ctx, (int)class_idx);
    if (!lease) return NULL;

    so_page_v3* page = (so_page_v3*)calloc(1, sizeof(so_page_v3));
    if (!page) return NULL;

    page->lease_page = lease;
    page->meta = lease->meta;
    page->ss = lease->ss;
    page->slab_idx = lease->slab_idx;
    page->base = lease->base;
    page->capacity = lease->capacity;
    page->block_size = (uint32_t)tiny_stride_for_class((int)class_idx);
    page->class_idx = class_idx;
    page->slab_ref = lease;
    return page;
}

static inline void smallobject_cold_retire_page_v1(void* cold_ctx, uint32_t class_idx, struct so_page_v3* page) {
    if (!page || (class_idx != 7 && class_idx != 6)) {
        if (page) {
            free(page);
        }
        return;
    }
    tiny_heap_ctx_t* ctx = cold_ctx ? (tiny_heap_ctx_t*)cold_ctx : tiny_heap_ctx_for_thread();
    if (!ctx) {
        free(page);
        return;
    }
    tiny_heap_page_t* lease = page->lease_page;
    if (!lease) {
        free(page);
        return;
    }

    lease->base = (uint8_t*)page->base;
    lease->capacity = (uint16_t)page->capacity;
    lease->used = (uint16_t)page->used;
    lease->meta = page->meta;
    lease->ss = page->ss;
    lease->slab_idx = page->slab_idx;
    lease->free_list = page->freelist;

    tiny_heap_page_becomes_empty(ctx, (int)class_idx, lease);
    free(page);
}

static inline SmallObjectColdIface smallobject_cold_iface_v1(void) {
    SmallObjectColdIface iface = {
        .refill_page = smallobject_cold_refill_page_v1,
        .retire_page = smallobject_cold_retire_page_v1,
    };
    return iface;
}