/* meow_bgmgr.c — 批③ 后台管理页 逻辑层（数据汇聚 + kill 门控）。实现见 meow_bgmgr.h。
 * 纯 C（无 launcher static/SDK 依赖），宿主 gcc 直编：gcc -Wall -Wextra -std=gnu99 \
 *   test_bgmgr.c meow_bgmgr.c -o test_bgmgr。 */
#include "meow_bgmgr.h"
#include <stdio.h>
#include <string.h>

int bgmgr_collect(const bgmgr_ops_t *ops, bgmgr_row_t *rows, int max)
{
    if (!ops || !ops->enumerate || !ops->app_meta || !rows || max <= 0) return 0;
    int n = ops->enumerate(ops->ctx, rows, max);
    if (n < 0) n = 0;
    if (n > max) n = max;
    for (int i = 0; i < n; i++) {
        bgmgr_row_t *r = &rows[i];
        r->framework = 0;
        r->is_fg     = 0;
        r->name[0]   = 0;
        r->icon[0]   = 0;
        r->pcpu      = 0.0;
        r->rss_kb    = 0;
        ops->app_meta(ops->ctx, r->app_id, r->pid,
                      r->name, (int)sizeof r->name, r->icon, (int)sizeof r->icon,
                      &r->framework, &r->is_fg);
        if (!r->name[0]) snprintf(r->name, sizeof r->name, "%s", r->app_id);
        if (ops->proc_sample && ops->proc_sample(ops->ctx, r->pid, &r->pcpu, &r->rss_kb) < 0) {
            r->pcpu = 0.0; r->rss_kb = 0;
        }
        r->killable = bgmgr_can_kill(r);
    }
    return n;
}

int bgmgr_can_kill(const bgmgr_row_t *r)
{
    if (!r) return 0;
    if (r->framework) return 0;         /* 框架/系统 App 不 kill（铁律） */
    if (r->is_fg)     return 0;         /* 当前前台 App 不 kill */
    if (r->pid <= 0)  return 0;         /* 非后台/无进程 */
    return 1;
}

int bgmgr_kill_all(const bgmgr_ops_t *ops, bgmgr_row_t *rows, int n,
                   void (*kill_fn)(const char *app_id))
{
    (void)ops;
    if (!kill_fn) return 0;
    int k = 0;
    for (int i = 0; i < n; i++) {
        if (bgmgr_can_kill(&rows[i])) { kill_fn(rows[i].app_id); k++; }
    }
    return k;
}

const char *bgmgr_status_str(const bgmgr_row_t *r)
{
    if (!r) return "";
    if (r->is_fg)     return "前台";
    if (r->keepalive) return "常驻";
    return "后台";
}

const char *bgmgr_mem_str(long rss_kb)
{
    static char buf[24];
    if (rss_kb >= 1024) snprintf(buf, sizeof buf, "%.1fMB", (double)rss_kb / 1024.0);
    else                snprintf(buf, sizeof buf, "%ldKB", rss_kb);
    return buf;
}