#include <stdio.h>
#include <stdlib.h>
#include <sys/resource.h>

// Dummy function for system malloc
void hak_tiny_magazine_flush_all(void) { /* no-op */ }

void battle_test(int n, const char* label) {
    struct rusage usage;
    void** ptrs = malloc(n * sizeof(void*));
    
    printf("\n=== %s Test (n=%d) ===\n", label, n);
    
    // Allocate
    for (int i = 0; i < n; i++) {
        ptrs[i] = malloc(16);
    }
    
    // Measure at peak
    getrusage(RUSAGE_SELF, &usage);
    float data_mb = (n * 16) / 1024.0 / 1024.0;
    float rss_mb = usage.ru_maxrss / 1024.0;
    float overhead = (rss_mb - data_mb) / data_mb * 100;
    
    printf("Peak:  %.1f MB data → %.1f MB RSS (%.0f%% overhead)\n", 
           data_mb, rss_mb, overhead);
    
    // Free all
    for (int i = 0; i < n; i++) {
        free(ptrs[i]);
    }
    
    // Flush (no-op for system malloc)
    hak_tiny_magazine_flush_all();
    
    // Measure after free
    getrusage(RUSAGE_SELF, &usage);
    float rss_after = usage.ru_maxrss / 1024.0;
    printf("After: %.1f MB RSS (%.1f MB freed)\n", 
           rss_after, rss_mb - rss_after);
    
    free(ptrs);
}

int main() {
    printf("╔════════════════════════════════════════╗\n");
    printf("║      System malloc / mimalloc          ║\n");
    printf("╚════════════════════════════════════════╝\n");
    
    battle_test(100000, "100K");
    battle_test(500000, "500K");
    battle_test(1000000, "1M");
    battle_test(2000000, "2M");
    battle_test(5000000, "5M");
    
    printf("\n╔════════════════════════════════════════╗\n");
    printf("║          BATTLE COMPLETE!              ║\n");
    printf("╚════════════════════════════════════════╝\n");
    
    return 0;
}