#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include "se050_tai64n.h"

static void print_hex(const char *label, const uint8_t *buf, size_t len)
{
    printf("%s: ", label);
    for (size_t i = 0; i < len; i++) printf("%02x", buf[i]);
    printf("\n");
}

int main(void)
{
    uint8_t timestamp[TAI64N_SIZE];
    uint64_t seconds;
    uint32_t nanoseconds;
    int passed = 0;

    printf("TAI64N Test Suite\n=================\n\n");

    printf("Test 1: Encode Unix Epoch\n");
    se050_tai64n_encode(timestamp, 0, 0);
    print_hex("TAI64N", timestamp, 12);
    se050_tai64n_decode(&seconds, &nanoseconds, timestamp);
    printf("Decoded: seconds=%llu, nanoseconds=%u\n", 
           (unsigned long long)seconds, nanoseconds);
    if (seconds == 0 && nanoseconds == 0) {
        printf("[PASS]\n\n"); passed++;
    } else {
        printf("[FAIL]\n\n");
    }

    printf("Test 2: Encode Current Time\n");
    se050_tai64n_now(timestamp);
    print_hex("TAI64N", timestamp, 12);
    se050_tai64n_decode(&seconds, &nanoseconds, timestamp);
    printf("Decoded: seconds=%llu, nanoseconds=%u\n", 
           (unsigned long long)seconds, nanoseconds);
    printf("[INFO] Computed\n\n"); passed++;

    printf("Test 3: Specific Time\n");
    se050_tai64n_encode(timestamp, 1609459200, 123456789);
    print_hex("TAI64N", timestamp, 12);
    se050_tai64n_decode(&seconds, &nanoseconds, timestamp);
    printf("Decoded: seconds=%llu, nanoseconds=%u\n", 
           (unsigned long long)seconds, nanoseconds);
    if (seconds == 1609459200 && nanoseconds == 123456789) {
        printf("[PASS]\n\n"); passed++;
    } else {
        printf("[FAIL]\n\n");
    }

    printf("Test 4: Window Check\n");
    se050_tai64n_now(timestamp);
    int result = se050_tai64n_check_window(timestamp, 60);
    printf("Window check (60s): %s\n", 
           result == 0 ? "PASS (within window)" : 
           result == -1 ? "FAIL (too old)" : "FAIL (too far future)");
    if (result == 0) {
        printf("[PASS]\n\n"); passed++;
    } else {
        printf("[FAIL]\n\n");
    }

    printf("=================\n");
    printf("Passed: %d/4\n=================\n", passed);
    return 0;
}