#include <cassert>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <string>
#include <sys/stat.h>
#include <unistd.h>
#include <limits.h>
#include "../native/queue_index/index/priority_queue.h"

// Get absolute path of current working directory
static std::string get_cwd() {
    char buf[PATH_MAX];
    if (getcwd(buf, sizeof(buf)) != nullptr) {
        return std::string(buf);
    }
    return "";
}

// Test: Verify MAX_BATCH_SIZE enforcement (CVE-2025-0838)
static int test_batch_size_limit() {
    printf("  Testing MAX_BATCH_SIZE enforcement (CVE-2025-0838)...\n");
    
    std::string cwd = get_cwd();
    char base_dir[4096];
    snprintf(base_dir, sizeof(base_dir), "%s/test_batch_XXXXXX", cwd.c_str());
    
    if (mkdtemp(base_dir) == nullptr) {
        printf("    ERROR: mkdtemp failed\n");
        return -1;
    }
    
    PriorityQueueIndex index(base_dir);
    if (!index.open()) {
        printf("    ERROR: failed to open index\n");
        rmdir(base_dir);
        return -1;
    }
    
    // Create a batch that exceeds MAX_BATCH_SIZE (10000)
    const uint32_t oversized_batch = 10001;
    qi_task_t* tasks = new qi_task_t[oversized_batch];
    memset(tasks, 0, sizeof(qi_task_t) * oversized_batch);
    
    for (uint32_t i = 0; i < oversized_batch; i++) {
        snprintf(tasks[i].id, sizeof(tasks[i].id), "task_%u", i);
        snprintf(tasks[i].job_name, sizeof(tasks[i].job_name), "job_%u", i);
        snprintf(tasks[i].status, sizeof(tasks[i].status), "pending");
        tasks[i].priority = static_cast<int64_t>(i);
        tasks[i].created_at = 0;
        tasks[i].next_retry = 0;
    }
    
    // Attempt to add oversized batch - should fail
    int result = index.add_tasks(tasks, oversized_batch);
    if (result != -1) {
        printf("    ERROR: add_tasks should have rejected oversized batch\n");
        delete[] tasks;
        index.close();
        rmdir(base_dir);
        return -1;
    }
    
    // Verify error message was set
    const char* error = index.last_error();
    if (!error || strstr(error, "Batch size") == nullptr) {
        printf("    ERROR: expected error message about batch size\n");
        delete[] tasks;
        index.close();
        rmdir(base_dir);
        return -1;
    }
    
    printf("    Oversized batch correctly rejected\n");
    
    // Now try a batch at exactly MAX_BATCH_SIZE - should succeed
    const uint32_t max_batch = 10000;
    qi_task_t* valid_tasks = new qi_task_t[max_batch];
    memset(valid_tasks, 0, sizeof(qi_task_t) * max_batch);
    
    for (uint32_t i = 0; i < max_batch; i++) {
        snprintf(valid_tasks[i].id, sizeof(valid_tasks[i].id), "valid_%u", i);
        snprintf(valid_tasks[i].job_name, sizeof(valid_tasks[i].job_name), "job_%u", i);
        snprintf(valid_tasks[i].status, sizeof(valid_tasks[i].status), "pending");
        valid_tasks[i].priority = static_cast<int64_t>(i);
        valid_tasks[i].created_at = 0;
        valid_tasks[i].next_retry = 0;
    }
    
    // Clear previous error
    index.clear_error();
    
    result = index.add_tasks(valid_tasks, max_batch);
    if (result != static_cast<int>(max_batch)) {
        printf("    ERROR: add_tasks should have accepted max-sized batch\n");
        delete[] tasks;
        delete[] valid_tasks;
        index.close();
        rmdir(base_dir);
        return -1;
    }
    
    printf("    Max-sized batch correctly accepted\n");
    
    // Clean up
    delete[] tasks;
    delete[] valid_tasks;
    index.close();
    rmdir(base_dir);
    
    printf("  MAX_BATCH_SIZE enforcement: PASSED\n");
    return 0;
}

// Test: Verify small batches still work normally
static int test_small_batch() {
    printf("  Testing small batch handling...\n");
    
    std::string cwd = get_cwd();
    char base_dir[4096];
    snprintf(base_dir, sizeof(base_dir), "%s/test_small_XXXXXX", cwd.c_str());
    
    if (mkdtemp(base_dir) == nullptr) {
        printf("    ERROR: mkdtemp failed\n");
        return -1;
    }
    
    PriorityQueueIndex index(base_dir);
    if (!index.open()) {
        printf("    ERROR: failed to open index\n");
        rmdir(base_dir);
        return -1;
    }
    
    // Add a small batch
    const uint32_t small_count = 5;
    qi_task_t tasks[small_count];
    memset(tasks, 0, sizeof(tasks));
    
    for (uint32_t i = 0; i < small_count; i++) {
        snprintf(tasks[i].id, sizeof(tasks[i].id), "small_%u", i);
        snprintf(tasks[i].job_name, sizeof(tasks[i].job_name), "job_%u", i);
        snprintf(tasks[i].status, sizeof(tasks[i].status), "pending");
        tasks[i].priority = static_cast<int64_t>(i);
        tasks[i].created_at = 0;
        tasks[i].next_retry = 0;
    }
    
    int result = index.add_tasks(tasks, small_count);
    if (result != static_cast<int>(small_count)) {
        printf("    ERROR: small batch should have been accepted\n");
        index.close();
        rmdir(base_dir);
        return -1;
    }
    
    // Verify count
    if (index.count() != small_count) {
        printf("    ERROR: count mismatch after adding tasks\n");
        index.close();
        rmdir(base_dir);
        return -1;
    }
    
    printf("    Small batch handled correctly\n");
    
    // Clean up
    index.close();
    rmdir(base_dir);
    
    printf("  Small batch handling: PASSED\n");
    return 0;
}

int main() {
    printf("Testing queue index batch limit (CVE-2025-0838)...\n");
    if (test_batch_size_limit() != 0) return 1;
    if (test_small_batch() != 0) return 1;
    printf("All batch limit tests passed.\n");
    return 0;
}