use serde_json::json;

// ============================================================================
// M3.5.7 — Rate limiting per-apikey per-endpoint + idempotency
// ============================================================================
//
// 8 tests covering rate limiting strategy and idempotency
//

#[test]
fn r1_rate_limits_per_endpoint() {
    let limits = json!({
        "POST /memory/ingest": 100,
        "GET /memory/query": 1000,
        "GET /memory/skills": -1,
        "GET /memory/projects": 100
    });

    assert_eq!(limits["POST /memory/ingest"], 100);
    assert_eq!(limits["GET /memory/query"], 1000);
    assert_eq!(limits["GET /memory/skills"], -1);
}

#[test]
fn r2_rate_limits_per_apikey() {
    let api_key_1 = "key-abc";
    let api_key_2 = "key-xyz";
    
    let mut counters = std::collections::HashMap::new();
    counters.insert(api_key_1, 5);
    counters.insert(api_key_2, 2);
    
    assert_eq!(counters[api_key_1], 5);
    assert_eq!(counters[api_key_2], 2);
}

#[test]
fn r3_burst_allowance() {
    let burst_capacity: u32 = 10;
    let requests_in_burst = vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
    
    assert!(requests_in_burst.len() as u32 <= burst_capacity);
    
    let request_11 = 11;
    assert!(request_11 as u32 > burst_capacity);
}

#[test]
fn r4_429_response_on_rate_limit() {
    let response = json!({
        "status": 429,
        "error": "rate_limit_exceeded",
        "reason": "100 requests/hour for POST /memory/ingest",
        "retry_after_seconds": 47
    });

    assert_eq!(response["status"], 429);
    assert_eq!(response["error"], "rate_limit_exceeded");
    assert!(response["retry_after_seconds"].is_number());
}

#[test]
fn r5_retry_after_header() {
    let retry_after_seconds = 47u32;
    assert!(retry_after_seconds > 0 && retry_after_seconds <= 3600);
}

#[test]
fn r6_idempotency_by_ingest_id() {
    let ingest_id = "abc123def456abc123def456abc123def456abc123def456abc123def456ab00";
    
    let job_id_1 = "ingest-uuid-1";
    let job_id_2 = "ingest-uuid-1";
    
    assert_eq!(job_id_1, job_id_2);
    
    let ingest_id_2 = "abc123def456abc123def456abc123def456abc123def456abc123def456ab01";
    let job_id_3 = "ingest-uuid-2";
    
    assert_ne!(job_id_1, job_id_3);
}

#[test]
fn r7_idempotency_ttl_24_hours() {
    let created_at: u64 = 1000000;
    let queried_at_fresh: u64 = 1000000 + 3600; // 1 hour later (fresh)
    let queried_at_expired: u64 = 1000000 + (86400 * 2); // 2 days later (expired)
    
    let ttl_seconds: u64 = 86400; // 24 hours
    
    let elapsed_fresh = queried_at_fresh - created_at;
    let elapsed_expired = queried_at_expired - created_at;
    
    assert!(elapsed_fresh < ttl_seconds, "1 hour should be within TTL");
    assert!(elapsed_expired > ttl_seconds, "2 days should exceed TTL");
}

#[test]
fn r8_token_bucket_model() {
    // Token bucket refill model
    // Capacity: 100 tokens
    // Refill rate: 100/3600 tokens/sec (100/hour)
    // Cost per request: 1 token
    
    let capacity: f32 = 100.0;
    let refill_rate: f32 = 100.0 / 3600.0; // ~0.0278 tokens/sec
    let cost_per_request: f32 = 1.0;
    
    // Simulate tokens over time
    let mut tokens: f32 = capacity;
    
    // After 1 hour, bucket refilled
    let elapsed_1hour: f32 = 3600.0;
    let refilled_1hour: f32 = (elapsed_1hour * refill_rate).min(capacity);
    tokens = (tokens + refilled_1hour).min(capacity);
    
    assert!(tokens >= 50.0 && tokens <= capacity);
    
    // Make a request (costs 1 token)
    tokens -= cost_per_request;
    assert!(tokens < capacity);
}