//! Integration tests for webhook push notifications
//!
//! Tests comprehensive webhook scenarios including:
//! - Successful webhook delivery
//! - Retry logic on failure
//! - Signature verification
//! - Timeout handling
//! - Concurrent webhook sends
//!
//! ## Note on SSRF Prevention
//!
//! **TODO (Issue #277)**: SSRF prevention should be implemented in production code.
//! The implementation should:
//! 1. Block private IP ranges (127.0.0.0/8, 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16)
//! 2. Block link-local addresses (169.254.0.0/16) - AWS/GCP metadata endpoints
//! 3. Block localhost (::1)
//! 4. Block private IPv6 ranges (fc00::/7, fe80::/10)
//!
//! Example implementation location: `crates/miyabi-a2a/src/rpc/push_notification.rs`
//!
//! SSRF tests are included below but currently marked as `#[ignore]` until
//! production code is implemented.

use miyabi_a2a::{
    generate_webhook_signature, send_push_notification, PushNotificationPayload, WebhookConfig,
};
use reqwest::Client;
use wiremock::{
    matchers::{header, header_exists, method, path},
    Mock, MockServer, ResponseTemplate,
};

/// Test successful webhook delivery with all features
#[tokio::test]
async fn test_webhook_delivery_full_features() {
    let mock_server = MockServer::start().await;

    Mock::given(method("POST"))
        .and(path("/webhook"))
        .and(header("Content-Type", "application/json"))
        .and(header("Authorization", "Bearer secret_token"))
        .and(header_exists("X-Miyabi-Signature"))
        .respond_with(ResponseTemplate::new(200))
        .expect(1)
        .mount(&mock_server)
        .await;

    let client = Client::new();
    let config = WebhookConfig::new(format!("{}/webhook", mock_server.uri()))
        .with_bearer_token("secret_token")
        .with_webhook_secret("my-secret-key")
        .with_timeout(30);

    let payload = PushNotificationPayload {
        event_type: "task.completed".to_string(),
        task_id: "task-integration-001".to_string(),
        data: serde_json::json!({
            "status": "completed",
            "result": "success"
        }),
        timestamp: chrono::Utc::now().to_rfc3339(),
    };

    let result = send_push_notification(&client, &config, &payload).await;
    assert!(result.is_ok(), "Full-featured webhook delivery should succeed");
}

/// Test webhook signature generation and verification
#[test]
fn test_webhook_signature_generation() {
    let secret = "integration-test-secret";
    let timestamp = "2025-10-22T12:00:00Z";
    let payload_json =
        r#"{"event_type":"test","task_id":"123","data":{},"timestamp":"2025-10-22T12:00:00Z"}"#;

    let signature = generate_webhook_signature(secret, timestamp, payload_json);

    // Signature should be deterministic
    let signature2 = generate_webhook_signature(secret, timestamp, payload_json);
    assert_eq!(signature, signature2);

    // Signature should be 64 hex characters (SHA256)
    assert_eq!(signature.len(), 64);

    // Different secrets should produce different signatures
    let different_signature =
        generate_webhook_signature("different-secret", timestamp, payload_json);
    assert_ne!(signature, different_signature);
}

/// Test concurrent webhook sends (100 concurrent requests)
#[tokio::test]
async fn test_concurrent_webhook_sends_100() {
    let mock_server = MockServer::start().await;

    // Set up mock to accept 100 concurrent requests
    Mock::given(method("POST"))
        .and(path("/webhook"))
        .respond_with(ResponseTemplate::new(200))
        .expect(100)
        .mount(&mock_server)
        .await;

    let client = Client::new();
    let config = WebhookConfig::new(format!("{}/webhook", mock_server.uri()));

    // Spawn 100 concurrent webhook sends
    let mut handles = vec![];
    for i in 0..100 {
        let client_clone = client.clone();
        let config_clone = config.clone();

        let handle = tokio::spawn(async move {
            let payload = PushNotificationPayload {
                event_type: format!("test.concurrent.{}", i),
                task_id: format!("task-concurrent-{}", i),
                data: serde_json::json!({"index": i}),
                timestamp: chrono::Utc::now().to_rfc3339(),
            };

            send_push_notification(&client_clone, &config_clone, &payload).await
        });

        handles.push(handle);
    }

    // Wait for all tasks to complete
    let results = futures::future::join_all(handles).await;

    // All should succeed
    let mut success_count = 0;
    for result in results {
        if let Ok(Ok(())) = result {
            success_count += 1;
        }
    }

    assert_eq!(success_count, 100, "All 100 concurrent requests should succeed");
}

/// Test load: 1000 concurrent webhook sends
///
/// This test is ignored by default due to long runtime (30+ seconds)
/// Run with: `cargo test --test webhook_integration_tests -- --ignored test_load_1000_concurrent_webhooks`
#[tokio::test]
#[ignore]
async fn test_load_1000_concurrent_webhooks() {
    let mock_server = MockServer::start().await;

    // Set up mock to accept 1000 concurrent requests
    Mock::given(method("POST"))
        .and(path("/webhook"))
        .respond_with(ResponseTemplate::new(200))
        .expect(1000)
        .mount(&mock_server)
        .await;

    let client = Client::new();
    let config = WebhookConfig::new(format!("{}/webhook", mock_server.uri()));

    // Spawn 1000 concurrent webhook sends
    let mut handles = vec![];
    for i in 0..1000 {
        let client_clone = client.clone();
        let config_clone = config.clone();

        let handle = tokio::spawn(async move {
            let payload = PushNotificationPayload {
                event_type: format!("test.load.{}", i),
                task_id: format!("task-load-{}", i),
                data: serde_json::json!({"index": i}),
                timestamp: chrono::Utc::now().to_rfc3339(),
            };

            send_push_notification(&client_clone, &config_clone, &payload).await
        });

        handles.push(handle);
    }

    // Wait for all tasks to complete
    let results = futures::future::join_all(handles).await;

    // Count successes
    let mut success_count = 0;
    for result in results {
        if let Ok(Ok(())) = result {
            success_count += 1;
        }
    }

    // We expect at least 95% success rate (some may fail due to timeouts or resource limits)
    assert!(
        success_count >= 950,
        "Expected >= 950 successes out of 1000, got {}",
        success_count
    );
}

/// Test retry logic with mixed success/failure responses
#[tokio::test]
async fn test_webhook_retry_mixed_responses() {
    use std::sync::atomic::{AtomicU32, Ordering};
    use std::sync::Arc;

    let mock_server = MockServer::start().await;

    // Mock will fail first 2 attempts, then succeed on 3rd
    let counter = Arc::new(AtomicU32::new(0));
    let counter_clone = counter.clone();

    Mock::given(method("POST"))
        .and(path("/webhook"))
        .respond_with(move |_req: &wiremock::Request| {
            let count = counter_clone.fetch_add(1, Ordering::SeqCst);
            if count < 2 {
                ResponseTemplate::new(500)
            } else {
                ResponseTemplate::new(200)
            }
        })
        .expect(3) // 2 failures + 1 success
        .mount(&mock_server)
        .await;

    let client = Client::new();
    let config = WebhookConfig::new(format!("{}/webhook", mock_server.uri()));

    let payload = PushNotificationPayload {
        event_type: "test.retry".to_string(),
        task_id: "task-retry-integration".to_string(),
        data: serde_json::json!({}),
        timestamp: chrono::Utc::now().to_rfc3339(),
    };

    let result = send_push_notification(&client, &config, &payload).await;
    assert!(result.is_ok(), "Webhook should eventually succeed after retries");
}

/// Test timeout handling
#[tokio::test]
async fn test_webhook_timeout_handling() {
    let mock_server = MockServer::start().await;

    // Mock responds with delay longer than timeout
    Mock::given(method("POST"))
        .and(path("/webhook"))
        .respond_with(ResponseTemplate::new(200).set_delay(std::time::Duration::from_secs(5)))
        .expect(4) // Initial + 3 retries (all will timeout)
        .mount(&mock_server)
        .await;

    let client = Client::new();
    let config = WebhookConfig::new(format!("{}/webhook", mock_server.uri())).with_timeout(1); // 1 second timeout

    let payload = PushNotificationPayload {
        event_type: "test.timeout".to_string(),
        task_id: "task-timeout-integration".to_string(),
        data: serde_json::json!({}),
        timestamp: chrono::Utc::now().to_rfc3339(),
    };

    let result = send_push_notification(&client, &config, &payload).await;
    assert!(result.is_err(), "Webhook should fail due to timeout");
}

// ===== SSRF Prevention Tests (Require Production Implementation) =====
//
// The following tests are marked as #[ignore] because SSRF prevention
// is not yet implemented in the production code (Issue #277 requirement).
//
// Once SSRF prevention is implemented in `push_notification.rs`,
// remove the #[ignore] attribute to enable these tests.

/// Test SSRF prevention: localhost (127.0.0.1)
#[tokio::test]
#[ignore] // Remove when SSRF prevention is implemented
async fn test_ssrf_prevention_localhost() {
    let client = Client::new();
    let config = WebhookConfig::new("http://127.0.0.1:8080/webhook");

    let payload = PushNotificationPayload {
        event_type: "test.ssrf".to_string(),
        task_id: "task-ssrf-localhost".to_string(),
        data: serde_json::json!({}),
        timestamp: chrono::Utc::now().to_rfc3339(),
    };

    let result = send_push_notification(&client, &config, &payload).await;
    assert!(result.is_err(), "SSRF: Should block localhost");
}

/// Test SSRF prevention: private network (10.0.0.0/8)
#[tokio::test]
#[ignore] // Remove when SSRF prevention is implemented
async fn test_ssrf_prevention_private_10() {
    let client = Client::new();
    let config = WebhookConfig::new("http://10.0.0.1/webhook");

    let payload = PushNotificationPayload {
        event_type: "test.ssrf".to_string(),
        task_id: "task-ssrf-10".to_string(),
        data: serde_json::json!({}),
        timestamp: chrono::Utc::now().to_rfc3339(),
    };

    let result = send_push_notification(&client, &config, &payload).await;
    assert!(result.is_err(), "SSRF: Should block 10.0.0.0/8");
}

/// Test SSRF prevention: private network (192.168.0.0/16)
#[tokio::test]
#[ignore] // Remove when SSRF prevention is implemented
async fn test_ssrf_prevention_private_192() {
    let client = Client::new();
    let config = WebhookConfig::new("http://192.168.1.1/webhook");

    let payload = PushNotificationPayload {
        event_type: "test.ssrf".to_string(),
        task_id: "task-ssrf-192".to_string(),
        data: serde_json::json!({}),
        timestamp: chrono::Utc::now().to_rfc3339(),
    };

    let result = send_push_notification(&client, &config, &payload).await;
    assert!(result.is_err(), "SSRF: Should block 192.168.0.0/16");
}

/// Test SSRF prevention: link-local (169.254.169.254 - AWS/GCP metadata)
#[tokio::test]
#[ignore] // Remove when SSRF prevention is implemented
async fn test_ssrf_prevention_metadata_endpoint() {
    let client = Client::new();
    let config = WebhookConfig::new("http://169.254.169.254/latest/meta-data/");

    let payload = PushNotificationPayload {
        event_type: "test.ssrf".to_string(),
        task_id: "task-ssrf-metadata".to_string(),
        data: serde_json::json!({}),
        timestamp: chrono::Utc::now().to_rfc3339(),
    };

    let result = send_push_notification(&client, &config, &payload).await;
    assert!(result.is_err(), "SSRF: Should block AWS/GCP metadata endpoint");
}

/// Test SSRF prevention: IPv6 localhost (::1)
#[tokio::test]
#[ignore] // Remove when SSRF prevention is implemented
async fn test_ssrf_prevention_ipv6_localhost() {
    let client = Client::new();
    let config = WebhookConfig::new("http://[::1]:8080/webhook");

    let payload = PushNotificationPayload {
        event_type: "test.ssrf".to_string(),
        task_id: "task-ssrf-ipv6".to_string(),
        data: serde_json::json!({}),
        timestamp: chrono::Utc::now().to_rfc3339(),
    };

    let result = send_push_notification(&client, &config, &payload).await;
    assert!(result.is_err(), "SSRF: Should block IPv6 localhost");
}
