//! Integration tests for the settings endpoints.
//!
//! Tests GET and PUT /api/v1/settings, including authentication,
//! validation, defaults, and per-user isolation.
//!
//! Requires a running Postgres instance. Set `TEST_DATABASE_URL` to run.

mod common;

use axum::http::StatusCode;

fn require_test_db() -> bool {
    std::env::var("TEST_DATABASE_URL").is_ok()
}

// ── Auth requirement ─────────────────────────────────────────────────────

#[tokio::test]
async fn get_settings_without_auth_returns_401() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let (status, body) = app.get_with_session("/api/v1/settings", "invalid-session-token").await;

    assert_eq!(
        status,
        StatusCode::UNAUTHORIZED,
        "GET /settings without auth should return 401"
    );
    assert_eq!(body["error"], "unauthorized");
}

#[tokio::test]
async fn put_settings_without_auth_returns_401() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let body = serde_json::json!({
        "theme": "Test",
        "max_age_days": 7,
        "categories": ["Cat"],
        "max_items_per_category": 4,
        "max_articles_per_source": 3,
        "use_llm_for_source_links": false,
        "use_brave_search": false,
        "article_history_days": 90,
        "batch_size": 5,
        "summary_length": 3,
        "source_extraction_window": 3,
        "search_agent_behavior": "",
        "ai_provider": "",
        "ai_model": "",
        "ai_model_websearch": "",
        "rate_limit_max_requests": null,
        "rate_limit_time_window_seconds": null
    });

    // PUT without a session cookie
    let req = axum::http::Request::builder()
        .method(axum::http::Method::PUT)
        .uri("/api/v1/settings")
        .header("Content-Type", "application/json")
        .header("X-Requested-With", "XMLHttpRequest")
        .body(axum::body::Body::from(serde_json::to_vec(&body).unwrap()))
        .unwrap();

    let response = app.raw_request(req).await;
    assert_eq!(
        response.status(),
        StatusCode::UNAUTHORIZED,
        "PUT /settings without auth should return 401"
    );
}

// ── Default settings ─────────────────────────────────────────────────────

#[tokio::test]
async fn get_settings_returns_defaults_on_first_access() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let (_user_id, session) = app
        .create_authenticated_user("settings-default@example.com")
        .await;

    let (status, body) = app.get_with_session("/api/v1/settings", &session).await;

    assert_eq!(status, StatusCode::OK, "GET /settings should return 200");
    assert_eq!(
        body["theme"], "Intelligence Artificielle",
        "Default theme should be 'Intelligence Artificielle'"
    );
    assert_eq!(
        body["max_age_days"], 7,
        "Default max_age_days should be 7"
    );
    assert_eq!(
        body["max_items_per_category"], 4,
        "Default max_items_per_category should be 4"
    );

    // Check default categories
    let categories = body["categories"].as_array().expect("categories should be an array");
    assert_eq!(categories.len(), 5, "Default should have 5 categories");
    assert_eq!(categories[0], "Annonces majeures");
}

// ── Update settings ──────────────────────────────────────────────────────

#[tokio::test]
async fn put_settings_with_valid_data_returns_200() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let (_user_id, session) = app
        .create_authenticated_user("settings-update@example.com")
        .await;

    let update = serde_json::json!({
        "theme": "Cybersecurite",
        "max_age_days": 14,
        "categories": ["Vulnerabilites", "Patch Tuesday", "Threat Intel"],
        "max_items_per_category": 6,
        "max_articles_per_source": 3,
        "use_llm_for_source_links": false,
        "use_brave_search": false,
        "article_history_days": 90,
        "batch_size": 5,
        "summary_length": 3,
        "source_extraction_window": 3,
        "search_agent_behavior": "Focus on CVEs",
        "ai_provider": "",
        "ai_model": "",
        "ai_model_websearch": "",
        "rate_limit_max_requests": null,
        "rate_limit_time_window_seconds": null
    });

    let (status, body) = app
        .put_with_session("/api/v1/settings", &update, &session)
        .await;

    assert_eq!(
        status,
        StatusCode::OK,
        "PUT /settings with valid data should return 200"
    );
    assert_eq!(body["theme"], "Cybersecurite");
    assert_eq!(body["max_age_days"], 14);
    assert_eq!(body["max_items_per_category"], 6);
    assert_eq!(body["search_agent_behavior"], "Focus on CVEs");

    let categories = body["categories"].as_array().expect("categories array");
    assert_eq!(categories.len(), 3);
    assert_eq!(categories[0], "Vulnerabilites");
    assert_eq!(categories[1], "Patch Tuesday");
    assert_eq!(categories[2], "Threat Intel");
}

#[tokio::test]
async fn put_then_get_returns_updated_data() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let (_user_id, session) = app
        .create_authenticated_user("settings-roundtrip@example.com")
        .await;

    // First, trigger default creation
    let (status, _) = app.get_with_session("/api/v1/settings", &session).await;
    assert_eq!(status, StatusCode::OK);

    // Update
    let update = serde_json::json!({
        "theme": "Economie",
        "max_age_days": 30,
        "categories": ["Macro", "Finance"],
        "max_items_per_category": 10,
        "max_articles_per_source": 3,
        "use_llm_for_source_links": false,
        "use_brave_search": false,
        "article_history_days": 90,
        "batch_size": 5,
        "summary_length": 3,
        "source_extraction_window": 3,
        "search_agent_behavior": "Francophone sources",
        "ai_provider": "",
        "ai_model": "",
        "ai_model_websearch": "",
        "rate_limit_max_requests": null,
        "rate_limit_time_window_seconds": null
    });
    let (put_status, _) = app
        .put_with_session("/api/v1/settings", &update, &session)
        .await;
    assert_eq!(put_status, StatusCode::OK);

    // GET again — should reflect the update
    let (get_status, body) = app.get_with_session("/api/v1/settings", &session).await;
    assert_eq!(get_status, StatusCode::OK);
    assert_eq!(body["theme"], "Economie");
    assert_eq!(body["max_age_days"], 30);
    assert_eq!(body["max_items_per_category"], 10);
    assert_eq!(body["search_agent_behavior"], "Francophone sources");

    let categories = body["categories"].as_array().expect("categories array");
    assert_eq!(categories.len(), 2);
    assert_eq!(categories[0], "Macro");
    assert_eq!(categories[1], "Finance");
}

// ── Validation errors ────────────────────────────────────────────────────

#[tokio::test]
async fn put_settings_empty_theme_returns_422() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let (_user_id, session) = app
        .create_authenticated_user("settings-val-theme@example.com")
        .await;

    let update = serde_json::json!({
        "theme": "   ",
        "max_age_days": 7,
        "categories": ["Cat"],
        "max_items_per_category": 4,
        "max_articles_per_source": 3,
        "use_llm_for_source_links": false,
        "use_brave_search": false,
        "article_history_days": 90,
        "batch_size": 5,
        "summary_length": 3,
        "source_extraction_window": 3,
        "search_agent_behavior": "",
        "ai_provider": "",
        "ai_model": "",
        "ai_model_websearch": "",
        "rate_limit_max_requests": null,
        "rate_limit_time_window_seconds": null
    });
    let (status, body) = app
        .put_with_session("/api/v1/settings", &update, &session)
        .await;

    assert_eq!(
        status,
        StatusCode::UNPROCESSABLE_ENTITY,
        "Empty theme should return 422"
    );
    assert_eq!(body["error"], "validation_error");
}

#[tokio::test]
async fn put_settings_too_many_categories_returns_422() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let (_user_id, session) = app
        .create_authenticated_user("settings-val-cats@example.com")
        .await;

    let categories: Vec<String> = (0..21).map(|i| format!("Cat {}", i)).collect();
    let update = serde_json::json!({
        "theme": "AI",
        "max_age_days": 7,
        "categories": categories,
        "max_items_per_category": 4,
        "max_articles_per_source": 3,
        "use_llm_for_source_links": false,
        "use_brave_search": false,
        "article_history_days": 90,
        "batch_size": 5,
        "summary_length": 3,
        "source_extraction_window": 3,
        "search_agent_behavior": "",
        "ai_provider": "",
        "ai_model": "",
        "ai_model_websearch": "",
        "rate_limit_max_requests": null,
        "rate_limit_time_window_seconds": null
    });
    let (status, body) = app
        .put_with_session("/api/v1/settings", &update, &session)
        .await;

    assert_eq!(
        status,
        StatusCode::UNPROCESSABLE_ENTITY,
        "More than 20 categories should return 422"
    );
    assert_eq!(body["error"], "validation_error");
}

#[tokio::test]
async fn put_settings_empty_categories_returns_422() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let (_user_id, session) = app
        .create_authenticated_user("settings-val-empty-cats@example.com")
        .await;

    let update = serde_json::json!({
        "theme": "AI",
        "max_age_days": 7,
        "categories": [],
        "max_items_per_category": 4,
        "max_articles_per_source": 3,
        "use_llm_for_source_links": false,
        "use_brave_search": false,
        "article_history_days": 90,
        "batch_size": 5,
        "summary_length": 3,
        "source_extraction_window": 3,
        "search_agent_behavior": "",
        "ai_provider": "",
        "ai_model": "",
        "ai_model_websearch": "",
        "rate_limit_max_requests": null,
        "rate_limit_time_window_seconds": null
    });
    let (status, body) = app
        .put_with_session("/api/v1/settings", &update, &session)
        .await;

    assert_eq!(
        status,
        StatusCode::UNPROCESSABLE_ENTITY,
        "Empty categories array should return 422"
    );
    assert_eq!(body["error"], "validation_error");
}

#[tokio::test]
async fn put_settings_max_age_days_out_of_range_returns_422() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let (_user_id, session) = app
        .create_authenticated_user("settings-val-age@example.com")
        .await;

    // Below range
    let update = serde_json::json!({
        "theme": "AI",
        "max_age_days": 0,
        "categories": ["Cat"],
        "max_items_per_category": 4,
        "max_articles_per_source": 3,
        "use_llm_for_source_links": false,
        "use_brave_search": false,
        "article_history_days": 90,
        "batch_size": 5,
        "summary_length": 3,
        "source_extraction_window": 3,
        "search_agent_behavior": "",
        "ai_provider": "",
        "ai_model": "",
        "ai_model_websearch": "",
        "rate_limit_max_requests": null,
        "rate_limit_time_window_seconds": null
    });
    let (status, _) = app
        .put_with_session("/api/v1/settings", &update, &session)
        .await;
    assert_eq!(
        status,
        StatusCode::UNPROCESSABLE_ENTITY,
        "max_age_days=0 should return 422"
    );

    // Above range
    let update2 = serde_json::json!({
        "theme": "AI",
        "max_age_days": 366,
        "categories": ["Cat"],
        "max_items_per_category": 4,
        "max_articles_per_source": 3,
        "use_llm_for_source_links": false,
        "use_brave_search": false,
        "article_history_days": 90,
        "batch_size": 5,
        "summary_length": 3,
        "source_extraction_window": 3,
        "search_agent_behavior": "",
        "ai_provider": "",
        "ai_model": "",
        "ai_model_websearch": "",
        "rate_limit_max_requests": null,
        "rate_limit_time_window_seconds": null
    });
    let (status2, _) = app
        .put_with_session("/api/v1/settings", &update2, &session)
        .await;
    assert_eq!(
        status2,
        StatusCode::UNPROCESSABLE_ENTITY,
        "max_age_days=366 should return 422"
    );
}

#[tokio::test]
async fn put_settings_max_items_out_of_range_returns_422() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let (_user_id, session) = app
        .create_authenticated_user("settings-val-items@example.com")
        .await;

    let update = serde_json::json!({
        "theme": "AI",
        "max_age_days": 7,
        "categories": ["Cat"],
        "max_items_per_category": 51,
        "max_articles_per_source": 3,
        "use_llm_for_source_links": false,
        "use_brave_search": false,
        "article_history_days": 90,
        "batch_size": 5,
        "summary_length": 3,
        "source_extraction_window": 3,
        "search_agent_behavior": "",
        "ai_provider": "",
        "ai_model": "",
        "ai_model_websearch": "",
        "rate_limit_max_requests": null,
        "rate_limit_time_window_seconds": null
    });
    let (status, _) = app
        .put_with_session("/api/v1/settings", &update, &session)
        .await;
    assert_eq!(
        status,
        StatusCode::UNPROCESSABLE_ENTITY,
        "max_items_per_category=51 should return 422"
    );
}

// ── Per-user isolation ───────────────────────────────────────────────────

#[tokio::test]
async fn settings_are_per_user_isolated() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;

    // Create two users with sessions
    let (_user_a_id, session_a) = app
        .create_authenticated_user("user-a-settings@example.com")
        .await;
    let (_user_b_id, session_b) = app
        .create_authenticated_user("user-b-settings@example.com")
        .await;

    // User A updates their settings
    let update_a = serde_json::json!({
        "theme": "User A Theme",
        "max_age_days": 3,
        "categories": ["A-Category"],
        "max_items_per_category": 2,
        "max_articles_per_source": 3,
        "use_llm_for_source_links": false,
        "use_brave_search": false,
        "article_history_days": 90,
        "batch_size": 5,
        "summary_length": 3,
        "source_extraction_window": 3,
        "search_agent_behavior": "User A behavior",
        "ai_provider": "",
        "ai_model": "",
        "ai_model_websearch": "",
        "rate_limit_max_requests": null,
        "rate_limit_time_window_seconds": null
    });
    let (status_a, _) = app
        .put_with_session("/api/v1/settings", &update_a, &session_a)
        .await;
    assert_eq!(status_a, StatusCode::OK);

    // User B updates their settings differently
    let update_b = serde_json::json!({
        "theme": "User B Theme",
        "max_age_days": 14,
        "categories": ["B-Category-1", "B-Category-2"],
        "max_items_per_category": 8,
        "max_articles_per_source": 3,
        "use_llm_for_source_links": false,
        "use_brave_search": false,
        "article_history_days": 90,
        "batch_size": 5,
        "summary_length": 3,
        "source_extraction_window": 3,
        "search_agent_behavior": "User B behavior",
        "ai_provider": "",
        "ai_model": "",
        "ai_model_websearch": "",
        "rate_limit_max_requests": null,
        "rate_limit_time_window_seconds": null
    });
    let (status_b, _) = app
        .put_with_session("/api/v1/settings", &update_b, &session_b)
        .await;
    assert_eq!(status_b, StatusCode::OK);

    // Verify User A sees only their settings
    let (_, body_a) = app.get_with_session("/api/v1/settings", &session_a).await;
    assert_eq!(body_a["theme"], "User A Theme");
    assert_eq!(body_a["max_age_days"], 3);
    let cats_a = body_a["categories"].as_array().unwrap();
    assert_eq!(cats_a.len(), 1);
    assert_eq!(cats_a[0], "A-Category");

    // Verify User B sees only their settings
    let (_, body_b) = app.get_with_session("/api/v1/settings", &session_b).await;
    assert_eq!(body_b["theme"], "User B Theme");
    assert_eq!(body_b["max_age_days"], 14);
    let cats_b = body_b["categories"].as_array().unwrap();
    assert_eq!(cats_b.len(), 2);
    assert_eq!(cats_b[0], "B-Category-1");
}

// ── Boundary values ─────────────────────────────────────────────────────

#[tokio::test]
async fn put_settings_boundary_values_succeed() {
    if !require_test_db() {
        eprintln!("SKIPPED: TEST_DATABASE_URL not set");
        return;
    }

    let app = common::TestApp::new().await;
    let (_user_id, session) = app
        .create_authenticated_user("settings-boundary@example.com")
        .await;

    // Minimum valid values
    let update_min = serde_json::json!({
        "theme": "A",
        "max_age_days": 1,
        "categories": ["C"],
        "max_items_per_category": 1,
        "max_articles_per_source": 3,
        "use_llm_for_source_links": false,
        "use_brave_search": false,
        "article_history_days": 90,
        "batch_size": 5,
        "summary_length": 1,
        "source_extraction_window": 1,
        "search_agent_behavior": "",
        "ai_provider": "",
        "ai_model": "",
        "ai_model_websearch": "",
        "rate_limit_max_requests": null,
        "rate_limit_time_window_seconds": null
    });
    let (status, _) = app
        .put_with_session("/api/v1/settings", &update_min, &session)
        .await;
    assert_eq!(status, StatusCode::OK, "Minimum boundary values should be accepted");

    // Maximum valid values
    let categories_max: Vec<String> = (0..20).map(|i| format!("Cat {}", i)).collect();
    let update_max = serde_json::json!({
        "theme": "a".repeat(200),
        "max_age_days": 365,
        "categories": categories_max,
        "max_items_per_category": 50,
        "max_articles_per_source": 3,
        "use_llm_for_source_links": false,
        "use_brave_search": false,
        "article_history_days": 90,
        "batch_size": 5,
        "summary_length": 3,
        "source_extraction_window": 10,
        "search_agent_behavior": "a".repeat(2000),
        "ai_provider": "",
        "ai_model": "",
        "ai_model_websearch": "",
        "rate_limit_max_requests": null,
        "rate_limit_time_window_seconds": null
    });
    let (status2, _) = app
        .put_with_session("/api/v1/settings", &update_max, &session)
        .await;
    assert_eq!(status2, StatusCode::OK, "Maximum boundary values should be accepted");
}