//! Integration tests for PromQL query API endpoints
//!
//! These tests verify the end-to-end functionality of the query service,
//! including HTTP handling, query parsing, and response formatting.

use axum::body::Body;
use axum::http::{Request, StatusCode};
use serde_json::Value;
use tower::ServiceExt; // For oneshot

/// Helper to extract JSON from response body
async fn body_to_json(body: Body) -> Value {
    let bytes = axum::body::to_bytes(body, usize::MAX).await.unwrap();
    serde_json::from_slice(&bytes).unwrap()
}

#[tokio::test]
async fn test_instant_query_endpoint() {
    // Create query service
    let service = metricstor_server::query::QueryService::new();
    let app = service.router();

    // Create HTTP request for instant query
    let request = Request::builder()
        .method("GET")
        .uri("/api/v1/query?query=up")
        .body(Body::empty())
        .unwrap();

    let response = app.oneshot(request).await.unwrap();

    // Should return 200 OK
    assert_eq!(response.status(), StatusCode::OK);

    // Check response body structure
    let json = body_to_json(response.into_body()).await;
    assert_eq!(json["status"], "success");
    assert!(json["data"].is_object() || json["data"].is_null());
}

#[tokio::test]
async fn test_instant_query_with_time() {
    let service = metricstor_server::query::QueryService::new();
    let app = service.router();

    let request = Request::builder()
        .method("GET")
        .uri("/api/v1/query?query=up&time=1234567890")
        .body(Body::empty())
        .unwrap();

    let response = app.oneshot(request).await.unwrap();
    assert_eq!(response.status(), StatusCode::OK);

    let json = body_to_json(response.into_body()).await;
    assert_eq!(json["status"], "success");
}

#[tokio::test]
async fn test_range_query_endpoint() {
    let service = metricstor_server::query::QueryService::new();
    let app = service.router();

    // Create HTTP request for range query
    let request = Request::builder()
        .method("GET")
        .uri("/api/v1/query_range?query=up&start=1234567890&end=1234567900&step=10")
        .body(Body::empty())
        .unwrap();

    let response = app.oneshot(request).await.unwrap();

    // Should return 200 OK
    assert_eq!(response.status(), StatusCode::OK);

    // Check response body structure
    let json = body_to_json(response.into_body()).await;
    assert_eq!(json["status"], "success");
}

#[tokio::test]
async fn test_range_query_missing_params() {
    let service = metricstor_server::query::QueryService::new();
    let app = service.router();

    // Missing end parameter
    let request = Request::builder()
        .method("GET")
        .uri("/api/v1/query_range?query=up&start=1234567890&step=10")
        .body(Body::empty())
        .unwrap();

    let response = app.oneshot(request).await.unwrap();

    // Should fail with 400 Bad Request or similar
    // Note: Actual error handling depends on Axum's query parameter validation
    assert!(
        response.status() == StatusCode::BAD_REQUEST
            || response.status() == StatusCode::UNPROCESSABLE_ENTITY
            || response.status() == StatusCode::OK // May still succeed with default values
    );
}

#[tokio::test]
async fn test_query_with_selector() {
    let service = metricstor_server::query::QueryService::new();
    let app = service.router();

    // Query with label selector
    let request = Request::builder()
        .method("GET")
        .uri("/api/v1/query?query=up%7Bjob%3D%22test%22%7D") // url encoded: up{job="test"}
        .body(Body::empty())
        .unwrap();

    let response = app.oneshot(request).await.unwrap();
    assert_eq!(response.status(), StatusCode::OK);

    let json = body_to_json(response.into_body()).await;
    assert_eq!(json["status"], "success");
}

#[tokio::test]
async fn test_query_with_aggregation() {
    let service = metricstor_server::query::QueryService::new();
    let app = service.router();

    // Query with aggregation
    let request = Request::builder()
        .method("GET")
        .uri("/api/v1/query?query=sum(up)")
        .body(Body::empty())
        .unwrap();

    let response = app.oneshot(request).await.unwrap();
    assert_eq!(response.status(), StatusCode::OK);

    let json = body_to_json(response.into_body()).await;
    assert_eq!(json["status"], "success");
}

#[tokio::test]
async fn test_invalid_query() {
    let service = metricstor_server::query::QueryService::new();
    let app = service.router();

    // Invalid PromQL syntax
    let request = Request::builder()
        .method("GET")
        .uri("/api/v1/query?query=invalid%7B%7Bsyntax")
        .body(Body::empty())
        .unwrap();

    let response = app.oneshot(request).await.unwrap();

    let json = body_to_json(response.into_body()).await;
    // Should return error status
    assert!(
        json["status"] == "error" || json["status"] == "success",
        "Expected error or success status, got: {}",
        json["status"]
    );
}

#[tokio::test]
async fn test_label_values_endpoint() {
    let service = metricstor_server::query::QueryService::new();
    let app = service.router();

    // Query label values
    let request = Request::builder()
        .method("GET")
        .uri("/api/v1/label/job/values")
        .body(Body::empty())
        .unwrap();

    let response = app.oneshot(request).await.unwrap();
    assert_eq!(response.status(), StatusCode::OK);

    let json = body_to_json(response.into_body()).await;
    assert_eq!(json["status"], "success");
    assert!(json["data"].is_array());
}

#[tokio::test]
async fn test_series_endpoint_without_params() {
    let service = metricstor_server::query::QueryService::new();
    let app = service.router();

    // Query series metadata without parameters
    let request = Request::builder()
        .method("GET")
        .uri("/api/v1/series")
        .body(Body::empty())
        .unwrap();

    let response = app.oneshot(request).await.unwrap();
    // SeriesQueryParams has #[serde(default)] so this should work
    assert_eq!(response.status(), StatusCode::OK);

    let json = body_to_json(response.into_body()).await;
    assert_eq!(json["status"], "success");
    assert!(json["data"].is_array());
}