use axum::{
    body::Body,
    http::{Method, Request, StatusCode, header},
};
use http_body_util::BodyExt;
use serde_json::{Value, json};
use tempfile::TempDir;
use tower::ServiceExt;

async fn test_app() -> (axum::Router, TempDir) {
    let temp_dir = TempDir::new().expect("temporary directory should be created");
    let pool = task_pilot_backend::database::connect("sqlite::memory:")
        .await
        .expect("test database should initialize");
    let app = task_pilot_backend::app(pool, temp_dir.path().join("logs"))
        .await
        .expect("test app should start");
    (app, temp_dir)
}

async fn auth_token(app: &axum::Router) -> String {
    let response = app
        .clone()
        .oneshot(
            Request::builder()
                .uri("/api/v1/session")
                .body(Body::empty())
                .expect("request should build"),
        )
        .await
        .expect("router should respond");
    let body = response
        .into_body()
        .collect()
        .await
        .expect("body should be readable")
        .to_bytes();
    let json: Value = serde_json::from_slice(&body).expect("session should be JSON");
    json["token"]
        .as_str()
        .expect("token should be a string")
        .to_owned()
}

async fn send_json(
    app: &axum::Router,
    method: Method,
    uri: &str,
    token: Option<&str>,
    body: Option<Value>,
) -> (StatusCode, Value) {
    let mut builder = Request::builder().method(method).uri(uri);
    if let Some(token) = token {
        builder = builder.header("x-taskpilot-token", token);
    }
    let request = if let Some(body) = body {
        builder
            .header(header::CONTENT_TYPE, "application/json")
            .body(Body::from(
                serde_json::to_vec(&body).expect("body should serialize"),
            ))
            .expect("request should build")
    } else {
        builder.body(Body::empty()).expect("request should build")
    };

    let response = app
        .clone()
        .oneshot(request)
        .await
        .expect("router should respond");
    let status = response.status();
    let body = response
        .into_body()
        .collect()
        .await
        .expect("body should be readable")
        .to_bytes();
    let json = serde_json::from_slice(&body).unwrap_or(Value::Null);
    (status, json)
}

#[tokio::test]
async fn seeds_python_mirrors_with_one_default() {
    let (app, _temp_dir) = test_app().await;

    let (status, body) = send_json(&app, Method::GET, "/api/v1/python/mirrors", None, None).await;

    assert_eq!(status, StatusCode::OK);
    let mirrors = body.as_array().expect("mirrors should be an array");
    assert_eq!(mirrors.len(), 4);
    let defaults: Vec<&Value> = mirrors
        .iter()
        .filter(|mirror| mirror["is_default"] == true)
        .collect();
    assert_eq!(defaults.len(), 1);
    assert_eq!(defaults[0]["id"], "tsinghua");
    assert!(mirrors.iter().all(|mirror| mirror["enabled"] == true));
}

#[tokio::test]
async fn mirrors_crud_and_default_switch() {
    let (app, _temp_dir) = test_app().await;
    let token = auth_token(&app).await;

    let (status, created) = send_json(
        &app,
        Method::POST,
        "/api/v1/python/mirrors",
        Some(&token),
        Some(json!({
            "name": "内网镜像",
            "index_url": "https://pypi.example.local/simple",
            "trusted_host": "pypi.example.local",
            "enabled": true
        })),
    )
    .await;
    assert_eq!(status, StatusCode::CREATED);
    let id = created["id"]
        .as_str()
        .expect("created mirror should have an id")
        .to_owned();
    assert_eq!(created["is_default"], false);
    assert_eq!(created["trusted_host"], "pypi.example.local");

    let (status, mirror) = send_json(
        &app,
        Method::POST,
        &format!("/api/v1/python/mirrors/{id}/default"),
        Some(&token),
        None,
    )
    .await;
    assert_eq!(status, StatusCode::OK);
    assert_eq!(mirror["is_default"], true);

    let (status, list) = send_json(&app, Method::GET, "/api/v1/python/mirrors", None, None).await;
    assert_eq!(status, StatusCode::OK);
    let defaults = list
        .as_array()
        .expect("mirrors should be an array")
        .iter()
        .filter(|mirror| mirror["is_default"] == true)
        .count();
    assert_eq!(defaults, 1);

    let (status, updated) = send_json(
        &app,
        Method::PUT,
        &format!("/api/v1/python/mirrors/{id}"),
        Some(&token),
        Some(json!({
            "name": "内网镜像（停用）",
            "index_url": "https://pypi.example.local/simple",
            "trusted_host": null,
            "enabled": false
        })),
    )
    .await;
    assert_eq!(status, StatusCode::OK);
    assert_eq!(updated["name"], "内网镜像（停用）");
    assert_eq!(updated["enabled"], false);
    // 停用默认镜像时连带清掉默认标记，避免执行器继续引用一个停用的源
    assert_eq!(updated["is_default"], false);

    let (status, _) = send_json(
        &app,
        Method::DELETE,
        &format!("/api/v1/python/mirrors/{id}"),
        Some(&token),
        None,
    )
    .await;
    assert_eq!(status, StatusCode::NO_CONTENT);

    let (status, body) = send_json(
        &app,
        Method::GET,
        &format!("/api/v1/python/mirrors/{id}"),
        None,
        None,
    )
    .await;
    assert_eq!(status, StatusCode::NOT_FOUND);
    assert_eq!(body["code"], "MIRROR_NOT_FOUND");
}

#[tokio::test]
async fn rejects_invalid_mirror_url_and_duplicate_index() {
    let (app, _temp_dir) = test_app().await;
    let token = auth_token(&app).await;

    let (status, body) = send_json(
        &app,
        Method::POST,
        "/api/v1/python/mirrors",
        Some(&token),
        Some(json!({
            "name": "坏地址",
            "index_url": "ftp://example.com/simple",
            "enabled": true
        })),
    )
    .await;
    assert_eq!(status, StatusCode::BAD_REQUEST);
    assert_eq!(body["field"], "index_url");

    let (status, body) = send_json(
        &app,
        Method::POST,
        "/api/v1/python/mirrors",
        Some(&token),
        Some(json!({
            "name": "重复镜像",
            "index_url": "https://pypi.org/simple",
            "enabled": true
        })),
    )
    .await;
    assert_eq!(status, StatusCode::CONFLICT);
    assert_eq!(body["code"], "MIRROR_CONFLICT");
}

#[tokio::test]
async fn mirror_mutations_require_token() {
    let (app, _temp_dir) = test_app().await;

    let (status, body) = send_json(
        &app,
        Method::POST,
        "/api/v1/python/mirrors",
        None,
        Some(json!({
            "name": "未授权",
            "index_url": "https://example.com/simple",
            "enabled": true
        })),
    )
    .await;
    assert_eq!(status, StatusCode::FORBIDDEN);
    assert_eq!(body["code"], "FORBIDDEN");
}