// file: crates/ksp-onchain-transport-lib/unit_tests/rpc_canary.rs
// version: 2

fn pool_for_url(url: &str) -> crate::HttpTransportPool {
    let role = crate::HttpEndpointRoleSettings::new(
        crate::HttpRoleName::new("default"),
        true,
        std::vec![crate::HttpRequestKind::wildcard()],
        10,
        crate::HttpRoleLimits::new(std::option::Option::None, std::option::Option::None, std::option::Option::None, std::option::Option::None),
    );
    let endpoint = crate::HttpEndpointSettings::new(
        "fixture",
        true,
        crate::HttpProviderName::new("fixture"),
        crate::HttpClusterName::new("local"),
        crate::HttpEndpointUrl::parse(url).expect("fixture URL must parse"),
        std::time::Duration::from_secs(1),
        std::time::Duration::from_secs(1),
        std::option::Option::Some(1),
        std::vec![role],
    );
    let settings = crate::HttpTransportSettings::new(
        std::vec![endpoint],
        crate::HttpRetrySettings::new(0, std::time::Duration::from_millis(1), std::time::Duration::from_millis(1)),
    );
    return crate::HttpTransportPool::new(settings).expect("fixture pool must build");
}

fn serve_once(body: &'static str) -> (std::string::String, std::thread::JoinHandle<std::string::String>) {
    let listener = std::net::TcpListener::bind("127.0.0.1:0").expect("fixture listener must bind");
    let address = listener.local_addr().expect("fixture listener address must resolve");
    let handle = std::thread::spawn(move || {
        let (mut stream, _) = listener.accept().expect("fixture server must accept one request");
        let request = read_request(&mut stream);
        let response = format!("HTTP/1.1 200 OK\r\nContent-Type: application/json\r\nContent-Length: {}\r\nConnection: close\r\n\r\n{}", body.len(), body);
        std::io::Write::write_all(&mut stream, response.as_bytes()).expect("fixture response must write");
        return request;
    });
    return (format!("http://{address}"), handle);
}

fn read_request(stream: &mut std::net::TcpStream) -> std::string::String {
    let mut bytes = std::vec::Vec::new();
    let mut buffer = [0_u8; 1024];
    loop {
        let count = std::io::Read::read(stream, &mut buffer).expect("fixture request must read");
        if count == 0 {
            break;
        }
        bytes.extend_from_slice(&buffer[..count]);
        if request_complete(bytes.as_slice()) {
            break;
        }
    }
    return std::string::String::from_utf8(bytes).expect("fixture request must be UTF-8");
}

fn request_complete(bytes: &[u8]) -> bool {
    let text = match std::str::from_utf8(bytes) {
        std::result::Result::Ok(text) => text,
        std::result::Result::Err(_) => return false,
    };
    let header_end = match text.find("\r\n\r\n") {
        std::option::Option::Some(value) => value,
        std::option::Option::None => return false,
    };
    let mut content_length = 0_usize;
    for line in text[..header_end].lines() {
        let (name, value) = match line.split_once(':') {
            std::option::Option::Some(parts) => parts,
            std::option::Option::None => continue,
        };
        if name.eq_ignore_ascii_case("content-length") {
            content_length = value.trim().parse::<usize>().expect("content length must parse");
        }
    }
    return bytes.len() >= header_end.saturating_add(4).saturating_add(content_length);
}

fn request_body(request: &str) -> serde_json::Value {
    let body = request.split("\r\n\r\n").nth(1).expect("fixture request body must exist");
    return serde_json::from_str(body).expect("fixture request body must be JSON");
}

#[tokio::test(flavor = "current_thread")]
async fn typed_get_health_executes_real_http_fixture() {
    let (url, handle) = serve_once(include_str!("../fixtures/http/get_health.success.json"));
    let pool = pool_for_url(url.as_str());
    let result = pool.get_health(&crate::HttpRoleName::new("default")).await.expect("getHealth fixture must succeed");
    assert_eq!(result, crate::SolanaNodeHealth::Healthy);
    let request = handle.join().expect("fixture server must join");
    let body = request_body(request.as_str());
    assert_eq!(body["method"], serde_json::json!("getHealth"));
}

#[tokio::test(flavor = "current_thread")]
async fn typed_get_genesis_hash_executes_real_http_fixture() {
    let (url, handle) = serve_once(include_str!("../fixtures/http/get_genesis_hash.success.json"));
    let pool = pool_for_url(url.as_str());
    let result = pool.get_genesis_hash(&crate::HttpRoleName::new("default")).await.expect("getGenesisHash fixture must succeed");
    assert_eq!(result.as_str(), "GH7ome3EiwEr7tu9JuTh2dpYWBJK3z69Xm1ZE3MEE6JC");
    let request = handle.join().expect("fixture server must join");
    assert_eq!(request_body(request.as_str())["method"], serde_json::json!("getGenesisHash"));
}

#[tokio::test(flavor = "current_thread")]
async fn typed_get_version_executes_real_http_fixture() {
    let (url, handle) = serve_once(include_str!("../fixtures/http/get_version.success.json"));
    let pool = pool_for_url(url.as_str());
    let result = pool.get_version(&crate::HttpRoleName::new("default")).await.expect("getVersion fixture must succeed");
    assert_eq!(result.solana_core(), "3.1.8");
    assert_eq!(result.feature_set(), std::option::Option::Some(2_891_131_721));
    let request = handle.join().expect("fixture server must join");
    assert_eq!(request_body(request.as_str())["method"], serde_json::json!("getVersion"));
}

#[tokio::test(flavor = "current_thread")]
async fn typed_get_balance_executes_real_http_fixture_and_encodes_config() {
    let (url, handle) = serve_once(include_str!("../fixtures/http/get_balance.success.json"));
    let pool = pool_for_url(url.as_str());
    let account = "11111111111111111111111111111111".parse::<ksp_core_lib::Pubkey>().expect("system address must parse");
    let config = crate::GetBalanceConfig::new(std::option::Option::Some(crate::SolanaCommitment::Finalized), std::option::Option::Some(123));
    let result = pool
        .get_balance(&crate::HttpRoleName::new("default"), &account, std::option::Option::Some(&config))
        .await
        .expect("getBalance fixture must succeed");
    assert_eq!(result.value(), 424_242);
    assert_eq!(result.context().slot(), 123_456_789);
    assert_eq!(result.context().api_version(), std::option::Option::Some("3.1.8"));
    let request = handle.join().expect("fixture server must join");
    let body = request_body(request.as_str());
    assert_eq!(body["method"], serde_json::json!("getBalance"));
    assert_eq!(body["params"][0], serde_json::json!("11111111111111111111111111111111"));
    assert_eq!(body["params"][1]["commitment"], serde_json::json!("finalized"));
    assert_eq!(body["params"][1]["minContextSlot"], serde_json::json!(123));
}