steam-user 0.1.0

//! Steam Community client.
//!
//! The main client for interacting with Steam Community web endpoints.

use std::{sync::Arc, time::Duration};

use base64::Engine;
use parking_lot::Mutex;
use prost::Message;
use reqwest::{Response, StatusCode};
use reqwest_middleware::{ClientBuilder, ClientWithMiddleware};
use reqwest_retry::{policies::ExponentialBackoff, RetryTransientMiddleware};

use crate::retry::KindAwareRetryStrategy;
use steam_enums::etokenrenewaltype::ETokenRenewalType;
use steam_protos::messages::auth::{CAuthenticationAccessTokenGenerateForAppRequest, CAuthenticationAccessTokenGenerateForAppResponse, CAuthenticationGetAuthSessionInfoRequest, CAuthenticationGetAuthSessionInfoResponse};
use steamid::SteamID;

use crate::{error::SteamUserError, session::Session, utils::qr::decode_login_qr_url};

/// Default User-Agent (Chrome-like).
const DEFAULT_USER_AGENT: &str = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36";

const DEFAULT_TIMEOUT: Duration = Duration::from_secs(300);
const DEFAULT_CONNECT_TIMEOUT: Duration = Duration::from_secs(30);

/// Timeout for fetches to non-Steam hosts (image CDNs, user-supplied URLs).
/// Shorter than `DEFAULT_TIMEOUT` because we don't owe arbitrary external
/// hosts the same patience we owe Steam.
const EXTERNAL_TIMEOUT: Duration = Duration::from_secs(60);

/// Inner wrapper to prevent accidental bypass of request builder overrides
#[derive(Debug, Clone)]
pub(crate) struct InnerHttpClient(ClientWithMiddleware);

/// Steam Community web client.
///
/// Provides HTTP-based interactions with Steam Community endpoints.
///
/// `SteamUser` implements `Clone`. All clones share the same cookie jar
/// (`Arc<Jar>`) and rate-limiter (`Arc<SteamRateLimiter>`), so they stay in
/// sync for cookies and rate limits. The `time_offset` is copied by value at
/// clone time.
#[derive(Debug)]
pub struct SteamUser {
    /// HTTP client with cookie support.
    pub(crate) client: InnerHttpClient,
    /// HTTP client for non-Steam hosts. Has no cookie jar, no Steam
    /// rate-limiter, and a shorter timeout. Use via `external_get` /
    /// `external_post` for arbitrary external URLs (e.g. user-supplied
    /// image URLs); never use it for Steam endpoints.
    pub(crate) external_client: reqwest::Client,
    /// HTTP client for Steam endpoints with redirect-following disabled,
    /// used by `get_with_manual_redirects`. Shares the same cookie jar
    /// as `client` so cookies stay in sync across redirect hops. Built
    /// once in the constructor instead of per-call.
    pub(crate) no_redirect_client: reqwest::Client,
    /// Session state (cookies, steam_id, etc.).
    pub session: Session,
    /// Time offset from Steam servers (for TOTP), behind Mutex for interior
    /// mutability.
    pub(crate) time_offset: Mutex<Option<i64>>,
    /// Optional per-session rate limiter.
    pub(crate) session_limiter: Option<Arc<crate::limiter::SteamRateLimiter>>,
}

impl Clone for SteamUser {
    fn clone(&self) -> Self {
        Self {
            client: self.client.clone(),
            external_client: self.external_client.clone(),
            no_redirect_client: self.no_redirect_client.clone(),
            session: self.session.clone(),
            time_offset: Mutex::new(*self.time_offset.lock()),
            session_limiter: self.session_limiter.clone(),
        }
    }
}

/// Builder for [`SteamUser`].
///
/// Obtained via [`SteamUser::builder`]. Required field: cookies. All other
/// fields fall back to the same defaults that [`SteamUser::new`] uses.
#[derive(Debug, Default)]
pub struct SteamUserBuilder {
    cookies: Vec<String>,
    rate_limit: Option<(u32, u32)>,
    timeout: Option<Duration>,
    connect_timeout: Option<Duration>,
    external_timeout: Option<Duration>,
    user_agent: Option<String>,
    retry_count: Option<u32>,
}

impl SteamUserBuilder {
    /// Set the session cookies. Replaces any previously-set cookies.
    pub fn cookies<S: AsRef<str>>(mut self, cookies: &[S]) -> Self {
        self.cookies = cookies.iter().map(|s| s.as_ref().to_string()).collect();
        self
    }

    /// Set a per-session rate limit (requests-per-minute, burst).
    /// Applied in addition to the global IP-wide limit.
    pub fn rate_limit(mut self, requests_per_minute: u32, burst: u32) -> Self {
        self.rate_limit = Some((requests_per_minute, burst));
        self
    }

    /// Override the per-request timeout (default: 300s).
    pub fn timeout(mut self, timeout: Duration) -> Self {
        self.timeout = Some(timeout);
        self
    }

    /// Override the TCP connect timeout (default: 30s).
    pub fn connect_timeout(mut self, connect_timeout: Duration) -> Self {
        self.connect_timeout = Some(connect_timeout);
        self
    }

    /// Override the timeout for the external (non-Steam) client (default: 60s).
    pub fn external_timeout(mut self, external_timeout: Duration) -> Self {
        self.external_timeout = Some(external_timeout);
        self
    }

    /// Override the User-Agent header.
    pub fn user_agent(mut self, user_agent: impl Into<String>) -> Self {
        self.user_agent = Some(user_agent.into());
        self
    }

    /// Override the retry count (default: 3 retries = 4 total attempts).
    pub fn retry_count(mut self, retry_count: u32) -> Self {
        self.retry_count = Some(retry_count);
        self
    }

    /// Build the `SteamUser`. Validates inputs and constructs all three
    /// HTTP clients (Steam, no-redirect Steam, external).
    pub fn build(self) -> Result<SteamUser, SteamUserError> {
        let timeout = self.timeout.unwrap_or(DEFAULT_TIMEOUT);
        let connect_timeout = self.connect_timeout.unwrap_or(DEFAULT_CONNECT_TIMEOUT);
        let external_timeout = self.external_timeout.unwrap_or(EXTERNAL_TIMEOUT);
        let user_agent = self.user_agent.as_deref().unwrap_or(DEFAULT_USER_AGENT);
        let retry_count = self.retry_count.unwrap_or(3);

        let mut session = Session::new();
        let cookie_refs: Vec<&str> = self.cookies.iter().map(|s| s.as_str()).collect();
        session.set_cookies(&cookie_refs)?;
        session.ensure_session_id();

        let reqwest_client = reqwest::Client::builder().cookie_provider(Arc::clone(&session.jar)).connect_timeout(connect_timeout).timeout(timeout).user_agent(user_agent).gzip(true).min_tls_version(reqwest::tls::Version::TLS_1_2).https_only(true).build().map_err(|e| SteamUserError::ClientBuild(e.to_string()))?;

        let retry_policy = ExponentialBackoff::builder().build_with_max_retries(retry_count);
        let client = ClientBuilder::new(reqwest_client).with(reqwest_tracing::TracingMiddleware::default()).with(RetryTransientMiddleware::new_with_policy_and_strategy(retry_policy, KindAwareRetryStrategy)).build();

        let external_client = reqwest::Client::builder().connect_timeout(connect_timeout).timeout(external_timeout).user_agent(user_agent).gzip(true).min_tls_version(reqwest::tls::Version::TLS_1_2).https_only(true).build().map_err(|e| SteamUserError::ClientBuild(e.to_string()))?;

        let no_redirect_client = reqwest::Client::builder().cookie_provider(Arc::clone(&session.jar)).connect_timeout(connect_timeout).timeout(timeout).user_agent(user_agent).gzip(true).min_tls_version(reqwest::tls::Version::TLS_1_2).https_only(true).redirect(reqwest::redirect::Policy::none()).build().map_err(|e| SteamUserError::ClientBuild(e.to_string()))?;

        let session_limiter = match self.rate_limit {
            Some((rpm, burst)) => {
                use std::num::NonZeroU32;

                use governor::{Quota, RateLimiter};
                let rpm = NonZeroU32::new(rpm).ok_or_else(|| SteamUserError::InvalidInput("`requests_per_minute` must be non-zero".into()))?;
                let burst = NonZeroU32::new(burst).ok_or_else(|| SteamUserError::InvalidInput("`burst` must be non-zero".into()))?;
                Some(Arc::new(RateLimiter::direct(Quota::per_minute(rpm).allow_burst(burst))))
            }
            None => None,
        };

        Ok(SteamUser { client: InnerHttpClient(client), external_client, no_redirect_client, session, time_offset: Mutex::new(None), session_limiter })
    }
}

impl SteamUser {
    /// Creates a new `SteamUser` client with the provided cookies.
    ///
    /// Convenience wrapper over [`SteamUser::builder`] with default
    /// timeouts and user-agent. Use the builder when you need to tweak
    /// any of those.
    ///
    /// # Arguments
    ///
    /// * `cookies` - A slice of cookie strings in "name=value" format.
    ///
    /// # Errors
    ///
    /// Returns a `SteamUserError` if the cookies are invalid or could not be
    /// parsed.
    #[tracing::instrument(skip(cookies))]
    pub fn new(cookies: &[&str]) -> Result<Self, SteamUserError> {
        Self::builder().cookies(cookies).build()
    }

    /// Returns a builder for configuring a new `SteamUser`.
    ///
    /// Use the builder to override defaults (timeouts, user-agent, retry
    /// count) or to set a per-session rate limit at construction time
    /// instead of via [`Self::with_rate_limit`].
    pub fn builder() -> SteamUserBuilder {
        SteamUserBuilder::default()
    }

    /// Sets a per-session rate limit for this `SteamUser`.
    ///
    /// This limit is applied *in addition* to the global IP-wide limit.
    ///
    /// # Errors
    ///
    /// Returns an error if `requests_per_minute` or `burst` is zero.
    pub fn with_rate_limit(mut self, requests_per_minute: u32, burst: u32) -> Result<Self, crate::SteamUserError> {
        use std::num::NonZeroU32;

        use governor::{Quota, RateLimiter};

        let rpm = NonZeroU32::new(requests_per_minute).ok_or_else(|| crate::SteamUserError::InvalidInput("`requests_per_minute` must be non-zero".into()))?;
        let burst = NonZeroU32::new(burst).ok_or_else(|| crate::SteamUserError::InvalidInput("`burst` must be non-zero".into()))?;

        self.session_limiter = Some(Arc::new(RateLimiter::direct(Quota::per_minute(rpm).allow_burst(burst))));
        Ok(self)
    }

    /// Returns the current `SteamID` if the user is logged in.
    pub fn steam_id(&self) -> Option<SteamID> {
        self.session.steam_id
    }

    /// Creates a GET request with default query parameters (e.g., language set
    /// to English).
    ///
    /// # Arguments
    ///
    /// * `url` - The target URL for the GET request.
    pub fn get(&self, url: impl reqwest::IntoUrl) -> SteamRequestBuilder {
        // GET requests don't typically need sessionid in body/form, only query.
        // The base request method already adds it to query.
        self.request(reqwest::Method::GET, url)
    }

    /// Creates a POST request to the specified URL.
    ///
    /// This method returns a `SteamRequestBuilder` which automatically appends
    /// the session ID to form or multipart data if it's available.
    pub fn post(&self, url: impl reqwest::IntoUrl) -> SteamRequestBuilder {
        self.request(reqwest::Method::POST, url)
    }

    /// Creates a GET request using a relative path resolved against the
    /// current `#[steam_endpoint]`'s host.
    ///
    /// # Panics
    ///
    /// Panics if called outside a `#[steam_endpoint]`-annotated method.
    pub fn get_path(&self, path: impl std::fmt::Display) -> SteamRequestBuilder {
        self.request_path(reqwest::Method::GET, path)
    }

    /// Creates a POST request using a relative path resolved against the
    /// current `#[steam_endpoint]`'s host.
    ///
    /// # Panics
    ///
    /// Panics if called outside a `#[steam_endpoint]`-annotated method.
    pub fn post_path(&self, path: impl std::fmt::Display) -> SteamRequestBuilder {
        self.request_path(reqwest::Method::POST, path)
    }

    fn request_path(&self, method: reqwest::Method, path: impl std::fmt::Display) -> SteamRequestBuilder {
        let base = crate::endpoint::current_endpoint()
            .expect("*_path() called outside a #[steam_endpoint] method")
            .host
            .base_url();
        self.request(method, format!("{base}{path}"))
    }

    /// Creates a GET request against an explicit Steam host, regardless of
    /// the current `#[steam_endpoint]` (if any).
    ///
    /// Use when a Steam endpoint is reached on a host other than the one
    /// declared by the enclosing method's `#[steam_endpoint]` attribute —
    /// for example, a Help-host URL composed at runtime from inside a
    /// Community-host method.
    ///
    /// Cookies, `sessionid` injection, and the per-host rate limiter are
    /// applied exactly as in `get_path`.
    pub fn get_path_on(&self, host: crate::endpoint::Host, path: impl std::fmt::Display) -> SteamRequestBuilder {
        self.request(reqwest::Method::GET, format!("{}{}", host.base_url(), path))
    }

    /// Creates a POST request against an explicit Steam host. See
    /// [`Self::get_path_on`] for the use case.
    pub fn post_path_on(&self, host: crate::endpoint::Host, path: impl std::fmt::Display) -> SteamRequestBuilder {
        self.request(reqwest::Method::POST, format!("{}{}", host.base_url(), path))
    }

    /// Creates a GET request to a non-Steam URL using the external client.
    ///
    /// **Use only for URLs that are NOT on Steam-owned hosts** — for
    /// example, fetching a user-supplied avatar image from an arbitrary
    /// CDN. Steam cookies are not attached, the Steam rate limiter is not
    /// engaged, and middleware (retry, tracing) is bypassed.
    ///
    /// Returns a plain `reqwest::RequestBuilder`, not a `SteamRequestBuilder`,
    /// because session-id injection and Steam-specific behaviour are
    /// inappropriate for external hosts.
    pub fn external_get(&self, url: impl reqwest::IntoUrl) -> reqwest::RequestBuilder {
        self.external_client.get(url)
    }

    /// Creates a POST request to a non-Steam URL using the external
    /// client. See [`Self::external_get`] for the use case.
    pub fn external_post(&self, url: impl reqwest::IntoUrl) -> reqwest::RequestBuilder {
        self.external_client.post(url)
    }

    /// Creates a request with the specified HTTP method and URL, including
    /// common query parameters.
    ///
    /// This is a low-level method used by `get` and `post`. It sets the default
    /// language and includes the session ID in the query parameters if it's
    /// available.
    #[allow(clippy::disallowed_methods)] // This IS the low-level wrapper; must call inner client.
    pub fn request(&self, method: reqwest::Method, url: impl reqwest::IntoUrl) -> SteamRequestBuilder {
        let mut builder = self.client.0.request(method.clone(), url).query(&[("l", "english")]);

        // Manually inject cookies if available
        if !self.session.cookie_string.is_empty() {
            builder = builder.header("Cookie", &self.session.cookie_string);
        }

        SteamRequestBuilder {
            builder,
            session_id: self.session.session_id.clone(),
            session_limiter: self.session_limiter.clone(),
            request_body: None,
            // Tracking-only field for debug logging; populated lazily when
            // `query()` is called. The `?l=english` is already on the
            // underlying `builder`.
            query: None,
            http_method: method,
        }
    }

    /// Steam host allowlist for redirect validation.
    ///
    /// A redirect `Location` whose host is not on this list (or a subdomain
    /// thereof) is rejected to prevent header-stripping / open-redirect abuse.
    fn is_steam_host(host: &str) -> bool {
        const ALLOWED: &[&str] = &[
            "steamcommunity.com",
            "store.steampowered.com",
            "help.steampowered.com",
            "api.steampowered.com",
            "steampowered.com",
            "s.team",
        ];
        for allowed in ALLOWED {
            if host == *allowed || host.ends_with(&format!(".{}", allowed)) {
                return true;
            }
        }
        false
    }

    /// Performs a GET request with manual redirect handling.
    ///
    /// This is needed for pages like trade offers where Steam redirects through
    /// `/market/eligibilitycheck/` which can fail with automatic redirect
    /// following. Uses a temporary no-redirect client and manually follows
    /// the redirect chain.
    pub async fn get_with_manual_redirects(&self, url: &str) -> Result<String, SteamUserError> {
        let no_redirect_client = &self.no_redirect_client;

        let mut current_url = url.to_string();
        let max_redirects = 10;
        let mut seen_urls = std::collections::HashSet::new();

        for i in 0..max_redirects {
            // Only add l=english on the first request; redirect URLs already contain it.
            // Do NOT manually set the Cookie header — the cookie jar (cookie_provider)
            // handles cookies automatically. This is critical: the eligibility
            // check response sets cookies that must be sent on subsequent
            // requests, and a static Cookie header would override the jar and
            // prevent those new cookies from being included.
            let mut request = no_redirect_client.get(&current_url);
            if i == 0 {
                request = request.query(&[("l", "english")]);
            }

            let response = request.send().await?;
            let status = response.status();

            if status.is_redirection() {
                if let Some(location) = response.headers().get(reqwest::header::LOCATION) {
                    let location_str = location.to_str().map_err(|e| SteamUserError::RedirectError(format!("Invalid Location header: {e}")))?;

                    // Resolve relative URLs against the current URL
                    let base = reqwest::Url::parse(&current_url).map_err(|e| SteamUserError::RedirectError(format!("Invalid base URL: {e}")))?;
                    let next_url = base.join(location_str).map_err(|e| SteamUserError::RedirectError(format!("Invalid redirect URL: {e}")))?;

                    // Reject redirects to non-Steam hosts to prevent open-redirect abuse.
                    let next_host = next_url.host_str().unwrap_or("");
                    if !Self::is_steam_host(next_host) {
                        return Err(SteamUserError::RedirectError(format!(
                            "Redirect to non-Steam host rejected: {}",
                            next_host
                        )));
                    }

                    tracing::debug!("[TradeOffers] Following redirect: {} -> {}", current_url, next_url);

                    // Detect redirect loops by checking the URL path (ignore query params)
                    let loop_key = next_url.path().to_string();
                    if !seen_urls.insert(loop_key) {
                        tracing::warn!("[TradeOffers] Redirect loop detected at {}, attempting direct fetch", next_url.path());
                        let direct_response = no_redirect_client.get(next_url.as_str()).send().await?;
                        if direct_response.status().is_success() {
                            return direct_response.text().await.map_err(SteamUserError::HttpError);
                        }
                        return Err(SteamUserError::HttpStatus { status: direct_response.status().as_u16(), url: next_url.to_string() });
                    }

                    current_url = next_url.to_string();
                    continue;
                }
                return Err(SteamUserError::RedirectError("Redirect without Location header".into()));
            }

            if status.is_success() {
                return response.text().await.map_err(SteamUserError::HttpError);
            }

            return Err(SteamUserError::HttpStatus { status: status.as_u16(), url: current_url.clone() });
        }

        Err(SteamUserError::RedirectError("Too many redirects".into()))
    }

    /// Returns the current session ID, generating one from cookies if it's not
    /// already cached.
    pub fn get_session_id(&mut self) -> &str {
        self.session.get_session_id()
    }

    /// Returns `true` if the client session has a Steam ID and session ID,
    /// suggesting the user is logged in.
    ///
    /// Note: This does not verify the session with Steam servers; use
    /// `logged_in()` for a definitive check.
    pub fn is_logged_in(&self) -> bool {
        self.session.is_logged_in()
    }

    /// Sets the mobile access token used for two-factor authentication (2FA)
    /// operations.
    pub fn set_mobile_access_token(&mut self, token: String) {
        self.session.set_mobile_access_token(token);
    }

    /// Sets the refresh token used for token enumeration and renewal.
    pub fn set_refresh_token(&mut self, token: String) {
        self.session.set_refresh_token(token);
    }

    /// Sets the access token.
    pub fn set_access_token(&mut self, token: String) {
        self.session.set_access_token(token);
    }

    /// Returns the cookies formatted as a string for web requests.
    ///
    /// This constructs the cookies using the access token and Steam ID,
    /// similar to the "simple" cookie logic in `steam-auth`.
    pub fn get_web_cookies(&self) -> String {
        let steam_id = self.session.steam_id.map(|id| id.steam_id64().to_string()).unwrap_or_default();
        let access_token = self.session.access_token.as_deref().unwrap_or_default();
        let session_id = self.session.session_id.as_deref().unwrap_or_default();

        let mut cookies = Vec::new();
        cookies.push(format!("steamLoginSecure={}||{}", steam_id, access_token));
        cookies.push(format!("sessionid={}", session_id));

        // Add domain-specific sessionid cookies if needed, but for string
        // representation this is usually sufficient or we'd need to know the
        // target domain. For general use, these two are the core authentication
        // cookies.

        cookies.join("; ")
    }

    /// Verifies the current login status by making a request to Steam.
    ///
    /// Returns a tuple containing:
    /// * `bool` - Whether the user is actually logged in.
    /// * `bool` - Whether the account is currently restricted by Family View.
    #[tracing::instrument(skip(self))]
    #[allow(clippy::disallowed_methods)] // Deliberately bypasses rate limiter for lightweight session check.
    pub async fn logged_in(&self) -> Result<(bool, bool), SteamUserError> {
        // Use the no-redirect client so we see the raw 302 that Steam issues
        // when `/my` resolves. The middleware client auto-follows redirects,
        // making the FOUND branch unreachable with it.
        let mut request = self.no_redirect_client.get("https://steamcommunity.com/my");

        // Manually inject cookies if available
        if !self.session.cookie_string.is_empty() {
            request = request.header("Cookie", &self.session.cookie_string);
        }

        let response = request.send().await?;

        let status = response.status();

        if status == StatusCode::FORBIDDEN {
            // 403 = Family View restricted but logged in
            return Ok((true, true));
        }

        if status == StatusCode::FOUND {
            // Primary login signal: Steam redirects /my to the user's profile
            // on success and to a login URL on failure.
            if let Some(location) = response.headers().get("location") {
                let loc_str = location.to_str().unwrap_or("");
                // Redirected to login page → not logged in
                if loc_str.contains("/login") || loc_str.contains("steampowered.com/login") {
                    return Ok((false, false));
                }
                // Redirected to profile page → logged in
                if loc_str.contains("/id/") || loc_str.contains("/profiles/") {
                    return Ok((true, false));
                }
            }
        }

        // Secondary signal: follow through to the resolved page body (rare fallback).
        if status == StatusCode::OK {
            let body = response.text().await.unwrap_or_default();
            // If we can see profile page content, we're logged in
            if body.contains("g_rgProfileData") || body.contains("actual_persona_name") {
                return Ok((true, false));
            }
        }

        // Any other case means not logged in
        Ok((false, false))
    }

    /// Renews the current access token using the stored refresh token.
    ///
    /// This is typically used when an access token has expired.
    #[tracing::instrument(skip(self))]
    #[allow(clippy::disallowed_methods)] // Uses raw API endpoint, not community page — rate limiter N/A.
    pub async fn renew_access_token(&mut self) -> Result<(), SteamUserError> {
        let refresh_token = self.session.refresh_token.clone().ok_or(SteamUserError::MissingCredential { field: "refresh_token" })?;

        let steam_id = self.session.steam_id.ok_or(SteamUserError::NotLoggedIn)?;

        let request = CAuthenticationAccessTokenGenerateForAppRequest {
            refresh_token: Some(refresh_token.clone()),
            steamid: Some(steam_id.steam_id64()),
            renewal_type: Some(ETokenRenewalType::None as i32),
        };

        let mut body = Vec::new();
        request.encode(&mut body)?;

        // Construct query parameters (access_token moved to Authorization: Bearer)
        let params = [("origin", "https://store.steampowered.com")];

        let mut builder = self.client.0.post("https://api.steampowered.com/IAuthenticationService/GenerateAccessTokenForApp/v1").query(&params).form(&[("input_protobuf_encoded", base64::engine::general_purpose::STANDARD.encode(body))]);

        if let Some(token) = self.session.access_token.as_deref() {
            builder = builder.bearer_auth(token);
        }

        let response = builder.send().await?;

        if !response.status().is_success() {
            let status = response.status();
            let url = response.url().to_string();
            let text = response.text().await.unwrap_or_default();
            tracing::error!("Renew response error: {} - {}", status, text);
            return Err(SteamUserError::HttpStatus { status: status.as_u16(), url });
        }

        let bytes = response.bytes().await?;
        let response_proto = CAuthenticationAccessTokenGenerateForAppResponse::decode(bytes)?;

        // Debug logging
        tracing::debug!("[renew_access_token] Response received:");
        tracing::debug!("  - access_token present: {}", response_proto.access_token.is_some());
        tracing::debug!("  - refresh_token present: {}", response_proto.refresh_token.is_some());
        if let Some(ref token) = response_proto.access_token {
            tracing::info!(token_len = token.len(), "new access_token acquired");
        }

        if let Some(new_access_token) = response_proto.access_token {
            self.session.access_token = Some(new_access_token);
        } else {
            tracing::warn!("No new access token returned by Steam!");
        }

        if let Some(new_refresh_token) = response_proto.refresh_token {
            self.session.refresh_token = Some(new_refresh_token);
        }

        Ok(())
    }

    /// Retrieves authentication session information for a given QR challenge
    /// URL.
    ///
    /// This is used during the QR code login process to get details about the
    /// pending session.
    #[tracing::instrument(skip(self))]
    #[allow(clippy::disallowed_methods)] // Uses raw API endpoint, not community page — rate limiter N/A.
    pub async fn get_auth_session_info(&self, qr_challenge_url: &str) -> Result<CAuthenticationGetAuthSessionInfoResponse, SteamUserError> {
        let (client_id, _version) = decode_login_qr_url(qr_challenge_url).ok_or_else(|| SteamUserError::InvalidInput("Invalid QR challenge URL".into()))?;

        let request = CAuthenticationGetAuthSessionInfoRequest { client_id: Some(client_id) };

        let mut body = Vec::new();
        request.encode(&mut body)?;

        // We need an access token for this request
        let access_token = self.session.access_token.as_deref().ok_or(SteamUserError::MissingCredential { field: "access_token" })?;

        let params = [("access_token", access_token), ("spoof_steamid", ""), ("origin", "https://store.steampowered.com")];

        let response = self.client.0.post("https://api.steampowered.com/IAuthenticationService/GetAuthSessionInfo/v1/").query(&params).multipart(reqwest::multipart::Form::new().part("input_protobuf_encoded", reqwest::multipart::Part::bytes(body))).send().await?;

        self.check_response(&response)?;

        let bytes = response.bytes().await?;
        let response_proto = CAuthenticationGetAuthSessionInfoResponse::decode(bytes)?;

        Ok(response_proto)
    }

    /// Retrieves the Steam Chat client JS token.
    ///
    /// This token is used for authenticating with the Steam Chat WebSocket
    /// connection. It is fetched from `https://steamcommunity.com/chat/clientjstoken`.
    ///
    /// # Returns
    ///
    /// Returns a `ClientJsToken` struct if successful.
    ///
    /// # Errors
    ///
    /// Returns a `SteamUserError` if the request fails or the user is not
    /// logged in.
    #[allow(clippy::disallowed_methods)] // Utility on client itself, not a service endpoint.
    pub async fn get_client_js_token(&self) -> Result<ClientJsToken, SteamUserError> {
        let url = "https://steamcommunity.com/chat/clientjstoken";
        let response = self.get(url).send().await?;
        self.check_response(&response)?;

        let token: ClientJsToken = response.json().await?;

        if !token.logged_in {
            return Err(SteamUserError::NotLoggedIn);
        }

        Ok(token)
    }

    // ========================================================================
    // Internal HTTP helpers
    // ========================================================================

    /// Check response for common errors.
    pub(crate) fn check_response(&self, response: &Response) -> Result<(), SteamUserError> {
        let status = response.status();

        // Detect login redirects that were auto-followed by reqwest.
        // The final status is 200 but the URL reveals we landed on the login page.
        // Strict host match (apex or true subdomain) prevents lookalikes like `evil-steamcommunity.com`.
        // Note: reqwest follows 30x by default, so a 302→/login arrives here as 200; the legacy
        // `is_redirection()` branch below would be dead code if we relied only on status.
        let url = response.url();
        let on_steam_host = url.host_str().is_some_and(|h| {
            h == "steamcommunity.com" || h.ends_with(".steamcommunity.com") || h == "steampowered.com" || h.ends_with(".steampowered.com")
        });
        let path = url.path();
        if on_steam_host && (path == "/login" || path.starts_with("/login/")) {
            return Err(SteamUserError::NotLoggedIn);
        }

        if status.is_success() {
            return Ok(());
        }

        if status == StatusCode::FORBIDDEN {
            return Err(SteamUserError::FamilyViewRestricted);
        }

        if status.is_client_error() || status.is_server_error() {
            let url = response.url().to_string();
            return Err(SteamUserError::HttpStatus { status: status.as_u16(), url });
        }

        Ok(())
    }

    /// Check if a JSON response indicates success.
    pub(crate) fn check_json_success<'a>(json: &'a serde_json::Value, error_msg: &str) -> Result<&'a serde_json::Value, SteamUserError> {
        if let Some(success) = json.get("success") {
            if let Some(b) = success.as_bool() {
                if b {
                    return Ok(json);
                }
            } else if let Some(i) = success.as_i64() {
                if i == 1 {
                    return Ok(json);
                }
            }
        }

        if let Some(eresult) = json.get("eresult").and_then(|v| v.as_i64()) {
            if eresult != 1 {
                return Err(SteamUserError::from_eresult(eresult as i32));
            }
        }

        Err(SteamUserError::SteamError(error_msg.to_string()))
    }
}

/// A wrapper around request builder that automatically appends
/// the session ID to POST data.
pub struct SteamRequestBuilder {
    builder: reqwest_middleware::RequestBuilder,
    session_id: Option<String>,
    session_limiter: Option<Arc<crate::limiter::SteamRateLimiter>>,
    request_body: Option<serde_json::Value>,
    query: Option<serde_json::Value>,
    http_method: reqwest::Method,
}

impl SteamRequestBuilder {
    /// Adds a form body to the request.
    ///
    /// If a session ID is available, it is automatically injected as
    /// `sessionid` and `sessionID` into the form data.
    pub fn form<T: serde::Serialize + ?Sized>(mut self, form: &T) -> Self {
        if let Some(session_id) = &self.session_id {
            // We need to merge the session ID into the form.
            // This is tricky because T is generic.
            // We convert to a Value first.
            if let Ok(mut value) = serde_json::to_value(form) {
                if let Some(obj) = value.as_object_mut() {
                    obj.insert("sessionid".to_string(), serde_json::Value::String(session_id.clone()));
                    obj.insert("sessionID".to_string(), serde_json::Value::String(session_id.clone()));
                    self.request_body = Some(serde_json::Value::Object(obj.clone()));
                    self.builder = self.builder.form(&value);
                    return self;
                } else if let Some(arr) = value.as_array() {
                    // Handle array of tuples [["key", "val"], ...] or [("key", "val"), ...]
                    // Convert to a map for proper form serialization
                    let mut map = serde_json::Map::new();
                    for item in arr {
                        if let Some(tuple_arr) = item.as_array() {
                            if tuple_arr.len() == 2 {
                                if let (Some(key), Some(val)) = (tuple_arr[0].as_str(), tuple_arr[1].as_str()) {
                                    map.insert(key.to_string(), serde_json::Value::String(val.to_string()));
                                }
                            }
                        }
                    }
                    map.insert("sessionid".to_string(), serde_json::Value::String(session_id.clone()));
                    map.insert("sessionID".to_string(), serde_json::Value::String(session_id.clone()));
                    self.request_body = Some(serde_json::Value::Object(map.clone()));
                    self.builder = self.builder.form(&serde_json::Value::Object(map));
                    return self;
                }
            }
        }
        self.request_body = serde_json::to_value(form).ok();
        self.builder = self.builder.form(form);
        self
    }

    /// Adds a multipart form body to the request.
    ///
    /// If a session ID is available, it is automatically appended to the
    /// multipart data.
    pub fn multipart(mut self, mut form: reqwest::multipart::Form) -> Self {
        if let Some(session_id) = &self.session_id {
            form = form.text("sessionid", session_id.clone()).text("sessionID", session_id.clone());
        }
        self.builder = self.builder.multipart(form);
        self
    }

    /// Adds a query parameter to the request.
    pub fn query<T: serde::Serialize + ?Sized>(mut self, query: &T) -> Self {
        if let Ok(value) = serde_json::to_value(query) {
            if let Some(ref mut existing) = self.query {
                if let (Some(e_obj), Some(n_obj)) = (existing.as_object_mut(), value.as_object()) {
                    for (k, v) in n_obj {
                        e_obj.insert(k.clone(), v.clone());
                    }
                } else {
                    self.query = Some(value);
                }
            } else {
                self.query = Some(value);
            }
        }
        self.builder = self.builder.query(query);
        self
    }

    /// Adds a header to the request.
    pub fn header<K, V>(mut self, key: K, value: V) -> Self
    where
        reqwest::header::HeaderName: TryFrom<K>,
        <reqwest::header::HeaderName as TryFrom<K>>::Error: Into<http::Error>,
        reqwest::header::HeaderValue: TryFrom<V>,
        <reqwest::header::HeaderValue as TryFrom<V>>::Error: Into<http::Error>,
    {
        self.builder = self.builder.header(key, value);
        self
    }

    /// Sends the request and returns the response.
    pub async fn send(self) -> Result<reqwest::Response, reqwest_middleware::Error> {
        // Record the HTTP method on the current tracing span so the
        // `MongoLogLayer` can pick it up from the span tree.
        tracing::Span::current().record("http_method", self.http_method.as_str());

        // Resolve the active endpoint metadata (set by #[steam_endpoint]).
        // `None` is fine — utility methods like `logged_in` and
        // `renew_access_token` issue HTTP without going through an annotated
        // method; they fall back to global rate limiting only.
        let endpoint = crate::endpoint::current_endpoint();

        // 1. Per-session limit (sequential — bounded to this caller, never blocks others)
        if let Some(limiter) = &self.session_limiter {
            limiter.until_ready().await;
        }

        // 2. Acquire global permit first, then per-host permit sequentially.
        //    Acquiring them concurrently via tokio::join! wastes the host
        //    permit when the global limiter is mid-lockout (the host permit
        //    is consumed immediately, then we wait on global anyway).
        crate::limiter::wait_for_permit().await;
        if let Some(ep) = endpoint {
            crate::limiter::wait_for_host_permit(ep.host).await;
        }

        // Send request
        let response = self.builder.send().await?;

        let status = response.status();
        let url = response.url().clone();
        let headers = response.headers().clone();

        // Record the URL on the current span for the MongoLogLayer,
        // stripping sensitive query parameters.
        let safe_url = redact_url_params(&url);
        tracing::Span::current().record("url", safe_url.as_str());

        tracing::info!(status = %status, url = %safe_url, "steam response");

        // Bump the metric counter once per request. Deliberately not
        // status-code-aware in v1 — that lives on the tracing layer.
        if let Some(ep) = endpoint {
            crate::endpoint::metrics().record_call(ep);
        }

        // 4. Handle 429 Reactive Backoff (before consuming the body).
        //    Read Retry-After; accept delta-seconds and HTTP-date formats.
        if status == reqwest::StatusCode::TOO_MANY_REQUESTS {
            let retry_after = headers
                .get(reqwest::header::RETRY_AFTER)
                .and_then(|v| v.to_str().ok())
                .and_then(|s| {
                    // Try delta-seconds first
                    if let Ok(secs) = s.trim().parse::<u64>() {
                        return Some(std::time::Duration::from_secs(secs));
                    }
                    // Try HTTP-date format (RFC 7231)
                    if let Ok(dt) = httpdate::parse_http_date(s) {
                        let now = std::time::SystemTime::now();
                        return dt.duration_since(now).ok();
                    }
                    None
                })
                .unwrap_or_else(|| std::time::Duration::from_secs(60));
            crate::limiter::penalize_abuse(retry_after);
        }

        if tracing::enabled!(tracing::Level::DEBUG) {
            if let Some(ref req_body) = self.request_body {
                tracing::debug!(body = %req_body, "request body");
            }
            if let Some(ref query) = self.query {
                tracing::debug!(query = %query, "request query");
            }
        }

        // Stash the final URL before consuming the response — reqwest::Response::from(http::Response)
        // does not preserve it, so we capture it here for logging/debugging.
        let final_url = response.url().clone();

        // Buffer the response body so we can record `raw_response` on the
        // span for MongoLogLayer, then reconstruct the response for the caller.
        let version = response.version();
        let headers = response.headers().clone();
        let bytes = response.bytes().await?;

        let content_type = headers
            .get(reqwest::header::CONTENT_TYPE)
            .and_then(|h| h.to_str().ok())
            .unwrap_or("");

        // Record response metadata on the span for MongoLogLayer.
        if !content_type.is_empty() {
            tracing::Span::current().record("content_type", content_type);
        }
        let response_type_str = if content_type.contains("json") {
            "json"
        } else if content_type.contains("html") {
            "html"
        } else if content_type.contains("xml") {
            "xml"
        } else if content_type.contains("javascript") || content_type.contains("text") {
            "text"
        } else if content_type.contains("protobuf")
            || content_type.contains("octet-stream")
            || content_type.contains("image")
        {
            "binary"
        } else {
            "unknown"
        };
        tracing::Span::current().record("response_type", response_type_str);

        if content_type.contains("text")
            || content_type.contains("json")
            || content_type.contains("javascript")
            || content_type.contains("xml")
        {
            let body_str = String::from_utf8_lossy(&bytes);
            tracing::Span::current().record("raw_response", body_str.as_ref());
            if tracing::enabled!(tracing::Level::DEBUG) {
                tracing::debug!(body = %body_str, "response body");
            }
        } else if tracing::enabled!(tracing::Level::DEBUG) {
            tracing::debug!(bytes = bytes.len(), content_type, url = %final_url, "response body (binary)");
        }

        let mut builder = http::Response::builder().status(status).version(version);
        for (name, value) in headers.iter() {
            builder = builder.header(name, value);
        }
        let http_resp = builder.body(bytes).map_err(|e| {
            reqwest_middleware::Error::Middleware(anyhow::anyhow!(
                "Failed to reconstruct response: {e}"
            ))
        })?;
        Ok(reqwest::Response::from(http_resp))
    }

    /// Sets the request body.
    pub fn body<T: Into<reqwest::Body>>(mut self, body: T) -> Self {
        self.builder = self.builder.body(body);
        self
    }
}

const REDACTED_PARAMS: &[&str] = &["access_token", "key", "oauth_token", "webapi_token"];

fn redact_url_params(url: &reqwest::Url) -> String {
    if url.query().is_none() {
        return url.to_string();
    }

    let has_sensitive = url
        .query_pairs()
        .any(|(k, _)| REDACTED_PARAMS.contains(&k.as_ref()));

    if !has_sensitive {
        return url.to_string();
    }

    let mut redacted = url.clone();
    let filtered: Vec<(String, String)> = url
        .query_pairs()
        .map(|(k, v)| {
            if REDACTED_PARAMS.contains(&k.as_ref()) {
                (k.into_owned(), "[REDACTED]".to_string())
            } else {
                (k.into_owned(), v.into_owned())
            }
        })
        .collect();

    let qs: String = filtered
        .iter()
        .map(|(k, v)| format!("{k}={v}"))
        .collect::<Vec<_>>()
        .join("&");
    redacted.set_query(Some(&qs));
    redacted.to_string()
}

/// Token response from /chat/clientjstoken endpoint.
#[derive(Debug, serde::Deserialize)]
pub struct ClientJsToken {
    pub logged_in: bool,
    pub steamid: Option<String>,
    pub account_name: Option<String>,
    pub token: Option<String>,
}