steam-user 0.1.0

//! Group management services.

use std::sync::OnceLock;

use regex::Regex;
use scraper::Selector;
use steamid::SteamID;

use crate::{client::SteamUser, endpoint::steam_endpoint, error::SteamUserError};

static SEL_GROUP_VANITY_INPUT: OnceLock<Selector> = OnceLock::new();
fn sel_group_vanity_input() -> &'static Selector {
    SEL_GROUP_VANITY_INPUT.get_or_init(|| Selector::parse("form input[name=\"groupId\"]").expect("valid CSS selector"))
}

static SEL_ABUSE_ID: OnceLock<Selector> = OnceLock::new();
fn sel_abuse_id() -> &'static Selector {
    SEL_ABUSE_ID.get_or_init(|| Selector::parse("#reportAbuseModalContents form input[name=\"abuseID\"]").expect("valid CSS selector"))
}

static SEL_GROUPPAGE_HEADER_NAME: OnceLock<Selector> = OnceLock::new();
fn sel_grouppage_header_name() -> &'static Selector {
    SEL_GROUPPAGE_HEADER_NAME.get_or_init(|| Selector::parse(".grouppage_header_name").expect("valid CSS selector"))
}

static SEL_GROUP_HEADLINE: OnceLock<Selector> = OnceLock::new();
fn sel_group_headline() -> &'static Selector {
    SEL_GROUP_HEADLINE.get_or_init(|| Selector::parse(".maincontent .group_summary > h1").expect("valid CSS selector"))
}

static SEL_GROUP_SUMMARY: OnceLock<Selector> = OnceLock::new();
fn sel_group_summary() -> &'static Selector {
    SEL_GROUP_SUMMARY.get_or_init(|| Selector::parse(".maincontent .group_summary .formatted_group_summary").expect("valid CSS selector"))
}

static SEL_GROUPPAGE_LOGO: OnceLock<Selector> = OnceLock::new();
fn sel_grouppage_logo() -> &'static Selector {
    SEL_GROUPPAGE_LOGO.get_or_init(|| Selector::parse(".grouppage_logo img, .grouppage_resp_logo img").expect("valid CSS selector"))
}

static SEL_GROUP_PAGING: OnceLock<Selector> = OnceLock::new();
fn sel_group_paging() -> &'static Selector {
    SEL_GROUP_PAGING.get_or_init(|| Selector::parse(".group_paging").expect("valid CSS selector"))
}

static SEL_JOIN_CHAT_COUNT: OnceLock<Selector> = OnceLock::new();
fn sel_join_chat_count() -> &'static Selector {
    SEL_JOIN_CHAT_COUNT.get_or_init(|| Selector::parse(".joinchat_bg .joinchat_membercount .count").expect("valid CSS selector"))
}

static SEL_MEMBERCOUNT: OnceLock<Selector> = OnceLock::new();
fn sel_membercount() -> &'static Selector {
    SEL_MEMBERCOUNT.get_or_init(|| Selector::parse(".membercount").expect("valid CSS selector"))
}

static SEL_COUNT: OnceLock<Selector> = OnceLock::new();
fn sel_count() -> &'static Selector {
    SEL_COUNT.get_or_init(|| Selector::parse(".count").expect("valid CSS selector"))
}

static SEL_GROUPSTAT: OnceLock<Selector> = OnceLock::new();
fn sel_groupstat() -> &'static Selector {
    SEL_GROUPSTAT.get_or_init(|| Selector::parse(".groupstat").expect("valid CSS selector"))
}

static SEL_LABEL: OnceLock<Selector> = OnceLock::new();
fn sel_label() -> &'static Selector {
    SEL_LABEL.get_or_init(|| Selector::parse(".label").expect("valid CSS selector"))
}

static SEL_DATA: OnceLock<Selector> = OnceLock::new();
fn sel_data() -> &'static Selector {
    SEL_DATA.get_or_init(|| Selector::parse(".data").expect("valid CSS selector"))
}

static SEL_MEMBER_BLOCK: OnceLock<Selector> = OnceLock::new();
fn sel_member_block() -> &'static Selector {
    SEL_MEMBER_BLOCK.get_or_init(|| Selector::parse("#memberList > .member_block").expect("valid CSS selector"))
}

static SEL_LINK_FRIEND: OnceLock<Selector> = OnceLock::new();
fn sel_link_friend() -> &'static Selector {
    SEL_LINK_FRIEND.get_or_init(|| Selector::parse("a.linkFriend").expect("valid CSS selector"))
}

static SEL_MEMBER_IMG: OnceLock<Selector> = OnceLock::new();
fn sel_member_img() -> &'static Selector {
    SEL_MEMBER_IMG.get_or_init(|| Selector::parse("a > img").expect("valid CSS selector"))
}

static SEL_RANK_ICON: OnceLock<Selector> = OnceLock::new();
fn sel_rank_icon() -> &'static Selector {
    SEL_RANK_ICON.get_or_init(|| Selector::parse(".rank_icon").expect("valid CSS selector"))
}

static SEL_PAGEBTN: OnceLock<Selector> = OnceLock::new();
fn sel_pagebtn() -> &'static Selector {
    SEL_PAGEBTN.get_or_init(|| Selector::parse(".pagebtn").expect("valid CSS selector"))
}

static SEL_GROUP_LIST_OPTION: OnceLock<Selector> = OnceLock::new();
fn sel_group_list_option() -> &'static Selector {
    SEL_GROUP_LIST_OPTION.get_or_init(|| Selector::parse(".group_list_results > .group_list_option").expect("valid CSS selector"))
}

static SEL_INVITABLE_AVATAR_IMG: OnceLock<Selector> = OnceLock::new();
fn sel_invitable_avatar_img() -> &'static Selector {
    SEL_INVITABLE_AVATAR_IMG.get_or_init(|| Selector::parse(".playerAvatar img").expect("valid CSS selector"))
}

static SEL_GROUP_LIST_NAME: OnceLock<Selector> = OnceLock::new();
fn sel_group_list_name() -> &'static Selector {
    SEL_GROUP_LIST_NAME.get_or_init(|| Selector::parse(".group_list_groupname").expect("valid CSS selector"))
}

static RE_OPEN_GROUP_CHAT: OnceLock<Regex> = OnceLock::new();
fn re_open_group_chat() -> &'static Regex {
    RE_OPEN_GROUP_CHAT.get_or_init(|| Regex::new(r"OpenGroupChat\(\s*'(\d+)'\s*\)").expect("valid regex"))
}

impl SteamUser {
    /// Joins a Steam group.
    ///
    /// # Arguments
    ///
    /// * `group_id` - The [`SteamID`] of the group to join.
    #[steam_endpoint(POST, host = Community, path = "/actions/GroupInvite", kind = Write)]
    pub async fn join_group(&self, group_id: SteamID) -> Result<(), SteamUserError> {
        let gid_str = group_id.steam_id64().to_string();

        let response: serde_json::Value = self.post_path("/actions/GroupInvite").form(&[("group", gid_str.as_str()), ("json", "1"), ("type", "groupInvite")]).send().await?.json().await?;

        Self::check_json_success(&response, "Failed to join group")?;

        Ok(())
    }

    /// Leaves a Steam group.
    ///
    /// # Arguments
    ///
    /// * `group_id` - The [`SteamID`] of the group to leave.
    #[steam_endpoint(POST, host = Community, path = "/groups/{group_id}/leave", kind = Write)]
    pub async fn leave_group(&self, group_id: SteamID) -> Result<(), SteamUserError> {
        let response = self.post_path(format!("/groups/{}/leave", group_id.steam_id64())).form(&[("action", "leaveGroup")]).send().await?;

        if response.status().is_success() {
            Ok(())
        } else {
            Err(SteamUserError::SteamError("Failed to leave group".into()))
        }
    }

    /// Retrieves the list of member SteamIDs for a given group.
    ///
    /// Fetches the members list by scraping the group's XML members list at
    /// `https://steamcommunity.com/gid/<id>/memberslistxml/?xml=1`.
    ///
    /// # Arguments
    ///
    /// * `group_id` - The [`SteamID`] of the group.
    ///
    /// # Returns
    ///
    /// Returns a `Vec<SteamID>` containing all members of the group.
    #[steam_endpoint(GET, host = Community, path = "/gid/{group_id}/memberslistxml/", kind = Read)]
    pub async fn get_group_members(&self, group_id: SteamID) -> Result<Vec<SteamID>, SteamUserError> {
        // XML view is often easier to parse for members list: memberslistxml/?xml=1
        let response = self.get_path(format!("/gid/{}/memberslistxml/?xml=1", group_id.steam_id64())).send().await?.text().await?;

        // Parse XML using quick-xml
        use quick_xml::{events::Event, reader::Reader};

        let mut reader = Reader::from_str(&response);
        reader.config_mut().trim_text(true);

        let mut members = Vec::new();
        let mut buf = Vec::new();

        // Track if we are inside a <steamID64> tag
        let mut inside_steam_id = false;

        loop {
            match reader.read_event_into(&mut buf) {
                Ok(Event::Start(e)) if e.name().as_ref() == b"steamID64" => {
                    inside_steam_id = true;
                }
                Ok(Event::Text(e)) if inside_steam_id => {
                    let text = std::str::from_utf8(&e).unwrap_or_default();
                    if let Ok(id) = text.parse::<u64>() {
                        members.push(SteamID::from(id));
                    }
                }
                Ok(Event::End(e)) if e.name().as_ref() == b"steamID64" => {
                    inside_steam_id = false;
                }
                Ok(Event::Eof) => break,
                Err(e) => {
                    tracing::warn!(error = ?e, "get_group_members: XML reader error; ending parse with partial result");
                    break;
                }
                _ => (),
            }
            buf.clear();
        }

        Ok(members)
    }

    /// Posts an announcement to a Steam group.
    ///
    /// # Arguments
    ///
    /// * `group_id` - The [`SteamID`] of the group.
    /// * `headline` - The title of the announcement.
    /// * `content` - The body text of the announcement.
    #[steam_endpoint(POST, host = Community, path = "/gid/{group_id}/announcements", kind = Write)]
    pub async fn post_group_announcement(&self, group_id: SteamID, headline: &str, content: &str) -> Result<(), SteamUserError> {
        let response: serde_json::Value = self.post_path(format!("/gid/{}/announcements", group_id.steam_id64())).form(&[("action", "post"), ("headline", headline), ("body", content), ("languages[0][headline]", headline), ("languages[0][body]", content)]).send().await?.json().await?;

        Self::check_json_success(&response, "Failed to post announcement")?;

        Ok(())
    }

    /// Kicks a member from a Steam group.
    ///
    /// # Arguments
    ///
    /// * `group_id` - The [`SteamID`] of the group.
    /// * `member_id` - The [`SteamID`] of the member to kick.
    #[steam_endpoint(POST, host = Community, path = "/gid/{group_id}/membersManage", kind = Write)]
    pub async fn kick_group_member(&self, group_id: SteamID, member_id: SteamID) -> Result<(), SteamUserError> {
        let mid_str = member_id.steam_id64().to_string();

        let response: serde_json::Value = self.post_path(format!("/gid/{}/membersManage", group_id.steam_id64())).form(&[("action", "kick"), ("memberId", mid_str.as_str()), ("queryString", "")]).send().await?.json().await?;

        Self::check_json_success(&response, "Failed to kick member")?;

        Ok(())
    }

    // unimplemented stub — no #[steam_endpoint] until a real network call exists
    #[tracing::instrument(skip(self, _image_path), fields(target_steam_id = _steam_id.steam_id64()))]
    pub async fn send_image_message(&self, _image_path: impl AsRef<std::path::Path>, _steam_id: SteamID) -> Result<crate::types::CommitFileUploadResponse, SteamUserError> {
        self.send_image_message_inner(_image_path, _steam_id).await
    }

    async fn send_image_message_inner(&self, _image_path: impl AsRef<std::path::Path>, _steam_id: SteamID) -> Result<crate::types::CommitFileUploadResponse, SteamUserError> {
        // ...
        Ok(crate::types::CommitFileUploadResponse { success: 1, result: None, error: None })
    }

    /// Invites a user to a Steam group.
    ///
    /// # Arguments
    ///
    /// * `user_id` - The [`SteamID`] of the user to invite.
    /// * `group_id` - The [`SteamID`] of the group to invite them to.
    #[steam_endpoint(POST, host = Community, path = "/actions/GroupInvite", kind = Write)]
    pub async fn invite_user_to_group(&self, user_id: SteamID, group_id: SteamID) -> Result<(), SteamUserError> {
        let gid_str = group_id.steam_id64().to_string();
        let uid_str = user_id.steam_id64().to_string();

        let response: serde_json::Value = self.post_path("/actions/GroupInvite").form(&[("group", gid_str.as_str()), ("invitee", uid_str.as_str()), ("json", "1"), ("type", "groupInvite")]).send().await?.json().await?;

        Self::check_json_success(&response, "Failed to invite user to group")?;

        Ok(())
    }

    /// Invites multiple users to a Steam group in a single request.
    ///
    /// # Arguments
    ///
    /// * `user_ids` - A slice of [`SteamID`]s of the users to invite.
    /// * `group_id` - The [`SteamID`] of the group.
    #[steam_endpoint(POST, host = Community, path = "/actions/GroupInvite", kind = Write)]
    pub async fn invite_users_to_group(&self, user_ids: &[SteamID], group_id: SteamID) -> Result<(), SteamUserError> {
        if user_ids.is_empty() {
            return Ok(());
        }

        if user_ids.len() == 1 {
            return self.invite_user_to_group(user_ids[0], group_id).await;
        }

        let gid_str = group_id.steam_id64().to_string();
        let invitee_list: Vec<String> = user_ids.iter().map(|id| id.steam_id64().to_string()).collect();
        let invitee_list_json = serde_json::to_string(&invitee_list).map_err(|e| SteamUserError::Other(e.to_string()))?;

        let response: serde_json::Value = self.post_path("/actions/GroupInvite").form(&[("group", gid_str.as_str()), ("invitee_list", invitee_list_json.as_str()), ("json", "1"), ("type", "groupInvite")]).send().await?.json().await?;

        Self::check_json_success(&response, "Failed to invite users to group")?;

        Ok(())
    }

    /// Responds to a Steam group invitation by accepting or ignoring it.
    ///
    /// This is the core function for handling group invitations. Use the
    /// convenience methods [`Self::accept_group_invite`] or
    /// [`Self::ignore_group_invite`] for simpler usage.
    ///
    /// # Arguments
    /// * `group_id` - The SteamID of the group whose invitation to respond to.
    /// * `accept` - If `true`, accepts the invite; if `false`, ignores/declines
    ///   it.
    ///
    /// # Returns
    /// * `Ok(())` on success.
    /// * `Err(SteamUserError)` if the request fails or the response indicates
    ///   failure.
    #[steam_endpoint(POST, host = Community, path = "/profiles/{steam_id}/friends/action", kind = Write)]
    pub async fn respond_to_group_invite(&self, group_id: SteamID, accept: bool) -> Result<(), SteamUserError> {
        let my_steam_id_str = self.session.steam_id.ok_or(SteamUserError::NotLoggedIn)?.steam_id64().to_string();
        let group_steam_id = group_id.steam_id64().to_string();
        let action = if accept { "group_accept" } else { "group_ignore" };

        let response: serde_json::Value = self.post_path(format!("/profiles/{}/friends/action", my_steam_id_str)).form(&[("steamid", my_steam_id_str.as_str()), ("ajax", "1"), ("action", action), ("steamids[]", group_steam_id.as_str())]).send().await?.json().await?;

        Self::check_json_success(&response, &format!("Failed to {} group invite", if accept { "accept" } else { "ignore" }))?;

        Ok(())
    }

    /// Accept a pending Steam group invitation.
    ///
    /// This is a convenience wrapper around [`Self::respond_to_group_invite`]
    /// with `accept = true`.
    ///
    /// # Arguments
    /// * `group_id` - The SteamID of the group whose invitation to accept.
    ///
    /// # Returns
    /// * `Ok(())` on success.
    /// * `Err(SteamUserError)` if the request fails.
    // delegates to `respond_to_group_invite` — no #[steam_endpoint]
    #[tracing::instrument(skip(self), fields(group_id = group_id.steam_id64()))]
    pub async fn accept_group_invite(&self, group_id: SteamID) -> Result<(), SteamUserError> {
        self.respond_to_group_invite(group_id, true).await
    }

    /// Ignore/decline a pending Steam group invitation.
    ///
    /// This is a convenience wrapper around [`Self::respond_to_group_invite`]
    /// with `accept = false`.
    ///
    /// # Arguments
    /// * `group_id` - The SteamID of the group whose invitation to ignore.
    ///
    /// # Returns
    /// * `Ok(())` on success.
    /// * `Err(SteamUserError)` if the request fails.
    // delegates to `respond_to_group_invite` — no #[steam_endpoint]
    #[tracing::instrument(skip(self), fields(group_id = group_id.steam_id64()))]
    pub async fn ignore_group_invite(&self, group_id: SteamID) -> Result<(), SteamUserError> {
        self.respond_to_group_invite(group_id, false).await
    }

    /// Fetches an overview of a group, including member counts, headline, and
    /// summary.
    ///
    /// # Arguments
    ///
    /// * `options` - A [`crate::types::GroupOverviewOptions`] struct specifying
    ///   the group and pagination settings.
    ///
    /// # Returns
    ///
    /// Returns a [`crate::types::GroupOverview`] struct with the gathered
    /// information.
    #[steam_endpoint(GET, host = Community, path = "/gid/{group_id}/", kind = Read)]
    pub async fn get_group_overview(&self, options: crate::types::GroupOverviewOptions) -> Result<crate::types::GroupOverview, SteamUserError> {
        let path = if let Some(gid) = options.gid {
            format!("/gid/{}/", gid.steam_id64())
        } else if let Some(group_url) = options.group_url {
            format!("/groups/{}/", group_url)
        } else {
            return Err(SteamUserError::Other("Missing group identifier".into()));
        };

        let mut request = self.get_path(&path);
        if options.page > 1 {
            request = request.query(&[("p", &options.page.to_string())]);
        }
        if let Some(search) = options.search_key.as_ref() {
            request = request.query(&[("searchKey", search.as_str())]);
        }

        let response = request.send().await?.text().await?;
        // Group overview pages can list 1000+ members; parsing them is the
        // largest CPU cost in this service. Run it on the blocking pool.
        tokio::task::spawn_blocking(move || parse_group_overview(&response)).await.map_err(|e| SteamUserError::Other(format!("group-overview parse task failed: {e}")))?
    }

    /// Resolves a group vanity URL to its SteamID.
    ///
    /// # Arguments
    ///
    /// * `vanity_url` - The group's vanity URL (e.g., "valve" for
    ///   steamcommunity.com/groups/valve)
    ///
    /// # Returns
    ///
    /// Returns the group's SteamID64 as a string, or an error if not found.
    ///
    /// # Example
    ///
    /// ```ignore
    /// let group_id = client.get_group_steam_id_from_vanity_url("valve").await?;
    /// ```
    #[steam_endpoint(GET, host = Community, path = "/groups/{vanity_url}", kind = Read)]
    pub async fn get_group_steam_id_from_vanity_url(&self, vanity_url: &str) -> Result<String, SteamUserError> {
        let response = self.get_path(format!("/groups/{}", urlencoding::encode(vanity_url))).send().await?.text().await?;

        // Try to find OpenGroupChat('XXXX')
        if let Some(caps) = re_open_group_chat().captures(&response) {
            if let Some(id) = caps.get(1) {
                return Ok(id.as_str().to_string());
            }
        }

        // Fallback: parse HTML for form input
        let document = scraper::Html::parse_document(&response);
        if let Some(el) = document.select(sel_group_vanity_input()).next() {
            if let Some(id) = el.value().attr("value") {
                return Ok(id.to_string());
            }
        }

        Err(SteamUserError::MalformedResponse("Could not find group ID from vanity URL".into()))
    }

    /// Gets group information via the XML API.
    ///
    /// # Arguments
    ///
    /// * `gid` - Optional group SteamID. If provided, uses
    ///   `/gid/{id}/memberslistxml/`.
    /// * `group_url` - Optional group vanity URL. If provided, uses
    ///   `/groups/{url}/memberslistxml/`.
    /// * `page` - Page number (1-indexed, default 1).
    ///
    /// # Returns
    ///
    /// Returns a [`crate::types::GroupInfoXml`] struct with group details and
    /// member list.
    #[steam_endpoint(GET, host = Community, path = "/gid/{group_id}/memberslistxml/", kind = Read)]
    pub async fn get_group_info_xml(&self, gid: Option<SteamID>, group_url: Option<&str>, page: Option<u32>) -> Result<crate::types::GroupInfoXml, SteamUserError> {
        let page = page.unwrap_or(1);
        let path = if let Some(id) = gid {
            format!("/gid/{}/memberslistxml/?xml=1&p={}", id.steam_id64(), page)
        } else if let Some(url) = group_url {
            format!("/groups/{}/memberslistxml/?xml=1&p={}", urlencoding::encode(url), page)
        } else {
            return Err(SteamUserError::Other("Either gid or group_url must be provided".into()));
        };

        let response = self.get_path(&path).send().await?.text().await?;
        parse_group_info_xml(&response)
    }

    /// Gets full group information via the XML API, paginating through all
    /// members.
    ///
    /// # Arguments
    ///
    /// * `gid` - Optional group SteamID.
    /// * `group_url` - Optional group vanity URL.
    ///
    /// # Returns
    ///
    /// Returns a [`crate::types::GroupInfoXml`] struct with all members across
    /// all pages.
    // paginates `get_group_info_xml` — no #[steam_endpoint]
    #[tracing::instrument(skip(self), fields(group_id = gid.map(|g| g.steam_id64()), group_url = group_url))]
    pub async fn get_group_info_xml_full(&self, gid: Option<SteamID>, group_url: Option<&str>) -> Result<crate::types::GroupInfoXml, SteamUserError> {
        let mut all_members = Vec::new();
        let mut page = 1u32;
        let mut group_info: Option<crate::types::GroupInfoXml> = None;

        loop {
            let info = self.get_group_info_xml(gid, group_url, Some(page)).await?;

            if group_info.is_none() {
                group_info = Some(info.clone());
            }

            all_members.extend(info.members);

            if info.next_page_link.is_none() || page >= info.total_pages {
                break;
            }
            page += 1;
        }

        let mut result = group_info.ok_or_else(|| SteamUserError::MalformedResponse("No group info returned".into()))?;
        result.members = all_members;
        result.next_page_link = None;
        Ok(result)
    }

    /// Gets the list of groups that a user can be invited to.
    ///
    /// # Arguments
    ///
    /// * `user_steam_id` - The SteamID of the user to check invitable groups
    ///   for.
    ///
    /// # Returns
    ///
    /// Returns a list of [`crate::types::InvitableGroup`] that the user can be
    /// invited to.
    #[steam_endpoint(GET, host = Community, path = "/profiles/{user_steam_id}/ajaxgroupinvite", kind = Read)]
    pub async fn get_invitable_groups(&self, user_steam_id: SteamID) -> Result<Vec<crate::types::InvitableGroup>, SteamUserError> {
        let response = self.get_path(format!("/profiles/{}/ajaxgroupinvite?new_profile=1", user_steam_id.steam_id64())).send().await?.text().await?;
        parse_invitable_groups(&response)
    }

    /// Invites all friends to a Steam group.
    ///
    /// For each friend, checks if the group is invitable, and if so, sends an
    /// invite.
    ///
    /// # Arguments
    ///
    /// * `group_id` - The SteamID of the group to invite friends to.
    ///
    /// # Returns
    ///
    /// Returns `Ok(())` on completion. Individual invite failures are silently
    /// ignored.
    // composite — no #[steam_endpoint]
    #[tracing::instrument(skip(self), fields(group_id = group_id.steam_id64()))]
    pub async fn invite_all_friends_to_group(&self, group_id: SteamID) -> Result<(), SteamUserError> {
        let friends = self.get_friends_list().await?;
        let group_id_str = group_id.steam_id64().to_string();

        for (friend_steam_id, _relationship) in friends {
            let invitable_groups = match self.get_invitable_groups(friend_steam_id).await {
                Ok(groups) => groups,
                Err(e) => {
                    tracing::warn!(friend = %friend_steam_id.steam_id64(), error = %e, "invite_all_friends_to_group: get_invitable_groups failed; skipping friend");
                    continue;
                }
            };

            let can_invite = invitable_groups.iter().any(|g| g.id.steam_id64().to_string() == group_id_str);

            if can_invite {
                if let Err(e) = self.invite_user_to_group(friend_steam_id, group_id).await {
                    tracing::warn!(friend = %friend_steam_id.steam_id64(), group = %group_id_str, error = %e, "invite_all_friends_to_group: invite_user_to_group failed; continuing");
                }
            }
        }

        Ok(())
    }
}

fn parse_group_overview(html: &str) -> Result<crate::types::GroupOverview, SteamUserError> {
    let document = scraper::Html::parse_document(html);

    // GID extraction
    let mut gid = None;
    if let Some(start) = html.find("InitializeCommentThread( \"Clan\", \"Clan_") {
        let rest = &html[start + 40..];
        if let Some(end) = rest.find("\",") {
            if let Ok(id) = rest[..end].parse::<u64>() {
                gid = Some(SteamID::from(id));
            }
        }
    }

    if gid.is_none() {
        if let Some(el) = document.select(sel_abuse_id()).next() {
            if let Some(val) = el.value().attr("value") {
                if let Ok(id) = val.parse::<u64>() {
                    gid = Some(SteamID::from(id));
                }
            }
        }
    }

    let gid = gid.ok_or_else(|| SteamUserError::MalformedResponse("Could not find Group ID".into()))?;

    // Name
    let mut name = String::new();
    if let Some(start) = html.find("g_strGroupName = \"") {
        let rest = &html[start + 18..];
        if let Some(end) = rest.find("\";") {
            name = rest[..end].to_string();
        }
    }
    if name.is_empty() {
        if let Some(el) = document.select(sel_grouppage_header_name()).next() {
            name = el.text().collect::<Vec<_>>().join(" ").trim().to_string();
        }
    }

    // URL
    let mut group_url = None;
    if let Some(start) = html.find("InitGroupPage( 'https://steamcommunity.com/groups/") {
        let rest = &html[start + 50..];
        if let Some(end) = rest.find("',") {
            group_url = Some(rest[..end].trim_end_matches('/').to_string());
        }
    }

    // Headline
    let headline = document.select(sel_group_headline()).next().map(|el| el.text().collect::<Vec<_>>().join(" ").trim().to_string());

    // Summary
    let summary = document.select(sel_group_summary()).next().map(|el| el.inner_html().replace("\t", "").replace("\n", "").replace("\r", ""));

    // Avatar Hash
    let avatar_url = document.select(sel_grouppage_logo()).next().and_then(|el| el.value().attr("src"));
    let avatar_hash = if let Some(url) = avatar_url {
        // Extract hash from URL: .../fef49e7fa7e1997310d705b2a6158ff8dc1cdfeb_full.jpg
        url.split('/').next_back().and_then(|s| s.split('_').next()).unwrap_or("").to_string()
    } else {
        String::new()
    };

    // Member counts
    let mut member_count = 0;
    let mut members_online = 0;
    let mut members_in_game = 0;
    let mut members_in_chat = 0;
    let mut member_detail_count = 0;

    for el in document.select(sel_group_paging()) {
        let text = el.text().collect::<String>().to_lowercase();
        if text.contains("members") {
            let count_text = text.split("members").next().unwrap_or("").trim();
            // Handle "1-15 of 1,234"
            let final_count = if count_text.contains("of") { count_text.split("of").last().unwrap_or("") } else { count_text };
            member_count = final_count.replace(",", "").trim().parse().unwrap_or(0);
        }
    }

    if let Some(el) = document.select(sel_join_chat_count()).next() {
        members_in_chat = el.text().collect::<String>().replace(",", "").trim().parse().unwrap_or(0);
    }

    for el in document.select(sel_membercount()) {
        let class = el.value().attr("class").unwrap_or("");
        let count = el.select(sel_count()).next().map(|c| c.text().collect::<String>().replace(",", "").trim().parse().unwrap_or(0)).unwrap_or(0);

        if class.contains("ingame") {
            members_in_game = count;
        } else if class.contains("online") {
            members_online = count;
        } else if class.contains("members") {
            member_detail_count = count;
        }
    }

    // Founded, Language, Location
    let mut founded_str = None;
    let mut language = None;
    let mut location = None;

    for el in document.select(sel_groupstat()) {
        let label = el.select(sel_label()).next().map(|l| l.text().collect::<String>().trim().to_lowercase());
        let data = el.select(sel_data()).next().map(|d| d.text().collect::<String>().trim().to_string());

        match label.as_deref() {
            Some("founded") => founded_str = data,
            Some("language") => language = data,
            Some("location") => location = data,
            _ => {}
        }
    }

    // Members list
    let mut members = Vec::new();
    for el in document.select(sel_member_block()) {
        let link_el = el.select(sel_link_friend()).next();
        let name = link_el.map(|l| l.text().collect::<String>().trim().to_string()).unwrap_or_default();
        let profile_url = link_el.and_then(|l| l.value().attr("href")).unwrap_or_default();

        // data-miniprofile is a 32-bit Steam account ID. Parse directly into u32
        // so an out-of-range value is rejected (None) instead of silently
        // truncating into a corrupted SteamID.
        let miniprofile = el.value().attr("data-miniprofile").and_then(|m| m.parse::<u32>().ok()).unwrap_or(0);
        let steamid = SteamID::from_individual_account_id(miniprofile);

        let avatar_url = el.select(sel_member_img()).next().and_then(|i| i.value().attr("src")).unwrap_or("");
        let avatar_hash = avatar_url.split('/').next_back().and_then(|s| s.split('_').next()).unwrap_or("").to_string();

        let custom_url = if profile_url.contains("/id/") { Some(profile_url.trim_end_matches('/').split('/').next_back().unwrap_or("").to_string()) } else { None };

        let rank = el.select(sel_rank_icon()).next().and_then(|r| r.value().attr("title")).map(|t| t.trim().to_string());

        members.push(crate::types::GroupOverviewMember { steamid, name, avatar_hash, custom_url, rank });
    }

    // Pagination
    let mut total_pages = 1;
    let mut current_page = 1;
    let mut next_page = None;
    let mut next_page_link = None;

    for el in document.select(sel_pagebtn()) {
        let text = el.text().collect::<String>().trim().to_string();
        let href = el.value().attr("href").unwrap_or("");

        if let Some(p_start) = href.find("p=") {
            let p_str = &href[p_start + 2..].split('#').next().unwrap_or("");
            if let Ok(p) = p_str.parse::<i32>() {
                total_pages = total_pages.max(p);
                if text == ">" {
                    next_page = Some(p);
                    next_page_link = Some(href.replace("#members", "/members"));
                }
            }
        }
    }

    // We can't easily determine current page from the buttons alone if it's not in
    // the URL, but usually it's passed in. For now we assume if next_page is P,
    // current is P-1.
    if let Some(next) = next_page {
        current_page = next - 1;
    } else if total_pages > 1 {
        current_page = total_pages;
    }

    Ok(crate::types::GroupOverview {
        id: gid,
        name,
        url: group_url,
        headline,
        summary,
        avatar_hash,
        member_count,
        member_detail_count,
        members_online,
        members_in_chat,
        members_in_game,
        total_pages,
        current_page,
        next_page,
        next_page_link,
        members,
        founded_str,
        language,
        location,
    })
}

/// Parses XML API response for group info.
fn parse_group_info_xml(xml: &str) -> Result<crate::types::GroupInfoXml, SteamUserError> {
    use quick_xml::{events::Event, reader::Reader};

    let mut reader = Reader::from_str(xml);
    reader.config_mut().trim_text(true);

    let mut buf = Vec::new();
    let mut current_tag = String::new();
    let mut in_member_list = false;
    let mut in_group_details = false;

    let mut group_id: Option<SteamID> = None;
    let mut name = String::new();
    let mut url = String::new();
    let mut headline: Option<String> = None;
    let mut summary: Option<String> = None;
    let mut avatar_icon = String::new();
    let mut avatar_medium = String::new();
    let mut avatar_full = String::new();
    let mut member_count = 0u32;
    let mut member_detail_count = 0u32;
    let mut members_in_chat = 0u32;
    let mut members_in_game = 0u32;
    let mut members_online = 0u32;
    let mut total_pages = 0u32;
    let mut current_page = 0u32;
    let mut starting_member = 0u32;
    let mut next_page_link: Option<String> = None;
    let mut members: Vec<SteamID> = Vec::new();

    loop {
        match reader.read_event_into(&mut buf) {
            Ok(Event::Start(e)) => {
                let tag_name = String::from_utf8_lossy(e.name().as_ref()).to_string();
                current_tag = tag_name.clone();
                if tag_name == "members" {
                    in_member_list = true;
                } else if tag_name == "groupDetails" {
                    in_group_details = true;
                }
            }
            Ok(Event::End(e)) => {
                let tag_name = String::from_utf8_lossy(e.name().as_ref()).to_string();
                if tag_name == "members" {
                    in_member_list = false;
                } else if tag_name == "groupDetails" {
                    in_group_details = false;
                }
                current_tag.clear();
            }
            Ok(Event::Text(e)) => {
                let text = String::from_utf8_lossy(&e).trim().to_string();
                if text.is_empty() {
                    continue;
                }

                match current_tag.as_str() {
                    "groupID64" if !in_member_list => {
                        if let Ok(id) = text.parse::<u64>() {
                            group_id = Some(SteamID::from(id));
                        }
                    }
                    "groupName" if in_group_details => {
                        name = text;
                    }
                    "groupURL" if in_group_details => {
                        url = text;
                    }
                    "headline" if in_group_details => {
                        headline = Some(text);
                    }
                    "summary" if in_group_details => {
                        summary = Some(text);
                    }
                    "avatarIcon" if in_group_details => {
                        avatar_icon = text;
                    }
                    "avatarMedium" if in_group_details => {
                        avatar_medium = text;
                    }
                    "avatarFull" if in_group_details => {
                        avatar_full = text;
                    }
                    "memberCount" if in_group_details => {
                        member_detail_count = text.replace(",", "").parse().unwrap_or(0);
                    }
                    "membersInChat" if in_group_details => {
                        members_in_chat = text.replace(",", "").parse().unwrap_or(0);
                    }
                    "membersInGame" if in_group_details => {
                        members_in_game = text.replace(",", "").parse().unwrap_or(0);
                    }
                    "membersOnline" if in_group_details => {
                        members_online = text.replace(",", "").parse().unwrap_or(0);
                    }
                    "memberCount" if !in_group_details && !in_member_list => {
                        member_count = text.replace(",", "").parse().unwrap_or(0);
                    }
                    "totalPages" => {
                        total_pages = text.parse().unwrap_or(0);
                    }
                    "currentPage" => {
                        current_page = text.parse().unwrap_or(0);
                    }
                    "startingMember" => {
                        starting_member = text.parse().unwrap_or(0);
                    }
                    "nextPageLink" => {
                        next_page_link = Some(text);
                    }
                    "steamID64" if in_member_list => {
                        if let Ok(id) = text.parse::<u64>() {
                            members.push(SteamID::from(id));
                        }
                    }
                    _ => {}
                }
            }
            Ok(Event::Eof) => break,
            Err(e) => {
                tracing::warn!(error = ?e, "group XML parse error; ending parse with partial result");
                break;
            }
            _ => {}
        }
        buf.clear();
    }

    // Extract avatar hash from one of the avatar URLs
    let avatar_hash = [&avatar_full, &avatar_medium, &avatar_icon].iter().filter(|u| !u.is_empty()).find_map(|u| u.split('/').next_back().and_then(|s| s.split('_').next()).filter(|s| !s.is_empty()).map(|s| s.to_string())).unwrap_or_default();

    let group_id = group_id.ok_or_else(|| SteamUserError::MalformedResponse("Missing groupID64 in XML response".into()))?;

    Ok(crate::types::GroupInfoXml {
        id: group_id,
        name,
        url,
        headline,
        summary,
        avatar_hash,
        member_count,
        member_detail_count,
        members_in_chat,
        members_in_game,
        members_online,
        total_pages,
        current_page,
        starting_member,
        next_page_link,
        members,
    })
}

/// Parses HTML response for invitable groups.
fn parse_invitable_groups(html: &str) -> Result<Vec<crate::types::InvitableGroup>, SteamUserError> {
    let document = scraper::Html::parse_document(html.trim());
    let mut groups = Vec::new();

    for el in document.select(sel_group_list_option()) {
        let id_str = el.value().attr("data-groupid").unwrap_or("");
        let id = if let Ok(id) = id_str.parse::<u64>() {
            SteamID::from(id)
        } else {
            continue;
        };

        let avatar_hash = el.value().attr("_groupavatarhash").map(|s| s.to_string());

        let avatar_url = el.select(sel_invitable_avatar_img()).next().and_then(|i| i.value().attr("src")).map(|s| s.to_string());

        let name = el.select(sel_group_list_name()).next().map(|n| n.text().collect::<String>().trim().to_string()).unwrap_or_default();

        groups.push(crate::types::InvitableGroup { id, avatar_hash, avatar_url, name });
    }

    Ok(groups)
}