flatland-client-lib 0.2.24

//! Persistent client settings (game host, API base) for installed play.

use std::net::SocketAddr;
use std::path::PathBuf;

use serde::{Deserialize, Serialize};

pub const DEFAULT_GAME_PORT: u16 = 7373;
pub const DEFAULT_API_PORT: u16 = 7380;

#[derive(Debug, Clone, Serialize, Deserialize, Default)]
pub struct GfxWindowPrefs {
    /// Last window width in logical pixels.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub width: Option<u32>,
    /// Last window height in logical pixels.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub height: Option<u32>,
    /// Window X (platform coordinates; macOS AppKit bottom-left origin).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub x: Option<u32>,
    /// Window Y.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub y: Option<u32>,
}

#[derive(Debug, Clone, Serialize, Deserialize, Default)]
pub struct ClientConfig {
    /// Gateway host (IPv4, IPv6, or DNS name). Port defaults to 7373.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub game_host: Option<String>,
    /// Control plane HTTP port when `game_host` is set. Defaults to 7380.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub api_port: Option<u16>,
    /// Gateway TCP port when `game_host` is set. Defaults to 7373.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub game_port: Option<u16>,
    /// Gfx play window geometry (`flatland3-gfx`).
    #[serde(default, skip_serializing_if = "GfxWindowPrefs::is_empty")]
    pub gfx_window: GfxWindowPrefs,
    /// Last HUD view mode from `.` cycle: `normal` | `compact` | `map`.
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub hud_view: Option<String>,
    /// Bottom system LOG dock hidden (`'` toggle).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub hud_log_hidden: Option<bool>,
    /// Hired workers (`h`) menu compact vs detail (`c` toggle).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub workers_menu_compact: Option<bool>,
    /// Worker route editor sheet collapsed to the corner chip (`z` toggle).
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub worker_route_panel_collapsed: Option<bool>,
}

impl GfxWindowPrefs {
    pub fn is_empty(&self) -> bool {
        self.width.is_none()
            && self.height.is_none()
            && self.x.is_none()
            && self.y.is_none()
    }
}

impl ClientConfig {
    pub fn path() -> anyhow::Result<PathBuf> {
        let base = dirs::config_dir()
            .ok_or_else(|| anyhow::anyhow!("could not resolve config directory"))?;
        Ok(base.join("flatland").join("client.json"))
    }

    pub fn load() -> Self {
        Self::path()
            .ok()
            .and_then(|path| std::fs::read(&path).ok())
            .and_then(|bytes| serde_json::from_slice(&bytes).ok())
            .unwrap_or_default()
    }

    pub fn save(&self) -> anyhow::Result<()> {
        let path = Self::path()?;
        if let Some(parent) = path.parent() {
            std::fs::create_dir_all(parent)?;
        }
        std::fs::write(path, serde_json::to_vec_pretty(self)?)?;
        Ok(())
    }

    pub fn save_gfx_window(&mut self, prefs: GfxWindowPrefs) -> anyhow::Result<()> {
        self.gfx_window = prefs;
        self.save()
    }

    /// Persist the `.` HUD view mode (`normal` / `compact` / `map`).
    pub fn save_hud_view(&mut self, label: &str) -> anyhow::Result<()> {
        self.hud_view = Some(label.to_string());
        self.save()
    }

    pub fn save_hud_log_hidden(&mut self, hidden: bool) -> anyhow::Result<()> {
        self.hud_log_hidden = Some(hidden);
        self.save()
    }

    pub fn save_workers_menu_compact(&mut self, compact: bool) -> anyhow::Result<()> {
        self.workers_menu_compact = Some(compact);
        self.save()
    }

    pub fn save_worker_route_panel_collapsed(&mut self, collapsed: bool) -> anyhow::Result<()> {
        self.worker_route_panel_collapsed = Some(collapsed);
        self.save()
    }

    pub fn set_game_host(&mut self, host: impl Into<String>) -> anyhow::Result<()> {
        let host = normalize_host_input(&host.into())?;
        let default_port = self.game_port.unwrap_or(DEFAULT_GAME_PORT);
        let (host_only, port) = split_host_port(&host, default_port);
        self.game_host = Some(host_only);
        if port != DEFAULT_GAME_PORT || self.game_port.is_some() {
            self.game_port = Some(port);
        }
        self.save()
    }

    /// Host string for UI (never empty — falls back to localhost).
    pub fn display_game_host(&self) -> String {
        self.game_host
            .clone()
            .unwrap_or_else(|| "127.0.0.1".into())
    }

    /// Resolve gateway TCP address (supports DNS names like `server1.flatland3.com`).
    pub fn resolve_game_server_addr(&self) -> anyhow::Result<std::net::SocketAddr> {
        use std::net::ToSocketAddrs;
        let host = self.game_host.as_deref().unwrap_or("127.0.0.1");
        let port = self.game_port.unwrap_or(DEFAULT_GAME_PORT);
        let (host, port) = split_host_port(host, port);
        let target = format!("{host}:{port}");
        target
            .to_socket_addrs()
            .map_err(|e| anyhow::anyhow!("could not resolve {target}: {e}"))?
            .next()
            .ok_or_else(|| anyhow::anyhow!("no addresses found for {target}"))
    }

    pub fn game_server_addr(&self) -> SocketAddr {
        self.resolve_game_server_addr().unwrap_or_else(|_| {
            "127.0.0.1:7373"
                .parse()
                .expect("valid default addr")
        })
    }

    pub fn api_base_url(&self) -> String {
        if let Some(host) = self.game_host.as_deref() {
            let port = self.api_port.unwrap_or(DEFAULT_API_PORT);
            if host.starts_with("http://") || host.starts_with("https://") {
                return host.trim_end_matches('/').to_string();
            }
            let (host, _) = split_host_port(host, port);
            return format!("http://{host}:{port}");
        }
        "http://127.0.0.1:7380".into()
    }
}

pub fn default_game_server_addr() -> SocketAddr {
    if let Ok(addr) = std::env::var("FLATLAND_GATEWAY_ADDR") {
        if let Ok(parsed) = addr.parse() {
            return parsed;
        }
    }
    ClientConfig::load().game_server_addr()
}

pub fn default_api_base_url() -> String {
    if let Ok(url) = std::env::var("FLATLAND_API_URL") {
        return url;
    }
    ClientConfig::load().api_base_url()
}

/// Strip scheme/path and reject empty hosts. Allows DNS names and `host:port`.
fn normalize_host_input(raw: &str) -> anyhow::Result<String> {
    let mut host = raw.trim().to_string();
    if host.is_empty() {
        anyhow::bail!("game host cannot be empty");
    }
    if let Some(rest) = host.strip_prefix("https://") {
        host = rest.to_string();
    } else if let Some(rest) = host.strip_prefix("http://") {
        host = rest.to_string();
    }
    if let Some((h, _)) = host.split_once('/') {
        host = h.to_string();
    }
    host = host.trim_end_matches('/').to_string();
    if host.is_empty() {
        anyhow::bail!("game host cannot be empty");
    }
    Ok(host)
}

fn split_host_port(host: &str, default_port: u16) -> (String, u16) {
    // IPv6 in brackets: [2001:db8::1]:7373
    if let Some(rest) = host.strip_prefix('[') {
        if let Some((addr, port_part)) = rest.split_once("]:") {
            if let Ok(p) = port_part.parse::<u16>() {
                return (format!("[{addr}]"), p);
            }
        }
        return (host.to_string(), default_port);
    }
    // host:port — only split on the last colon when the port is numeric
    if let Some((h, p)) = host.rsplit_once(':') {
        if !h.is_empty() && p.parse::<u16>().is_ok() && !h.contains(':') {
            return (h.to_string(), p.parse().unwrap_or(default_port));
        }
    }
    (host.to_string(), default_port)
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn default_is_localhost() {
        let cfg = ClientConfig::default();
        assert_eq!(
            cfg.game_server_addr(),
            "127.0.0.1:7373".parse().unwrap()
        );
        assert_eq!(cfg.api_base_url(), "http://127.0.0.1:7380");
    }

    #[test]
    fn hud_view_roundtrips_in_config() {
        let mut cfg = ClientConfig::default();
        cfg.hud_view = Some("map".into());
        let json = serde_json::to_string(&cfg).unwrap();
        let loaded: ClientConfig = serde_json::from_str(&json).unwrap();
        assert_eq!(loaded.hud_view.as_deref(), Some("map"));
    }

    #[test]
    fn hud_and_workers_prefs_roundtrip() {
        let mut cfg = ClientConfig::default();
        cfg.hud_log_hidden = Some(true);
        cfg.workers_menu_compact = Some(true);
        cfg.worker_route_panel_collapsed = Some(true);
        let json = serde_json::to_string(&cfg).unwrap();
        let loaded: ClientConfig = serde_json::from_str(&json).unwrap();
        assert_eq!(loaded.hud_log_hidden, Some(true));
        assert_eq!(loaded.workers_menu_compact, Some(true));
        assert_eq!(loaded.worker_route_panel_collapsed, Some(true));
    }

    #[test]
    fn split_host_port_handles_dns_and_explicit_port() {
        assert_eq!(
            split_host_port("server1.flatland3.com", 7373),
            ("server1.flatland3.com".into(), 7373)
        );
        assert_eq!(
            split_host_port("server1.flatland3.com:7374", 7373),
            ("server1.flatland3.com".into(), 7374)
        );
        assert_eq!(
            split_host_port("127.0.0.1", 7373),
            ("127.0.0.1".into(), 7373)
        );
    }

    #[test]
    fn normalize_strips_scheme() {
        assert_eq!(
            normalize_host_input("https://server1.flatland3.com/").unwrap(),
            "server1.flatland3.com"
        );
    }

    #[test]
    fn api_base_uses_dns_host() {
        let mut cfg = ClientConfig::default();
        cfg.game_host = Some("server1.flatland3.com".into());
        assert_eq!(cfg.api_base_url(), "http://server1.flatland3.com:7380");
    }
}