// AnyBot's own browser window, like Grok Bot's own browser: a separate Chrome-family profile that
// AnyBot starts and talks to directly (Chrome's DevTools protocol on a local port), so reading
// and opening pages needs no browser setting ("允許來自 Apple 事件的 JavaScript") and no macOS
// "control this app" prompt. The person logs in to sites in this window once; the profile keeps it.
//
// Profiles (設定檔): the person's own Chrome profiles can't be used (macOS refuses other apps
// Chrome's data folder, and Chrome refuses remote control of its normal folder), so AnyBot's
// browser keeps its own: 「預設」 plus any the person or the bot adds (工作, 私人…). Each is its own
// browser folder and window with its own logins; switching picks which one the bot uses.

use serde_json::{json, Value};
use std::io::ErrorKind;
use std::net::{SocketAddr, TcpStream};
use std::path::PathBuf;
use std::process::{Command, Stdio};
use std::time::{Duration, Instant};

/// Local port for talking to the bot's browser (estimated; any free local port works).
pub const PORT: u16 = 9333;
/// How long to wait for the browser to come up (estimated).
const START_TIMEOUT_SECS: u64 = 20;
/// How long a page read may take (estimated).
const READ_TIMEOUT_SECS: u64 = 20;
/// The first profile: the browser folder made before profiles existed (its logins stay).
pub const DEFAULT_PROFILE: &str = "預設";
/// The person's own browser (read through accessibility, like Grok Bot's Computer Use helper):
/// whichever Chrome profile they have open there is the one read.
pub const PERSON_PROFILE: &str = "你的瀏覽器";
/// Other ways people name their own browser.
const PERSON_ALIASES: [&str; 6] = ["你的 chrome", "我的 chrome", "我的瀏覽器", "你的chrome", "我的chrome", "my chrome"];
/// Longest profile name (estimated).
pub const PROFILE_NAME_MAX_CHARS: usize = 30;
/// File Chrome writes into its folder with the port it chose (`--remote-debugging-port=0`).
const ACTIVE_PORT_FILE: &str = "DevToolsActivePort";

/// Chrome-family browsers that can be started as AnyBot's own window.
#[cfg(target_os = "macos")]
const CANDIDATES: &[(&str, &str)] = &[
    ("Google Chrome", "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome"),
    ("Brave Browser", "/Applications/Brave Browser.app/Contents/MacOS/Brave Browser"),
    ("Microsoft Edge", "/Applications/Microsoft Edge.app/Contents/MacOS/Microsoft Edge"),
    ("Chromium", "/Applications/Chromium.app/Contents/MacOS/Chromium"),
];
/// Linux: the usual install places (distribution packages, the vendors' .deb/.rpm, Snap, Flatpak).
#[cfg(not(target_os = "macos"))]
const CANDIDATES: &[(&str, &str)] = &[
    ("Google Chrome", "/usr/bin/google-chrome-stable"),
    ("Google Chrome", "/usr/bin/google-chrome"),
    ("Google Chrome", "/opt/google/chrome/chrome"),
    ("Brave Browser", "/usr/bin/brave-browser"),
    ("Brave Browser", "/opt/brave.com/brave/brave"),
    ("Microsoft Edge", "/usr/bin/microsoft-edge"),
    ("Chromium", "/usr/bin/chromium"),
    ("Chromium", "/usr/bin/chromium-browser"),
    ("Chromium", "/snap/bin/chromium"),
    ("Chromium", "/var/lib/flatpak/exports/bin/org.chromium.Chromium"),
];

pub fn engine() -> Option<(&'static str, &'static str)> {
    CANDIDATES.iter().copied().find(|(_, p)| std::path::Path::new(p).exists())
}

pub fn available() -> bool {
    if using_box() {
        return true;
    }
    engine().is_some()
}

fn data_dir() -> PathBuf {
    crate::model::State::path().parent().map(PathBuf::from).unwrap_or_else(std::env::temp_dir)
}

/// The 「預設」 profile lives with AnyBot's data (logins stay between runs).
pub fn profile_dir() -> PathBuf {
    data_dir().join("browser")
}

fn profiles_root() -> PathBuf {
    data_dir().join("browser-profiles")
}

fn dir_for(name: &str) -> PathBuf {
    if name == DEFAULT_PROFILE { profile_dir() } else { profiles_root().join(name) }
}

/// All profiles: 「預設」 first, then the added ones by name.
pub fn profiles() -> Vec<String> {
    let mut extra: Vec<String> = std::fs::read_dir(profiles_root())
        .map(|it| it.flatten().filter(|e| e.path().is_dir()).filter_map(|e| e.file_name().to_str().map(str::to_string)).collect())
        .unwrap_or_default();
    extra.sort();
    let mut all = vec![DEFAULT_PROFILE.to_string()];
    all.extend(extra.into_iter().filter(|n| n != DEFAULT_PROFILE));
    all
}

fn current_file() -> PathBuf {
    data_dir().join("browser-profile.txt")
}

/// Every choice: AnyBot's own profiles, then the person's own browser.
pub fn choices() -> Vec<String> {
    let mut all = profiles();
    // Reading the person's own browser goes through macOS accessibility; not on Linux.
    if cfg!(target_os = "macos") {
        all.push(PERSON_PROFILE.to_string());
    }
    all
}

/// The profile the bot uses when it isn't told which.
pub fn current() -> String {
    let want = std::fs::read_to_string(current_file()).unwrap_or_default().trim().to_string();
    match_profile(&choices(), &want).unwrap_or_else(|| DEFAULT_PROFILE.to_string())
}

pub fn set_current(name: &str) -> Result<String, String> {
    let name = resolve(Some(name))?;
    std::fs::write(current_file(), &name).map_err(|e| format!("存不了設定檔選擇：{e}"))?;
    Ok(name)
}

/// Find a profile by name, ignoring case and spaces at the ends.
pub fn match_profile(list: &[String], want: &str) -> Option<String> {
    let w = want.trim().to_lowercase();
    if w.is_empty() {
        return None;
    }
    if PERSON_ALIASES.contains(&w.as_str()) && list.iter().any(|n| n == PERSON_PROFILE) {
        return Some(PERSON_PROFILE.to_string());
    }
    list.iter().find(|n| n.to_lowercase() == w).cloned()
}

/// Which profile a tool call means: the one named, or the current one.
pub fn resolve(requested: Option<&str>) -> Result<String, String> {
    if using_box() {
        return Ok(DEFAULT_PROFILE.to_string());
    }
    match requested.map(str::trim).filter(|s| !s.is_empty()) {
        None => Ok(current()),
        Some(r) => {
            let all = choices();
            match_profile(&all, r).ok_or_else(|| format!("AnyBot 瀏覽器沒有叫「{r}」的設定檔。現有：{}。要新的可以用 browser_profiles 新增（action: add）。", all.join("、")))
        }
    }
}

/// A usable profile name: not empty, not too long, no slashes or dots-only names.
pub fn check_name(name: &str) -> Result<String, String> {
    let n = name.trim();
    if n.is_empty() {
        return Err("請給設定檔名稱".into());
    }
    if n.chars().count() > PROFILE_NAME_MAX_CHARS {
        return Err(format!("設定檔名稱最多 {PROFILE_NAME_MAX_CHARS} 個字"));
    }
    if n == PERSON_PROFILE || PERSON_ALIASES.contains(&n.to_lowercase().as_str()) {
        return Err(format!("「{n}」是留給你自己瀏覽器的名字，請換一個"));
    }
    if n.contains('/') || n.contains(':') || n.starts_with('.') || n.chars().any(char::is_control) {
        return Err("設定檔名稱不能有 / 或 : 也不能用 . 開頭".into());
    }
    Ok(n.to_string())
}

/// Make a new empty profile (its own folder, so its own logins).
pub fn add(name: &str) -> Result<String, String> {
    let n = check_name(name)?;
    if let Some(have) = match_profile(&profiles(), &n) {
        return Ok(have);
    }
    std::fs::create_dir_all(profiles_root().join(&n)).map_err(|e| format!("建不了設定檔：{e}"))?;
    Ok(n)
}

/// Remove an added profile and its logins (the person's choice, from Settings). 「預設」 and the
/// person's own browser can't be removed, and an open window must be closed first.
pub fn remove(name: &str) -> Result<(), String> {
    let all = profiles();
    let n = match_profile(&all, name).ok_or_else(|| format!("沒有叫「{name}」的設定檔"))?;
    if n == DEFAULT_PROFILE || n == PERSON_PROFILE {
        return Err(format!("「{n}」不能移除"));
    }
    if live_port(&n).is_some() {
        return Err(format!("「{n}」的視窗還開著，請先關掉它再移除。"));
    }
    let dir = profiles_root().join(&n);
    // Only ever a folder directly inside AnyBot's browser-profiles folder.
    if dir.parent() != Some(profiles_root().as_path()) {
        return Err("設定檔位置不對，沒有移除".into());
    }
    std::fs::remove_dir_all(&dir).map_err(|e| format!("移除不了「{n}」：{e}"))?;
    if current() == n || !choices().contains(&current()) {
        let _ = std::fs::write(current_file(), DEFAULT_PROFILE);
    }
    Ok(())
}

pub(crate) fn local() -> ureq::Agent {
    ureq::Agent::config_builder().timeout_global(Some(Duration::from_secs(5))).http_status_as_error(false).build().into()
}

/// The fixed port of 「預設」 (`ANYBOT_BROWSER_PORT` overrides it, for testing).
fn default_port() -> u16 {
    std::env::var("ANYBOT_BROWSER_PORT").ok().and_then(|p| p.parse().ok()).unwrap_or(PORT)
}

fn endpoint(port: u16, path: &str) -> String {
    format!("http://127.0.0.1:{port}{path}")
}

fn alive(port: u16) -> bool {
    port != 0 && local().get(&endpoint(port, "/json/version")).call().map(|r| r.status().as_u16() == 200).unwrap_or(false)
}

/// First line of Chrome's DevToolsActivePort file.
pub fn parse_active_port(text: &str) -> Option<u16> {
    text.lines().next()?.trim().parse().ok().filter(|p| *p != 0)
}

/// The port a running window of this profile answers on, if any.
fn live_port(name: &str) -> Option<u16> {
    let file = std::fs::read_to_string(dir_for(name).join(ACTIVE_PORT_FILE)).ok().and_then(|t| parse_active_port(&t));
    let fixed = (name == DEFAULT_PROFILE).then(default_port);
    [fixed, file].into_iter().flatten().find(|p| alive(*p))
}

/// Percent-encode a URL so it can ride in `/json/new?<url>`.
pub fn encode_component(s: &str) -> String {
    s.bytes()
        .map(|b| match b {
            b'A'..=b'Z' | b'a'..=b'z' | b'0'..=b'9' | b'-' | b'_' | b'.' | b'~' | b':' | b'/' => (b as char).to_string(),
            _ => format!("%{b:02X}"),
        })
        .collect()
}

thread_local! {
    /// Browser steps on this thread go to Bot 的電腦's Chromium (its box), not this computer's.
    static IN_BOX: std::cell::Cell<bool> = const { std::cell::Cell::new(false) };
}

/// Run `f` with the browser steps on Bot 的電腦's own Chromium.
pub fn in_box<T>(f: impl FnOnce() -> T) -> T {
    IN_BOX.with(|b| b.set(true));
    let r = f();
    IN_BOX.with(|b| b.set(false));
    r
}

pub fn using_box() -> bool {
    IN_BOX.with(|b| b.get())
}

/// Start this profile's window if it isn't running. Returns (browser name, port, just started).
pub fn ensure(profile: &str, first_url: Option<&str>) -> Result<(&'static str, u16, bool), String> {
    if using_box() {
        let fresh = !crate::cloudbox::browser_running();
        let port = crate::cloudbox::browser_port()?;
        if fresh {
            if let Some(u) = first_url {
                let _ = local().put(&endpoint(port, &format!("/json/new?{}", encode_component(u)))).send_empty();
            }
        }
        return Ok(("Bot 的電腦的 Chromium", port, fresh && first_url.is_some()));
    }
    let Some((name, bin)) = engine() else { return Err("這台電腦沒有 Chrome、Brave、Edge 或 Chromium，沒辦法開 AnyBot 自己的瀏覽器。".into()) };
    if profile == PERSON_PROFILE {
        return Err("「你的瀏覽器」是你自己的視窗，AnyBot 不會另外開。".into());
    }
    if let Some(p) = live_port(profile) {
        return Ok((name, p, false));
    }
    let dir = dir_for(profile);
    let _ = std::fs::create_dir_all(&dir);
    let _ = std::fs::remove_file(dir.join(ACTIVE_PORT_FILE));
    // 「預設」 keeps its fixed port; other profiles let Chrome pick a free one and read it back.
    let launch_port = if profile == DEFAULT_PROFILE { default_port() } else { 0 };
    // Defense in depth: this becomes a Chrome launch argument. Every caller normalizes to a
    // full URL first; a bare "-…" (a Chrome flag) must never get here from a tool argument.
    let url = match first_url {
        Some(u) if u.starts_with("http://") || u.starts_with("https://") => u,
        Some(_) => return Err("第一個網址必須是 http(s) 網址".into()),
        None => "about:blank",
    };
    let mut c = Command::new(bin);
    c.arg(format!("--user-data-dir={}", dir.display()))
        .arg(format!("--remote-debugging-port={launch_port}"))
        .arg("--remote-allow-origins=http://127.0.0.1")
        .arg("--no-first-run")
        .arg("--no-default-browser-check")
        .arg(url)
        .stdin(Stdio::null())
        .stdout(Stdio::null())
        .stderr(Stdio::null());
    #[cfg(unix)]
    {
        use std::os::unix::process::CommandExt;
        c.process_group(0);
    }
    c.spawn().map_err(|e| format!("打不開 {name}：{e}"))?;
    let start = Instant::now();
    while start.elapsed() < Duration::from_secs(START_TIMEOUT_SECS) {
        if let Some(p) = live_port(profile) {
            return Ok((name, p, true));
        }
        std::thread::sleep(Duration::from_millis(250));
    }
    Err(format!("{name} 沒有及時打開（AnyBot 瀏覽器，設定檔「{profile}」）。請再試一次。"))
}

/// Open a link in a new tab of the bot's browser (in the named profile, which becomes current).
pub fn open(url: &str, profile: Option<&str>) -> Result<String, String> {
    let prof = resolve(profile)?;
    let _ = set_current(&prof);
    let (name, port, fresh) = ensure(&prof, Some(url))?;
    if !fresh {
        let r = local().put(&endpoint(port, &format!("/json/new?{}", encode_component(url)))).send_empty().map_err(|e| e.to_string())?;
        if r.status().as_u16() >= 400 {
            return Err(format!("{name} 沒辦法開新分頁（{}）", r.status()));
        }
    }
    std::thread::sleep(Duration::from_secs(3));
    Ok(format!("已在 AnyBot 瀏覽器（{name}，設定檔「{prof}」）打開 {url}。接著用 browser_read 讀內容。如果頁面要登入，請使用者在那個視窗登入一次，之後會記住。"))
}

/// Bring a profile's window up (Settings button): start it, or bring its front tab forward.
pub fn show(profile: &str) -> Result<(), String> {
    let (_, port, fresh) = ensure(profile, None)?;
    if fresh {
        return Ok(());
    }
    let list: Value = local().get(&endpoint(port, "/json/list")).call().map_err(|e| e.to_string())?.into_body().read_json().map_err(|e| e.to_string())?;
    let id = list.as_array().and_then(|a| a.iter().find(|t| t["type"] == "page")).and_then(|t| t["id"].as_str()).map(str::to_string);
    match id {
        Some(id) => local().get(&endpoint(port, &format!("/json/activate/{id}"))).call().map(|_| ()).map_err(|e| e.to_string()),
        None => local().put(&endpoint(port, "/json/new?about:blank")).send_empty().map(|_| ()).map_err(|e| e.to_string()),
    }
}

/// The browser_profiles tool: list, add or switch profiles.
pub fn profiles_tool(action: &str, name: &str) -> Result<String, String> {
    let list_text = || {
        let cur = current();
        choices().iter().map(|p| if *p == cur { format!("{p}（使用中）") } else { p.clone() }).collect::<Vec<_>>().join("、")
    };
    match action.trim() {
        "" | "list" => Ok(format!("AnyBot 瀏覽器的設定檔：{}。每個設定檔有自己的登入。「{PERSON_PROFILE}」是使用者平常的瀏覽器：使用者在那裡切到哪個 Chrome 設定檔，就讀哪個。", list_text())),
        "add" | "create" => {
            let n = add(name)?;
            set_current(&n)?;
            Ok(format!("已新增並切換到設定檔「{n}」（全新的，還沒登入任何網站）。用 browser_open 打開網站後，請使用者在那個視窗登入一次。現在：{}", list_text()))
        }
        "use" | "switch" => {
            let n = set_current(name)?;
            let note = if n == PERSON_PROFILE { "（使用者平常的瀏覽器：請使用者在那裡切到想要的 Chrome 設定檔）" } else { "" };
            Ok(format!("已切換到「{n}」{note}，之後的 browser_open / browser_read 都用它。現在：{}", list_text()))
        }
        other => Err(format!("不懂「{other}」，action 請用 list、add 或 use")),
    }
}

/// The page to read: the first ordinary page tab (Chrome lists the most recent first).
pub fn pick_page(list: &Value) -> Option<(String, String, String)> {
    list.as_array()?.iter().find(|t| t["type"] == "page" && !t["url"].as_str().unwrap_or("").starts_with("devtools://")).map(|t| {
        (t["webSocketDebuggerUrl"].as_str().unwrap_or("").to_string(), t["title"].as_str().unwrap_or("").to_string(), t["url"].as_str().unwrap_or("").to_string())
    })
}

fn evaluate(port: u16, ws_url: &str, expression: &str) -> Result<Value, String> {
    let addr: SocketAddr = format!("127.0.0.1:{port}").parse().unwrap();
    let stream = TcpStream::connect_timeout(&addr, Duration::from_secs(5)).map_err(|e| e.to_string())?;
    stream.set_read_timeout(Some(Duration::from_secs(READ_TIMEOUT_SECS))).ok();
    let (mut ws, _) = tungstenite::client::client(ws_url, stream).map_err(|e| format!("連不上 AnyBot 瀏覽器：{e}"))?;
    let msg = json!({"id": 1, "method": "Runtime.evaluate", "params": {"expression": expression, "returnByValue": true, "awaitPromise": true}});
    ws.send(tungstenite::Message::Text(msg.to_string().into())).map_err(|e| e.to_string())?;
    let start = Instant::now();
    loop {
        if start.elapsed() > Duration::from_secs(READ_TIMEOUT_SECS) {
            return Err("讀取頁面太久了".into());
        }
        match ws.read() {
            Ok(tungstenite::Message::Text(t)) => {
                let v: Value = serde_json::from_str(t.as_str()).unwrap_or(Value::Null);
                if v["id"] == 1 {
                    let _ = ws.close(None);
                    if let Some(e) = v.get("error") {
                        return Err(format!("頁面拒絕讀取：{e}"));
                    }
                    return Ok(v["result"]["result"]["value"].clone());
                }
            }
            Ok(_) => {}
            Err(tungstenite::Error::Io(e)) if e.kind() == ErrorKind::WouldBlock || e.kind() == ErrorKind::TimedOut => return Err("讀取頁面太久了".into()),
            Err(e) => return Err(e.to_string()),
        }
    }
}

/// Run JavaScript in the current tab of the bot's browser. Returns (address, result).
pub fn eval_current(profile: Option<&str>, expression: &str) -> Result<(String, Value), String> {
    let prof = resolve(profile)?;
    let (_, port, _) = ensure(&prof, None)?;
    let list: Value = local().get(&endpoint(port, "/json/list")).call().map_err(|e| e.to_string())?.into_body().read_json().map_err(|e| e.to_string())?;
    let Some((ws_url, _, url)) = pick_page(&list) else { return Err("AnyBot 瀏覽器沒有開著的分頁，請先用 browser_open 打開登入頁。".into()) };
    let v = evaluate(port, &ws_url, expression)?;
    Ok((url, v))
}

const READ_EXPR: &str = "JSON.stringify({t:document.title,u:location.href,x:document.body?document.body.innerText:''})";

/// Title, address and visible text of the current tab of the bot's browser.
pub fn read(max_chars: usize, profile: Option<&str>) -> Result<String, String> {
    let prof = resolve(profile)?;
    let (name, port, _) = ensure(&prof, None)?;
    let list: Value = local().get(&endpoint(port, "/json/list")).call().map_err(|e| e.to_string())?.into_body().read_json().map_err(|e| e.to_string())?;
    let Some((ws_url, title, url)) = pick_page(&list) else { return Err("AnyBot 瀏覽器沒有開著的分頁，請先用 browser_open 打開網址。".into()) };
    let v = evaluate(port, &ws_url, READ_EXPR)?;
    let page: Value = v.as_str().and_then(|s| serde_json::from_str(s).ok()).unwrap_or(Value::Null);
    let text: String = page["x"].as_str().unwrap_or("").lines().map(str::trim).filter(|l| !l.is_empty()).collect::<Vec<_>>().join("\n");
    let title = page["t"].as_str().map(str::to_string).unwrap_or(title);
    let url = page["u"].as_str().map(str::to_string).unwrap_or(url);
    let mut clipped: String = text.chars().take(max_chars).collect();
    if text.chars().count() > max_chars {
        clipped.push_str("\n…（後面還有，已截斷）");
    }
    let login_hint = {
        let l = clipped.to_lowercase();
        (l.contains("log in") || l.contains("sign in") || clipped.contains("登入")) && clipped.chars().count() < 1500
    };
    let mut out = format!("瀏覽器：AnyBot 瀏覽器（{name}，設定檔「{prof}」）\n標題：{title}\n網址：{url}\n\n{clipped}");
    // The links, buttons and fields, numbered for browser_click / browser_type / browser_select.
    if let Ok((_, _, list, _)) = crate::browser::Tab::current(Some(&prof)).and_then(|mut t| crate::browser::elements(&mut t)) {
        if !list.is_empty() {
            out.push_str("\n\n可以操作的元素（用 browser_click、browser_type、browser_select 等工具的 ref；連結的網址在 → 後面，不要自己猜網址；看不懂時用 browser_screenshot）：\n");
            out.push_str(&list.join("\n"));
        }
    }
    if login_hint {
        out.push_str("\n\n（這頁看起來要登入。請使用者在 AnyBot 瀏覽器視窗登入一次，之後就會記住。）");
    }
    Ok(out)
}

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

    /// Live check against a running Chrome on ANYBOT_BROWSER_PORT (run by hand with --ignored).
    #[test]
    #[ignore]
    fn reads_a_real_page() {
        let r = open("https://example.com", None).unwrap();
        assert!(r.contains("example.com"), "{r}");
        let page = read(2000, None).unwrap();
        assert!(page.contains("Example Domain"), "{page}");
        println!("{page}");
    }

    #[test]
    fn urls_are_encoded_for_new_tabs() {
        assert_eq!(encode_component("https://www.threads.net/@me?x=1&y=2"), "https://www.threads.net/%40me%3Fx%3D1%26y%3D2");
    }

    #[test]
    fn first_real_page_is_read() {
        let list = serde_json::json!([
            {"type": "service_worker", "url": "https://x", "webSocketDebuggerUrl": "ws://a"},
            {"type": "page", "url": "devtools://devtools", "webSocketDebuggerUrl": "ws://b"},
            {"type": "page", "url": "https://www.threads.net/", "title": "Threads", "webSocketDebuggerUrl": "ws://c"}
        ]);
        assert_eq!(pick_page(&list).unwrap(), ("ws://c".to_string(), "Threads".to_string(), "https://www.threads.net/".to_string()));
    }

    #[test]
    fn profiles_are_found_by_name() {
        let list = vec![DEFAULT_PROFILE.to_string(), "工作".to_string(), "Personal".to_string()];
        assert_eq!(match_profile(&list, " personal ").as_deref(), Some("Personal"));
        assert_eq!(match_profile(&list, "工作").as_deref(), Some("工作"));
        assert_eq!(match_profile(&list, "私人"), None);
        assert_eq!(match_profile(&list, ""), None);
        let with_person = vec![DEFAULT_PROFILE.to_string(), PERSON_PROFILE.to_string()];
        assert_eq!(match_profile(&with_person, "我的 Chrome").as_deref(), Some(PERSON_PROFILE));
        assert_eq!(match_profile(&list, "我的 Chrome"), None);
        assert!(check_name("我的 Chrome").is_err());
        assert!(check_name(PERSON_PROFILE).is_err());
    }

    #[test]
    fn profile_names_are_checked() {
        assert_eq!(check_name(" 工作 ").unwrap(), "工作");
        assert!(check_name("").is_err());
        assert!(check_name("a/b").is_err());
        assert!(check_name("..").is_err());
        assert!(check_name(&"字".repeat(PROFILE_NAME_MAX_CHARS + 1)).is_err());
        assert!(check_name(&"字".repeat(PROFILE_NAME_MAX_CHARS)).is_ok());
    }

    #[test]
    fn chosen_port_is_read_back() {
        assert_eq!(parse_active_port("53211\n/devtools/browser/abc\n"), Some(53211));
        assert_eq!(parse_active_port("0\n"), None);
        assert_eq!(parse_active_port(""), None);
    }

}