/**
 * Terminal capability detection via environment variables.
 *
 * Computed once at import time — terminal capabilities don't change mid-session.
 * No async queries (DECRQM, DA) needed; env vars cover the common terminals.
 */

const env = process.env;
const termProgram = env.TERM_PROGRAM ?? "";
const termVar = env.TERM ?? "";

/** Detected terminal capabilities. */

// --- Shared terminal sets ---

const SYNC_TERM_PROGRAMS = new Set(["iTerm.app", "WezTerm", "WarpTerminal", "ghostty", "contour", "vscode", "alacritty", "zed"]);
const TRUECOLOR_TERM_PROGRAMS = new Set(["iTerm.app", "WezTerm", "WarpTerminal", "ghostty", "vscode", "alacritty", "Hyper", "zed"]);
const HYPERLINK_TERM_PROGRAMS = new Set(["iTerm.app", "WezTerm", "ghostty", "alacritty", "Hyper", "vscode", "zed"]);
const KITTY_KEYBOARD_TERM_PROGRAMS = new Set(["iTerm.app", "WezTerm", "ghostty", "zed"]);
const KITTY_TERM_VARS = new Set(["kitty", "xterm-ghostty", "foot", "alacritty"]);
function getVteVersion() {
  const raw = env.VTE_VERSION;
  if (!raw) return 0;
  const v = Number.parseInt(raw, 10);
  return Number.isNaN(v) ? 0 : v;
}
function isKittyEnv() {
  return !!env.KITTY_WINDOW_ID;
}

// --- Detectors ---

function detectTerminal() {
  if (env.TERM_PROGRAM) return env.TERM_PROGRAM;
  if (env.KITTY_WINDOW_ID) return "kitty";
  if (env.WT_SESSION) return "windows-terminal";
  if (env.ZED_TERM) return "zed";
  if (env.TERM) return env.TERM;
  return "unknown";
}
function detectSyncOutput() {
  if (env.TMUX) return false;
  if (SYNC_TERM_PROGRAMS.has(termProgram)) return true;
  if (KITTY_TERM_VARS.has(termVar)) return true;
  if (isKittyEnv()) return true;
  if (env.ZED_TERM) return true;
  if (env.WT_SESSION) return true;
  if (getVteVersion() >= 6800) return true;
  return false;
}
function detectTrueColor() {
  if (env.COLORTERM === "truecolor" || env.COLORTERM === "24bit") return true;
  if (TRUECOLOR_TERM_PROGRAMS.has(termProgram)) return true;
  if (KITTY_TERM_VARS.has(termVar)) return true;
  if (isKittyEnv()) return true;
  if (env.WT_SESSION) return true;
  return false;
}
function detectKittyKeyboard() {
  if (KITTY_KEYBOARD_TERM_PROGRAMS.has(termProgram)) return true;
  if (KITTY_TERM_VARS.has(termVar)) return true;
  if (isKittyEnv()) return true;
  if (env.TMUX) return true;
  return false;
}
function detectHyperlinks() {
  if (env.TMUX) return false;
  if (HYPERLINK_TERM_PROGRAMS.has(termProgram)) return true;
  if (KITTY_TERM_VARS.has(termVar)) return true;
  if (isKittyEnv()) return true;
  if (env.WT_SESSION) return true;
  if (getVteVersion() >= 5000) return true;
  return false;
}
function detectMouse() {
  return process.stdout.isTTY === true;
}

/** Cached terminal capabilities — computed once at import time. */
export const terminalCaps = {
  terminal: detectTerminal(),
  syncOutput: detectSyncOutput(),
  trueColor: detectTrueColor(),
  kittyKeyboard: detectKittyKeyboard(),
  hyperlinks: detectHyperlinks(),
  mouse: detectMouse()
};
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