import { NOTIFY_ENV } from "./constants.ts";
import { sendCmuxNotification, isInsideTmux, isInsideZellij, wrapTmuxPassthrough } from "./mux.ts";
import { normalizeNotification, NotifyProtocol, type NotificationInput } from "./notify-protocol.ts";
import { sendDesktopNotification } from "./desktop-notify.ts";
import { formatNotification } from "./osc99.ts";
import { detectTerminal, type TerminalCapabilities } from "./terminal-detect.ts";
import { createRuntime, type Runtime } from "./runtime.ts";

export interface SendOptions {
  runtime?: Runtime;
  terminal?: TerminalCapabilities;
}

function globallySuppressed(runtime: Runtime): boolean {
  return runtime.env[NOTIFY_ENV.global] !== undefined && /^(?:off|0|false)$/iu.test(runtime.env[NOTIFY_ENV.global]!.trim());
}

export function isNotificationSuppressed(runtime: Runtime = createRuntime()): boolean {
  return globallySuppressed(runtime);
}

function richOsc99(runtime: Runtime): boolean {
  return runtime.env[NOTIFY_ENV.osc99Rich]?.trim() === "1";
}

export function sendNotification(input: unknown, options: SendOptions = {}): void {
  const runtime = options.runtime ?? createRuntime();
  try {
    if (isNotificationSuppressed(runtime) || !runtime.stdoutIsTTY) return;
    const notification = normalizeNotification(input);
    if (!notification) return;
    if (sendCmuxNotification(notification, runtime)) return;

    const terminal = options.terminal ?? detectTerminal(runtime.env, undefined, () => runtime.readFileSync("/proc/version"));
    const formatted = formatNotification(notification, terminal.protocol, richOsc99(runtime));
    let output = formatted;
    if (terminal.protocol !== NotifyProtocol.Bell && terminal.insideTmux) output = `${wrapTmuxPassthrough(formatted)}\x07`;
    else if (terminal.protocol !== NotifyProtocol.Bell && terminal.insideZellij) output = `${formatted}\x07`;
    runtime.writeStdout(output);

    if (terminal.protocol === NotifyProtocol.Bell) sendDesktopNotification(notification, runtime, terminal.protocol);
  } catch {
    // Notification delivery is strictly best-effort.
  }
}