import { describe, expect, it } from "vitest";
import {
  TerminalLocalEcho,
  resolveLocalEchoMode,
} from "../../../src/frontend/lib/terminal-local-echo";

describe("TerminalLocalEcho", () => {
  it("renders immediately and suppresses the matching remote echo", () => {
    const echo = new TerminalLocalEcho("on");
    expect(echo.handleInput("a")).toBe("a");
    expect(echo.handleOutput("a")).toBe("");
  });

  it("rolls back a prediction when remote output differs", () => {
    const echo = new TerminalLocalEcho("on");
    echo.handleInput("a");
    expect(echo.handleOutput("z")).toBe("\x1b[1D\x1b[1Xz");
  });

  it("only erases the predicted cells during rollback", () => {
    const echo = new TerminalLocalEcho("on");
    echo.handleInput("a");
    echo.handleInput("b");
    expect(echo.handleOutput("\x1b[C")).toBe("\x1b[2D\x1b[2X\x1b[C");
  });

  it.each([
    ["split prompt", ["Pass", "word: "]],
    ["sudo prompt", ["[sudo] password for alice: "]],
    ["ssh-keygen prompt", ["Enter passphrase (empty for no passphrase): "]],
    ["passwd prompt", ["New password: "]],
  ])("does not expose input after a %s", (_name, chunks) => {
    const echo = new TerminalLocalEcho("on");
    for (const chunk of chunks) expect(echo.handleOutput(chunk)).toBe(chunk);
    expect(echo.handleInput("s")).toBe("");
  });

  it("does not treat ordinary password text as a hidden-input prompt", () => {
    const echo = new TerminalLocalEcho("on");
    expect(echo.handleOutput("Your password has expired\r\n$ ")).toBe(
      "Your password has expired\r\n$ ",
    );
    expect(echo.handleInput("s")).toBe("s");
  });

  it("does not predict control input, paste, or wide characters", () => {
    const echo = new TerminalLocalEcho("on");
    expect(echo.handleInput("\t")).toBe("");
    expect(echo.handleInput("paste")).toBe("");
    expect(echo.handleInput("界")).toBe("");
  });

  it("enables automatic prediction after repeated slow echoes", () => {
    let now = 0;
    const echo = new TerminalLocalEcho("auto", () => now, 100);
    expect(echo.handleInput("a")).toBe("");
    now = 150;
    expect(echo.handleOutput("a")).toBe("a");
    expect(echo.handleInput("b")).toBe("");
    now = 300;
    expect(echo.handleOutput("b")).toBe("b");
    expect(echo.handleInput("c")).toBe("c");
  });

  it("uses an explicit host mode before the global mode", () => {
    expect(resolveLocalEchoMode("off", "on")).toBe("off");
    expect(resolveLocalEchoMode("default", "on")).toBe("on");
    expect(resolveLocalEchoMode(undefined, null)).toBe("auto");
  });
});