/**
 * @file tmux.test.js
 * @description Unit tests for the tmux command wrapper. Injects a fake exec
 * implementation so the suite never shells out to a real `tmux` binary (CI
 * has none installed).
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */
const { describe, it, beforeEach } = require("node:test");
const assert = require("node:assert/strict");
const tmux = require("../lib/tmux");

describe("tmux wrapper", () => {
  beforeEach(() => {
    tmux.__reset();
  });

  it("hasSession returns true when execFileSync exits 0", () => {
    tmux.__setExecImpl(() => "");
    assert.equal(tmux.hasSession("agenthub-lane-1"), true);
  });

  it("hasSession returns false when execFileSync throws", () => {
    tmux.__setExecImpl(() => {
      const e = new Error("no such session");
      e.status = 1;
      throw e;
    });
    assert.equal(tmux.hasSession("agenthub-lane-1"), false);
  });

  it("newSession builds the correct argv", () => {
    const calls = [];
    tmux.__setExecImpl((args) => {
      calls.push(args);
      return "";
    });
    tmux.newSession({
      name: "agenthub-lane-1",
      cwd: "/tmp/repo",
      argv: ["claude", "--model", "opus"],
    });
    assert.deepEqual(calls[0], [
      "new-session",
      "-d",
      "-s",
      "agenthub-lane-1",
      "-c",
      "/tmp/repo",
      "--",
      "claude",
      "--model",
      "opus",
    ]);
    assert.deepEqual(calls[1], ["set-option", "-t", "=agenthub-lane-1:", "mouse", "on"]);
    assert.deepEqual(calls[2], ["set-option", "-t", "=agenthub-lane-1:", "status", "off"]);
    assert.deepEqual(calls[3], ["set-option", "-t", "=agenthub-lane-1:", "pane-scrollbars", "on"]);
    assert.deepEqual(calls[4], [
      "set-option",
      "-t",
      "=agenthub-lane-1:",
      "pane-scrollbars-style",
      "fg=brightwhite,bg=black,width=2,pad=0",
    ]);
  });

  it("newSession still succeeds on a tmux older than 3.7 (no pane-scrollbars)", () => {
    tmux.__setExecImpl((args) => {
      if (args.includes("pane-scrollbars")) throw new Error("invalid option: pane-scrollbars");
      return "";
    });
    assert.doesNotThrow(() =>
      tmux.newSession({ name: "agenthub-lane-1", cwd: "/tmp/repo", argv: ["claude"] })
    );
  });

  it("sendText types the literal string and presses Enter, with no quoting", () => {
    const calls = [];
    tmux.__setExecImpl((args) => {
      calls.push(args);
      return "";
    });
    tmux.sendText("agenthub-lane-1", 'Reminder: run "agenthub stage implement"');
    assert.deepEqual(calls[0], [
      "send-keys",
      "-t",
      "=agenthub-lane-1:",
      "-l",
      'Reminder: run "agenthub stage implement"',
    ]);
    assert.deepEqual(calls[1], ["send-keys", "-t", "=agenthub-lane-1:", "Enter"]);
  });

  it("targets a session exactly, so lane 1 never resolves to lane 12 by prefix", () => {
    const calls = [];
    tmux.__setExecImpl((args) => {
      calls.push(args);
      return "";
    });
    tmux.hasSession("agenthub-lane-1");
    tmux.killSession("agenthub-lane-1");
    assert.deepEqual(calls, [
      ["has-session", "-t", "=agenthub-lane-1"],
      ["kill-session", "-t", "=agenthub-lane-1"],
    ]);
  });

  it("killSession never throws when the session is already gone", () => {
    tmux.__setExecImpl(() => {
      const e = new Error("no such session");
      e.status = 1;
      throw e;
    });
    assert.doesNotThrow(() => tmux.killSession("agenthub-lane-1"));
  });

  it("listSessions filters by prefix and ignores unrelated sessions", () => {
    tmux.__setExecImpl(() => "agenthub-lane-1\nagenthub-lane-2\nsome-other-session\n");
    assert.deepEqual(tmux.listSessions("agenthub-lane-"), ["agenthub-lane-1", "agenthub-lane-2"]);
  });

  it("listSessions returns [] when tmux has no sessions at all (exit 1)", () => {
    tmux.__setExecImpl(() => {
      const e = new Error("no server running");
      e.status = 1;
      throw e;
    });
    assert.deepEqual(tmux.listSessions("agenthub-lane-"), []);
  });

  it("isTmuxAvailable reflects whether the binary resolves on PATH", () => {
    tmux.__setExecImpl(() => "tmux 3.4");
    assert.equal(tmux.isTmuxAvailable(), true);
    tmux.__setExecImpl(() => {
      throw new Error("ENOENT");
    });
    assert.equal(tmux.isTmuxAvailable(), false);
  });
});