/**
 * @file Unit tests for typing `/reload-plugins` / `/reload-skills` into the
 * live Claude Code lane panes. Uses tmux.js's exec seam, so no real tmux binary
 * is invoked and no real session is ever typed into.
 *
 * The behaviours worth locking down are the ones that would silently do the
 * wrong thing: sending to a pane sitting at a shell prompt (the slash command
 * would run as a shell command instead), forwarding a caller-supplied string
 * into a REPL, and letting one dead pane fail the whole batch. The `tool ===
 * "claude"` filter is not covered here — it reads a dashboard-runs DB row,
 * which these stubs do not populate.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

const { describe, it, beforeEach, after } = require("node:test");
const assert = require("node:assert/strict");
const path = require("node:path");
const fs = require("node:fs");
const os = require("node:os");

const TMP = fs.mkdtempSync(path.join(os.tmpdir(), "cc-reload-test-"));
process.env.DASHBOARD_DB_PATH = path.join(TMP, "dashboard.db");

const tmux = require("../lib/tmux");
const { reloadOpenSessions, reloadableLanes } = require("../lib/cc-reload");

after(() => {
  try {
    fs.rmSync(TMP, { recursive: true, force: true, maxRetries: 5, retryDelay: 100 });
  } catch {
    /* best effort */
  }
});

/**
 * Stub tmux so `listRuns()` sees `sessions` and each pane reports the command
 * given in `panes` (defaulting to a live `claude`).
 * @returns {any[][]} the recorded argv arrays
 */
function stubTmux(sessions, panes = {}) {
  const calls = [];
  tmux.__setExecImpl((args) => {
    calls.push(args);
    if (args[0] === "list-sessions") return sessions.join("\n");
    if (args[0] === "has-session") {
      if (sessions.includes(args[2].slice(1))) return "";
      const e = new Error("no such session");
      e.status = 1;
      throw e;
    }
    if (args[0] === "display-message") {
      const name = args[3].slice(1, -1);
      const cmd = panes[name] ?? "claude";
      if (cmd === null) {
        const e = new Error("pane gone");
        e.status = 1;
        throw e;
      }
      return `${cmd}\n`;
    }
    if (args[0] === "send-keys") {
      if (panes[args[2].slice(1, -1)] === "__send-fails__") throw new Error("pane died mid-send");
      return "";
    }
    return "";
  });
  return calls;
}

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

  it("lists a lane whose pane is running claude", () => {
    stubTmux(["agenthub-lane-1"]);
    const lanes = reloadableLanes();
    assert.equal(lanes.length, 1);
    assert.equal(lanes[0].id, "agenthub-lane-1");
    assert.equal(lanes[0].laneId, 1);
  });

  it("skips a pane sitting at a shell prompt", () => {
    // The claude process there has exited, so `/reload-plugins` would be typed
    // at a bash prompt and run as a shell command instead.
    stubTmux(["agenthub-lane-1"], { "agenthub-lane-1": "bash" });
    assert.deepEqual(reloadableLanes(), []);
  });

  it("skips every shell name, not just bash", () => {
    stubTmux(["agenthub-lane-1", "agenthub-lane-2", "agenthub-lane-3"], {
      "agenthub-lane-1": "zsh",
      "agenthub-lane-2": "fish",
      "agenthub-lane-3": "dash",
    });
    assert.deepEqual(reloadableLanes(), []);
  });

  it("returns nothing when no lane sessions exist at all", () => {
    stubTmux([]);
    assert.deepEqual(reloadableLanes(), []);
  });
});

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

  it("types both reload commands, plugins before skills", async () => {
    // Order matters: a skill shipped BY a plugin only exists on disk once the
    // plugin itself has been reloaded.
    const calls = stubTmux(["agenthub-lane-7"]);
    const out = await reloadOpenSessions({ settleMs: 0 });

    assert.deepEqual(out.commands, ["/reload-plugins", "/reload-skills"]);
    assert.equal(out.lanes_total, 1);
    assert.deepEqual(out.lanes[0].sent, ["/reload-plugins", "/reload-skills"]);

    const typed = calls.filter((c) => c[0] === "send-keys" && c[3] === "-l").map((c) => c[4]);
    assert.deepEqual(typed, ["/reload-plugins", "/reload-skills"]);
    // Each command must be submitted, or it just sits in the input box.
    assert.equal(calls.filter((c) => c[0] === "send-keys" && c[3] === "Enter").length, 2);
  });

  it("waits between the two commands so they cannot share one composer line", async () => {
    // Without the pause the first Enter lands on Claude Code's slash-command
    // menu, the second command is appended to the line still in the composer,
    // and the pane submits `/reload-plugins/reload-skills` as a prompt — the
    // reported bug. Timing is the behaviour, so timing is what is asserted.
    const calls = stubTmux(["agenthub-lane-1"]);
    const at = [];
    const typed = () => calls.filter((c) => c[0] === "send-keys" && c[3] === "-l").length;
    const before = typed();
    const started = Date.now();
    const done = reloadOpenSessions({ settleMs: 40 });
    at.push(typed() - before);
    await done;

    assert.equal(at[0], 1, "only the first command is typed before the wait");
    assert.ok(Date.now() - started >= 35, "the second command waited for the first to submit");
  });

  it("honours a narrowed kinds list", async () => {
    const calls = stubTmux(["agenthub-lane-1"]);
    const out = await reloadOpenSessions({ kinds: ["skills"], settleMs: 0 });
    assert.deepEqual(out.commands, ["/reload-skills"]);
    const typed = calls.filter((c) => c[0] === "send-keys" && c[3] === "-l").map((c) => c[4]);
    assert.deepEqual(typed, ["/reload-skills"]);
  });

  it("ignores an unknown kind rather than typing it into a REPL", async () => {
    // The command set is fixed in the module; a pane's stdin is not a place to
    // forward caller-supplied strings.
    const calls = stubTmux(["agenthub-lane-1"]);
    const out = await reloadOpenSessions({ kinds: ["plugins", "rm -rf /"], settleMs: 0 });
    assert.deepEqual(out.commands, ["/reload-plugins"]);
    const typed = calls.filter((c) => c[0] === "send-keys" && c[3] === "-l").map((c) => c[4]);
    assert.deepEqual(typed, ["/reload-plugins"]);
  });

  it("types into several lanes in one call", async () => {
    stubTmux(["agenthub-lane-1", "agenthub-lane-2"]);
    const out = await reloadOpenSessions({ settleMs: 0 });
    assert.equal(out.lanes_total, 2);
    assert.deepEqual(
      out.lanes.map((l) => l.laneId).sort((a, b) => a - b),
      [1, 2]
    );
  });

  it("records a pane that dies mid-send without failing the others", async () => {
    stubTmux(["agenthub-lane-1", "agenthub-lane-2"], { "agenthub-lane-1": "__send-fails__" });
    const out = await reloadOpenSessions({ settleMs: 0 });
    const failed = out.lanes.find((l) => l.id === "agenthub-lane-1");
    const ok = out.lanes.find((l) => l.id === "agenthub-lane-2");
    assert.match(failed.error, /died mid-send/);
    assert.deepEqual(failed.sent, [], "nothing was delivered to the dead pane");
    assert.deepEqual(ok.sent, ["/reload-plugins", "/reload-skills"]);
    assert.equal(ok.error, undefined);
  });

  it("reports an empty result instead of throwing when nothing is open", async () => {
    stubTmux([]);
    const out = await reloadOpenSessions({ settleMs: 0 });
    assert.equal(out.lanes_total, 0);
    assert.deepEqual(out.lanes, []);
  });
});