export class OxAlphaReplySource {

  readonly model: string;

  /**

   * The server records one conversation per account, so a turn submitted here

   * lands in the same conversation `/chat` writes to and every earlier

   * `openagents coder` run wrote to. That is why the model remembers a

   * question this terminal never asked, and there is nothing else on screen

   * that would tell a reader so. The Thread work replaces this; until a thread

   * exists the interface must not imply the session is private to this

   * terminal.

   */

  readonly scopeNotice =

    "This conversation is the account's one conversation, shared with /chat " +

    "and with earlier coder runs, so the model remembers turns from all of them.";

  constructor(private readonly options: OxAlphaOptions) {

    this.model = options.model ?? "stealth/ox-alpha";

  }

    }

  };

  // Where the turns are recorded is a property of the session, not of the

  // interface, so the piped path says it too rather than leaving it to the

  // one reader who happens to be on a TTY.

  const scope = session.snapshot().scope;

  if (scope !== undefined) stdout.write(`${scope}\n`);

  const unsubscribe = session.onChange(flush);

  flush();

  readonly repository: string;

  readonly branch: string;

  readonly model: string;

  /** Replies produced this session, shown where a real grant shows call count. */

  /**

   * Turns this process has submitted, counted from the moment one starts.

   *

   * A turn in flight is counted, because a status line that reads `0` under a

   * visibly streaming reply contradicts what the reader can see. The number is

   * deliberately about this process and nothing else, and the renderer says so:

   * the source may be writing into a conversation that already holds turns

   * this process never saw.

   */

  readonly turns: number;

  /**

   * What a reader needs to know about where this source records its turns, or

   * undefined when there is nothing to say. Shown once, at the start.

   */

  readonly scope: string | undefined;

}

/** Where reply chunks come from. One implementation today; ACP is the next. */

export interface ReplySource {

  /** The label the status line shows for the reply source. */

  readonly model: string;

  /**

   * One sentence about where this source's turns are recorded, shown once at

   * the start of a session. A source whose turns are private to this process

   * leaves it unset; a source that writes into a conversation shared with

   * another surface has to say so, because nothing else on screen would.

   */

  readonly scopeNotice?: string;

  /**

   * Yield the reply to `prompt` in chunks. Rendering appends each chunk as it

   * arrives, so a slow source shows partial text rather than nothing.

      branch: this.branch,

      model: this.source.model,

      turns: this.turnCount,

      scope: this.source.scopeNotice,

    };

  }

    const controller = new AbortController();

    this.controller = controller;

    // Counted here rather than on completion. A turn that is happening is a

    // turn, and counting it only once it settled is what made the status line

    // read `0 replies` under a reply the reader was watching arrive.

    this.turnCount += 1;

    this.emit();

    try {

        if (entry.tool?.status === "running") entry.tool.status = "failed";

      }

      this.controller = undefined;

      this.turnCount += 1;

      this.emit();

    }

  }

  return left + " ".repeat(width - used) + right;

}

/**

 * Lay out the key hints against the counter, dropping hints from the end until

 * the row fits.

 *

 * The counter is state the reader is trying to read; the hints are reminders

 * of keys that work whether or not they are printed. So the hints are what

 * gives way. Padding the two apart and dropping the counter instead is how a

 * wide-enough terminal still managed to hide the reply count.

 */

function hints(keys: ReadonlyArray<string>, right: string, width: number): string {

  for (let count = keys.length; count > 0; count -= 1) {

    const left = `${DIM}${keys.slice(0, count).join(" · ")}${RESET}`;

    if (visibleWidth(left) + visibleWidth(right) + 2 <= width) return justify(left, right, width);

  }

  return right;

}

/** Human-readable elapsed time, in the shape a status line wants. */

function elapsed(sinceMs: number, nowMs: number): string {

  const seconds = Math.max(0, Math.round((nowMs - sinceMs) / 1000));

      rows.push(`  › ${composer}`);

      rows.push(rule);

      // Every key named here does something in the state it is named in. An

      // earlier version offered "esc esc to interrupt" while idle, where there

      // was nothing to interrupt.

      // Every key named here does something in the state it is named in, and

      // they are listed in the order a reader needs them, because a narrow row

      // drops them from the end. An earlier version offered "esc esc to

      // interrupt" while idle, where there was nothing to interrupt.

      const keys: string[] = [];

      if (snapshot.running) {

        keys.push("esc to interrupt", "ctrl+c to stop");

      if (lines.length > transcriptHeight) keys.push("pgup/pgdn to scroll");

      if (focusedTool(snapshot) !== undefined) keys.push("ctrl+o to expand");

      // `this run` is not decoration. The count is this process's, and the

      // source may be writing into a conversation that already holds turns

      // from `/chat` and from earlier runs, so an unlabelled number would read

      // as the conversation's and contradict what the model remembers.

      const replies = `${snapshot.turns} ${snapshot.turns === 1 ? "reply" : "replies"} this run`;

      const counter =

        anchor !== undefined

          ? `${YELLOW}scrolled${RESET}${DIM} · ↑${above} · ↓${below}${RESET}`

          : above > 0

            ? `${DIM}↑${above} above · ${snapshot.turns} ${snapshot.turns === 1 ? "reply" : "replies"}${RESET}`

            : `${DIM}${snapshot.turns} ${snapshot.turns === 1 ? "reply" : "replies"}${RESET}`;

      rows.push(`  ${justify(`${DIM}${keys.join(" · ")}${RESET}`, counter, inner)}`);

            ? `${DIM}↑${above} above · ${replies}${RESET}`

            : `${DIM}${replies}${RESET}`;

      rows.push(`  ${hints(keys, counter, inner)}`);

      paint(rows, transcriptHeight + 3, 4 + composer.length + 1);

    };

      "openagents coder — development build. Type a message and press enter. " +

        "Ctrl+D quits, Esc interrupts a reply.",

    );

    const scope = session.snapshot().scope;

    if (scope !== undefined) session.notice(scope);

    render();

  });

}

  it("reports the model it runs on", () => {

    expect(source().model).toBe("stealth/ox-alpha");

  });

  it("says that its turns land in the account's one shared conversation", () => {

    // The server records one conversation per account, so this source cannot

    // let the interface imply the session is private to one terminal.

    expect(source().scopeNotice).toContain("/chat");

    expect(source().scopeNotice).toContain("remembers");

  });

});

    expect(again?.tool?.output).toBeUndefined();

  });

  it("counts the turn while it is streaming rather than only once it settles", async () => {

    const session = new CoderSession(scripted(["a", "b", "c"], 15), "repo", "main");

    const seen: number[] = [];

    session.onChange(() => {

      if (session.snapshot().running) seen.push(session.snapshot().turns);

    });

    await session.submit("go");

    // A reply the reader can watch arrive is a turn that has happened.

    expect(seen.length).toBeGreaterThan(0);

    expect(seen.every((turns) => turns === 1)).toBe(true);

    expect(session.snapshot().turns).toBe(1);

  });

  it("does not count a prompt it refused", async () => {

    const session = new CoderSession(scripted(["a"]), "repo", "main");

    await session.submit("   ");

    expect(session.snapshot().turns).toBe(0);

    const first = session.submit("first");

    await session.submit("second while the first runs");

    await first;

    expect(session.snapshot().turns).toBe(1);

  });

  it("carries the source's scope notice, and nothing when the source has none", () => {

    const local = new CoderSession(scripted([]), "repo", "main");

    expect(local.snapshot().scope).toBeUndefined();

    const shared = new CoderSession(

      { ...scripted([]), scopeNotice: "shared with /chat" },

      "repo",

      "main",

    );

    expect(shared.snapshot().scope).toBe("shared with /chat");

  });

  it("carries workspace and model into the snapshot for the status line", () => {

    const session = new CoderSession(new DummyReplySource(), "openagents", "main");

    const snapshot = session.snapshot();

    expect(painted).toContain("\x1b[2m\x1b[3mI should check first.\x1b[0m");

  });

  it("counts the streaming turn, so the bar never reads zero under a live reply", async () => {

    const stdin = new FakeIn();

    const stdout = new FakeOut();

    let release = () => {};

    const held = new Promise<void>((resolve) => {

      release = resolve;

    });

    const paused: ReplySource = {

      model: "scripted",

      async *reply() {

        yield { type: "text", value: "still arriving" } as const;

        await held;

      },

    };

    const session = new CoderSession(paused, "repo", "main");

    const running = runCoderUi(session, {

      stdin: stdin as unknown as NodeJS.ReadStream,

      stdout: stdout as unknown as NodeJS.WriteStream,

    });

    const turn = session.submit("go");

    await new Promise((resolve) => setTimeout(resolve, 0));

    expect(session.snapshot().running).toBe(true);

    const bar = screen(stdout.written).at(-1) ?? "";

    expect(bar).toContain("1 reply this run");

    expect(bar).not.toContain("0 replies");

    release();

    await turn;

    stdin.emit("data", "\x04");

    await running;

  });

  it("labels the count as this run's, because the conversation is not", async () => {

    const { rows } = await drive([{ type: "text", value: "hello" }]);

    expect(rows.at(-1)).toContain("1 reply this run");

  });

  it("says once where the turns are recorded when the source is not private", async () => {

    const stdin = new FakeIn();

    const stdout = new FakeOut();

    const session = new CoderSession(

      { ...source([{ type: "text", value: "hi" }]), scopeNotice: "shared with /chat" },

      "repo",

      "main",

    );

    const running = runCoderUi(session, {

      stdin: stdin as unknown as NodeJS.ReadStream,

      stdout: stdout as unknown as NodeJS.WriteStream,

    });

    await session.submit("go");

    const rows = screen(stdout.written);

    stdin.emit("data", "\x04");

    await running;

    const notes = rows.filter((row) => row.includes("shared with /chat"));

    expect(notes).toHaveLength(1);

    expect(notes[0]).toContain("note");

  });

  it("says nothing about scope when the source keeps its turns to itself", async () => {

    const { rows } = await drive([{ type: "text", value: "hello" }]);

    expect(rows.join("\n")).not.toContain("shared with");

  });

  it("offers no key in the bottom bar that does nothing in that state", async () => {

    const { rows } = await drive([{ type: "text", value: "hello" }]);

    const bar = rows.at(-1) ?? "";