import type { AssistantMessage } from "@mariozechner/pi-ai";
import { describe, expect, it, vi } from "vitest";
import { createStubSessionHarness } from "./pi-embedded-subscribe.e2e-harness.js";
import { subscribeEmbeddedPiSession } from "./pi-embedded-subscribe.js";

describe("subscribeEmbeddedPiSession", () => {
  it("streams soft chunks with paragraph preference", () => {
    const { session, emit } = createStubSessionHarness();

    const onBlockReply = vi.fn();

    const subscription = subscribeEmbeddedPiSession({
      session,
      runId: "run",
      onBlockReply,
      blockReplyBreak: "message_end",
      blockReplyChunking: {
        minChars: 5,
        maxChars: 25,
        breakPreference: "paragraph",
      },
    });

    const text = "First block line\n\nSecond block line";

    emit({
      type: "message_update",
      message: { role: "assistant" },
      assistantMessageEvent: {
        type: "text_delta",
        delta: text,
      },
    });

    const assistantMessage = {
      role: "assistant",
      content: [{ type: "text", text }],
    } as AssistantMessage;

    emit({ type: "message_end", message: assistantMessage });

    expect(onBlockReply).toHaveBeenCalledTimes(2);
    expect(onBlockReply.mock.calls[0][0].text).toBe("First block line");
    expect(onBlockReply.mock.calls[1][0].text).toBe("Second block line");
    expect(subscription.assistantTexts).toEqual(["First block line", "Second block line"]);
  });
  it("avoids splitting inside fenced code blocks", () => {
    const { session, emit } = createStubSessionHarness();

    const onBlockReply = vi.fn();

    subscribeEmbeddedPiSession({
      session,
      runId: "run",
      onBlockReply,
      blockReplyBreak: "message_end",
      blockReplyChunking: {
        minChars: 5,
        maxChars: 25,
        breakPreference: "paragraph",
      },
    });

    const text = "Intro\n\n```bash\nline1\nline2\n```\n\nOutro";

    emit({
      type: "message_update",
      message: { role: "assistant" },
      assistantMessageEvent: {
        type: "text_delta",
        delta: text,
      },
    });

    const assistantMessage = {
      role: "assistant",
      content: [{ type: "text", text }],
    } as AssistantMessage;

    emit({ type: "message_end", message: assistantMessage });

    expect(onBlockReply).toHaveBeenCalledTimes(3);
    expect(onBlockReply.mock.calls[0][0].text).toBe("Intro");
    expect(onBlockReply.mock.calls[1][0].text).toBe("```bash\nline1\nline2\n```");
    expect(onBlockReply.mock.calls[2][0].text).toBe("Outro");
  });
});