import { describe, it, expect } from "vitest";
import { splitBlocks } from "../src/trackChangesModel";

describe("splitBlocks", () => {
  it("splits prose paragraphs on blank lines, dropping empties", () => {
    const blocks = splitBlocks("# Heading\n\nFirst para.\n\nSecond para.\n");
    expect(blocks.map((b) => b.type)).toEqual(["prose", "prose", "prose"]);
    expect(blocks[0].raw).toBe("# Heading");
    expect(blocks[2].raw).toBe("Second para.");
  });

  it("keeps a fenced code block whole and tags it `code`", () => {
    const text = "Intro.\n\n```ts\nconst a = 1;\n\nconst b = 2;\n```\n\nOutro.\n";
    const blocks = splitBlocks(text);
    expect(blocks.map((b) => b.type)).toEqual(["prose", "code", "prose"]);
    expect(blocks[1].raw).toBe("```ts\nconst a = 1;\n\nconst b = 2;\n```");
  });

  it("tags a mermaid fence `mermaid`", () => {
    const blocks = splitBlocks("```mermaid\nflowchart LR\n  a-->b\n```\n");
    expect(blocks).toHaveLength(1);
    expect(blocks[0].type).toBe("mermaid");
  });

  it("normalizes the key (whitespace-collapsed) for matching", () => {
    const blocks = splitBlocks("Hello    world\n");
    expect(blocks[0].key).toBe("hello world");
  });
});