import { test, expect, describe } from "bun:test";
import { buildPrompt, SYSTEM_PROMPT } from "../src/prompt";
import type { ProjectContext } from "../src/types";

describe("prompt", () => {
  test("SYSTEM_PROMPT contains Conventional Commits format", () => {
    expect(SYSTEM_PROMPT).toContain("<type>(<scope>)");
    expect(SYSTEM_PROMPT).toContain("feat");
    expect(SYSTEM_PROMPT).toContain("fix");
  });

  test("buildPrompt with full context", () => {
    const ctx: ProjectContext = {
      readme: "A test project",
      packageDescription: "Test package",
      structure: "src/, tests/",
      recentCommits: ["abc123 feat: initial commit"],
      diff: "+new line\n-old line",
    };

    const prompt = buildPrompt(ctx);

    expect(prompt).toContain("## Project Context");
    expect(prompt).toContain("Test package");
    expect(prompt).toContain("src/, tests/");
    expect(prompt).toContain("A test project");
    expect(prompt).toContain("## Recent Commits");
    expect(prompt).toContain("abc123 feat: initial commit");
    expect(prompt).toContain("## Staged Changes");
    expect(prompt).toContain("+new line");
    expect(prompt).toContain("Generate a commit message");
  });

  test("buildPrompt with minimal context (only diff)", () => {
    const ctx: ProjectContext = {
      readme: null,
      packageDescription: null,
      structure: null,
      recentCommits: [],
      diff: "+added code",
    };

    const prompt = buildPrompt(ctx);

    expect(prompt).not.toContain("## Project Context");
    expect(prompt).not.toContain("## Recent Commits");
    expect(prompt).toContain("## Staged Changes");
    expect(prompt).toContain("+added code");
  });

  test("buildPrompt includes diff as-is (truncation is caller's responsibility)", () => {
    const diff = "+short diff content";
    const ctx: ProjectContext = {
      readme: null,
      packageDescription: null,
      structure: null,
      recentCommits: [],
      diff,
    };

    const prompt = buildPrompt(ctx);
    expect(prompt).toContain(diff);
  });
});