import { describe, it, expect, beforeEach, afterEach } from "bun:test";
import { existsSync } from "node:fs";
import { mkdir, rm, readFile, writeFile } from "node:fs/promises";
import { join } from "node:path";
import { runInit } from "../../src/commands/init.ts";
import { CommandError } from "../../src/cli/errors.ts";

const TMP_DIR = join(import.meta.dir, "__tmp_init_test__");

beforeEach(async () => {
  await mkdir(TMP_DIR, { recursive: true });
});

afterEach(async () => {
  await rm(TMP_DIR, { recursive: true, force: true });
});

describe("runInit", () => {
  it("创建 .rune 目录和空 config.yaml", async () => {
    await runInit(TMP_DIR, ["opencode"]);

    expect(existsSync(join(TMP_DIR, ".rune"))).toBe(true);
    expect(existsSync(join(TMP_DIR, ".rune", "config.yaml"))).toBe(true);

    const content = await readFile(join(TMP_DIR, ".rune", "config.yaml"), "utf-8");
    expect(content).toContain("# Rune 配置文件");
    expect(content).toContain("stages:");
  });

  it("创建 .rune/changes 和 .rune/archive 目录", async () => {
    await runInit(TMP_DIR, ["opencode"]);

    expect(existsSync(join(TMP_DIR, ".rune", "changes"))).toBe(true);
    expect(existsSync(join(TMP_DIR, ".rune", "archive"))).toBe(true);
  });

  it("注入 OpenCode command 和 skill", async () => {
    await runInit(TMP_DIR, ["opencode"]);

    expect(existsSync(join(TMP_DIR, ".opencode", "commands", "rune-discuss.md"))).toBe(true);
    expect(existsSync(join(TMP_DIR, ".opencode", "skills", "rune-discuss", "SKILL.md"))).toBe(true);
  });

  it("重复 init 不覆盖 config.yaml 已有内容", async () => {
    await runInit(TMP_DIR, ["opencode"]);
    await writeFile(join(TMP_DIR, ".rune", "config.yaml"), "自定义内容");

    await runInit(TMP_DIR, ["opencode"]);
    const content = await readFile(join(TMP_DIR, ".rune", "config.yaml"), "utf-8");
    expect(content).toContain("自定义内容");
  });

  it("不支持的工具名抛出 CommandError", async () => {
    try {
      await runInit(TMP_DIR, ["unknown-tool"]);
      expect.unreachable("应抛出错误");
    } catch (e) {
      expect(e).toBeInstanceOf(CommandError);
      expect((e as CommandError).message).toContain("不支持的工具: unknown-tool");
    }
  });

  it("首次 init 时 config.yaml 包含 metadata.command", async () => {
    await runInit(TMP_DIR, ["opencode"]);

    const content = await readFile(join(TMP_DIR, ".rune", "config.yaml"), "utf-8");
    expect(content).toContain("metadata:");
    expect(content).toContain("command:");
  });

  it("config.yaml 模板不含 {{change-name}}", async () => {
    await runInit(TMP_DIR, ["opencode"]);

    const content = await readFile(join(TMP_DIR, ".rune", "config.yaml"), "utf-8");
    expect(content).not.toContain("{{change-name}}");
  });

  it("config.yaml 模板包含 metadata 说明", async () => {
    await runInit(TMP_DIR, ["opencode"]);

    const content = await readFile(join(TMP_DIR, ".rune", "config.yaml"), "utf-8");
    expect(content).toContain("metadata");
    expect(content).toContain("tracked");
  });

  it("config.yaml 模板包含 create 阶段", async () => {
    await runInit(TMP_DIR, ["opencode"]);

    const content = await readFile(join(TMP_DIR, ".rune", "config.yaml"), "utf-8");
    expect(content).toContain("create");
  });
});