import { describe, it, expect } from "bun:test";
import {
  inferFromEnvironment,
  getPmPrefix,
  DEFAULT_PREFIX,
  getFallbackNote,
  applyCommandPrefix,
} from "../../src/core/pm.ts";
import type { RuneConfig } from "../../src/types.ts";

describe("inferFromEnvironment", () => {
  it("execPath 包含 bun 时返回 bunx 前缀", () => {
    const result = inferFromEnvironment("/home/user/.bun/bin/bun", undefined);
    expect(result).toBe("bunx @lanyuanxiaoyao/rune");
  });

  it("npm_config_user_agent 包含 pnpm 时返回 pnpx 前缀", () => {
    const result = inferFromEnvironment("/usr/bin/node", "pnpm/9.0.0");
    expect(result).toBe("pnpx @lanyuanxiaoyao/rune");
  });

  it("npm_config_user_agent 包含 npm 时返回 npx 前缀", () => {
    const result = inferFromEnvironment("/usr/bin/node", "npm/10.0.0");
    expect(result).toBe("npx @lanyuanxiaoyao/rune");
  });

  it("pnpm 优先于 npm（userAgent 同时包含两者时）", () => {
    const result = inferFromEnvironment("/usr/bin/node", "pnpm/9.0.0 npm/10.0.0");
    expect(result).toBe("pnpx @lanyuanxiaoyao/rune");
  });

  it("无法推断时返回 null", () => {
    const result = inferFromEnvironment("/usr/bin/node", undefined);
    expect(result).toBeNull();
  });
});

describe("getPmPrefix", () => {
  it("有配置时返回 config.metadata.command", () => {
    const config: RuneConfig = {
      stages: {},
      metadata: { command: "rune" },
    };
    expect(getPmPrefix(config)).toBe("rune");
  });

  it("配置中无 metadata 时返回默认前缀", () => {
    const config: RuneConfig = { stages: {} };
    expect(getPmPrefix(config)).toBe(DEFAULT_PREFIX);
  });

  it("不传配置时返回默认前缀", () => {
    expect(getPmPrefix()).toBe(DEFAULT_PREFIX);
    expect(getPmPrefix(undefined)).toBe("bunx @lanyuanxiaoyao/rune");
  });
});

describe("getFallbackNote", () => {
  it("返回降级说明文本", () => {
    const note = getFallbackNote();
    expect(note).toContain("pnpx @lanyuanxiaoyao/rune");
    expect(note).toContain("npx @lanyuanxiaoyao/rune");
  });
});

describe("applyCommandPrefix", () => {
  it("有配置时替换 rune 为配置前缀", () => {
    const config: RuneConfig = {
      stages: {},
      metadata: { command: "rune" },
    };
    const result = applyCommandPrefix("执行 rune status 查看", config);
    expect(result).toBe("执行 rune status 查看");
  });

  it("无配置时替换为默认前缀", () => {
    const result = applyCommandPrefix("执行 rune status 查看", undefined);
    expect(result).toContain("bunx @lanyuanxiaoyao/rune status");
    expect(result).not.toContain("执行 rune status");
  });

  it("无配置且文本含命令时追加降级说明", () => {
    const result = applyCommandPrefix("执行 rune status 查看", undefined);
    expect(result).toContain("pnpx @lanyuanxiaoyao/rune");
    expect(result).toContain("如果没有安装 bun");
  });

  it("有配置时不追加降级说明", () => {
    const config: RuneConfig = {
      stages: {},
      metadata: { command: "bunx @lanyuanxiaoyao/rune" },
    };
    const result = applyCommandPrefix("执行 rune status 查看", config);
    expect(result).not.toContain("如果没有安装 bun");
  });

  it("不替换 /rune- 形式（编辑器斜杠命令）", () => {
    const text = "使用 /rune-plan 进入规划阶段，然后 rune build 开始构建";
    const config: RuneConfig = {
      stages: {},
      metadata: { command: "bunx @lanyuanxiaoyao/rune" },
    };
    const result = applyCommandPrefix(text, config);
    expect(result).toContain("/rune-plan");
    expect(result).toContain("bunx @lanyuanxiaoyao/rune build");
  });

  it("文本不含 rune 命令时无配置也不追加降级说明", () => {
    const result = applyCommandPrefix("纯文本无命令", undefined);
    expect(result).toBe("纯文本无命令");
  });
});