import { createRequire } from "module";
const require = createRequire(import.meta.url);

// Basic smoke tests for @babel/standalone
describe("@babel/standalone", () => {
  let Babel;
  beforeAll(() => {
    Babel = require("../babel.js");
  });

  it("handles the es2015-no-commonjs preset", () => {
    const output = Babel.transform('const getMessage = () => "Hello World"', {
      presets: ["es2015-no-commonjs"],
    }).code;
    expect(output).toBe(
      "var getMessage = function getMessage() {\n" +
        '  return "Hello World";\n' +
        "};",
    );
  });
  it("handles the es2015-loose preset", () => {
    const output = Babel.transform("class A {}", {
      sourceType: "script",
      presets: ["es2015-loose"],
    }).code;
    expect(output).toBe('var A = function A() {\n  "use strict";\n};');
  });
  it("handles the typescript preset", () => {
    const output = Babel.transform("var a: string;", {
      presets: [["typescript", { allExtensions: true }]],
    }).code;
    expect(output).toBe("var a;");
  });
  it("handles the flow preset", () => {
    const output = Babel.transform("var a: string;", {
      presets: ["flow"],
    }).code;
    expect(output).toBe("var a;");
  });
  it("can translate simple ast", () => {
    const ast = {
      type: "Program",
      start: 0,
      end: 2,
      directives: [],
      body: [
        {
          type: "ExpressionStatement",
          start: 0,
          end: 1,
          expression: {
            type: "NumericLiteral",
            start: 0,
            end: 2,
            value: 42,
            raw: "42",
          },
        },
      ],
      sourceType: "script",
    };
    const output = Babel.transformFromAst(ast, "42", {
      presets: ["es2015"],
    }).code;
    expect(output).toBe("42;");
  });

  it("handles the react preset", () => {
    const output = Babel.transform(
      "const someDiv = <div>{getMessage()}</div>",
      {
        presets: [["react", { runtime: "classic" }]],
      },
    ).code;
    expect(output).toBe(
      'const someDiv = /*#__PURE__*/React.createElement("div", null, getMessage());',
    );
  });

  it("handles presets with options", () => {
    const output = Babel.transform("export let x", {
      presets: [["es2015", { modules: false }]],
    }).code;
    expect(output).toBe("export var x;");
  });

  it("handles specifying a plugin by name", () => {
    const output = Babel.transform('const getMessage = () => "Hello World"', {
      plugins: ["transform-arrow-functions"],
    }).code;
    // Transforms arrow syntax but NOT "const".
    expect(output).toBe(
      "const getMessage = function () {\n" + '  return "Hello World";\n' + "};",
    );
  });

  it("handles plugins with options", () => {
    const output = Babel.transform("`${x}`", {
      plugins: [["transform-template-literals", { loose: true }]],
    }).code;
    expect(output).toBe('"" + x;');
  });

  it("throws on invalid preset name", () => {
    expect(() => Babel.transform("var foo", { presets: ["lolfail"] })).toThrow(
      /Invalid preset specified in Babel options: "lolfail"/,
    );
  });

  it("throws on invalid plugin name", () => {
    expect(() => Babel.transform("var foo", { plugins: ["lolfail"] })).toThrow(
      /Invalid plugin specified in Babel options: "lolfail"/,
    );
  });

  describe("env preset", () => {
    it("works w/o targets", () => {
      const output = Babel.transform("const a = 1;", {
        sourceType: "script",
        presets: [["env", { targets: { browsers: "ie 6" } }]],
      }).code;
      expect(output).toBe("var a = 1;");
    });

    it("doesn't transpile `const` with chrome 60", () => {
      const output = Babel.transform("const a = 1;", {
        sourceType: "script",
        presets: [
          [
            "env",
            {
              targets: {
                chrome: 60,
              },
            },
          ],
        ],
      }).code;
      expect(output).toBe("const a = 1;");
    });

    it("transpiles `const` with chrome 60 and preset-es2015", () => {
      const output = Babel.transform("const a = 1;", {
        sourceType: "script",
        presets: [
          [
            "env",
            {
              targets: {
                chrome: 60,
              },
            },
          ],
          "es2015",
        ],
      }).code;
      expect(output).toBe("var a = 1;");
    });

    it("uses transform-new-targets plugin", () => {
      const output = Babel.transform("function Foo() {new.target}", {
        sourceType: "script",
        presets: [["env", { targets: { browsers: "ie 6" } }]],
      }).code;
      expect(output).toBe(
        "function Foo() {\n  this instanceof Foo ? this.constructor : void 0;\n}",
      );
    });

    it("useBuiltIns works", () => {
      const output = Babel.transform("[].includes(2)", {
        sourceType: "module",
        targets: { ie: 11 },
        presets: [["env", { useBuiltIns: "usage", corejs: 3, modules: false }]],
      }).code;

      expect(output).toMatchInlineSnapshot(`
        "import \\"core-js/modules/es.array.includes.js\\";
        [].includes(2);"
      `);
    });

    it("regenerator works", () => {
      const output = Babel.transform("function* fn() {}", {
        sourceType: "module",
        targets: { ie: 11 },
        presets: ["env"],
      }).code;

      expect(output).toMatch("regeneratorRuntime().mark(fn)");
    });
  });

  describe("custom plugins and presets", () => {
    const lolizer = () => ({
      visitor: {
        Identifier(path) {
          path.node.name = "LOL";
        },
      },
    });

    it("allows custom plugins to be registered", () => {
      Babel.registerPlugin("lolizer", lolizer);
      const output = Babel.transform(
        "function helloWorld() { alert(hello); }",
        { plugins: ["lolizer"] },
      );
      expect(output.code).toBe(`function LOL() {
  LOL(LOL);
}`);
    });

    it("allows custom presets to be registered", () => {
      Babel.registerPreset("lulz", { plugins: [lolizer] });
      const output = Babel.transform(
        "function helloWorld() { alert(hello); }",
        { presets: ["lulz"] },
      );
      expect(output.code).toBe(`function LOL() {
  LOL(LOL);
}`);
    });
  });

  describe("regressions", () => {
    it("#11534 - supports quantifiers in unicode regexps", () => {
      expect(() =>
        Babel.transform("/a*/u", { presets: ["es2015"] }),
      ).not.toThrow();
    });
    it("#11628 - supports stage-0 passing importAssertionsVersion to stage-1", () => {
      expect(() =>
        Babel.transform("const getMessage = () => 'Hello World'", {
          presets: [["stage-0", { decoratorsVersion: "legacy" }]],
        }),
      ).not.toThrow();
    });
    it("#11897 - [...map.keys()] in Babel source should be transformed correctly", () => {
      expect(() =>
        Babel.transform("for (let el of []) { s => el }", {
          plugins: ["transform-block-scoping"],
        }),
      ).not.toThrow();
    });
    it("#12815 - unicode property letter short alias should be transformed", () => {
      expect(() =>
        Babel.transform("/\\p{L}/u", {
          plugins: ["proposal-unicode-property-regex"],
        }),
      ).not.toThrow();
    });
    it("#14425 - numeric separators should be parsed correctly", () => {
      expect(() => Babel.transform("1_1", {})).not.toThrow();
    });
  });
});