import { expect, it, describe } from "bun:test";

describe("Bun.Transpiler", () => {
  const transpiler = new Bun.Transpiler({
    loader: "tsx",
    define: {
      "process.env.NODE_ENV": JSON.stringify("development"),
    },
    macro: {
      react: {
        bacon: `${import.meta.dir}/macro-check.js`,
      },
    },
    platform: "browser",
  });

  const code = `import { useParams } from "remix";
  import type { LoaderFunction, ActionFunction } from "remix";
  
  export const loader: LoaderFunction = async ({
    params
  }) => {
    console.log(params.postId);
  };
  
  export const action: ActionFunction = async ({
    params
  }) => {
    console.log(params.postId);
  };
  
  export default function PostRoute() {
    const params = useParams();
    console.log(params.postId);
  }

  `;

  describe("scanImports", () => {
    it("reports import paths, excluding types", () => {
      const imports = transpiler.scanImports(code);
      expect(imports.filter(({ path }) => path === "remix")).toHaveLength(1);
    });
  });

  describe("scan", () => {
    it("reports all export names", () => {
      const { imports, exports } = transpiler.scan(code);

      expect(exports[0]).toBe("action");
      expect(exports[2]).toBe("loader");
      expect(exports[1]).toBe("default");

      expect(exports).toHaveLength(3);
    });
  });

  describe("transform", () => {
    it("supports macros", async () => {
      const out = await transpiler.transform(`
        import {keepSecondArgument} from 'macro:${
          import.meta.dir
        }/macro-check.js';

        export default keepSecondArgument("Test failed", "Test passed");
      `);
      expect(out.includes("Test failed")).toBe(false);
      expect(out.includes("Test passed")).toBe(true);

      // ensure both the import and the macro function call are removed
      expect(out.includes("keepSecondArgument")).toBe(false);
    });

    it("sync supports macros", () => {
      const out = transpiler.transformSync(`
        import {keepSecondArgument} from 'macro:${
          import.meta.dir
        }/macro-check.js';

        export default keepSecondArgument("Test failed", "Test passed");
      `);
      expect(out.includes("Test failed")).toBe(false);
      expect(out.includes("Test passed")).toBe(true);

      expect(out.includes("keepSecondArgument")).toBe(false);
    });

    const importLines = [
      "import {createElement, bacon} from 'react';",
      "import {bacon, createElement} from 'react';",
    ];
    describe("sync supports macros remap", () => {
      for (let importLine of importLines) {
        it(importLine, () => {
          const out = transpiler.transformSync(`
        ${importLine}  
        
        export default bacon("Test failed", "Test passed");
        export function hi() { createElement("hi"); }
      `);

          expect(out.includes("Test failed")).toBe(false);
          expect(out.includes("Test passed")).toBe(true);

          expect(out.includes("bacon")).toBe(false);
          expect(out.includes("createElement")).toBe(true);
        });
      }
    });

    it("macro remap removes import statement if its the only used one", () => {
      const out = transpiler.transformSync(`
        import {bacon} from 'react';
        
        export default bacon("Test failed", "Test passed");
      `);

      expect(out.includes("Test failed")).toBe(false);
      expect(out.includes("Test passed")).toBe(true);

      expect(out.includes("bacon")).toBe(false);
      expect(out.includes("import")).toBe(false);
    });

    it("removes types", () => {
      expect(code.includes("ActionFunction")).toBe(true);
      expect(code.includes("LoaderFunction")).toBe(true);
      const out = transpiler.transformSync(code);

      expect(out.includes("ActionFunction")).toBe(false);
      expect(out.includes("LoaderFunction")).toBe(false);
      const { exports } = transpiler.scan(out);

      expect(exports[0]).toBe("action");
      expect(exports[2]).toBe("loader");
      expect(exports[1]).toBe("default");
      expect(exports).toHaveLength(3);
    });
  });
});