package runtime

import (
	"archive/zip"
	"bytes"
	"io"
	"strings"
	"testing"
)

func TestBuildJSDeployZipExportsMainAndHandler(t *testing.T) {
	zipBytes, err := BuildJSDeployZip(`module.exports = async function () { return { status: 200, body: "ok" }; }`)
	if err != nil {
		t.Fatalf("BuildJSDeployZip() error = %v", err)
	}

	zr, err := zip.NewReader(bytes.NewReader(zipBytes), int64(len(zipBytes)))
	if err != nil {
		t.Fatalf("zip.NewReader() error = %v", err)
	}

	files := map[string]string{}
	for _, file := range zr.File {
		rc, openErr := file.Open()
		if openErr != nil {
			t.Fatalf("open %q: %v", file.Name, openErr)
		}
		content, readErr := io.ReadAll(rc)
		_ = rc.Close()
		if readErr != nil {
			t.Fatalf("read %q: %v", file.Name, readErr)
		}
		files[file.Name] = string(content)
	}

	if files["package.json"] != `{"type":"module"}` {
		t.Fatalf("package.json = %q, want ESM marker", files["package.json"])
	}

	mainJS := files["main.js"]
	if !strings.Contains(mainJS, `export { __invoke as main, __invoke as handler };`) {
		t.Fatalf("main.js does not export both main and handler: %s", mainJS)
	}
	if !strings.Contains(mainJS, `export default __invoke;`) {
		t.Fatalf("main.js does not export default invoke: %s", mainJS)
	}
	if !strings.Contains(mainJS, `_fn.default || _fn.handler || _fn.main`) {
		t.Fatalf("main.js lost user export resolution: %s", mainJS)
	}
}