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package main

import (
	"fmt"
	"io"

	"github.com/google/go-jsonnet"
)

func Transpile(in io.Reader, repoURL string) (string, error) {
	data, err := io.ReadAll(in)
	if err != nil {
		return "", err
	}
	vm := jsonnet.MakeVM()
	output, err := vm.EvaluateAnonymousSnippet("policy.jsonnet", string(data))
	if err != nil {
		return "", err
	}
	stanza := fmt.Sprintf("// This tailnet's ACLs are maintained in %s", repoURL)
	return fmt.Sprintf("%s\n%s", stanza, output), nil
}