package worker

import (
	"bytes"
	"fmt"
	"os/exec"
)

func RunFunction(path string, fc *FuncConfig, input []byte) ([]byte, error) {
	if fc.Runtime != "exec" {
		return nil, fmt.Errorf("unsupported runtime: %s", fc.Runtime)
	}

	cmd := exec.Command(path)
	cmd.Stdin = bytes.NewReader(input)

	var out bytes.Buffer
	cmd.Stdout = &out
	cmd.Stderr = &out

	if err := cmd.Run(); err != nil {
		return nil, fmt.Errorf("failed: %w\noutput: %s", err, out.String())
	}
	return out.Bytes(), nil
}