package app

import (
	"fmt"
	"os/exec"
)

// scpArgs builds the scp command line. Files are uploaded in the given order;
// callers pass the playlist LAST so stream links never 404 before the files.
func scpArgs(files []string, target, keyPath string) []string {
	args := []string{"-o", "StrictHostKeyChecking=accept-new", "-q"}
	if keyPath != "" {
		args = append(args, "-i", keyPath)
	}
	args = append(args, files...)
	args = append(args, target)
	return args
}

// Ship uploads files to target (user@host:/path/) via scp.
func Ship(files []string, target, keyPath string) error {
	if len(files) == 0 {
		return nil
	}
	if target == "" {
		return fmt.Errorf("ship target not configured")
	}
	out, err := exec.Command("scp", scpArgs(files, target, keyPath)...).CombinedOutput()
	if err != nil {
		return fmt.Errorf("scp to %s: %w: %s", target, err, out)
	}
	return nil
}