package main

import (
	"fmt"
	"os"
	"os/exec"
	"strings"
	"syscall"
)

// clipTool is a detected clipboard backend and the command that writes stdin to
// the clipboard (the same command with empty stdin clears it).
type clipTool struct{ copy []string }

func detectClipTool() *clipTool {
	candidates := [][]string{
		{"wl-copy"},
		{"xclip", "-selection", "clipboard"},
		{"xsel", "-b", "-i"},
		{"pbcopy"},
	}
	for _, c := range candidates {
		if _, err := exec.LookPath(c[0]); err == nil {
			return &clipTool{copy: c}
		}
	}
	return nil
}

func clipTime() int {
	return atoiDefault(os.Getenv("PASSWORD_STORE_CLIP_TIME"), 45)
}

// copyClip places text on the clipboard and schedules a detached job to clear it
// after PASSWORD_STORE_CLIP_TIME seconds.
func copyClip(text string) error {
	tool := detectClipTool()
	if tool == nil {
		return errf("no clipboard tool found (install wl-clipboard, xclip, or xsel)")
	}

	c := exec.Command(tool.copy[0], tool.copy[1:]...)
	c.Stdin = strings.NewReader(text)
	if err := c.Run(); err != nil {
		return fmt.Errorf("copying to clipboard: %w", err)
	}

	// Detached clear: new process group so it outlives this CLI invocation.
	clearSh := fmt.Sprintf("sleep %d; printf '' | %s", clipTime(), strings.Join(tool.copy, " "))
	clear := exec.Command("sh", "-c", clearSh)
	clear.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
	return clear.Start()
}