// Package runtimeassets locates tools shipped alongside the application.
package runtimeassets

import (
	"os"
	"path/filepath"
)

// Candidates keeps installed resources ahead of the development checkout.
// Installed applications never depend on the caller's working directory.
func Candidates(relative string) []string {
	exe, _ := os.Executable()
	if resolved, err := filepath.EvalSymlinks(exe); err == nil {
		exe = resolved
	}
	cwd, _ := os.Getwd()
	return candidates(filepath.Dir(exe), cwd, relative)
}

func candidates(exeDir, cwd, relative string) []string {
	return []string{
		filepath.Join(exeDir, relative),
		filepath.Join(exeDir, "..", "Resources", relative),
		filepath.Join(cwd, "third_party", relative),
		filepath.Join(cwd, "..", "third_party", relative),
	}
}

func Find(relative string) string {
	for _, p := range Candidates(relative) {
		if st, err := os.Stat(p); err == nil && !st.IsDir() {
			absolute, _ := filepath.Abs(p)
			return absolute
		}
	}
	return ""
}