package executables

import (
	"errors"
	"os"
	"velvettear/badger/internal/log"
)

// unexported function(s)
func locateSystemExecutables() []Executable {
	executables := []Executable{}
	for _, executableName := range MandatoryExecutables {
		executable, error := locateSystemExecutable(executableName)
		if error != nil {
			log.Debug("encountered an error locating system executable '"+executableName+"'", error.Error())
			continue
		}
		executables = append(executables, executable)
	}
	return executables
}

func locateSystemExecutable(executableName string) (Executable, error) {
	executable := Executable{Name: executableName}
	if len(executable.Name) == 0 {
		return executable, errors.New("no executable name given")
	}
	result, _ := spawnProcess("which", executable.Name)
	stats, error := os.Stat(result)
	if error != nil {
		return executable, error
	}
	executable.Path = result
	if stats.Mode()&0100 != 0 {
		return executable, errors.New("file '" + executable.Name + "' (" + executable.Path + ") is not executable")
	}
	return executable, nil
}