package name.blackcap.passman

import java.io.BufferedReader
import java.io.File
import java.io.FileInputStream
import java.io.InputStreamReader
import java.nio.charset.StandardCharsets
import java.util.*
import kotlin.system.exitProcess

/* OS Type */

enum class OS {
    MAC, UNIX, WINDOWS, OTHER;
    companion object {
        private val rawType = System.getProperty("os.name")?.lowercase()
        val type = if (rawType == null) {
            OTHER
        } else if (rawType.contains("win")) {
            WINDOWS
        } else if (rawType.contains("mac")) {
            MAC
        } else if (rawType.contains("nix") || rawType.contains("nux") || rawType.contains("aix") || rawType.contains("sunos")) {
            UNIX
        } else {
            OTHER
        }
    }
}

/* joins path name components to java.io.File */

fun joinPath(base: String, vararg rest: String) = rest.fold(File(base), ::File)

/* file names */

private const val SHORTNAME = "passman"
const val MAIN_PACKAGE = "name.blackcap." + SHORTNAME
private val HOME = System.getenv("HOME")
private val PF_DIR = when (OS.type) {
    OS.MAC -> joinPath(HOME, "Library", "Application Support", MAIN_PACKAGE)
    OS.WINDOWS -> joinPath(System.getenv("APPDATA"), MAIN_PACKAGE)
    else -> joinPath(HOME, "." + SHORTNAME)
}

val PROP_FILE = File(PF_DIR, SHORTNAME + ".properties")
val DB_FILE: String = File(PF_DIR, SHORTNAME + ".db").absolutePath

/* make some needed directories */

private fun File.makeIfNeeded() = if (exists()) { true } else { mkdirs() }

/* make some usable objects */

val DPROPERTIES = Properties().apply {
    OS::class.java.getResourceAsStream("/default.properties").use { load(it) }
}

val PROPERTIES = Properties(DPROPERTIES).apply {
    PF_DIR.makeIfNeeded()
    PROP_FILE.createNewFile()
    BufferedReader(InputStreamReader(FileInputStream(PROP_FILE), StandardCharsets.UTF_8)).use  {
        load(it)
    }
}

/* error messages */

fun error(message: String) {
    System.err.println("${SHORTNAME}: ${message}")
}

fun die(message: String, exitStatus: Int = 1) {
    error(message)
    exitProcess(exitStatus)
}