package net.kibotu.pgp.app

import android.content.Intent
import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.text.TextUtils.isEmpty
import kotlinx.android.synthetic.main.activity_main.*
import net.kibotu.pgp.Pgp


class MainActivity : AppCompatActivity() {

    private val TAG: String = javaClass.simpleName

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val krgen = Pgp.generateKeyRingGenerator("password".toCharArray())
        Pgp.setPublicKey(Pgp.genPGPPublicKey(krgen))
        Pgp.setPrivateKey(Pgp.genPGPPrivKey(krgen))

        decrypted.setText("decrypted.json".stringFromAssets())
        encrypted.setText("encrypted.json".stringFromAssets())

        encrypt.setOnClickListener {
            val decryptedText = decrypted.text.toString().trim()
            if (!isEmpty(decryptedText))
                encrypted.setText(Pgp.encrypt(decryptedText))
        }

        decrypt.setOnClickListener {
            val encryptedText = encrypted.text.toString().trim()
            if (!isEmpty(encryptedText))
                decrypted.setText(Pgp.decrypt(encryptedText, "password"))
        }

        share.setOnClickListener { share() }
        delete.setOnClickListener {
            encrypted.setText("")
            decrypted.setText("")
        }
    }

    private fun encryptDecryptAssets() {

        Pgp.setPublicKey("rsa.pub".stringFromAssets())
        Pgp.setPrivateKey("rsa".stringFromAssets())

        val encrypted = Pgp.encrypt("decrypted.json".stringFromAssets())
        val decrypted = Pgp.decrypt("encrypted.txt".stringFromAssets(), "password")
    }

    private fun share() {
        share(decrypted.text.toString().trim() + "\n\n" + encrypted.text.toString().trim())
    }

    private fun share(message: String?) {
        val intent = Intent()
        intent.action = Intent.ACTION_SEND
        intent.putExtra(Intent.EXTRA_TEXT, "" + message)
        intent.type = "text/plain"
        startActivity(Intent.createChooser(intent, "Save Data with:"))
    }

    fun String.bytesFromAssets(): ByteArray? = try {
        assets.open(this).use { ByteArray(it.available()).apply { it.read(this) } }
    } catch (e: Exception) {
        e.printStackTrace()
        null
    }

    fun String.stringFromAssets(): String = try {
        assets.open(this).bufferedReader().use { it.readText() }
    } catch (e: Exception) {
        e.printStackTrace()
        ""
    }
}