package net.lacolaco.smileessence.activity

import android.annotation.SuppressLint
import android.app.Activity
import android.content.Intent
import android.os.Bundle
import android.os.Parcelable
import android.support.v7.app.AppCompatActivity
import android.text.Editable
import android.text.TextWatcher
import android.widget.Toast
import kotlinx.android.parcel.Parcelize
import kotlinx.android.synthetic.main.layout_oauth.*
import net.lacolaco.smileessence.R
import net.lacolaco.smileessence.twitter.TwitterTaskException
import net.lacolaco.smileessence.util.bg
import net.lacolaco.smileessence.util.browse
import net.lacolaco.smileessence.util.launchUi
import twitter4j.TwitterFactory
import twitter4j.auth.RequestToken

class OAuthActivity : AppCompatActivity() {
    private var requestTokenPair: RequestTokenPair? = null

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

        if (savedInstanceState != null)
            requestTokenPair = savedInstanceState.getParcelable(KEY_REQUEST_TOKEN)
        else
            launchUi {
                try {
                    requestTokenPair = RequestTokenPair.requestNewAsync().await()
                    browse(requestTokenPair!!.requestToken.authorizationURL)
                } catch (e: TwitterTaskException) {
                    e.printStackTrace()
                    Toast.makeText(this@OAuthActivity,
                            "Could not get a request token (${e.message})",
                            Toast.LENGTH_LONG).show()
                    setResult(Activity.RESULT_CANCELED)
                    finish()
                }
            }

        button_oauth_auth.isEnabled = false
        editText_oauth_verifier.addTextChangedListener(object : TextWatcher {
            override fun afterTextChanged(p0: Editable) {}

            override fun beforeTextChanged(p0: CharSequence, p1: Int, p2: Int, p3: Int) {}

            override fun onTextChanged(p0: CharSequence, p1: Int, p2: Int, p3: Int) {
                button_oauth_auth.isEnabled = requestTokenPair != null && p0.isNotEmpty()
            }
        })
        button_oauth_auth.setOnClickListener { verify(editText_oauth_verifier.text.toString()) }
    }

    override fun onSaveInstanceState(outState: Bundle) {
        super.onSaveInstanceState(outState)
        outState.putParcelable(KEY_REQUEST_TOKEN, requestTokenPair)
    }

    private fun verify(verifier: String) {
        launchUi {
            val accessToken = try {
                requestTokenPair!!.getAccessTokenAsync(verifier).await()
            } catch (e: TwitterTaskException) {
                Toast.makeText(this@OAuthActivity,
                        "Could not get an access token (${e.message})",
                        Toast.LENGTH_LONG).show()
                setResult(Activity.RESULT_CANCELED)
                finish()
                return@launchUi
            }

            val intent = Intent()
            intent.putExtra(KEY_TOKEN, accessToken.token)
            intent.putExtra(KEY_TOKEN_SECRET, accessToken.tokenSecret)
            intent.putExtra(KEY_USER_ID, accessToken.userId)
            intent.putExtra(KEY_SCREEN_NAME, accessToken.screenName)
            setResult(RESULT_OK, intent)
            finish()
        }
    }

    companion object {
        const val KEY_TOKEN = "token"
        const val KEY_TOKEN_SECRET = "tokenSecret"
        const val KEY_SCREEN_NAME = "screenName"
        const val KEY_USER_ID = "userID"
        private const val KEY_REQUEST_TOKEN = "REQUEST_TOKEN"
    }

    @Parcelize
    @SuppressLint("ParcelCreator")
    private class RequestTokenPair(val token: String, val tokenSecret: String) : Parcelable {
        val requestToken
            get() = RequestToken(token, tokenSecret)

        fun getAccessTokenAsync(verifier: String) = bg {
            TwitterTaskException.wrap {
                TwitterFactory().instance.getOAuthAccessToken(requestToken, verifier)
            }
        }

        companion object {
            fun requestNewAsync() = bg {
                val requestToken = TwitterTaskException.wrap {
                    TwitterFactory().instance.getOAuthRequestToken("oob")
                }
                RequestTokenPair(requestToken.token, requestToken.tokenSecret)
            }
        }
    }
}