package com.example.apicoroutinestreningv1

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Toast
import androidx.lifecycle.observe
import androidx.recyclerview.widget.GridLayoutManager
import kotlinx.android.synthetic.main.activity_main.*
import okhttp3.OkHttpClient
import okhttp3.logging.HttpLoggingInterceptor
import retrofit2.*
import retrofit2.converter.gson.GsonConverterFactory


class MainActivity : AppCompatActivity() {

    private val api by lazy { createApi() }
    private val repository by lazy { Repository(api) }
    private val viewModel by lazy { MainViewModel(repository) }
    private val adapter by lazy { BeerAdapter() }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        initRecycler()
        observeBeerChanges()
        observeErrorChanges()
        viewModel.onViewCreated()
    }

    private fun observeErrorChanges(){
        viewModel.error.observe(this){throwable ->
            throwable.message?.let { showErrorMessage(it) }
        }
    }

    private fun observeBeerChanges() {
        viewModel.beers.observe(this) {
            showBeers(it)
        }
    }

    private fun initRecycler(){
        recyclerView.layoutManager = GridLayoutManager(this, 1)
        recyclerView.adapter = adapter
    }

    private fun showErrorMessage(message: String){
        Toast.makeText(this, "An error occured, code: $message", Toast.LENGTH_LONG).show()
    }

    private fun showBeers(beers: List<Beer>){
        adapter.setBeers(beers)
    }

    private fun createApi(): BrewDogApi  { //prywatna metoda zeby stworzyc interfejs. robie to po zrobienie beers, BDapi, BeerResponse
        val baseUrl = "https://api.punkapi.com/v2/"

        val interceptor = HttpLoggingInterceptor()
            .apply { level = HttpLoggingInterceptor.Level.BODY }
        val okHttpClient = OkHttpClient.Builder()
            .addInterceptor(interceptor)
            .build()

        //teraz robimy obiekt retrofita
        val retrofit = Retrofit.Builder()
            .baseUrl(baseUrl)
            .addConverterFactory(GsonConverterFactory.create())
            .build()

       return retrofit.create(BrewDogApi::class.java)
    }
}