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package xyz.adjutor.aniki.manga.topmanga
import android.content.Context
import android.content.SharedPreferences
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Button
import androidx.fragment.app.Fragment
import androidx.navigation.fragment.findNavController
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
import com.google.android.material.snackbar.Snackbar
import com.google.gson.Gson
import com.google.gson.GsonBuilder
import com.google.gson.reflect.TypeToken
import retrofit2.Call
import retrofit2.Callback
import retrofit2.Response
import retrofit2.Retrofit
import retrofit2.converter.gson.GsonConverterFactory
import xyz.adjutor.aniki.R
import java.lang.reflect.Type
class TopMangaPage : Fragment() {
private lateinit var sharedPreferences: SharedPreferences
val gson: Gson = GsonBuilder()
.setLenient()
.create()
private var baseUrl = "https://api.jikan.moe/" //the api's base url
var page: Int = 1
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
val view = inflater.inflate(R.layout.top_manga_page, container, false)
sharedPreferences = view.context.getSharedPreferences("sp_manga", Context.MODE_PRIVATE)
val mangaList: List<TopManga>? = getDataFromCache()
if (mangaList != null) {
showList(view, mangaList)
} else {
makeApiCall(view, baseUrl, 1)
}
// add other pages when we touch the bottom
val recyclerView: RecyclerView = view.findViewById(R.id.recycler_view)
recyclerView.addOnScrollListener(object : RecyclerView.OnScrollListener() {
override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {
super.onScrollStateChanged(recyclerView, newState)
if (!recyclerView.canScrollVertically(1)) { //direction integers: -1 for up, 1 for down, 0 will always return false.
page += 1
makeApiCall(view, baseUrl, page)
Snackbar.make(
requireView(),
"Page $page has been loaded.",
Snackbar.LENGTH_LONG
)
.setAction("Action", null).show()
}
}
})
return view
}
private fun getDataFromCache(): List<TopManga>? {
//the value of the mangaList json, if nothing is found, return null
val jsonManga: String? = sharedPreferences.getString("jsonMangaList", null)
//if it's null, well, return null
return if (jsonManga == null) {
null
} else { //else deserialize the list and return it
val listType: Type = object : TypeToken<List<TopManga>>() {}.type
gson.fromJson(jsonManga, listType)
}
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
//button to return to the home page
view.findViewById<Button>(R.id.button_home).setOnClickListener {
findNavController().navigate(R.id.action_TopMangaPage_to_HomePage)
}
view.findViewById<Button>(R.id.button_prev).setOnClickListener {
if (page > 1) {
page -= 1
makeApiCall(view, baseUrl, page)
Snackbar.make(requireView(), "Page $page has been loaded.", Snackbar.LENGTH_LONG)
.setAction("Action", null).show()
} else {
Snackbar.make(requireView(), "You're already page 1.", Snackbar.LENGTH_LONG)
.setAction("Action", null).show()
}
}
view.findViewById<Button>(R.id.button_next).setOnClickListener {
page += 1
makeApiCall(view, baseUrl, page)
Snackbar.make(requireView(), "Page $page has been loaded.", Snackbar.LENGTH_LONG)
.setAction("Action", null).show()
}
fun updateList() {
makeApiCall(view, baseUrl, 1)
Snackbar.make(requireView(), "Data refreshed", Snackbar.LENGTH_LONG)
.setAction("Action", null).show()
}
//refresh when swiping down at the top of the page
val swipeRefresh: SwipeRefreshLayout = view.findViewById(R.id.swiperefresh)
swipeRefresh.setOnRefreshListener {
updateList()
page = 1
swipeRefresh.isRefreshing = false
}
}
//display the recyclerview
fun showList(view: View, mangaList: List<TopManga>) {
val recyclerView: RecyclerView = view.findViewById(R.id.recycler_view)
recyclerView.setHasFixedSize(true)
recyclerView.layoutManager = LinearLayoutManager(view.context)
recyclerView.adapter = TopMangaAdapter(mangaList)
(recyclerView.adapter as TopMangaAdapter).notifyDataSetChanged()
}
private fun makeApiCall(view: View, BASE_URL: String, page: Int) {
val retrofit = Retrofit.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create(gson))
.build()
val service = retrofit.create(TopMangaApi::class.java)
val call = service.getTopMangaData(page)
call.enqueue(object : Callback<TopMangaResponse> {
override fun onResponse(
call: Call<TopMangaResponse>,
response: Response<TopMangaResponse>
) {
if (response.isSuccessful && response.body() != null) { //if the code returned is >= 200 and < 300 AND the the body ain't empty
val mangaList: List<TopManga> = response.body()!!
.getResults() //getting the "top" field containing our list of TopMangas
saveList(mangaList)
showList(
view,
mangaList
) //calling the method in charge of displaying on the recyclerview
} else {
showError() //a snackbar
}
}
override fun onFailure(call: Call<TopMangaResponse>, t: Throwable) {
showError()
}
})
}
private fun saveList(mangaList: List<TopManga>) {
val jsonString: String = gson.toJson(mangaList)
sharedPreferences
.edit()
.putString("jsonMangaList", jsonString)
.apply()
}
private fun showError() {
Snackbar.make(requireView(), "API ERROR", Snackbar.LENGTH_LONG)
.setAction("Action", null).show()
}
}
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