From 5a8c22508e08b00a31c8ebb4df13d9e108d29e1f Mon Sep 17 00:00:00 2001
From: Clyhtsuriva <aimeric@adjutor.xyz>
Date: Tue, 13 Apr 2021 13:22:04 +0200
Subject: Restructuring and README update.

---
 .../aniki/presentation/view/manga/TopMangaPage.kt  | 178 +++++++++++++++++++++
 1 file changed, 178 insertions(+)
 create mode 100644 app/src/main/java/xyz/adjutor/aniki/presentation/view/manga/TopMangaPage.kt

(limited to 'app/src/main/java/xyz/adjutor/aniki/presentation/view/manga/TopMangaPage.kt')

diff --git a/app/src/main/java/xyz/adjutor/aniki/presentation/view/manga/TopMangaPage.kt b/app/src/main/java/xyz/adjutor/aniki/presentation/view/manga/TopMangaPage.kt
new file mode 100644
index 0000000..edb5fea
--- /dev/null
+++ b/app/src/main/java/xyz/adjutor/aniki/presentation/view/manga/TopMangaPage.kt
@@ -0,0 +1,178 @@
+package xyz.adjutor.aniki.presentation.view.manga
+
+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 xyz.adjutor.aniki.data.manga.TopMangaApi
+import xyz.adjutor.aniki.presentation.model.manga.TopManga
+import xyz.adjutor.aniki.presentation.model.manga.TopMangaResponse
+import java.lang.reflect.Type
+
+//view
+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)
+        }
+
+        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) { // if we're not on the first page, because we can't go back if we're on the first one.
+                page -= 1
+                makeApiCall(view, baseUrl, page)
+                Snackbar.make(requireView(), "Page $page has been loaded.", Snackbar.LENGTH_SHORT)
+                    .setAction("Action", null).show()
+            } else {
+                Snackbar.make(requireView(), "You're already on page 1.", Snackbar.LENGTH_SHORT)
+                    .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_SHORT)
+                .setAction("Action", null).show()
+        }
+
+        fun updateList() {
+            makeApiCall(view, baseUrl, 1)
+            Snackbar.make(requireView(), "Data refreshed", Snackbar.LENGTH_SHORT)
+                .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 : Verify your internet connection.",
+            Snackbar.LENGTH_LONG
+        )
+            .setAction("Action", null).show()
+    }
+
+}
\ No newline at end of file
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