1 files changed, 131 insertions, 0 deletions
diff --git a/app/src/main/java/xyz/adjutor/aniki/presentation/controller/manga/TopMangaController.kt b/app/src/main/java/xyz/adjutor/aniki/presentation/controller/manga/TopMangaController.kt
new file mode 100644
index 0000000..845e750
--- /dev/null
+++ b/app/src/main/java/xyz/adjutor/aniki/presentation/controller/manga/TopMangaController.kt
@@ -0,0 +1,131 @@
+package xyz.adjutor.aniki.presentation.controller.manga
+
+import android.content.Context
+import android.content.SharedPreferences
+import android.view.View
+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.data.manga.TopMangaApi
+import xyz.adjutor.aniki.presentation.model.manga.TopManga
+import xyz.adjutor.aniki.presentation.model.manga.TopMangaResponse
+import xyz.adjutor.aniki.presentation.view.manga.TopMangaPage
+import java.lang.reflect.Type
+import kotlin.properties.Delegates
+
+class TopMangaController {
+
+    lateinit var sharedPreferences: SharedPreferences
+    lateinit var gson: Gson
+    lateinit var baseUrl: String //the api's base url
+    var page by Delegates.notNull<Int>()
+    lateinit var view: TopMangaPage
+
+    fun onStart(topMangaPage: TopMangaPage, viewTopMangaPage: View) {
+
+        view = topMangaPage
+        baseUrl = "https://api.jikan.moe/" //the api's base url
+        page = 1
+        gson = GsonBuilder()
+            .setLenient()
+            .create()
+        sharedPreferences =
+            viewTopMangaPage.context.getSharedPreferences("sp_manga", Context.MODE_PRIVATE)
+
+
+        val mangaList: List<TopManga>? = getDataFromCache()
+        if (mangaList != null) {
+            view.showList(viewTopMangaPage, mangaList)
+        } else {
+            makeApiCall(view, baseUrl, 1)
+        }
+    }
+
+    private fun makeApiCall(view: TopMangaPage, 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)
+                    view.showList(
+                        view.requireView(),
+                        mangaList
+                    ) //calling the method in charge of displaying on the recyclerview
+
+                } else {
+                    view.showError() //a snackbar
+                }
+            }
+
+            override fun onFailure(call: Call<TopMangaResponse>, t: Throwable) {
+                view.showError()
+            }
+
+        })
+    }
+
+    private fun saveList(mangaList: List<TopManga>) {
+        val jsonString: String = gson.toJson(mangaList)
+
+        sharedPreferences
+            .edit()
+            .putString("jsonMangaList", jsonString)
+            .apply()
+    }
+
+    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)
+        }
+    }
+
+
+    fun onButtonPrevClick() {
+        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)
+            view.showText("Page $page has been loaded.")
+        } else {
+            view.showText("You're already on page 1. (If you're actually not, refresh the list.)")
+        }
+    }
+
+    fun onButtonNextClick() {
+        page += 1
+        makeApiCall(view, baseUrl, page)
+        view.showText("Page $page has been loaded.")
+    }
+
+    fun updateList() {
+        makeApiCall(view, baseUrl, 1)
+        view.showText("Data refreshed")
+        page = 1
+    }
+
+}
+\ No newline at end of file