Merge pull request #52 from MihaiCristianCondrea/codex/create-data-layer-structure-and-migrate-repositories

Refactor home and quiz repositories into centralized data layer

Author: MihaiCristianCondrea

app/src/main/java/com/d4rk/androidtutorials/java/data/repository/DefaultHomeRepository.java

@@ -0,0 +1,42 @@
+package com.d4rk.androidtutorials.java.data.repository;
+
+import android.content.Intent;
+
+import com.d4rk.androidtutorials.java.data.source.HomeLocalDataSource;
+import com.d4rk.androidtutorials.java.data.source.HomeRemoteDataSource;
+import com.d4rk.androidtutorials.java.data.source.HomeRemoteDataSource.PromotedAppsCallback;
+
+/**
+ * Default implementation of {@link HomeRepository} combining local and remote sources.
+ */
+public class DefaultHomeRepository implements HomeRepository {
+
+    private final HomeRemoteDataSource remoteDataSource;
+    private final HomeLocalDataSource localDataSource;
+
+    public DefaultHomeRepository(HomeRemoteDataSource remoteDataSource,
+                                 HomeLocalDataSource localDataSource) {
+        this.remoteDataSource = remoteDataSource;
+        this.localDataSource = localDataSource;
+    }
+
+    @Override
+    public Intent getPlayStoreIntent() {
+        return localDataSource.getPlayStoreIntent();
+    }
+
+    @Override
+    public Intent getAppPlayStoreIntent(String packageName) {
+        return localDataSource.getAppPlayStoreIntent(packageName);
+    }
+
+    @Override
+    public String getDailyTip() {
+        return localDataSource.getDailyTip();
+    }
+
+    @Override
+    public void fetchPromotedApps(PromotedAppsCallback callback) {
+        remoteDataSource.fetchPromotedApps(callback);
+    }
+}

app/src/main/java/com/d4rk/androidtutorials/java/data/repository/DefaultQuizRepository.java

@@ -0,0 +1,23 @@
+package com.d4rk.androidtutorials.java.data.repository;
+
+import com.d4rk.androidtutorials.java.data.model.QuizQuestion;
+import com.d4rk.androidtutorials.java.data.source.QuizLocalDataSource;
+
+import java.util.List;
+
+/**
+ * Default implementation of {@link QuizRepository} using a local data source.
+ */
+public class DefaultQuizRepository implements QuizRepository {
+
+    private final QuizLocalDataSource localDataSource;
+
+    public DefaultQuizRepository(QuizLocalDataSource localDataSource) {
+        this.localDataSource = localDataSource;
+    }
+
+    @Override
+    public List<QuizQuestion> loadQuestions() {
+        return localDataSource.loadQuestions();
+    }
+}

app/src/main/java/com/d4rk/androidtutorials/java/data/repository/HomeRepository.java

@@ -0,0 +1,20 @@
+package com.d4rk.androidtutorials.java.data.repository;
+
+import android.content.Intent;
+
+import com.d4rk.androidtutorials.java.data.model.PromotedApp;
+import com.d4rk.androidtutorials.java.data.source.HomeRemoteDataSource.PromotedAppsCallback;
+
+/**
+ * Abstraction over home data operations.
+ */
+public interface HomeRepository {
+
+    Intent getPlayStoreIntent();
+
+    Intent getAppPlayStoreIntent(String packageName);
+
+    String getDailyTip();
+
+    void fetchPromotedApps(PromotedAppsCallback callback);
+}

app/src/main/java/com/d4rk/androidtutorials/java/data/repository/QuizRepository.java

@@ -0,0 +1,12 @@
+package com.d4rk.androidtutorials.java.data.repository;
+
+import com.d4rk.androidtutorials.java.data.model.QuizQuestion;
+
+import java.util.List;
+
+/**
+ * Abstraction over quiz data operations.
+ */
+public interface QuizRepository {
+    List<QuizQuestion> loadQuestions();
+}

app/src/main/java/com/d4rk/androidtutorials/java/data/source/DefaultHomeLocalDataSource.java

@@ -0,0 +1,48 @@
+package com.d4rk.androidtutorials.java.data.source;
+
+import android.content.Context;
+import android.content.Intent;
+import android.net.Uri;
+
+import com.d4rk.androidtutorials.java.R;
+
+/**
+ * Default implementation that reads from Android resources.
+ */
+public class DefaultHomeLocalDataSource implements HomeLocalDataSource {
+
+    private final Context context;
+
+    public DefaultHomeLocalDataSource(Context context) {
+        this.context = context.getApplicationContext();
+    }
+
+    @Override
+    public Intent getPlayStoreIntent() {
+        String playStoreUrl = "https://play.google.com/store/apps/details?id=com.d4rk.androidtutorials";
+        return buildPlayStoreIntent(playStoreUrl);
+    }
+
+    @Override
+    public Intent getAppPlayStoreIntent(String packageName) {
+        String url = "https://play.google.com/store/apps/details?id=" + packageName;
+        return buildPlayStoreIntent(url);
+    }
+
+    @Override
+    public String getDailyTip() {
+        String[] tips = context.getResources().getStringArray(R.array.daily_tips);
+        long daysSinceEpoch = System.currentTimeMillis() / (24L * 60 * 60 * 1000);
+        int index = (int) (daysSinceEpoch % tips.length);
+        return tips[index];
+    }
+
+    private Intent buildPlayStoreIntent(String url) {
+        Intent playStoreIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
+        playStoreIntent.setPackage("com.android.vending");
+        if (playStoreIntent.resolveActivity(context.getPackageManager()) != null) {
+            return playStoreIntent;
+        }
+        return new Intent(Intent.ACTION_VIEW, Uri.parse(url));
+    }
+}

app/src/main/java/com/d4rk/androidtutorials/java/data/source/DefaultHomeRemoteDataSource.java

@@ -0,0 +1,60 @@
+package com.d4rk.androidtutorials.java.data.source;
+
+import com.android.volley.Request;
+import com.android.volley.RequestQueue;
+import com.android.volley.toolbox.JsonObjectRequest;
+import com.d4rk.androidtutorials.java.data.model.PromotedApp;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Volley based implementation of {@link HomeRemoteDataSource}.
+ */
+public class DefaultHomeRemoteDataSource implements HomeRemoteDataSource {
+
+    private final RequestQueue requestQueue;
+    private final String apiUrl;
+
+    public DefaultHomeRemoteDataSource(RequestQueue requestQueue, String apiUrl) {
+        this.requestQueue = requestQueue;
+        this.apiUrl = apiUrl;
+    }
+
+    @Override
+    public void fetchPromotedApps(PromotedAppsCallback callback) {
+        JsonObjectRequest request = new JsonObjectRequest(
+                Request.Method.GET,
+                apiUrl,
+                null,
+                response -> {
+                    List<PromotedApp> result = new ArrayList<>();
+                    try {
+                        JSONArray apps = response.getJSONObject("data").getJSONArray("apps");
+                        for (int i = 0; i < apps.length(); i++) {
+                            JSONObject obj = apps.getJSONObject(i);
+                            String pkg = obj.getString("packageName");
+                            if (pkg.contains("com.d4rk.androidtutorials")) {
+                                continue;
+                            }
+                            result.add(new PromotedApp(
+                                    obj.getString("name"),
+                                    pkg,
+                                    obj.getString("iconLogo")
+                            ));
+                        }
+                    } catch (JSONException e) {
+                        result = Collections.emptyList();
+                    }
+                    callback.onResult(result);
+                },
+                error -> callback.onResult(Collections.emptyList())
+        );
+        requestQueue.add(request);
+    }
+}

app/src/main/java/com/d4rk/androidtutorials/java/ui/screens/quiz/repository/QuizRepository.java renamed to app/src/main/java/com/d4rk/androidtutorials/java/data/source/DefaultQuizLocalDataSource.java

@@ -1,6 +1,6 @@
-package com.d4rk.androidtutorials.java.ui.screens.quiz.repository;
+package com.d4rk.androidtutorials.java.data.source;
 
-import android.content.Context;
+import android.content.res.AssetManager;
 
 import com.d4rk.androidtutorials.java.data.model.QuizQuestion;
 
@@ -16,25 +16,21 @@
 import java.util.List;
 
 /**
- * Repository responsible for loading quiz question data from JSON assets.
+ * Reads quiz questions from the assets folder.
  */
-public class QuizRepository {
+public class DefaultQuizLocalDataSource implements QuizLocalDataSource {
 
-    private final Context context;
+    private final AssetManager assetManager;
 
-    public QuizRepository(Context context) {
-        this.context = context.getApplicationContext();
+    public DefaultQuizLocalDataSource(AssetManager assetManager) {
+        this.assetManager = assetManager;
     }
 
-    /**
-     * Loads the quiz questions from the assets folder.
-     */
+    @Override
     public List<QuizQuestion> loadQuestions() {
-        try {
-            InputStream is = context.getAssets().open("quiz_questions.json");
+        try (InputStream is = assetManager.open("quiz_questions.json")) {
             byte[] buffer = new byte[is.available()];
             int read = is.read(buffer);
-            is.close();
             String json = new String(buffer, 0, read, StandardCharsets.UTF_8);
             JSONArray array = new JSONArray(json);
             List<QuizQuestion> result = new ArrayList<>();

app/src/main/java/com/d4rk/androidtutorials/java/data/source/HomeLocalDataSource.java

@@ -0,0 +1,15 @@
+package com.d4rk.androidtutorials.java.data.source;
+
+import android.content.Intent;
+
+/**
+ * Local data access for the home feature.
+ */
+public interface HomeLocalDataSource {
+
+    Intent getPlayStoreIntent();
+
+    Intent getAppPlayStoreIntent(String packageName);
+
+    String getDailyTip();
+}

app/src/main/java/com/d4rk/androidtutorials/java/data/source/HomeRemoteDataSource.java

@@ -0,0 +1,17 @@
+package com.d4rk.androidtutorials.java.data.source;
+
+import com.d4rk.androidtutorials.java.data.model.PromotedApp;
+
+import java.util.List;
+
+/**
+ * Contract for fetching home screen data from remote sources.
+ */
+public interface HomeRemoteDataSource {
+
+    interface PromotedAppsCallback {
+        void onResult(List<PromotedApp> apps);
+    }
+
+    void fetchPromotedApps(PromotedAppsCallback callback);
+}

app/src/main/java/com/d4rk/androidtutorials/java/data/source/QuizLocalDataSource.java

@@ -0,0 +1,12 @@
+package com.d4rk.androidtutorials.java.data.source;
+
+import com.d4rk.androidtutorials.java.data.model.QuizQuestion;
+
+import java.util.List;
+
+/**
+ * Contract for reading quiz data from local storage.
+ */
+public interface QuizLocalDataSource {
+    List<QuizQuestion> loadQuestions();
+}