/**
 * DailyNotificationMigration.java
 * 
 * Migration utilities for transitioning from SharedPreferences to SQLite
 * Handles data migration while preserving existing notification data
 * 
 * @author Matthew Raymer
 * @version 1.0.0
 */

package org.timesafari.dailynotification;

import android.content.ContentValues;
import android.content.Context;
import android.content.SharedPreferences;
import android.database.sqlite.SQLiteDatabase;
import android.util.Log;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;

/**
 * Handles migration from SharedPreferences to SQLite database
 * 
 * This class provides utilities to:
 * - Migrate existing notification data from SharedPreferences
 * - Preserve all existing notification content during transition
 * - Provide backward compatibility during migration period
 * - Validate migration success
 */
public class DailyNotificationMigration {
    
    private static final String TAG = "DailyNotificationMigration";
    private static final String PREFS_NAME = "DailyNotificationPrefs";
    private static final String KEY_NOTIFICATIONS = "notifications";
    private static final String KEY_SETTINGS = "settings";
    private static final String KEY_LAST_FETCH = "last_fetch";
    private static final String KEY_ADAPTIVE_SCHEDULING = "adaptive_scheduling";
    
    private final Context context;
    // Legacy SQLite helper reference (now removed). Keep as Object for compatibility; not used.
    private final Object database;
    private final Gson gson;
    
    /**
     * Constructor
     * 
     * @param context Application context
     * @param database SQLite database instance
     */
    public DailyNotificationMigration(Context context, Object database) {
        this.context = context;
        this.database = database;
        this.gson = new Gson();
    }
    
    /**
     * Perform complete migration from SharedPreferences to SQLite
     * 
     * @return true if migration was successful
     */
    public boolean migrateToSQLite() {
        Log.d(TAG, "Migration skipped (legacy SQLite removed)");
        return true;
    }
    
    /**
     * Check if migration is needed
     * 
     * @return true if migration is required
     */
    private boolean isMigrationNeeded() { return false; }
    
    /**
     * Migrate notification content from SharedPreferences to SQLite
     * 
     * @param db SQLite database instance
     * @return Number of notifications migrated
     */
    private int migrateNotificationContent(SQLiteDatabase db) { return 0; }
    
    /**
     * Migrate settings from SharedPreferences to SQLite
     * 
     * @param db SQLite database instance
     * @return Number of settings migrated
     */
    private int migrateSettings(SQLiteDatabase db) { return 0; }
    
    /**
     * Mark migration as complete in the database
     * 
     * @param db SQLite database instance
     */
    private void markMigrationComplete(SQLiteDatabase db) { }
    
    /**
     * Validate migration success
     * 
     * @return true if migration was successful
     */
    public boolean validateMigration() { return true; }
    
    /**
     * Get migration statistics
     * 
     * @return Migration statistics string
     */
    public String getMigrationStats() { return "Migration stats: 0 notifications, 0 settings"; }
}
