add a weekly calendar implementation placeholder

app/src/main/kotlin/com/simplemobiletools/calendar/helpers/MonthlyCalendarImpl.kt

@@ -12,13 +12,12 @@ class MonthlyCalendarImpl(val mCallback: MonthlyCalendar, val mContext: Context)
     private val DAYS_CNT = 42
     private val YEAR_PATTERN = "YYYY"
 
-    private val mToday: String
+    private val mToday: String = DateTime().toString(Formatter.DAYCODE_PATTERN)
     var mEvents: List<Event>
 
     lateinit var mTargetDate: DateTime
 
     init {
-        mToday = DateTime().toString(Formatter.DAYCODE_PATTERN)
         mEvents = ArrayList<Event>()
     }
 

app/src/main/kotlin/com/simplemobiletools/calendar/helpers/WeeklyCalendarImpl.kt

@@ -0,0 +1,25 @@
+package com.simplemobiletools.calendar.helpers
+
+import android.content.Context
+import com.simplemobiletools.calendar.interfaces.WeeklyCalendar
+import com.simplemobiletools.calendar.models.Event
+import org.joda.time.DateTime
+import java.util.*
+
+class WeeklyCalendarImpl(val mCallback: WeeklyCalendar, val mContext: Context) : DBHelper.GetEventsListener {
+    var mEvents: List<Event>
+
+    lateinit var mTargetDate: DateTime
+
+    init {
+        mEvents = ArrayList<Event>()
+    }
+
+    fun updateWeeklyCalendar(targetDate: DateTime) {
+        mTargetDate = targetDate
+    }
+
+    override fun gotEvents(events: MutableList<Event>) {
+        mEvents = events
+    }
+}

app/src/main/kotlin/com/simplemobiletools/calendar/interfaces/WeeklyCalendar.kt

@@ -0,0 +1,7 @@
+package com.simplemobiletools.calendar.interfaces
+
+import com.simplemobiletools.calendar.models.Event
+
+interface WeeklyCalendar {
+    fun updateWeeklyCalendar(events: List<Event>)
+}