Starting to set up main UI for receiving expenses. Definitely in a FORTESTING state.

app/src/main/java/com/hyperling/expensetracker/MainActivity.kt

@@ -10,6 +10,7 @@ import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.material3.Button
 import androidx.compose.material3.FloatingActionButton
@@ -17,6 +18,10 @@ import androidx.compose.material3.Scaffold
 import androidx.compose.material3.Surface
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
@@ -46,23 +51,47 @@ class MainActivity : ComponentActivity() {
 fun Main() {
     val context = LocalContext.current
 
+    var sumDaily by remember { mutableStateOf(0.0) }
+    var sumWeekly by remember { mutableStateOf(0.0) }
+    var sumMonthly by remember { mutableStateOf(0.0) }
+    var sumYearly by remember { mutableStateOf(0.0) }
+
+    val sums = mapOf(
+        "Daily" to sumDaily,
+        "Weekly" to sumWeekly,
+        "Monthly" to sumMonthly,
+        "Yearly" to sumYearly,
+    )
+
     Column (
         horizontalAlignment = Alignment.CenterHorizontally,
         verticalArrangement = Arrangement.Center,
         modifier = Modifier.fillMaxSize()
     ) {
 
-        Row (
-            verticalAlignment = Alignment.CenterVertically,
-            horizontalArrangement = Arrangement.Center
-        ) {
         Text(
-                text = "Main Screen"
+            text = "Current Expense Summary"
         )
+
+        //for ((name, value) in sums) {
+        sums.forEach { (name, value) ->
+            Row (
+                horizontalArrangement = Arrangement.End,
+            ){
+                Text(text = name + ": ")
+                Text(text = value.toString())
             }
+        }
+
+        // FORTESTING
+        Text (text = String.format("%.2f",sumDaily))
+        Text (text = String.format("%.2f",sumWeekly))
+        Text (text = String.format("%.2f",sumMonthly))
+        Text (text = String.format("%.2f",sumYearly))
+
         Row (
             verticalAlignment = Alignment.CenterVertically,
-            horizontalArrangement = Arrangement.Center
+            horizontalArrangement = Arrangement.Center,
         ) {
             Button(onClick = {
                 val intent = Intent(context, NewExpenseActivity::class.java)
@@ -71,6 +100,34 @@ fun Main() {
                 Text(text = "Create New Expense")
             }
         }
+
+        Text(text = "Expenses")
+        // https://medium.com/@rowaido.game/implementing-the-room-library-with-jetpack-compose-590d13101fa7
+        /* TODO:
+            ForEach over all DB records, show it, and add its value to the summary.
+         */
+        val expenseArray = listOf(
+            Expense("Test", 180.0, 'Y', "My notes."),
+            Expense("Test2", 20.0, 'M', "My notes, 2!"),
+        )
+        expenseArray.forEach { expense ->
+            when (expense.freq) {
+                'D' -> sumYearly += (expense.cost * 365.25)
+                'W' -> sumYearly += (expense.cost * (365.25 / 7))
+                'M' -> sumYearly += (expense.cost * 12)
+                'Y' -> sumYearly += (expense.cost)
+            }
+
+            sumDaily = sumYearly / 365.25
+            sumWeekly = sumYearly / (365.25 / 7)
+            sumMonthly = sumYearly / 12
+        }
+
+        // FORTESTING
+        Text (text = String.format("$ %.2f",sumDaily))
+        Text (text = String.format("$ %.2f",sumWeekly))
+        Text (text = String.format("$ %.2f",sumMonthly))
+        Text (text = String.format("$ %.2f",sumYearly))
     }
 }