added prepending free subjects to timetable when the day does not start with subject number 1

mobile/app/src/main/java/com/odweta/solon/Parsing.kt

@@ -269,6 +269,24 @@ class Parsing {
                     auxSubjects.add(Subject.empty())
                 }
 
+                // prepend free subjects when day does not start with subject number 1
+                val newSubjects: MutableList<Subject> = mutableListOf()
+                var n = auxSubjects[0].number.toInt()
+                while (n > 1) {
+                    newSubjects.add(
+                        Subject.freeSubject(
+                            number = (n - 1).toString(),
+                            start = "00:00",
+                            end = "00:00"
+                        )
+                    )
+                    n -= 1
+                }
+                val finalSubjects: MutableList<Subject> = mutableListOf()
+                finalSubjects.addAll(newSubjects.reversed())
+                finalSubjects.addAll(auxSubjects)
+
+
                 for ((i, s) in auxSubjects.withIndex()) {
                     if (s.free) {
                         s.start = auxSubjects[i-1].end
@@ -279,7 +297,7 @@ class Parsing {
                 val day = Day()
                 day.name = name
                 day.date = date
-                day.subjects = auxSubjects
+                day.subjects = finalSubjects
 
                 // get rid of duplicates
                 val nextSubjects: MutableList<Subject> = mutableListOf()

mobile/app/src/main/java/com/odweta/solon/Timetable.kt

@@ -1,6 +1,7 @@
 package com.odweta.solon
 
 import android.annotation.SuppressLint
+import android.graphics.drawable.Drawable
 import androidx.compose.foundation.ExperimentalFoundationApi
 import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Arrangement
@@ -220,8 +221,12 @@ private fun DayScreen(day: Day) {
                 if (day.subjects.indexOf(subject) > 0) {
                     Box(modifier = Modifier.height(10.dp)) {
                         if (subject.name == day.subjects[day.subjects.indexOf(subject) - 1].name) {
+                            val drawable =
+                                if (subject.free) { R.drawable.squiggly_line_green }
+                                else { R.drawable.squiggly_line_yellow }
+
                             Image(
-                                painter = painterResource(R.drawable.squiggly_line_yellow),
+                                painter = painterResource(drawable),
                                 contentDescription = "Spojovač stejných předmětů",
                                 modifier = Modifier.fillMaxSize()
                             )
@@ -324,11 +329,14 @@ private fun DayScreen(day: Day) {
                             verticalArrangement = Arrangement.Center,
                             horizontalAlignment = Alignment.End
                         ) {
-                            Text(
-                                text = "${subject.start}–${subject.end}",
-                                color = Color.White,
-                                fontSize = 21.sp
-                            )
+                            // show only for non prepended free lectures
+                            if ((subject.free && subject.start != "00:00" && subject.end != "00:00") || !subject.free) {
+                                Text(
+                                    text = "${subject.start}–${subject.end}",
+                                    color = Color.White,
+                                    fontSize = 21.sp
+                                )
+                            }
 
                             if (!subject.free) {
                                 Box (