Settings menu completed

TODO

@@ -3,11 +3,11 @@ functionality:
 refactor:
     (done) extract file opener from settings activity
     (done) extract zip parser from settings activity
-    make use of Config.kt (maybe move consts here?)
+    (done) make use of Config.kt
 fix:
     app rotation with placed point
 ui:
-    proper file loading menu
+    (done) proper file loading menu
     translation usage
 test:
     khm:

app/src/main/java/com/mirenkov/ktheightmap/Config.kt

@@ -1,8 +0,0 @@
-package com.mirenkov.ktheightmap
-
-class Config {
-    companion object {
-        const val MAP_START_OFFSET_X = -646.65625F
-        const val MAP_START_OFFSET_Y = -1157.2814F
-    }
-}

app/src/main/java/com/mirenkov/ktheightmap/FileLoader.kt

@@ -13,7 +13,9 @@ import com.nareshchocha.filepickerlibrary.models.FilePickerResult
 class FileLoader {
     companion object {
         var filePath: MutableState<String?> = mutableStateOf(null)
+        val launcherActive = mutableStateOf(false)
         fun filePickerResult(result: FilePickerResult): String? {
+            launcherActive.value = false
             if (result.errorMessage != null) {
                 Log.e(TAG, result.errorMessage!!)
                 return null

app/src/main/java/com/mirenkov/ktheightmap/Global.kt

@@ -0,0 +1,32 @@
+package com.mirenkov.ktheightmap
+
+import android.util.Log
+import java.io.FileInputStream
+import java.util.zip.ZipEntry
+import java.util.zip.ZipException
+import java.util.zip.ZipInputStream
+
+class Global {
+    companion object {
+        const val MAP_START_OFFSET_X = -646.65625F
+        const val MAP_START_OFFSET_Y = -1157.2814F
+
+        fun fileIsValidZip(file: String): Boolean {
+            ZipInputStream(FileInputStream(file)).use {
+                return it.nextEntry != null
+            }
+        }
+
+        fun zipContainsSQLite(file: String): Boolean {
+            ZipInputStream(FileInputStream(file)).use {
+                var entry: ZipEntry? = it.nextEntry
+                while (entry != null) {
+                    if (entry.name.endsWith(".sqlitedb"))
+                        return true
+                    entry = it.nextEntry
+                }
+            }
+            return false
+        }
+    }
+}

app/src/main/java/com/mirenkov/ktheightmap/MapCanvas.kt

@@ -29,12 +29,9 @@ import androidx.compose.ui.text.drawText
 import androidx.compose.ui.text.rememberTextMeasurer
 import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.text.withStyle
-import com.mirenkov.ktheightmap.Config.Companion.MAP_START_OFFSET_X
-import com.mirenkov.ktheightmap.Config.Companion.MAP_START_OFFSET_Y
 import com.mirenkov.ktheightmap.parser.KhmParser
 import kotlin.math.absoluteValue
 import kotlin.math.ceil
-import kotlin.math.floor
 import kotlin.math.min
 import kotlin.math.pow
 import kotlin.math.sqrt

app/src/main/java/com/mirenkov/ktheightmap/SettingsActivity.kt

@@ -13,13 +13,16 @@ import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.padding
 import androidx.compose.material3.Button
+import androidx.compose.material3.CircularProgressIndicator
 import androidx.compose.material3.HorizontalDivider
 import androidx.compose.material3.Scaffold
 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.rememberCoroutineScope
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
@@ -32,6 +35,8 @@ import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.lifecycle.viewmodel.compose.LocalViewModelStoreOwner
 import androidx.lifecycle.viewmodel.compose.viewModel
+import com.mirenkov.ktheightmap.Global.Companion.fileIsValidZip
+import com.mirenkov.ktheightmap.Global.Companion.zipContainsSQLite
 import com.mirenkov.ktheightmap.parser.KhmParser
 import com.mirenkov.ktheightmap.parser.SasJPEGParser
 import com.mirenkov.ktheightmap.parser.SasSQLiteParser
@@ -66,50 +71,78 @@ class SettingsActivity : ComponentActivity() {
 fun SettingsMain(vm: TileViewModel, launcher: ActivityResultLauncher<DocumentFilePickerConfig?>) {
 
     val coroutineScope = rememberCoroutineScope()
+
     val filePath by remember { FileLoader.filePath }
+    val pathIsNotNull = filePath != null
+    val pathIsValidKhm = pathIsNotNull && KhmParser.isFileValid(filePath!!)
+    val pathIsValidZip = pathIsNotNull && fileIsValidZip(filePath!!)
+    val pathContainsSQLite = pathIsValidZip && zipContainsSQLite(filePath!!)
+
+    var launcherActive by remember { FileLoader.launcherActive }
+    var showLoading by remember { mutableStateOf(false) }
+
     val ctx = LocalContext.current
+
+    var enableClearTiles by remember { mutableStateOf(vm.repository.containsTiles()) }
+    var enableClearHeight by remember { mutableStateOf(KhmParser.fileExists(ctx)) }
+
     val loadToast = Toast.makeText(ctx, "File successfully loaded.", Toast.LENGTH_LONG)
     val clearTilesToast = Toast.makeText(ctx, "Tiles removed from database.", Toast.LENGTH_LONG)
     val clearHeightToast = Toast.makeText(ctx, "Height data removed.", Toast.LENGTH_LONG)
+
+    val selectedFileText = if (pathIsNotNull) filePath!!.split('/').last() else "none"
+
     val fileSelectorRow = @Composable () {
         Row(Modifier.fillMaxWidth()) {
-                Button({ launcher.launch(null) }) { Text("Select") }
-                Text("Selected file: none", Modifier.padding(8.dp, 0.dp).align(Alignment.CenterVertically))
+            Button({ launcher.launch(null); launcherActive = true }) { Text("Select") }
+            Text("Selected file: $selectedFileText", Modifier.padding(8.dp, 0.dp).align(Alignment.CenterVertically))
         }
     }
+
     KtHeightMapTheme {
-        Scaffold { paddingValues ->
+        Scaffold(floatingActionButton = { if (showLoading || launcherActive) CircularProgressIndicator() }) { paddingValues ->
             Column(Modifier.padding(paddingValues)) {
                 LabeledSection("Select file:", Modifier.padding(24.dp, 8.dp)) {
                     fileSelectorRow()
                 }
                 LabeledSection("Load file as...", Modifier.padding(24.dp, 8.dp)) {
                     Button({ filePath?.let {
+                        showLoading = true
                         coroutineScope.launch(Dispatchers.IO) {
                             SasSQLiteParser.processZip(it, vm.repository, ctx)
-                            coroutineScope.launch(Dispatchers.Main) { loadToast.show() }
+                            enableClearTiles = true
+                            coroutineScope.launch(Dispatchers.Main) { loadToast.show(); showLoading = false }
                         }
-                    } }) { Text("SQLite (.zip)") }
+                    } }, enabled = pathContainsSQLite) { Text("SQLite (.zip)") }
                     Button({ filePath?.let {
+                        showLoading = true
                         coroutineScope.launch(Dispatchers.IO) {
                             SasJPEGParser.processZip(it, vm.repository)
-                            coroutineScope.launch(Dispatchers.Main) { loadToast.show() }
+                            enableClearTiles = true
+                            coroutineScope.launch(Dispatchers.Main) { loadToast.show(); showLoading = false }
                         }
-                    } }) { Text("JPEG (.zip)") }
+                    } }, enabled = pathIsValidZip && !pathContainsSQLite) { Text("JPEG (.zip)") }
                     Button({ filePath?.let {
+                        showLoading = true
+                        coroutineScope.launch(Dispatchers.IO) {
                             KhmParser.load(it, ctx)
-                        loadToast.show()
-                    } }) { Text("Height data (.khm)") }
+                            enableClearHeight = true
+                            coroutineScope.launch(Dispatchers.Main) { loadToast.show(); showLoading = false }
+                        }
+                    } }, enabled = pathIsValidKhm) { Text("Height data (.khm)") }
                 }
                 LabeledSection("Clear...", Modifier.padding(24.dp, 8.dp)) {
                     Button({ coroutineScope.launch {
+                        showLoading = true
                         vm.repository.clearTiles()
-                        clearTilesToast.show()
-                    } }) { Text("Tile data") }
+                        enableClearTiles = false
+                        coroutineScope.launch(Dispatchers.Main) { clearTilesToast.show(); showLoading = false }
+                    } }, enabled = enableClearTiles) { Text("Tile data") }
                     Button({
                         KhmParser.clear(ctx)
+                        enableClearHeight = false
                         clearHeightToast.show()
-                    }) { Text("Height data") }
+                    }, enabled = enableClearHeight) { Text("Height data") }
                 }
             }
         }

app/src/main/java/com/mirenkov/ktheightmap/TileRepository.kt

@@ -25,4 +25,8 @@ class TileRepository(private val tileDao: TileDao) {
     fun getMaxLevel(): Int {
         return coroutineScope.future(Dispatchers.IO){ tileDao.maxLevel() }.join() ?: 2
     }
+
+    fun containsTiles(): Boolean {
+        return coroutineScope.future(Dispatchers.IO){ tileDao.maxLevel() }.join() != null
+    }
 }

app/src/main/java/com/mirenkov/ktheightmap/TileViewModel.kt

@@ -7,8 +7,8 @@ import androidx.compose.runtime.mutableIntStateOf
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.ui.text.input.TextFieldValue
 import androidx.lifecycle.ViewModel
-import com.mirenkov.ktheightmap.Config.Companion.MAP_START_OFFSET_X
-import com.mirenkov.ktheightmap.Config.Companion.MAP_START_OFFSET_Y
+import com.mirenkov.ktheightmap.Global.Companion.MAP_START_OFFSET_X
+import com.mirenkov.ktheightmap.Global.Companion.MAP_START_OFFSET_Y
 
 class TileViewModel(application: Application): ViewModel() {
     val repository: TileRepository

app/src/main/java/com/mirenkov/ktheightmap/parser/KhmParser.kt

@@ -3,6 +3,7 @@ package com.mirenkov.ktheightmap.parser
 import android.content.Context
 import java.io.DataInputStream
 import java.io.FileInputStream
+import kotlin.math.abs
 import kotlin.math.max
 import kotlin.math.min
 
@@ -21,27 +22,48 @@ class KhmParser {
         const val HEIGHT_FILE: String = "height.khm"
 
         fun load(filePath: String, ctx: Context) {
-            if (ctx.getFileStreamPath(HEIGHT_FILE).exists()) {
+            if (fileExists(ctx)) {
                 return
             }
 
             val inp = FileInputStream(filePath)
+
+            if (checkHeader(inp))
                 ctx.openFileOutput(HEIGHT_FILE, Context.MODE_PRIVATE).use {
                     it.write(inp.readBytes())
                 }
             inp.close()
         }
 
+        fun isFileValid(filePath: String): Boolean {
+            FileInputStream(filePath).use {
+                return checkHeader(it)
+            }
+        }
+
         fun clear(ctx: Context) {
-            if (ctx.getFileStreamPath(HEIGHT_FILE).exists()) {
+            if (fileExists(ctx)) {
                 assert(ctx.deleteFile(HEIGHT_FILE))
             }
         }
 
+        fun fileExists(ctx: Context): Boolean {
+            return (ctx.getFileStreamPath(HEIGHT_FILE).exists())
+        }
+
         private fun getOffset(header: HeightInfo, x: Int, y: Int): Int {
             return (x * header.width + y) * 2
         }
 
+        // NOTE: this function only checks if values are in accepted ranges
+        private fun checkHeader(fis: FileInputStream): Boolean {
+            header = null
+            readHeader(DataInputStream(fis))
+            return abs(header!!.latPerValue) < abs(header!!.minLat) &&
+                    abs(header!!.lonPerValue) < abs(header!!.minLon) &&
+                    header!!.width > 0 && header!!.height > 0
+        }
+
         private fun readHeader(dis: DataInputStream): HeightInfo {
             if (header == null) {
                 header = with(dis) {
@@ -70,7 +92,7 @@ class KhmParser {
         }
 
         fun getHeight(lon: Float, lat: Float, ctx: Context): UShort {
-            if (!ctx.getFileStreamPath(HEIGHT_FILE).exists())
+            if (!fileExists(ctx))
                 return 0u.toUShort()
             val dis = DataInputStream(ctx.openFileInput(HEIGHT_FILE))
             dis.use {