common/app: add Settings UI composables

Co-authored-by: Harsh Shandilya <me@msfjarvis.dev>
Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

app/src/main/java/dev/msfjarvis/lobsters/ui/settings/Options.kt

@@ -0,0 +1,58 @@
+package dev.msfjarvis.lobsters.ui.settings
+
+import android.content.Context
+import androidx.activity.compose.registerForActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.runtime.Composable
+import dev.msfjarvis.lobsters.data.backup.BackupHandler
+import dev.msfjarvis.lobsters.utils.Strings
+import dev.msfjarvis.lobsters.utils.get
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+
+private const val JSON_MINE = "application/json"
+
+@Composable
+fun BackupOption(
+  context: Context,
+  backupHandler: BackupHandler,
+  coroutineScope: CoroutineScope,
+) {
+  val result =
+    registerForActivityResult(ActivityResultContracts.CreateDocument()) { uri ->
+      if (uri == null) return@registerForActivityResult
+      context.contentResolver.openOutputStream(uri)?.use {
+        coroutineScope.launch(Dispatchers.IO) {
+          it.write(backupHandler.exportSavedPosts().toByteArray(Charsets.UTF_8))
+        }
+      }
+    }
+  SettingsActionItem(
+    Strings.SettingsBackup.get(),
+    Strings.SettingsBackupDescription.get(),
+    onClick = { result.launch("Claw-export.json") }
+  )
+}
+
+@Composable
+fun RestoreOption(
+  context: Context,
+  backupHandler: BackupHandler,
+  coroutineScope: CoroutineScope,
+) {
+  val result =
+    registerForActivityResult(ActivityResultContracts.GetContent()) { uri ->
+      if (uri == null) return@registerForActivityResult
+      context.contentResolver.openInputStream(uri)?.use {
+        coroutineScope.launch(Dispatchers.IO) {
+          backupHandler.importSavedPosts(it.readBytes().toString(Charsets.UTF_8))
+        }
+      }
+    }
+  SettingsActionItem(
+    title = Strings.SettingsRestore.get(),
+    description = Strings.SettingsRestoreDescription.get(),
+    onClick = { result.launch(JSON_MINE) }
+  )
+}

app/src/main/java/dev/msfjarvis/lobsters/ui/settings/Settings.kt

@@ -0,0 +1,95 @@
+package dev.msfjarvis.lobsters.ui.settings
+
+import android.content.Context
+import androidx.activity.ComponentActivity
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.material.Icon
+import androidx.compose.material.ListItem
+import androidx.compose.material.Scaffold
+import androidx.compose.material.Text
+import androidx.compose.material.TopAppBar
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.ArrowBack
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.unit.dp
+import dev.msfjarvis.lobsters.data.backup.BackupHandler
+import dev.msfjarvis.lobsters.utils.Strings
+import dev.msfjarvis.lobsters.utils.get
+import kotlinx.coroutines.CoroutineScope
+
+@Composable
+fun LobstersSettings(
+  backupHandler: BackupHandler,
+) {
+  val context = LocalContext.current
+  val scope = rememberCoroutineScope()
+  Scaffold(
+    topBar = { SettingsTopBar(context) },
+    content = { SettingsBody(context, backupHandler, scope) },
+  )
+}
+
+@Composable
+fun SettingsTopBar(
+  context: Context,
+) {
+  TopAppBar(
+    title = { Text(Strings.Settings.get()) },
+    navigationIcon = {
+      Icon(
+        Icons.Default.ArrowBack,
+        contentDescription = Strings.Settings.get(),
+        modifier =
+          Modifier.padding(start = 16.dp).clickable { (context as ComponentActivity).finish() },
+      )
+    },
+  )
+}
+
+@Composable
+fun SettingsBody(
+  context: Context,
+  backupHandler: BackupHandler,
+  scope: CoroutineScope,
+) {
+  LazyColumn {
+    item {
+      BackupOption(
+        context,
+        backupHandler,
+        scope,
+      )
+    }
+    item {
+      RestoreOption(
+        context,
+        backupHandler,
+        scope,
+      )
+    }
+  }
+}
+
+@Composable
+fun SettingsActionItem(
+  title: String,
+  description: String? = null,
+  singleLineDescription: Boolean = true,
+  icon: ImageVector? = null,
+  onClick: (() -> Unit)? = null,
+) {
+  ListItem(
+    text = { Text(title) },
+    secondaryText = { description?.let { Text(it) } },
+    icon = { icon?.let { Icon(icon, null, Modifier.height(32.dp)) } },
+    singleLineSecondaryText = singleLineDescription,
+    modifier = Modifier.clickable { onClick?.invoke() },
+  )
+}