[DO NOT USE] Implement DownloadScreen part 1

app/src/main/java/com/hippo/ehviewer/ui/settings/DownloadScreen.kt

@@ -1,5 +1,9 @@
 package com.hippo.ehviewer.ui.settings
 
+import android.content.Intent.FLAG_GRANT_READ_URI_PERMISSION
+import android.content.Intent.FLAG_GRANT_WRITE_URI_PERMISSION
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.padding
 import androidx.compose.material.icons.Icons
@@ -7,20 +11,34 @@ import androidx.compose.material.icons.filled.ArrowBack
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
 import androidx.compose.material3.Scaffold
+import androidx.compose.material3.SnackbarHost
+import androidx.compose.material3.SnackbarHostState
 import androidx.compose.material3.Text
 import androidx.compose.material3.TopAppBar
 import androidx.compose.material3.TopAppBarDefaults
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.input.nestedscroll.nestedScroll
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
 import com.hippo.ehviewer.R
+import com.hippo.ehviewer.download.downloadLocation
+import com.hippo.ehviewer.ui.keepNoMediaFileStatus
 import com.hippo.ehviewer.ui.login.LocalNavController
+import com.hippo.unifile.UniFile
+import eu.kanade.tachiyomi.util.lang.launchNonCancellable
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
 
 @Composable
 fun DownloadScreen() {
     val navController = LocalNavController.current
     val scrollBehavior = TopAppBarDefaults.pinnedScrollBehavior()
+    val context = LocalContext.current
+    val coroutineScope = rememberCoroutineScope { Dispatchers.IO }
+    val snackbarHostState = remember { SnackbarHostState() }
     Scaffold(
         topBar = {
             TopAppBar(
@@ -33,8 +51,31 @@ fun DownloadScreen() {
                 scrollBehavior = scrollBehavior,
             )
         },
+        snackbarHost = { SnackbarHost(snackbarHostState) },
     ) {
+        val cannotGetDownloadLocation = stringResource(id = R.string.settings_download_cant_get_download_location)
+        val selectDownloadDirLauncher = rememberLauncherForActivityResult(ActivityResultContracts.OpenDocumentTree()) { treeUri ->
+            treeUri?.run {
+                coroutineScope.launch {
+                    context.runCatching {
+                        contentResolver.takePersistableUriPermission(treeUri, FLAG_GRANT_READ_URI_PERMISSION or FLAG_GRANT_WRITE_URI_PERMISSION)
+                        UniFile.fromTreeUri(context, treeUri)!!.run {
+                            downloadLocation = this
+                            coroutineScope.launchNonCancellable {
+                                keepNoMediaFileStatus()
+                            }
+                        }
+                    }.onFailure {
+                        snackbarHostState.showSnackbar(cannotGetDownloadLocation)
+                    }
+                }
+            }
+        }
         Column(modifier = Modifier.padding(it).nestedScroll(scrollBehavior.nestedScrollConnection)) {
+            Preference(
+                title = stringResource(id = R.string.settings_download_download_location),
+                summary = downloadLocation.uri.toString(),
+            ) { selectDownloadDirLauncher.launch(downloadLocation.uri) }
         }
     }
 }