Add ExportModule

It is writing the exported sets.csv correctly,
however afterwards the device has no access to
any files on it's system anymore.

App.tsx

@@ -6,7 +6,7 @@ import {
   NavigationContainer,
 } from '@react-navigation/native';
 import React, {useEffect} from 'react';
-import {StatusBar, useColorScheme} from 'react-native';
+import {NativeModules, StatusBar, useColorScheme} from 'react-native';
 import {setupSchema} from './db';
 import Exercises from './Exercises';
 import Home from './Home';
@@ -28,6 +28,7 @@ const App = () => {
     AsyncStorage.getItem('minutes').then(async minutes => {
       if (!minutes) await AsyncStorage.setItem('minutes', '3');
     });
+    console.log(NativeModules.ExportModule.sets());
   }, []);
 
   return (

android/app/src/main/AndroidManifest.xml

@@ -5,6 +5,7 @@
     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
     <uses-permission android:name="android.permission.WAKE_LOCK" />
     <uses-permission android:name="android.permission.SCHEDULE_EXACT_ALARM" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 
     <application
         android:name=".MainApplication"

android/app/src/main/java/com/massive/ExportModule.kt

@@ -0,0 +1,86 @@
+package com.massive
+
+import android.annotation.SuppressLint
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.app.PendingIntent
+import android.content.Intent
+import android.os.Build
+import android.os.Environment
+import android.provider.DocumentsContract
+import android.util.Log
+import androidx.annotation.RequiresApi
+import androidx.core.app.NotificationCompat
+import androidx.core.app.NotificationManagerCompat
+import com.facebook.react.bridge.ReactApplicationContext
+import com.facebook.react.bridge.ReactContextBaseJavaModule
+import com.facebook.react.bridge.ReactMethod
+import okhttp3.internal.notify
+import java.io.File
+import java.time.LocalDateTime
+import java.time.format.DateTimeFormatter
+
+class ExportModule internal constructor(context: ReactApplicationContext?) :
+    ReactContextBaseJavaModule(context) {
+    override fun getName(): String {
+        return "ExportModule"
+    }
+
+    @RequiresApi(Build.VERSION_CODES.O)
+    @SuppressLint("Recycle", "Range")
+    @ReactMethod(isBlockingSynchronousMethod = true)
+    fun sets(): String {
+        Log.d("ExportModule", "Exporting sets...")
+        val dir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)
+        val current = LocalDateTime.now()
+        val formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd")
+        val formatted = current.format(formatter)
+        val sets = File(dir, "sets$formatted.csv")
+        sets.createNewFile()
+        sets.setWritable(true)
+        sets.setReadable(true)
+        sets.writeText("id,name,reps,weight,created,unit\n")
+        val db = MassiveHelper(reactApplicationContext).readableDatabase
+        db.use {
+            with (it.query("sets", null, null, null, null, null, null)) {
+                while (moveToNext()) {
+                    val id = getInt(getColumnIndex("id"))
+                    val name = getString(getColumnIndex("name"))
+                    val reps = getInt(getColumnIndex("reps"))
+                    val weight = getInt(getColumnIndex("weight"))
+                    val created = getString(getColumnIndex("created"))
+                    val unit = getString(getColumnIndex("unit"))
+                    sets.appendText("$id,$name,$reps,$weight,$created,$unit\n")
+                }
+            }
+        }
+
+        val notificationManager = NotificationManagerCompat.from(reactApplicationContext)
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            val importance = NotificationManager.IMPORTANCE_LOW
+            val channel = NotificationChannel(CHANNEL_ID, CHANNEL_ID, importance)
+            channel.description = "Alarms for rest timings."
+            notificationManager.createNotificationChannel(channel)
+        }
+
+        val contentIntent = Intent(Intent.ACTION_OPEN_DOCUMENT).apply {
+            addCategory(Intent.CATEGORY_OPENABLE)
+            type = "text/csv"
+        }
+        val pendingContent =
+            PendingIntent.getActivity(reactApplicationContext, 0, contentIntent, PendingIntent.FLAG_IMMUTABLE)
+        val builder = NotificationCompat.Builder(reactApplicationContext, CHANNEL_ID)
+            .setSmallIcon(R.drawable.ic_baseline_arrow_downward_24)
+            .setContentTitle("Downloaded sets")
+            .setContentIntent(pendingContent)
+            .setAutoCancel(true)
+        notificationManager.notify(NOTIFICATION_ID, builder.build())
+
+        return sets.absolutePath
+    }
+
+    companion object {
+        private const val CHANNEL_ID = "Exports"
+        private const val NOTIFICATION_ID = 2
+    }
+}

android/app/src/main/java/com/massive/MainApplication.kt

@@ -18,7 +18,7 @@ class MainApplication : Application(), ReactApplication {
         override fun getPackages(): List<ReactPackage> {
             val packages: MutableList<ReactPackage> = PackageList(this).packages
             packages.add(SQLitePluginPackage())
-            packages.add(AlarmPackage())
+            packages.add(MassivePackage())
             return packages
         }
 

android/app/src/main/java/com/massive/MassiveHelper.kt

@@ -0,0 +1,15 @@
+package com.massive
+
+import android.content.Context
+import android.database.sqlite.SQLiteDatabase
+import android.database.sqlite.SQLiteOpenHelper
+
+class MassiveHelper(context: Context) : SQLiteOpenHelper(context, "massive.db", null, 1) {
+    override fun onCreate(db: SQLiteDatabase) {
+        return
+    }
+
+    override fun onUpgrade(p0: SQLiteDatabase?, p1: Int, p2: Int) {
+        return
+    }
+}

android/app/src/main/java/com/massive/MassivePackage.kt

@@ -7,7 +7,7 @@ import com.facebook.react.uimanager.ViewManager
 import com.massive.AlarmModule
 import java.util.ArrayList
 
-class AlarmPackage : ReactPackage {
+class MassivePackage : ReactPackage {
     override fun createViewManagers(reactContext: ReactApplicationContext): List<ViewManager<*, *>> {
         return emptyList()
     }
@@ -17,6 +17,7 @@ class AlarmPackage : ReactPackage {
     ): List<NativeModule> {
         val modules: MutableList<NativeModule> = ArrayList()
         modules.add(AlarmModule(reactContext))
+        modules.add(ExportModule(reactContext))
         return modules
     }
 }

android/app/src/main/java/com/massive/TimerService.kt

@@ -86,7 +86,7 @@ class TimerService : Service() {
     }
 
     companion object {
-        private const val CHANNEL_ID = "MassiveAlarm"
+        private const val CHANNEL_ID = "Alarms"
         private const val ALARM_ID = 1
     }
 }

android/app/src/main/res/drawable/ic_baseline_arrow_downward_24.xml

@@ -0,0 +1,5 @@
+<vector android:height="24dp" android:tint="#000000"
+    android:viewportHeight="24" android:viewportWidth="24"
+    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="@android:color/white" android:pathData="M20,12l-1.41,-1.41L13,16.17V4h-2v12.17l-5.58,-5.59L4,12l8,8 8,-8z"/>
+</vector>