Add sleep tracking, statistics module and backup features

Features:
- Sleep tracking with timer and manual duration input
- Statistics module with 5 tabs (daily summary, feeding, diapers, sleep, growth)
- Export/Import backup functionality in settings
- Complete German, French and Italian translations

app/src/main/java/it/danieleverducci/lunatracker/SettingsActivity.kt

@@ -1,20 +1,26 @@
 package it.danieleverducci.lunatracker
 
+import android.net.Uri
 import android.os.Bundle
 import android.view.View
 import android.widget.EditText
 import android.widget.RadioButton
 import android.widget.TextView
 import android.widget.Toast
+import androidx.activity.result.contract.ActivityResultContracts
 import androidx.appcompat.app.AppCompatActivity
 import com.google.android.material.progressindicator.LinearProgressIndicator
 import com.google.android.material.switchmaterial.SwitchMaterial
 import com.thegrizzlylabs.sardineandroid.impl.SardineException
+import it.danieleverducci.lunatracker.entities.Logbook
+import it.danieleverducci.lunatracker.entities.LunaEvent
 import it.danieleverducci.lunatracker.repository.FileLogbookRepository
 import it.danieleverducci.lunatracker.repository.LocalSettingsRepository
 import it.danieleverducci.lunatracker.repository.LogbookListObtainedListener
 import it.danieleverducci.lunatracker.repository.WebDAVLogbookRepository
 import okio.IOException
+import org.json.JSONArray
+import org.json.JSONObject
 
 open class SettingsActivity : AppCompatActivity() {
     protected lateinit var settingsRepository: LocalSettingsRepository
@@ -27,6 +33,15 @@ open class SettingsActivity : AppCompatActivity() {
     protected lateinit var switchNoBreastfeeding: SwitchMaterial
     protected lateinit var textViewSignature: EditText
 
+    // Activity Result Launchers for Export/Import
+    private val exportLauncher = registerForActivityResult(
+        ActivityResultContracts.CreateDocument("application/json")
+    ) { uri -> uri?.let { exportLogbookToUri(it) } }
+
+    private val importLauncher = registerForActivityResult(
+        ActivityResultContracts.OpenDocument()
+    ) { uri -> uri?.let { importLogbookFromUri(it) } }
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
@@ -46,6 +61,12 @@ open class SettingsActivity : AppCompatActivity() {
         findViewById<View>(R.id.settings_cancel).setOnClickListener({
             finish()
         })
+        findViewById<View>(R.id.settings_export).setOnClickListener({
+            startExport()
+        })
+        findViewById<View>(R.id.settings_import).setOnClickListener({
+            startImport()
+        })
 
         settingsRepository = LocalSettingsRepository(this)
         loadSettings()
@@ -198,4 +219,136 @@ open class SettingsActivity : AppCompatActivity() {
         fun onCopyLocalLogbooksToWebdavFinished(errors: String?)
     }
 
+    // Export/Import functionality
+    private fun startExport() {
+        val timestamp = java.text.SimpleDateFormat("yyyyMMdd_HHmmss", java.util.Locale.US)
+            .format(java.util.Date())
+        exportLauncher.launch("lunatracker_backup_$timestamp.json")
+    }
+
+    private fun startImport() {
+        importLauncher.launch(arrayOf("application/json"))
+    }
+
+    private fun exportLogbookToUri(uri: Uri) {
+        progressIndicator.visibility = View.VISIBLE
+        Thread {
+            try {
+                val fileLogbookRepo = FileLogbookRepository()
+                val logbooks = fileLogbookRepo.getAllLogbooks(this)
+
+                val json = JSONObject().apply {
+                    put("version", 1)
+                    put("app", "LunaTracker")
+                    put("exported_at", System.currentTimeMillis())
+                    put("logbooks", JSONArray().apply {
+                        logbooks.forEach { logbook ->
+                            put(JSONObject().apply {
+                                put("name", logbook.name)
+                                put("events", JSONArray().apply {
+                                    logbook.logs.forEach { event ->
+                                        put(event.toJson())
+                                    }
+                                })
+                            })
+                        }
+                    })
+                }
+
+                contentResolver.openOutputStream(uri)?.use { outputStream ->
+                    outputStream.write(json.toString(2).toByteArray(Charsets.UTF_8))
+                }
+
+                val eventCount = logbooks.sumOf { it.logs.size }
+                runOnUiThread {
+                    progressIndicator.visibility = View.INVISIBLE
+                    Toast.makeText(
+                        this,
+                        getString(R.string.export_success, eventCount),
+                        Toast.LENGTH_SHORT
+                    ).show()
+                }
+            } catch (e: Exception) {
+                runOnUiThread {
+                    progressIndicator.visibility = View.INVISIBLE
+                    Toast.makeText(
+                        this,
+                        getString(R.string.export_error) + e.message,
+                        Toast.LENGTH_SHORT
+                    ).show()
+                }
+            }
+        }.start()
+    }
+
+    private fun importLogbookFromUri(uri: Uri) {
+        progressIndicator.visibility = View.VISIBLE
+        Thread {
+            try {
+                val jsonString = contentResolver.openInputStream(uri)?.bufferedReader()?.readText()
+                    ?: throw Exception("Could not read file")
+
+                val json = JSONObject(jsonString)
+                val version = json.optInt("version", 1)
+
+                val fileLogbookRepo = FileLogbookRepository()
+                var totalEvents = 0
+
+                if (json.has("logbooks")) {
+                    // New format with multiple logbooks
+                    val logbooksArray = json.getJSONArray("logbooks")
+                    for (i in 0 until logbooksArray.length()) {
+                        val logbookJson = logbooksArray.getJSONObject(i)
+                        val name = logbookJson.optString("name", "")
+                        val eventsArray = logbookJson.getJSONArray("events")
+
+                        val logbook = Logbook(name)
+                        for (j in 0 until eventsArray.length()) {
+                            try {
+                                logbook.logs.add(LunaEvent(eventsArray.getJSONObject(j)))
+                                totalEvents++
+                            } catch (e: IllegalArgumentException) {
+                                // Skip invalid events
+                            }
+                        }
+                        fileLogbookRepo.saveLogbook(this, logbook)
+                    }
+                } else if (json.has("events")) {
+                    // Old format with single logbook
+                    val name = json.optString("logbook_name", "")
+                    val eventsArray = json.getJSONArray("events")
+
+                    val logbook = Logbook(name)
+                    for (i in 0 until eventsArray.length()) {
+                        try {
+                            logbook.logs.add(LunaEvent(eventsArray.getJSONObject(i)))
+                            totalEvents++
+                        } catch (e: IllegalArgumentException) {
+                            // Skip invalid events
+                        }
+                    }
+                    fileLogbookRepo.saveLogbook(this, logbook)
+                }
+
+                runOnUiThread {
+                    progressIndicator.visibility = View.INVISIBLE
+                    Toast.makeText(
+                        this,
+                        getString(R.string.import_success, totalEvents),
+                        Toast.LENGTH_SHORT
+                    ).show()
+                }
+            } catch (e: Exception) {
+                runOnUiThread {
+                    progressIndicator.visibility = View.INVISIBLE
+                    Toast.makeText(
+                        this,
+                        getString(R.string.import_error) + ": " + e.message,
+                        Toast.LENGTH_LONG
+                    ).show()
+                }
+            }
+        }.start()
+    }
+
 }