fix: integrate backend with android and rearrange signup and complete profile flows

android/app/build.gradle

@@ -22,7 +22,13 @@ android {
     }
 
     buildTypes {
+        debug {
+            // Emulator ile local backend geliştirme
+            buildConfigField 'String', 'API_BASE_URL', '"http://10.0.2.2:3000/api"'
+        }
         release {
+            // Demo günü Railway/public backend URL buraya gelecek
+            buildConfigField 'String', 'API_BASE_URL', '"https://YOUR-RAILWAY-DOMAIN/api"'
             minifyEnabled false
             proguardFiles(
                 getDefaultProguardFile('proguard-android-optimize.txt'),
@@ -38,6 +44,7 @@ android {
 
     buildFeatures {
         compose true
+        buildConfig true
     }
 
     packaging {
@@ -50,7 +57,6 @@ android {
 dependencies {
     def composeBom = platform('androidx.compose:compose-bom:2026.03.00')
 
-    implementation 'androidx.navigation:navigation-compose:2.9.7'
     implementation composeBom
     androidTestImplementation composeBom
 

android/app/src/debug/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <application
+        android:usesCleartextTraffic="true" />
+
+</manifest>

android/app/src/main/AndroidManifest.xml

@@ -1,6 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
+    <uses-permission android:name="android.permission.INTERNET" />
+
     <application
         android:allowBackup="true"
         android:label="@string/app_name"

android/app/src/main/java/com/neph/MainActivity.kt

@@ -6,13 +6,17 @@ import androidx.activity.compose.setContent
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.navigation.compose.rememberNavController
+import com.neph.features.auth.data.AuthSessionStore
+import com.neph.features.profile.data.ProfileRepository
 import com.neph.navigation.AppNavGraph
 import com.neph.navigation.Routes
 import com.neph.ui.theme.NephTheme
 
 class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        AuthSessionStore.initialize(applicationContext)
+        ProfileRepository.initialize(applicationContext)
         setContent {
             NephApp()
         }
@@ -25,7 +29,11 @@ fun NephApp() {
         val navController = rememberNavController()
         AppNavGraph(
             navController = navController,
-            startDestination = Routes.Welcome.route
+            startDestination = if (AuthSessionStore.getAccessToken().isNullOrBlank()) {
+                Routes.Welcome.route
+            } else {
+                Routes.Profile.route
+            }
         )
     }
 }

android/app/src/main/java/com/neph/core/network/ApiException.kt

@@ -0,0 +1,7 @@
+package com.neph.core.network
+
+class ApiException(
+    override val message: String,
+    val status: Int,
+    val code: String? = null
+) : Exception(message)

android/app/src/main/java/com/neph/core/network/JsonHttpClient.kt

@@ -0,0 +1,130 @@
+package com.neph.core.network
+
+import com.neph.BuildConfig
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import org.json.JSONException
+import org.json.JSONObject
+import java.io.IOException
+import java.net.HttpURLConnection
+import java.net.URL
+import java.net.UnknownHostException
+
+object JsonHttpClient {
+    private const val ConnectTimeoutMillis = 15_000
+    private const val ReadTimeoutMillis = 20_000
+
+    suspend fun request(
+        path: String,
+        method: String = "GET",
+        body: JSONObject? = null,
+        token: String? = null
+    ): JSONObject = withContext(Dispatchers.IO) {
+        val connection = (URL(buildUrl(path)).openConnection() as HttpURLConnection).apply {
+            requestMethod = method
+            connectTimeout = ConnectTimeoutMillis
+            readTimeout = ReadTimeoutMillis
+            doInput = true
+            setRequestProperty("Accept", "application/json")
+
+            if (!token.isNullOrBlank()) {
+                setRequestProperty("Authorization", "Bearer ${token.trim()}")
+            }
+
+            if (body != null) {
+                doOutput = true
+                setRequestProperty("Content-Type", "application/json")
+            }
+        }
+
+        try {
+            if (body != null) {
+                connection.outputStream.use { output ->
+                    output.write(body.toString().toByteArray(Charsets.UTF_8))
+                }
+            }
+
+            val status = connection.responseCode
+            val raw = readText(
+                if (status in 200..299) connection.inputStream else connection.errorStream
+            )
+
+            if (status !in 200..299) {
+                throw buildApiException(status, raw)
+            }
+
+            if (raw.isBlank()) {
+                return@withContext JSONObject()
+            }
+
+            try {
+                JSONObject(raw)
+            } catch (_: JSONException) {
+                throw ApiException(
+                    message = "Unexpected server response.",
+                    status = status,
+                    code = "INVALID_RESPONSE"
+                )
+            }
+        } catch (error: ApiException) {
+            throw error
+        } catch (_: UnknownHostException) {
+            throw ApiException(
+                message = "Could not reach the server. Please check your connection and try again.",
+                status = 0,
+                code = "NETWORK_ERROR"
+            )
+        } catch (_: IOException) {
+            throw ApiException(
+                message = "Could not reach the server. Please check your connection and try again.",
+                status = 0,
+                code = "NETWORK_ERROR"
+            )
+        } finally {
+            connection.disconnect()
+        }
+    }
+
+    private fun buildUrl(path: String): String {
+        val normalizedBase = BuildConfig.API_BASE_URL.removeSuffix("/")
+        val normalizedPath = if (path.startsWith("/")) path else "/$path"
+        return "$normalizedBase$normalizedPath"
+    }
+
+    private fun readText(stream: java.io.InputStream?): String {
+        if (stream == null) {
+            return ""
+        }
+
+        return stream.bufferedReader(Charsets.UTF_8).use { it.readText() }
+    }
+
+    private fun buildApiException(status: Int, raw: String): ApiException {
+        if (raw.isBlank()) {
+            return ApiException(message = "Request failed.", status = status)
+        }
+
+        return try {
+            val json = JSONObject(raw)
+            ApiException(
+                message = extractErrorMessage(json),
+                status = status,
+                code = json.optString("code").takeIf { it.isNotBlank() }
+            )
+        } catch (_: JSONException) {
+            ApiException(message = raw.trim(), status = status)
+        }
+    }
+
+    private fun extractErrorMessage(json: JSONObject): String {
+        val directKeys = listOf("message", "detail", "error")
+        for (key in directKeys) {
+            val value = json.optString(key)
+            if (value.isNotBlank()) {
+                return value
+            }
+        }
+
+        return "Request failed."
+    }
+}

android/app/src/main/java/com/neph/features/auth/data/AuthRepository.kt

@@ -0,0 +1,160 @@
+package com.neph.features.auth.data
+
+import com.neph.core.network.ApiException
+import com.neph.core.network.JsonHttpClient
+import com.neph.features.profile.data.ProfileData
+import com.neph.features.profile.data.ProfileRepository
+import org.json.JSONObject
+import java.net.URLEncoder
+import kotlinx.coroutines.CancellationException
+
+enum class LoginDestination {
+    PROFILE,
+    COMPLETE_PROFILE
+}
+
+object AuthRepository {
+    suspend fun signup(
+        email: String,
+        password: String,
+        acceptedTerms: Boolean
+    ): String {
+        val normalizedEmail = email.trim()
+        val response = JsonHttpClient.request(
+            path = "/auth/signup",
+            method = "POST",
+            body = JSONObject()
+                .put("email", normalizedEmail)
+                .put("password", password)
+                .put("acceptedTerms", acceptedTerms)
+        )
+
+        AuthSessionStore.setPendingVerificationEmail(normalizedEmail)
+        ProfileRepository.clearProfile()
+        ProfileRepository.saveProfile(
+            ProfileData(
+                email = normalizedEmail
+            )
+        )
+
+        return response.optString("message").ifBlank {
+            "Account created successfully. Please verify your email."
+        }
+    }
+
+    suspend fun login(
+        email: String,
+        password: String,
+        rememberMe: Boolean
+    ): LoginDestination {
+        val normalizedEmail = email.trim()
+        val response = JsonHttpClient.request(
+            path = "/auth/login",
+            method = "POST",
+            body = JSONObject()
+                .put("email", normalizedEmail)
+                .put("password", password)
+        )
+
+        val accessToken = response.optString("accessToken")
+        if (accessToken.isBlank()) {
+            throw ApiException(
+                message = "Login succeeded but no access token was returned.",
+                status = 200,
+                code = "INVALID_RESPONSE"
+            )
+        }
+
+        val user = response.optJSONObject("user")
+        val userEmail = user?.optString("email")?.ifBlank { normalizedEmail } ?: normalizedEmail
+
+        AuthSessionStore.saveAccessToken(accessToken, rememberMe)
+        ProfileRepository.clearProfile()
+        ProfileRepository.saveProfile(
+            ProfileData(email = userEmail)
+        )
+
+        return try {
+            ProfileRepository.fetchAndCacheRemoteProfile()
+            AuthSessionStore.clearPendingVerificationEmail()
+            LoginDestination.PROFILE
+        } catch (cancellationException: CancellationException) {
+            throw cancellationException
+        } catch (error: ApiException) {
+            when (error.status) {
+                404 -> {
+                    AuthSessionStore.clearPendingVerificationEmail()
+                    LoginDestination.COMPLETE_PROFILE
+                }
+                401 -> {
+                    AuthSessionStore.clearAccessToken()
+                    ProfileRepository.clearProfile()
+                    throw error
+                }
+                else -> {
+                    throw error
+                }
+            }
+        } catch (error: Exception) {
+            throw error
+        }
+    }
+
+    suspend fun verifyEmail(tokenOrLink: String): String {
+        val token = extractVerificationToken(tokenOrLink)
+        val encodedToken = URLEncoder.encode(token, Charsets.UTF_8.name())
+
+        val response = JsonHttpClient.request(
+            path = "/auth/verify-email?token=$encodedToken"
+        )
+
+        AuthSessionStore.clearPendingVerificationEmail()
+        return response.optString("message").ifBlank { "Email verified successfully." }
+    }
+
+    suspend fun resendVerification(): String {
+        val email = AuthSessionStore.getPendingVerificationEmail()
+            ?: throw ApiException(
+                message = "No signup email is available. Please sign up again or log in after verifying from your email.",
+                status = 400,
+                code = "MISSING_EMAIL"
+            )
+
+        val response = JsonHttpClient.request(
+            path = "/auth/resend-verification",
+            method = "POST",
+            body = JSONObject().put("email", email)
+        )
+
+        return response.optString("message").ifBlank {
+            "Verification email sent. Please check your inbox."
+        }
+    }
+
+    fun logout() {
+        AuthSessionStore.clearAccessToken()
+        AuthSessionStore.clearPendingVerificationEmail()
+        ProfileRepository.clearProfile()
+    }
+
+    private fun extractVerificationToken(tokenOrLink: String): String {
+        val trimmed = tokenOrLink.trim()
+        if (trimmed.isBlank()) {
+            throw ApiException(
+                message = "Paste the verification link or token from your email.",
+                status = 400,
+                code = "VALIDATION_ERROR"
+            )
+        }
+
+        val tokenPrefix = "token="
+        val tokenIndex = trimmed.indexOf(tokenPrefix)
+        if (tokenIndex >= 0) {
+            return trimmed.substring(tokenIndex + tokenPrefix.length)
+                .substringBefore('&')
+                .trim()
+        }
+
+        return trimmed
+    }
+}