feat: registration api support

app/src/main/java/com/p_vacho/neat_calendar/api/models/AuthModels.kt

@@ -28,4 +28,17 @@ data class SessionResponse(
     val expires_at: String, // ISO 8601
     val created_at: String, // ISO 8601
     val revoked: Boolean,
+)
+
+data class RegisterRequest(
+    val username: String,
+    val password: String,
+    val email: String,
+)
+
+data class RegisterResponse(
+    val user_id: String,
+    val username: String,
+    val email: String,
+    val created_at: String, // ISO 8601
 )

app/src/main/java/com/p_vacho/neat_calendar/api/services/AuthService.kt

@@ -19,4 +19,7 @@ interface AuthService {
 
     @GET("session")
     suspend fun getSession(@Header("Authorization") token: String): SessionResponse
+
+    @POST("users")
+    suspend fun register(@Body registerRequest: RegisterRequest): RegisterResponse
 }

app/src/main/java/com/p_vacho/neat_calendar/auth/AuthRepository.kt

@@ -3,6 +3,8 @@ package com.p_vacho.neat_calendar.auth
 import android.util.Log
 import com.p_vacho.neat_calendar.api.RetrofitClient
 import com.p_vacho.neat_calendar.api.models.LoginRequest
+import com.p_vacho.neat_calendar.api.models.RegisterRequest
+import com.p_vacho.neat_calendar.api.models.RegisterResponse
 import com.p_vacho.neat_calendar.api.models.SessionResponse
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
@@ -25,6 +27,20 @@ class AuthRepository(private val tokenManager: TokenManager) {
         }
     }
 
+    // Register user (doesn't perform a login)
+    suspend fun register(username: String, password: String, email: String): RegisterResponse? {
+        return withContext(Dispatchers.IO) {
+            try {
+                val response = RetrofitClient.authService.register(RegisterRequest(username, password, email))
+                Log.i("API", "Register request succesful")
+                response
+            } catch (e: Exception) {
+                Log.w("API", "Register request failed", e)
+                null
+            }
+        }
+    }
+
     // Validate the access token by fetching session info
     suspend fun validateAccessToken(): SessionResponse? {
         return withContext(Dispatchers.IO) {