Transform to multi-account support

common/client/MeteClient.swift

@@ -0,0 +1,84 @@
+//
+//  MeteClient.swift
+//  meterios
+//
+//  (c) 2025 Martin "maride" Dessauer
+//
+
+import Foundation
+
+enum MeteClientError: Error {
+    case StatusCodeLooksBad(explanation: String)
+}
+
+/// **MeteClient** is the client-side implementation of the Space Market API. Pure Swift, no platform-specific frameworks used.
+class MeteClient {
+    private let address: String
+    private let userID: Int
+
+    init(address: String, userID: Int) {
+        self.address = address
+        self.userID = userID
+    }
+    
+    func CanConnect() async throws -> Bool {
+        // Send HTTP request to the drinks endpoint
+        let url = URL(string: "https://\(address)/api/v1/users/stats.json")
+        let (_, response) = try await URLSession.shared.data(from: url!)
+        
+        let statusCode = (response as? HTTPURLResponse)?.statusCode
+        return statusCode == 200
+    }
+
+    // GetDrinks returns the list of drinks available at the backend
+    func GetDrinks() async throws -> Array<MeteClientDrink> {
+        // Send HTTP request to the drinks endpoint
+        let url = URL(string: "https://\(address)/api/v1/drinks")
+        let (data, _) = try await URLSession.shared.data(from: url!)
+    
+        // Decode JSON to array of drinks
+        let decoder = JSONDecoder()
+        let drinks = try decoder.decode([MeteClientDrink].self, from: data)
+
+        return drinks
+    }
+
+    // GetUser returns the user object for the given ID
+    func GetUser() async throws -> MeteClientUser {
+        // Send HTTP request to the user endpoint
+        let url = URL(string: "https://\(address)/api/v1/users/\(userID).json")
+        let (data, _) = try await URLSession.shared.data(from: url!)
+    
+        // Decode JSON to array of drinks
+        let decoder = JSONDecoder()
+        let user = try decoder.decode(MeteClientUser.self, from: data)
+
+        return user
+    }
+
+    // GetUsers returns all users registered at the backend
+    func GetUsers() async throws -> Array<MeteClientUser> {
+        // Send HTTP request to the user endpoint
+        let url = URL(string: "https://\(address)/api/v1/users.json")
+        let (data, _) = try await URLSession.shared.data(from: url!)
+
+        // Decode JSON to array of drinks
+        let decoder = JSONDecoder()
+        let users = try decoder.decode([MeteClientUser].self, from: data)
+
+        return users
+    }
+
+    // BookDrink subtracts the recommended price off the balance from the user given by ID
+    func BookDrink(_ drinkID: Int) async throws {
+        // Send HTTP request to the user endpoint
+        let url = URL(string: "https://\(address)/api/v1/users/\(userID)/buy.json?drink=\(drinkID)")
+        let (_, response) = try await URLSession.shared.data(from: url!)
+
+        // Check status code
+        let statusCode = (response as? HTTPURLResponse)?.statusCode
+        if statusCode != 204 {
+            throw MeteClientError.StatusCodeLooksBad(explanation: "Failed to book drink \(drinkID) for user \(userID)@\(address): HTTP status code \(statusCode ?? 0) received for \(url!)")
+        }
+    }
+}