integrate invoicing-service with external api to generate invoices

invoicing-service/pom.xml

@@ -28,6 +28,11 @@
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>com.google.code.gson</groupId>
+            <artifactId>gson</artifactId>
+            <version>2.8.9</version>
+        </dependency>
     </dependencies>
     <build>
         <plugins>

invoicing-service/src/main/java/org/example/InvoicingServiceApplication.java

@@ -2,12 +2,11 @@ package org.example;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
-import org.springframework.context.annotation.Bean;
+
 
 @SpringBootApplication
 public class InvoicingServiceApplication {
     public static void main(String[] args) {
         SpringApplication.run(InvoicingServiceApplication.class, args);
     }
-
 }

invoicing-service/src/main/java/org/example/resources/ExternalAPI.java

+package org.example.resources;
+
+import com.google.gson.Gson;
+import com.google.gson.reflect.TypeToken;
+import org.example.models.Invoice;
+import org.springframework.web.bind.annotation.PathVariable;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.lang.reflect.Type;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+
+public class ExternalAPI {
+    public static Invoice getInvoiceDetails(String invoiceId) throws IOException {
+        String prompt = "{\n" +
+                "    \"prompt\": \"generate just one random json object contains these attributes: value, status, description, userID, invoiceID. where status is false and value is double and invoiceId is " + invoiceId + ", please just return this object without any words else\"\n" +
+                "}";
+        String response = sendRequestToAPI(prompt);
+        String jsonString = "";
+        int firstIndex = response.toString().indexOf("{");
+        int endIndex = response.toString().indexOf("}");
+        jsonString = response.toString().substring(firstIndex, endIndex + 1);
+        Gson gson = new Gson();
+        Invoice invoice = gson.fromJson(jsonString, Invoice.class);
+        System.out.println(invoice.toString());
+        return invoice;
+    }
+     static public List<Invoice> getUnPaidInvoicesForSpecificUser(String userId){
+         String prompt = "{\n" +
+                 "    \"prompt\": \"generate list of  random json objects each object contains these attributes: value, status, description, userID, invoiceID. where status is false and value is double and invoiceId is unique and userId is " + userId+ ", please just return this list of objects without any words else\"\n" +
+                 "}";
+         ArrayList<Invoice> invoices = new ArrayList<Invoice>();
+         String response = null;
+         try {
+             response = sendRequestToAPI(prompt);
+         } catch (IOException e) {
+             throw new RuntimeException(e);
+         }
+         String jsonString = "";
+         int firstIndex = response.toString().indexOf("[");
+         int endIndex = response.toString().indexOf("]");
+         jsonString = response.toString().substring(firstIndex, endIndex + 1);
+         Type listType = new TypeToken<List<Invoice>>() {}.getType();
+         Gson gson = new Gson();
+         invoices = gson.fromJson(jsonString, listType);
+         return invoices;
+    }
+    static public List<Invoice> getUnPaidInvoices(){
+        String prompt = "{\n" +
+                "    \"prompt\": \"generate list of  random json objects each object contains these attributes: value, status, description, userID, invoiceID. where status is false and value is double and invoiceId is unique, please just return this list of objects without any words else\"\n" +
+                "}";
+        ArrayList<Invoice> invoices = new ArrayList<Invoice>();
+        String response = null;
+        try {
+            response = sendRequestToAPI(prompt);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+        String jsonString = "";
+        int firstIndex = response.toString().indexOf("[");
+        int endIndex = response.toString().indexOf("]");
+        jsonString = response.toString().substring(firstIndex, endIndex + 1);
+        Type listType = new TypeToken<List<Invoice>>() {}.getType();
+        Gson gson = new Gson();
+        invoices = gson.fromJson(jsonString, listType);
+        return invoices;
+    }
+    static public List<Invoice> getPaidInvoices(){
+        String prompt = "{\n" +
+                "    \"prompt\": \"generate list of  random json objects each object contains these attributes: value, status, description, userID, invoiceID. where status is true and value is double and invoiceId is unique, please just return this list of objects without any words else\"\n" +
+                "}";
+        ArrayList<Invoice> invoices = new ArrayList<Invoice>();
+        String response = null;
+        try {
+            response = sendRequestToAPI(prompt);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+        String jsonString = "";
+        int firstIndex = response.toString().indexOf("[");
+        int endIndex = response.toString().indexOf("]");
+        jsonString = response.toString().substring(firstIndex, endIndex + 1);
+        Type listType = new TypeToken<List<Invoice>>() {}.getType();
+        Gson gson = new Gson();
+        invoices = gson.fromJson(jsonString, listType);
+        return invoices;
+    }
+
+    public static String sendRequestToAPI(String prompt) throws IOException{
+        URL url = new URL("https://fumes-api.onrender.com/llama3");
+        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
+        connection.setRequestMethod("POST");
+        connection.setRequestProperty("Content-Type", "application/json");
+        connection.setDoOutput(true);
+        String requestBody = prompt;
+        try (OutputStream outputStream = connection.getOutputStream()) {
+            byte[] input = requestBody.getBytes("utf-8");
+            outputStream.write(input, 0, input.length);
+        }
+        StringBuilder response = new StringBuilder();
+        try (BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "utf-8"))) {
+            String line;
+            while ((line = reader.readLine()) != null) {
+                response.append(line);
+            }
+        }
+        catch (IOException e){
+            System.out.println(e.getMessage());
+        }
+        connection.disconnect();
+        return response.toString();
+    }
+
+}

invoicing-service/src/main/java/org/example/resources/InvoiceResource.java

 package org.example.resources;
 
 import org.example.models.Invoice;
-import org.example.models.User;
-import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.*;
-import org.springframework.web.client.RestTemplate;
 
+import java.io.IOException;
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.List;
 
 @RestController
@@ -15,42 +12,37 @@ import java.util.List;
 public class InvoiceResource {
     @GetMapping("/getInvoiceDetails/{invoiceId}")
     public Invoice getInvoiceDetails(@PathVariable("invoiceId") String invoiceId){
-        Invoice invoice = new Invoice("2", "1","dddddddddd",false,300.0);
+
+        Invoice invoice = null;
+        try {
+            invoice = ExternalAPI.getInvoiceDetails(invoiceId);
+        } catch (IOException e){
+            throw new RuntimeException(e);
+        }
         return invoice;
     }
 
     @GetMapping("/getUnPaidInvoicesForSpecificUser/{userId}")
     public List<Invoice> getUnPaidInvoicesForSpecificUser(@PathVariable("userId") String userId){
-        Invoice inv1 = new Invoice("1", "1","ssssssd",false,55.0);
-        Invoice inv2 = new Invoice("2", "1","dddddddddd",false,545.0);
-        ArrayList<Invoice> inv = new ArrayList<Invoice>();
-        inv.add(inv1);
-        inv.add(inv2);
+        List<Invoice> inv = new ArrayList<>();
+        inv = ExternalAPI.getUnPaidInvoicesForSpecificUser(userId);
         return inv;
     }
     @PostMapping("/updateInvoiceStatus/{invoiceId}")
     public boolean updateInvoiceStatus(@PathVariable("invoiceId") String invoiceId){
-
-        Invoice invoice = new Invoice("2", "1","dddddddddd",false,545.0);
-        invoice.setStatus(true);
+        /* here some logic like get invoice from database and set the status to true */
         return true;
     }
     @GetMapping("/getUnPaidInvoices")
     public List<Invoice> getUnPaidInvoices(){
-        Invoice invoice1 = new Invoice("2", "1","dddddddddd",false,545.0);
-        Invoice invoice2 = new Invoice("3", "2","dddddddddd",false,545.0);
-        ArrayList<Invoice> inv = new ArrayList<Invoice>();
-        inv.add(invoice1);
-        inv.add(invoice2);
-        return inv;
+        List<Invoice> invoices = new ArrayList<Invoice>();
+        invoices = ExternalAPI.getUnPaidInvoices();
+        return invoices;
     }
     @GetMapping("/getPaidInvoices")
     public List<Invoice> getPaidInvoices(){
-        Invoice invoice1 = new Invoice("2", "1","dddddddddd",true,545.0);
-        Invoice invoice2 = new Invoice("3", "2","dddddddddd",true,545.0);
-        ArrayList<Invoice> inv = new ArrayList<Invoice>();
-        inv.add(invoice1);
-        inv.add(invoice2);
-        return inv;
+        List<Invoice> invoices = new ArrayList<Invoice>();
+        invoices = ExternalAPI.getPaidInvoices();
+        return invoices;
     }
 }

users-service/src/main/java/org/example/resources/UserResource.java

@@ -18,25 +18,15 @@ public class UserResource {
     
     @GetMapping("/getUnPaidInvoices/{userId}")
     public List<Invoice> getUnPaidInvoices(@PathVariable("userId") String userId){
-//        Invoice inv1 = new Invoice("1", "1","ssssssd",false,55.0);
-//        Invoice inv2 = new Invoice("2", "1","dddddddddd",false,545.0);
-//
-//        System.out.println(userId);
-//
-//        ArrayList<Invoice> inv = new ArrayList<Invoice>();
-//        inv.add(inv1);
-//        inv.add(inv2);
         List<Invoice> invoices = Arrays.asList(restTemplate.getForObject("http://localhost:8081/invoices/getUnPaidInvoicesForSpecificUser/" + userId, Invoice[].class));
         return invoices;
     }
     @PostMapping("/payInvoice/{userId}/{invoiceId}")
     public boolean payInvoice(@PathVariable("userId") String userId,@PathVariable("invoiceId") String invoiceId){
-        User user = new User("1","Ali",500.0);
-//        Invoice invoice = new Invoice("2", "1","dddddddddd",false,545.0);
+        User user = new User(userId,"Ali",5000.0);
         Invoice invoice = restTemplate.getForObject("http://localhost:8081/invoices/getInvoiceDetails/" + invoiceId, Invoice.class);
         if(user.getBalance() >= invoice.getValue()){
             user.setBalance(user.getBalance() - invoice.getValue());
-            // boolean status = restTemplate.postForObject("http://localhost:8081/invoices/updateInvoiceStatus/" + invoiceId, boolean.class);
             String url = "http://localhost:8081/invoices/updateInvoiceStatus/" + invoiceId;
             ResponseEntity<Boolean> response = restTemplate.exchange(url, HttpMethod.POST, null, Boolean.class);
             boolean status = response.getBody();
@@ -49,13 +39,6 @@ public class UserResource {
     }
     @GetMapping("/getAllUsersHaveUnPaidInvoices")
     public HashMap<User,Invoice> getAllUsersHaveUnPaidInvoices(){
-  //      User user = new User("1","Ali",500.0);
-//        User user2 = new User("2","Hasan",5000.0);
-//        Invoice invoice1 = new Invoice("2", "1","dddddddddd",false,545.0);
-//        Invoice invoice2 = new Invoice("3", "2","dddddddddd",false,545.0);
-//        ArrayList<Invoice> inv = new ArrayList<Invoice>();
-//        inv.add(invoice1);
-//        inv.add(invoice2);
         List<Invoice> invoices = Arrays.asList(restTemplate.getForObject("http://localhost:8081/invoices/getUnPaidInvoices", Invoice[].class));
         HashMap<User,Invoice> userInvoiceHashMap = new HashMap<>();
         for (Invoice invoice: invoices)
@@ -72,13 +55,7 @@ public class UserResource {
     }
     @GetMapping("/getAllUsersHavePaidInvoices")
     public HashMap<User,Invoice> getAllUsersHavePaidInvoices(){
-   //     User user = new User("1","Ali",500.0);
-//        User user2 = new User("2","Hasan",5000.0);
-//        Invoice invoice1 = new Invoice("2", "1","dddddddddd",true,545.0);
-//        Invoice invoice2 = new Invoice("3", "2","dddddddddd",true,545.0);
-//        ArrayList<Invoice> inv = new ArrayList<Invoice>();
-//        inv.add(invoice1);
-//        inv.add(invoice2);
+
         HashMap<User,Invoice> userInvoiceHashMap = new HashMap<>();
         List<Invoice> invoices = Arrays.asList(restTemplate.getForObject("http://localhost:8081/invoices/getPaidInvoices", Invoice[].class));