From f86174bc1170b84beef16e03fd9148d82dbe8114 Mon Sep 17 00:00:00 2001
From: kilian <kilian.scheidecker@orange.fr>
Date: Sat, 4 Oct 2025 17:03:36 +0200
Subject: [PATCH] overhaul of paypal handler WIP

---
 backend/src/payments/payment_handler.py | 126 ++++++++++++++++++------
 backend/src/structs/item_store.py       |   4 +
 2 files changed, 99 insertions(+), 31 deletions(-)
 create mode 100644 backend/src/structs/item_store.py

diff --git a/backend/src/payments/payment_handler.py b/backend/src/payments/payment_handler.py
index c682c79..653cf8b 100644
--- a/backend/src/payments/payment_handler.py
+++ b/backend/src/payments/payment_handler.py
@@ -1,19 +1,23 @@
 from typing import Literal
-import paypalrestsdk
+import logging
+import json
+
 from pydantic import BaseModel
 from fastapi import HTTPException
-import logging
-
 import requests
+
 from ..configuration.environment import Environment
 
 
 # Model for payment request body
-class PaymentRequest(BaseModel):
+class OrderDetails():
+    
     user_id: str
-    credit_amount: Literal[10, 50, 100]
-    currency: Literal["USD", "EUR", "CHF"]  
-    description: str = "Purchase of credits"
+    number_of_credits: Literal[10, 50, 100]
+    unit_price: float
+    amount: int
+    currency: Literal['USD', 'EUR', 'CHF']
+
 
 
 # Payment handler class for managing PayPal payments
@@ -24,52 +28,110 @@ class PaypalHandler:
     password = Environment.paypal_key_sandbox
 
 
-
     def __init__(
             self,
-            transaction_details: PaymentRequest,
+            order_details: OrderDetails,
             sandbox_mode: bool = False
             ):
-        self.details = transaction_details
+        # Initialize the logger
         self.logger = logging.getLogger(__name__)
+
+        # Payment request parameters
+        self.order_details = order_details
         self.sandbox = sandbox_mode
 
     # Only support purchase of credit 'bundles': 10, 50 or 100 credits worth of trip generation
-    def fetch_price(self) -> float:
-        """
-        Fetches the price of credits in the specified currency.
-        """
-        result = self.supabase.table("prices").select("credit_amount").eq("currency", self.details.currency).single().execute()
-        if result.data:
-            return result.data.get("price")
-        else:
-            self.logger.error(f"Unsupported currency: {self.details.currency}")
-            return None
+    # def fetch_price(self) -> float:
+    #     '''
+    #     Fetches the price of credits in the specified currency.
+    #     '''
+    #     result = self.supabase.table('prices').select('credit_amount').eq('currency', self.details.currency).single().execute()
+    #     if result.data:
+    #         return result.data.get('price')
+    #     else:
+    #         self.logger.error(f'Unsupported currency: {self.details.currency}')
+    #         return None
 
 
     def validate(self):
 
         if self.sandbox :
-            validation_url = "https://api-m.sandbox.paypal.com/v1/oauth2/token"
+            validation_url = 'https://api-m.sandbox.paypal.com/v1/oauth2/token'
         else :
-            validation_url = "https://api-m.paypal.com/v1/oauth2/token"
+            validation_url = 'https://api-m.paypal.com/v1/oauth2/token'
 
         # payload for the validation request
         validation_data = {'grant_type': 'client_credentials'}
 
-        # pass the request
-        validation_response = requests.post(
-            url=validation_url,
-            data=validation_data,
-            auth=(self.username, self.password)
-        )
+        try: 
+            # pass the request
+            validation_response = requests.post(
+                url=validation_url,
+                data=validation_data,
+                auth=(self.username, self.password)
+            )
 
-        # TODO: continue here
+        except Exception as exc:
+            self.logger.error(f'Error while requesting access token: {exc}')
+            return None
+        
+        if validation_response.status_code == 201 :
+            access_token = json.loads(validation_response.text)['access_token']
+            self.logger.info('Validation step successful. Returning access token.')
+            return access_token
+        
+        self.logger.error(f'Error {validation_response.status_code} while requesting access token: {validation_response.text}')
+        return None        
 
 
-        pass
+    def order(
+        self,
+        access_token: int
+    ):
 
-    def order(self):
+        if self.sandbox :
+            order_url = 'https://api-m.sandbox.paypal.com/v2/checkout/orders'
+        else :
+            order_url = 'https://api-m.paypal.com/v2/checkout/orders'
+
+        # payload for the order equest
+        order_data = {
+            'intent': 'CAPTURE',
+            'purchase_units': [
+                {
+                    'items': [
+                        {
+                            'name': f'{self.order_details.number_of_credits} Credits Pack',
+                            'description': f'Credits for {self.order_details.number_of_credits} trip generations on AnyWay.',
+                            'quantity': self.order_details.amount,
+                            'unit_amount': {
+                                'currency_code': self.order_details.currency,
+                                'value': self.order_details.unit_price
+                            }
+
+                        }
+                    ],
+                    'amount': {
+                        'currency_code': self.order_details.currency,
+                        'value': self.order_details.amount*self.order_details.unit_price,
+                        # 'breakdown': {
+                        #     'item_total': {
+                        #         'currency_code': 'CHF',
+                        #         'value': '5.00'
+                        #     }
+                        # }
+                        ## what is that for ?
+                    }
+                }
+            ],
+            # TODO: add these to anydev website somehow
+            'application_context': {
+                'return_url': 'https://anydev.info',
+                'cancel_url': 'https://anydev.info'
+            }
+        }
+
+        # TODO continue here
 
 
         pass
@@ -77,6 +139,8 @@ class PaypalHandler:
     def capture(self):
 
 
+
+
         pass
 
 
diff --git a/backend/src/structs/item_store.py b/backend/src/structs/item_store.py
new file mode 100644
index 0000000..1a230f6
--- /dev/null
+++ b/backend/src/structs/item_store.py
@@ -0,0 +1,4 @@
+"""This module contains the descriptions of items to be purchased in the AnyWay store."""
+
+
+