fix: changes as per comments

(cherry picked from commit 42d9bee)

india_compliance/gst_india/client_scripts/company.js

@@ -7,6 +7,7 @@ validate_gstin(DOCTYPE);
 update_gstin_in_other_documents(DOCTYPE);
 show_overseas_disabled_warning(DOCTYPE);
 set_gstin_options_and_status(DOCTYPE);
+set_pan_status(DOCTYPE)
 
 frappe.ui.form.off(DOCTYPE, "make_default_tax_template");
 frappe.ui.form.on(DOCTYPE, {

india_compliance/gst_india/client_scripts/customer.js

@@ -8,3 +8,4 @@ update_gstin_in_other_documents(DOCTYPE);
 show_overseas_disabled_warning(DOCTYPE);
 set_gstin_options_and_status(DOCTYPE);
 set_gst_category(DOCTYPE);
+set_pan_status(DOCTYPE)

india_compliance/gst_india/client_scripts/party.js

@@ -71,6 +71,9 @@ function validate_gstin(doctype) {
                 frm.doc.pan = pan;
                 frm.refresh_field("pan");
                 set_party_type(frm);
+                if(doctype != "Address"){
+                    india_compliance.set_pan_status(frm.get_field("pan"));
+                }
             }
         },
     });
@@ -123,15 +126,17 @@ function set_gstin_options_and_status(doctype) {
         refresh(frm) {
             set_gstin_options(frm);
             india_compliance.set_gstin_status(frm.get_field("gstin"));
-            if (doctype !== "Address") {
-                india_compliance.set_pan_status(frm.get_field("pan"));
-            }
         },
         gstin(frm) {
             india_compliance.set_gstin_status(frm.get_field("gstin"));
-            if (doctype !== "Address") {
-                india_compliance.set_pan_status(frm.get_field("pan"));
-            }
+        },
+    });
+}
+
+function set_pan_status(doctype) {
+    frappe.ui.form.on(doctype, {
+        refresh(frm) {
+            india_compliance.set_pan_status(frm.get_field("pan"));
         },
         pan(frm) {
             india_compliance.set_pan_status(frm.get_field("pan"));

india_compliance/gst_india/client_scripts/supplier.js

@@ -8,6 +8,7 @@ update_gstin_in_other_documents(DOCTYPE);
 show_overseas_disabled_warning(DOCTYPE);
 set_gstin_options_and_status(DOCTYPE);
 set_gst_category(DOCTYPE);
+set_pan_status(DOCTYPE)
 
 frappe.ui.form.on(DOCTYPE, {
     gstin(frm) {

india_compliance/gst_india/doctype/pan/pan.js

@@ -7,7 +7,4 @@ frappe.ui.form.on("Pan", {
             frm.call("update_pan_status");
         });
     },
-    pan(frm) {
-        frm.doc.pan = frm.doc.pan.toUpperCase();
-    },
 });

india_compliance/gst_india/doctype/pan/pan.json

@@ -1,52 +1,55 @@
 {
-    "actions": [],
-    "allow_rename": 1,
-    "creation": "2024-07-31 13:10:35.277697",
-    "doctype": "DocType",
-    "engine": "InnoDB",
-    "field_order": [
-        "pan",
-        "pan_status"
-    ],
-    "fields": [
-        {
-            "fieldname": "pan",
-            "fieldtype": "Data",
-            "label": "Pan"
-        },
-        {
-            "fieldname": "pan_status",
-            "fieldtype": "Data",
-            "label": "Pan Status"
-        },
-        {
-            "fieldname": "last_updated_on",
-            "fieldtype": "Datetime",
-            "label": "Last Updated On"
-        }
-    ],
-    "index_web_pages_for_search": 1,
-    "links": [],
-    "modified": "2024-07-31 13:11:07.830805",
-    "modified_by": "Administrator",
-    "module": "GST India",
-    "name": "Pan",
-    "owner": "Administrator",
-    "permissions": [
-        {
-            "create": 1,
-            "delete": 1,
-            "email": 1,
-            "export": 1,
-            "print": 1,
-            "read": 1,
-            "report": 1,
-            "role": "System Manager",
-            "share": 1,
-            "write": 1
-        }
-    ],
-    "sort_field": "creation",
-    "sort_order": "DESC",
-    "states": []
+ "actions": [],
+ "allow_rename": 1,
+ "creation": "2024-07-31 13:10:35.277697",
+ "doctype": "DocType",
+ "engine": "InnoDB",
+ "field_order": [
+  "pan",
+  "pan_status",
+  "last_updated_on"
+ ],
+ "fields": [
+  {
+   "fieldname": "pan",
+   "fieldtype": "Data",
+   "label": "Pan"
+  },
+  {
+   "fieldname": "pan_status",
+   "fieldtype": "Data",
+   "label": "Pan Status"
+  },
+  {
+   "fieldname": "last_updated_on",
+   "fieldtype": "Datetime",
+   "label": "Last Updated On"
+  }
+ ],
+ "in_create": 1,
+ "index_web_pages_for_search": 1,
+ "links": [],
+ "modified": "2024-08-07 15:04:50.116211",
+ "modified_by": "Administrator",
+ "module": "GST India",
+ "name": "Pan",
+ "owner": "Administrator",
+ "permissions": [
+  {
+   "create": 1,
+   "delete": 1,
+   "email": 1,
+   "export": 1,
+   "print": 1,
+   "read": 1,
+   "report": 1,
+   "role": "System Manager",
+   "share": 1,
+   "write": 1
+  }
+ ],
+ "read_only": 1,
+ "sort_field": "creation",
+ "sort_order": "DESC",
+ "states": []
 }

india_compliance/gst_india/doctype/pan/pan.py

@@ -1,14 +1,135 @@
 # Copyright (c) 2024, Resilient Tech and contributors
 # For license information, please see license.txt
 
+import random
+
+import requests
+
 import frappe
 from frappe.model.document import Document
+from frappe.utils import now
+
+multiplication_table = [
+    [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
+    [1, 2, 3, 4, 0, 6, 7, 8, 9, 5],
+    [2, 3, 4, 0, 1, 7, 8, 9, 5, 6],
+    [3, 4, 0, 1, 2, 8, 9, 5, 6, 7],
+    [4, 0, 1, 2, 3, 9, 5, 6, 7, 8],
+    [5, 9, 8, 7, 6, 0, 4, 3, 2, 1],
+    [6, 5, 9, 8, 7, 1, 0, 4, 3, 2],
+    [7, 6, 5, 9, 8, 2, 1, 0, 4, 3],
+    [8, 7, 6, 5, 9, 3, 2, 1, 0, 4],
+    [9, 8, 7, 6, 5, 4, 3, 2, 1, 0],
+]
+
+permutation_table = [
+    [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
+    [1, 5, 7, 6, 2, 8, 3, 0, 9, 4],
+    [5, 8, 0, 3, 7, 9, 6, 1, 4, 2],
+    [8, 9, 1, 6, 0, 4, 3, 5, 2, 7],
+    [9, 4, 5, 3, 1, 2, 6, 8, 7, 0],
+    [4, 2, 8, 6, 5, 7, 3, 9, 0, 1],
+    [2, 7, 9, 3, 8, 0, 6, 4, 1, 5],
+    [7, 0, 4, 6, 9, 1, 3, 2, 5, 8],
+]
 
-from india_compliance.gst_india.overrides.party import get_pancard_status
+inverse_table = [0, 4, 3, 2, 1, 5, 6, 7, 8, 9]
 
 
 class Pan(Document):
     @frappe.whitelist()
     def update_pan_status(self):
         get_pancard_status(self.pan, True)
         frappe.msgprint("PAN Status Updated")
+
+    def before_save(self):
+        self.name = self.pan.upper()
+
+
+def verhoeff_checksum(number: str) -> int:
+    """Calculate the Verhoeff checksum digit."""
+    c = 0
+    n = len(number)
+    for i in range(n):
+        c = multiplication_table[c][
+            permutation_table[(i + 1) % 8][int(number[n - i - 1])]
+        ]
+    return inverse_table[c]
+
+
+def generate_aadhaar_number():
+    """Generate a valid Aadhaar number using the Verhoeff algorithm."""
+    base_number = "".join(str(random.randint(0, 9)) for _ in range(11))
+    check_digit = verhoeff_checksum(base_number)
+    return base_number + str(check_digit)
+
+
+def fetch_pan_status_from_api(aadhaar_number, pan, force_update):
+    """This is an unofficial API"""
+    url = "https://eportal.incometax.gov.in/iec/servicesapi/getEntity"
+    payload = {
+        "aadhaarNumber": aadhaar_number,  # this is random generated aadhaar_number
+        "pan": pan,
+        "preLoginFlag": "Y",
+        "serviceName": "linkAadhaarPreLoginService",
+    }
+
+    try:
+        response = requests.post(url, json=payload)
+        return response.json().get("messages", [])
+    except ConnectionError:
+        msg = "Connection error. Please retry after some time."
+    except Exception:
+        msg = "An error occurred. Please retry after some time."
+
+    if force_update:
+        frappe.throw(msg)
+    else:
+        return ""
+
+
+def update_pan_document(pan, status):
+    if docname := frappe.db.exists("Pan", pan):
+        doc = frappe.get_doc("Pan", docname)
+    else:
+        doc = frappe.new_doc("Pan")
+
+    doc.update(
+        {
+            "pan": pan,
+            "pan_status": status,
+            "last_updated_on": now(),
+        }
+    )
+    doc.save()
+
+
+def get_pancard_status(pan, force_update):
+    aadhaar_number = generate_aadhaar_number()
+    messages = fetch_pan_status_from_api(aadhaar_number, pan, force_update)
+
+    if not messages:
+        return
+
+    error_code_desc_map = {
+        "EF40124": "Valid",  # pan linked to generated aadhar card number
+        "EF40026": "Valid",  # pan linked but not to generated aadhar card
+        "EF40119": "Valid",  # not an individual taxpayer : AAACS8577K
+        "EF40089": "Invalid",  # invalid pan : OIMPS2320M
+        "EF40024": "Not-Linked",
+        "EF40077": "",  # Invalid Aadhaar number
+    }
+
+    status = error_code_desc_map.get(messages[0].get("code", ""), "")
+    if not status:
+        return
+
+    update_pan_document(pan, status)
+
+
+@frappe.whitelist()
+def get_pan_status(pan, force_update=False):
+    if force_update or not frappe.db.exists("Pan", pan):
+        get_pancard_status(pan, force_update)
+
+    return frappe.db.get_value("Pan", pan, ["pan_status", "last_updated_on"])