import frappe
import requests
import json
from invoice_az.auth import record_etaxes_activity, get_default_asan_login

# Constants
BASE_URL = "https://new.e-taxes.gov.az"
FIND_BY_FIN_URL = f"{BASE_URL}/api/po/profile/public/v1/taxpayer/findByFinAndPassport"

DEFAULT_HEADERS = {
    "Accept": "application/json, text/plain, */*",
    "Accept-Language": "en-US,en;q=0.9",
    "Content-Type": "application/json",
    "Cache-Control": "no-cache",
    "Pragma": "no-cache"
}


@frappe.whitelist()
def fetch_supplier_data_from_etaxes(supplier_name):
    """
    Fetch Individual supplier data from E-Taxes by FIN and Passport Serial Number

    Args:
        supplier_name: Name of Supplier document

    Returns:
        dict: {
            "success": bool,
            "data": {
                "fin": str,
                "fullName": str,
                "phone": str,
                "dateOfBirth": str,
                "firstname": str,
                "lastname": str,
                "patronimyc": str
            },
            "message": str
        }
    """
    try:
        # Record activity for token renewal
        record_etaxes_activity()

        # Get Supplier document
        supplier = frappe.get_doc("Supplier", supplier_name)

        # Validate supplier type
        if supplier.supplier_type != "Individual":
            return {
                "success": False,
                "message": "This function only works for Individual suppliers"
            }

        # Check required fields
        if not supplier.fin:
            return {
                "success": False,
                "message": "FIN is required. Please fill FIN field first."
            }

        if not supplier.passport_serial_number:
            return {
                "success": False,
                "message": "Passport Serial Number is required. Please fill Passport Serial Number field first."
            }

        # Get authentication token
        asan_login = get_default_asan_login()
        if not asan_login.get("found") or not asan_login.get("main_token"):
            return {
                "success": False,
                "message": "E-Taxes authentication not found. Please login via ASAN."
            }

        token = asan_login.get("main_token")

        # Build headers
        headers = DEFAULT_HEADERS.copy()
        headers["x-authorization"] = f"Bearer {token}"

        # Build payload
        payload = {
            "fin": supplier.fin,
            "passportSerialNumber": supplier.passport_serial_number
        }

        # Make API request
        response = requests.post(
            FIND_BY_FIN_URL,
            data=json.dumps(payload),
            headers=headers,
            timeout=30
        )

        # Handle 401 Unauthorized
        if response.status_code == 401:
            return {
                "success": False,
                "message": "Authentication expired. Please login again via ASAN."
            }

        # Handle 500 Server Error
        if response.status_code == 500:
            return {
                "success": False,
                "message": "E-Taxes service error. Please try again later."
            }

        # Handle 404 Not Found (person not found)
        if response.status_code == 404:
            return {
                "success": False,
                "message": "Person not found in E-Taxes system. Please check FIN and Passport Serial Number."
            }

        # Handle errors with E-Taxes message format
        # Accept both 200 (OK) and 201 (Created) as success
        if response.status_code not in [200, 201]:
            try:
                error_data = response.json()
                # Try to get Azərbaycan message first
                if isinstance(error_data, dict) and "message" in error_data:
                    if isinstance(error_data["message"], dict) and "az" in error_data["message"]:
                        return {
                            "success": False,
                            "message": error_data["message"]["az"]
                        }
                    elif isinstance(error_data["message"], str):
                        return {
                            "success": False,
                            "message": error_data["message"]
                        }
            except:
                pass

            return {
                "success": False,
                "message": f"E-Taxes error (status {response.status_code})"
            }

        response.raise_for_status()

        # Parse response
        result = response.json()

        return {
            "success": True,
            "data": result
        }

    except requests.exceptions.RequestException as e:
        frappe.log_error(
            f"Error fetching supplier data from E-Taxes: {str(e)}",
            "Fetch Supplier Data Error"
        )
        return {
            "success": False,
            "message": f"Network error: {str(e)}"
        }
    except Exception as e:
        frappe.log_error(
            f"Unexpected error fetching supplier data: {str(e)}\n{frappe.get_traceback()}",
            "Fetch Supplier Data Error"
        )
        return {
            "success": False,
            "message": f"Error: {str(e)}"
        }


@frappe.whitelist()
def update_supplier_from_etaxes(supplier_name):
    """
    Fetch data from E-Taxes and update Supplier fields

    Args:
        supplier_name: Name of Supplier document

    Returns:
        dict: Success/error response with update details
    """
    try:
        # Fetch data from E-Taxes
        fetch_result = fetch_supplier_data_from_etaxes(supplier_name)

        if not fetch_result.get("success"):
            return fetch_result

        data = fetch_result.get("data")

        # Get Supplier document
        supplier = frappe.get_doc("Supplier", supplier_name)

        # Update fields from E-Taxes response
        updated_fields = []

        # Date of birth
        if data.get("dateOfBirth") and not supplier.date_of_birth:
            supplier.date_of_birth = data.get("dateOfBirth")
            updated_fields.append("Date of Birth")

        # First name
        if data.get("firstname"):
            supplier.first_name_individual = data.get("firstname")
            updated_fields.append("First Name")

        # Last name
        if data.get("lastname"):
            supplier.last_name_individual = data.get("lastname")
            updated_fields.append("Last Name")

        # Patronymic (middle name / father's name)
        if data.get("patronimyc"):
            supplier.patronimyc = data.get("patronimyc")
            updated_fields.append("Patronymic")

        # Phone number (optional)
        if data.get("phone") and not supplier.phone_number_individual:
            supplier.phone_number_individual = data.get("phone")
            updated_fields.append("Phone Number")

        # Note: Supplier Name is not updated to preserve user's custom name

        # Save supplier
        supplier.save()
        frappe.db.commit()

        return {
            "success": True,
            "message": f"Supplier data updated successfully. Updated fields: {', '.join(updated_fields)}",
            "updated_fields": updated_fields
        }

    except Exception as e:
        frappe.log_error(
            f"Error updating supplier from E-Taxes: {str(e)}\n{frappe.get_traceback()}",
            "Update Supplier Error"
        )
        return {
            "success": False,
            "message": f"Error: {str(e)}"
        }