"""
Project:    PARTS Website
Author:     Edward Middleton-Smith
            Precision And Research Technology Systems Limited

Technology: DataStores
Feature:    Base DataStore

Description:
Datastore for Store
"""

# internal
# from routes import bp_home
import lib.argument_validation as av
from business_objects.sql_error import SQL_Error
from business_objects.project_hub.user import User
# from helpers.helper_db_mysql import Helper_DB_MySQL
# from models.model_view_store_checkout import Model_View_Store_Checkout # circular!
from extensions import db
from forms.access_level import Filters_Access_Level
from forms.unit_measurement import Filters_Unit_Measurement
from helpers.helper_app import Helper_App
# external
from sqlalchemy import text
from flask import Flask, session, current_app
from pydantic import BaseModel, ConfigDict
import time
from sqlalchemy.exc import OperationalError



class DataStore_Base(BaseModel):

    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        
    @staticmethod
    def db_procedure_execute(proc_name, argument_dict_list = None):
        # Argument validation
        _m = 'DataStore_Base.db_procedure_execute'
        av.val_str(proc_name, 'proc_name', _m)
        proc_string = f'CALL {proc_name}('
        has_arguments = not str(type(argument_dict_list)) == "<class 'NoneType'>"
        if has_arguments:
            arg_keys = list(argument_dict_list.keys())
            for i in range(len(arg_keys)):
                proc_string += f'{"" if i == 0 else ", "}:{arg_keys[i]}'
        proc_string += ')'
        proc_string = text(proc_string)
        Helper_App.console_log(f'{_m}\nproc_string: {proc_string}\nargs: {argument_dict_list}')

        if has_arguments:
            result = db.session.execute(proc_string, argument_dict_list)
        else:
            result = db.session.execute(proc_string)
        Helper_App.console_log(f'result: {result}')
        # conn.session.remove()
        return result
    
    @staticmethod
    def db_cursor_clear(cursor):
        while cursor.nextset():
            Helper_App.console_log(f'new result set: {cursor.fetchall()}')

    @staticmethod
    def get_user_session():
        Helper_App.console_log('DataStore_Base.get_user_session')
        user = User.from_json(session.get(User.FLAG_USER))
        if user.id_user <= 0:
            user.id_user = 3
        return user
    
    @staticmethod
    def upload_bulk(permanent_table_name, records, batch_size):
        _m = 'DataStore_Base.upload_bulk'
        Helper_App.console_log(f'{_m}\nstarting...')
        Helper_App.console_log(f'permanent_table_name: {permanent_table_name}')
        if db.session.dirty or db.session.new or db.session.deleted:
            Helper_App.console_log("Session is not clean")
            return
        # Assuming `permanent_table_name` is a string representing the table name
        table_object = db.metadata.tables.get(permanent_table_name)
        if table_object is None:
            Helper_App.console_log(f"Table {permanent_table_name} not found in metadata.")
            return
        else:
            expected_columns = set(column.name for column in db.inspect(table_object).columns)
            Helper_App.console_log(f'expected_columns: {expected_columns}')
        max_retries = 3
        initial_backoff = 1
        for i in range(0, len(records), batch_size):
            batch = records[i:i + batch_size]
            try:
                retries = 0
                while retries < max_retries:
                    try:
                        db.session.bulk_save_objects(batch)
                        db.session.commit()
                        break
                    except OperationalError as e:
                        if "Lock wait timeout exceeded" not in str(e) or retries == max_retries - 1:
                            raise
                        
                        wait_time = initial_backoff * (2 ** retries)
                        current_app.logger.warning(f"Lock timeout encountered. Retrying in {wait_time} seconds... (Attempt {retries + 1}/{max_retries})")
                        time.sleep(wait_time)
                        retries += 1
                        
                        # Ensure the session is clean for the retry
                        db.session.rollback()
            except Exception as e:
                db.session.rollback()
                raise e