text: from .table_info_gen import DBP
  from .parse import parse
  from typing import Dict
  from .auto_db_test_maker import TestGenerateSession
  import re
  
  Indent = '    '
  Indentn = '\n' + Indent
  
  
  def render_column(v: dict) -> str:
      ret = [v['__type__']]
      del v['__type__']
  
      if '__foreign__' in v:
          ret.append(v['__foreign__'])
          del v['__foreign__']
      elif '__sequence__' in v:
          ret.append(v['__sequence__'])
          del v['__sequence__']
  
      # kwargs
      for a, b in v.items():
          ret.append(f'{a}={b}')
  
      return ', '.join(ret)
  
  
  def relationship(reference_type_name: str, from_field: str, ref_field: str, use_list=True):
      relation_table = None
  
      @property
      def reference(self):
          nonlocal relation_table
          if not relation_table:
              relation_table = eval(reference_type_name)
  
          res = relation_table.query.filter(getattr(relation_table, ref_field) == getattr(self, from_field))
          if not use_list:
              return res.frist()
          return res
  
      return reference
  
  
  relation_delete_spec = ("@DeleteManager.Between({ManageType}, {DeleteType})\n"
                          "def delete_{delete_type}_from_{manage_type}(*relations) -> Optional[Seq[Tuple[Optional[dict], Optional[dict]]]]:\n"
                          "{codes}\n")
  
  entity_delete_spec = ("@DeleteManager.For({EntityType})\n"
                        "def delete_{entity_type}(entity) -> {RetType}:\n"
                        "{codes}\n")
  
  
  class Analyzer:
  
      def __init__(self, dbp: DBP, *conf: str, **custom_libs):
          self.dbp = dbp
          self.config_codes = conf
          self.custom_libs = custom_libs
  
      def generate_table(self, table_name, table: dict) -> str:
  
          res = ("class {TableName}(Base, ITable):\n"
                 "{Indent}__tablename__ = '{table_name}'\n\n"
                 "{Indent}# primary keys\n{Indent}{primaries}\n\n"
                 "{Indent}# fields\n{Indent}{fields}\n\n"
                 "{Indent}# relationship\n{Indent}{relations}\n\n"
                 "{Indent}# repr\n{Indent}def __repr__(self):\n{Indent}{Indent}return {repr}\n").format(
  
              Indent=Indent,
  
              TableName=table_name,
  
              table_name='_'.join(map(str.lower, re.findall('[A-Z][a-z_]*', table_name))),
  
              primaries=Indentn.join(f'{field_name} = Column({render_column(v)})' for field_name, v in
  
                                     table['primary'].items()),
              fields=Indentn.join(f'{field_name} = Column({render_column(v)})' for field_name, v in
                                  table['field'].items()),
  
              relations=Indentn.join(table['relation']),
  
              repr=table['repr'])
  
          return res
  
      def make_relation_delete(self, manage_type: str, delete_type: str):
          delete_field_of_relation = self.dbp.RelationSpecForDestruction[manage_type].get(delete_type)
  
          if not delete_field_of_relation:
              codes = (f"{Indent}normal_delete_relations(*relations)\n"
                       f"{Indent}return None")
          else:
              codes = (f"{Indent}if not relations:\n"
                       f"{Indent*2}return ()\n"
                       f"{Indent}def __each__(e) -> Tuple[Optional[dict], Optional[dict]]:\n"
                       f"{Indent*2}temp = e.{delete_field_of_relation}\n"
                       f"{Indent*2}l = delete_{manage_type.lower()}_{delete_type.lower()}(e)\n"
                       f"{Indent*2}r = delete_{delete_type.lower()}(temp)\n"
                       f"{Indent*2}return l, r\n"
                       "\n\n"
                       f"{Indent}return tuple(__each__(each) for each in relations)\n")
  
          return relation_delete_spec.format(ManageType=manage_type, DeleteType=delete_type,
                                             manage_type=manage_type.lower(), delete_type=delete_type.lower(),
                                             codes=codes)
  
      def make_entity_delete(self, entity_type: str):
          relations_to_delete = self.dbp.RelationSpec[entity_type]
  
          if not relations_to_delete:
              codes = f"{Indent}{entity_type}.query.filter_by(id=entity.id) if hasattr(entity, 'id') else db_session.delete(entity)\n"
              ret_type = 'None'
          else:
              lower_case_entity_type_name = entity_type.lower()
              key_list = []
  
              for each in relations_to_delete:
                  relations = f'entity.{self.dbp.RefTable[entity_type][each.capitalize()]}'
                  elem = f"'{each}': delete_{each}_from_{lower_case_entity_type_name}(*{relations})"
                  key_list.append(elem)
              content=f',\n{Indent*3}'.join(key_list)
              codes = (f'{Indent}ret = {{{content}}}\n'
                       f"{Indent}{entity_type}.query.filter_by(id=entity.id) if hasattr(entity, 'id') else db_session.delete(entity)\n"
                       f'{Indent}return ret')
              ret_type = 'Optional[Dict]'
  
          return entity_delete_spec.format(codes=codes,
                                           RetType=ret_type,
                                           EntityType=entity_type,
                                           entity_type='_'.join(map(str.lower, re.findall('[A-Z][a-z_]*', entity_type))))
  
      def generate(self, out_file: str):
  
          import os
  
          def generate_data(table_name: str, spec: Dict[str, dict]):
              session = TestGenerateSession()
              sample_num = 500
  
              def format_attr(attr_name, attr_type):
                  return f'{attr_name}={session.generate_inst_for_type(attr_type)}'
  
              def format_attrs(_spec):
                  return f', \n{Indent*3}'.join([format_attr(attr_name, more_info['__type__']) for attr_name, more_info in
                                                 _spec['primary'].items()] +
                                                [format_attr(attr_name, more_info['__type__']) for attr_name, more_info in
                                                 _spec['field'].items()])
  
              return "{}List = [\n{}{}]".format(table_name,
                                                Indent * 3,
                                                f',\n{Indent*3}'
                                                .join([f'{table_name}({format_attrs(spec)})'
                                                       for _ in range(sample_num)]))
  
          with open(os.path.splitext(out_file)[0] + '.test_samples.py', 'w') as f:
              f.write('from random import randint\n'
                      'from datetime import datetime, timedelta\n' +
                      '\n'.join(generate_data(k, v) for k, v in self.dbp.tables.items()))
  
          table_def_codes = '\n'.join(self.generate_table(k, v) for k, v in self.dbp.tables.items())
  
          entity_delete_codes = '\n'.join(self.make_entity_delete(k) for k in self.dbp.tables)
  
          relation_delete_codes = '\n'.join(
              self.make_relation_delete(k, v.capitalize()) for k, vs in self.dbp.RelationSpec.items() for v in vs)
  
          with open(os.path.join(os.path.split(__file__)[0], 'templates.py')) as f:
              templates = f.read()
  
          codes = templates.replace('##{config}##', ''.join(self.config_codes)
                                    ).replace('##{table_def}##', table_def_codes
                                              ).replace('##{methods}##', f'{entity_delete_codes}\n{relation_delete_codes}'
                                                        ).replace('##{custom_lib}##', '\n'.join(
              f'from {_from} import {_import}' for _import, _from in self.custom_libs.items()))
  
          def rec(v, symbol):
              return key_to_eval(v, symbol=symbol) if isinstance(v, dict) else f'"{v}"' if not symbol and isinstance(v,
                                                                                                                     str) else v
  
          def key_to_eval(dic: dict, symbol=False) -> str:
              dic = dict(dic)
              return '{{{}}}'.format(", ".join(f'{k}: {rec(v, symbol)}' for k, v in dic.items()))
  
          for_inspection = ("\nRefTable = {}\n".format(key_to_eval(self.dbp.RefTable)),
                            "RelationSpec = {}\n".format(key_to_eval(self.dbp.RelationSpec)),
                            "RelationSpecForDestruction = {}\n".format(key_to_eval(self.dbp.RelationSpecForDestruction)),
                            'LRType = {}\n'.format(key_to_eval(self.dbp.LRType, symbol=True)),
                            'LRRef = {}\n'.format(key_to_eval(self.dbp.LRRef)),
                            'FieldSpec = {}\n'.format(key_to_eval(self.dbp.FieldSpec)))
  
          with open(out_file, 'w') as f:
              f.write(codes + '\n'.join(for_inspection))
  