import datetime, pytz

from typing import Dict, List, Optional, Set, Union, ClassVar
from pydantic import BaseModel, EmailStr, Field, Json, PrivateAttr, ValidationError, validator, root_validator

from app.db_sql import redis_lookup_id_random
from app.lib_general import log, logging

from app.models.common_field_schema import base_fields, default_num_bytes


# ### BEGIN ### API Hosted File Link Models ### Hosted_File_Link_Base() ###
class Hosted_File_Link_Base(BaseModel):
    log.setLevel(logging.WARNING) # DEBUG, INFO, WARNING, ERROR, EXCEPTION, CRITICAL
    log.debug(locals())

    id: Optional[Union[int, str]] = Field(None)
    account_id: Optional[Union[int, str]] = Field(None, **base_fields['account_id_random'])

    hosted_file_id: Optional[Union[int, str]] = Field(None, **base_fields['hosted_file_id_random'])

    link_to_type: Optional[str] # Should this be renamed to "link_to_obj_type" for clarity?
    link_to_id: Optional[Union[int, str]] = Field(None) # Random string or integer

    # notes: Optional[str]
    created_on: Optional[datetime.datetime] = None
    updated_on: Optional[datetime.datetime] = None

    # Including other related objects
    link_to: Optional[dict] # Should this be renamed to "link_to_obj" or leave off the "_obj"?

    _processed_at: datetime.datetime = PrivateAttr(default_factory=datetime.datetime.now)

    @root_validator(pre=True)
    def map_v3_ids(cls, values):
        """
        Vision Transformer:
        Map DB keys to clean API keys and strip internal integers.
        """
        # 1. Map account_id
        if a_rid := values.get('account_id_random'):
            if not isinstance(values.get('account_id'), int):
                values['account_id'] = a_rid
                
        # 2. Map hosted_file_id
        if f_rid := values.get('hosted_file_id_random'):
            if not isinstance(values.get('hosted_file_id'), int):
                values['hosted_file_id'] = f_rid
                
        # 3. Map link_to_id
        if l_rid := values.get('link_to_id_random'):
            if not isinstance(values.get('link_to_id'), int):
                values['link_to_id'] = l_rid
                
        return values

    # Fields that are part of the model (for reading) but should not be saved to the DB table
    fields_to_exclude_from_db: ClassVar[list] = [
        'link_to'
    ]

    class Config:
        underscore_attrs_are_private = True
        allow_population_by_field_name = True
        fields = base_fields
# ### END ### API Hosted File Link Models ### Hosted_File_Link_Base() ###