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


# ### BEGIN ### API Data Store Models ### Data_Store_Base() ###
class Data_Store_Base(BaseModel):
    log.setLevel(logging.INFO) # DEBUG, INFO, WARNING, ERROR, EXCEPTION, CRITICAL
    log.debug(locals())

    # --- Standardized Vision IDs (Strings) ---
    id: Optional[str] = Field(None, **base_fields['data_store_id_random'])
    data_store_id: Optional[str] = Field(None, **base_fields['data_store_id_random'])
    
    account_id: Optional[str] = Field(None, **base_fields['account_id_random'])
    person_id: Optional[str] = Field(None, **base_fields['person_id_random'])
    user_id: Optional[str] = Field(None, **base_fields['user_id_random'])

    # Internal Integer IDs (Excluded from API)
    # We use Optional[Union[int, str]] here to prevent validation crashes 
    # if the DB returns stringified integers or "NULL" strings.
    id_int: Optional[Union[int, str]] = Field(None, alias='id', exclude=True)
    account_id_int: Optional[Union[int, str]] = Field(None, alias='account_id', exclude=True)
    person_id_int: Optional[Union[int, str]] = Field(None, alias='person_id', exclude=True)
    user_id_int: Optional[Union[int, str]] = Field(None, alias='user_id', exclude=True)

    for_type: Optional[str]
    for_id: Optional[str] # Random ID string
    for_id_random: Optional[str] # Svelte often uses this name
    for_id_int: Optional[Union[int, str]] = Field(None, alias='for_id', exclude=True)

    code: Optional[str]
    name: Optional[str]
    description: Optional[str]

    type: Optional[str] # html, json, md, text

    # The JSON fields are case sensitive
    json_str: Optional[Union[Json, None]] = Field(
        alias = 'json',
    )

    # The text fields are case insensitive
    text: Optional[str]

    meta_json: Optional[str]
    meta_text: Optional[str]

    access: Optional[str]
    access_read: Optional[str]
    access_write: Optional[str]
    access_delete: Optional[str]

    enable: Optional[bool]

    hide: Optional[bool]
    priority: Optional[bool]
    sort: Optional[int]
    group: Optional[str]

    notes: Optional[str]

    created_on: Optional[datetime.datetime] = None
    updated_on: Optional[datetime.datetime] = None

    _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.
        """
        # 0. Scrub stringified NULLs from database
        for k, v in list(values.items()):
            if isinstance(v, str) and v.upper() == 'NULL':
                values[k] = None

        # 1. Map Random Strings to Clean Names
        if rid := values.get('id_random') or values.get('data_store_id_random'):
            values['id'] = rid
            values['data_store_id'] = rid
            
        if a_rid := values.get('account_id_random'):
            values['account_id'] = a_rid
        if p_rid := values.get('person_id_random'):
            values['person_id'] = p_rid
        if u_rid := values.get('user_id_random'):
            values['user_id'] = u_rid
        if f_rid := values.get('for_id_random'):
            values['for_id'] = f_rid
            values['for_id_random'] = f_rid
            
        # 2. Prevent "Collision Population"
        # We only want strings in our primary ID fields. 
        # If the key exists and isn't a string, it's a DB integer; remove it
        # so it doesn't fail length validation on the string fields.
        for k in ['id', 'data_store_id', 'account_id', 'person_id', 'user_id', 'for_id']:
            if k in values and not isinstance(values[k], str):
                del values[k]
                
        return values

    class Config:
        underscore_attrs_are_private = True
        allow_population_by_field_name = False
        fields = base_fields
# ### END ### API Data Store Models ### Data_Store_Base() ###