import datetime, pytz

from typing import Dict, List, Optional, Set, Union
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 Models ### Hosted_File_Base() ###
class Hosted_File_Base(BaseModel):
    log.setLevel(logging.INFO) # DEBUG, INFO, WARNING, ERROR, EXCEPTION, CRITICAL
    log.debug(locals())

    # --- Standardized Vision IDs (Strings) ---
    id: Optional[Union[int, str]] = Field(None, **base_fields['hosted_file_id_random'])
    hosted_file_id: Optional[Union[int, str]] = Field(None, **base_fields['hosted_file_id_random'])
    account_id: Optional[Union[int, str]] = Field(None, **base_fields['account_id_random'])

    hash_sha256: Optional[str]
    title: Optional[str]
    description: Optional[str]

    version: Optional[int]

    subdirectory_path: Optional[str] = Field(None, exclude=True) # NOTE: This will frequently only contain numbers, but it still needs to be a string
    filename: Optional[str]
    filename_no_ext: Optional[str]
    filename_w_ext: Optional[str]
    extension: Optional[str]
    content_type: Optional[str]
    mimetype: Optional[str]
    size: Optional[int] # In bytes

    already_exists: Optional[str] # This will probably only be populated on upload results
    copy_timer: Optional[str] # This will probably only be populated on upload results
    saved: Optional[str] # This will probably only be populated on upload results

    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

    # Including convenience data
    # This is only for convenience. Probably going to keep unless it causes a problem.
    hosted_file_found_check: Optional[bool] = Field(
        alias = 'found_check'
    )
    hosted_file_size_check: Optional[int] = Field( # File size in bytes
        alias = 'size_check'
    )

    # Including other related objects
    hosted_file_link_list: Optional[list] # Hosted_File_Base()

    _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 during READ operations.
        During CREATE (POST) operations, we ensure resolved integers are preserved.
        """
        # 1. Map Random Strings to Clean Names
        rid = values.get('id_random') or values.get('hosted_file_id_random')
        if rid and isinstance(rid, str):
            values['id'] = rid
            values['hosted_file_id'] = rid
            
        if a_rid := values.get('account_id_random'): values['account_id'] = a_rid
            
        # 2. Prevent "Collision Population" or leakage of integers during API responses
        for k in ['id', 'hosted_file_id', 'account_id']:
            val = values.get(k)
            if val is not None and not isinstance(val, str):
                if values.get(f'{k}_random') or (k=='id' and values.get('id_random')):
                    del values[k]
                
        return values

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