"""

    AUTHOR:

        Khushal P Soonderji

    DATE:

        Friday, 6th Dec., 2024.

    OBJECTIVE:

        To provide a structure to receive auth details of various chat apps (like Telegram and WhatsApp).

    REFERENCES:

        N/A

    DOWNLOADS:

        N/A

"""


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# To make sibling directories accessible for imports:
import sys
sys.path.append(".")
sys.path.append("..")

# For making data behaviour_models:
from pydantic import BaseModel, Field, field_validator, PastDatetime, model_validator
from typing import Optional, Literal, Union

# Models:
from models.message.chat.auth import TelegramAuth, WhatsAppNimbusAuth

# My utils:
from utils_v2.string import regex
from utils_v2.date_time import date_time

# To work with date and time:
import datetime


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# ***                                           MACROS / ONE-TIME INIT                                              ***
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# RegEx Patterns:
REGEX_SESSION_TOKEN = r"^[a-f0-9]{8}-[a-f0-9]{4}-[1-5][a-f0-9]{3}-[89ab][a-f0-9]{3}-[a-f0-9]{12}$"


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# --- Nothing Yet


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# ***                                                  FUNCTIONS                                                    ***
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class ChatAuthRequestHeaders(BaseModel):

    sessionToken: str = Field(
        description = "the session token of the user who is requesting the service",
        pattern = REGEX_SESSION_TOKEN,
        frozen = True,
        alias = "X-Session-Token"
    )

    # ┏┓    ┏•
    # ┃ ┏┓┏┓╋┓┏┓
    # ┗┛┗┛┛┗┛┗┗┫
    #          ┛

    class Config:
        extra = "allow"

    def model_dump(self, *args, **kwargs):
        return super().model_dump(*args, by_alias = True, **kwargs)


# ---------------------------------------------------------------------------------------------------------------------


class ChatAuthRequestData(BaseModel):

    chatClient: Literal[
        "telegram",  # ........ Official Telegram API.
        "whatsapp",  # ........ Official WhatsApp API.
        "whatsappNimbus"  # ... Nimbus IT's unofficial WhatsApp API.
    ] = Field(alias = "client")
    auth: Union[TelegramAuth, WhatsAppNimbusAuth]

    # ┏┓    ┏•
    # ┃ ┏┓┏┓╋┓┏┓
    # ┗┛┗┛┛┗┛┗┗┫
    #          ┛

    class Config:
        extra = "forbid"

    # ┓┏  ┓• ┓   •
    # ┃┃┏┓┃┓┏┫┏┓╋┓┏┓┏┓
    # ┗┛┗┻┗┗┗┻┗┻┗┗┗┛┛┗

    @model_validator(mode = "after")
    def ensure_harmony(cls, values):
        client = values.chatClient
        auth = values.auth
        harmony_map = {
            "telegram": TelegramAuth,
            # "whatsapp": None,
            "whatsappNimbus": WhatsAppNimbusAuth
        }
        if not isinstance(auth, harmony_map[client]):
            raise ValueError(f"incorrect 'auth' for selected client '{client}'")
        return values


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# ***                                               MAIN PROGRAM                                                    ***
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if __name__ == "__main__":

    pass