#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from typing import Any, Self, Optional, Sequence, Callable
from re import Match as REMatch
from inspect import FrameInfo, stack as get_stack
from Utils.Patterns import RE
from json import dumps as json_encode, loads as json_decode

class Utils:

    SPECIAL_REGULAR_EXPRESSION_CHARACTERS:dict[str, str] = {
        "\r" : "r", 
        "\n" : "n",
        "\t" : "t"
    }

    @classmethod
    def get_dictionary(cls:type[Self], *items:Sequence[Any|None]) -> dict[str, Any|None]:
        
        dictionary:dict[str, Any|None] = {}
        item:Any|None

        for item in items:
            if isinstance(item, dict):
                dictionary.update(item)
            elif isinstance(item, (list, tuple)):

                subitem:Any|None

                for subitem in item:
                    dictionary.update(cls.get_dictionary(subitem))

        return dictionary
    
    @classmethod
    def get_keys(cls:type[Self], *items:Sequence[Any|None]) -> list[str]:
        
        keys:list[str] = []
        item:Any|None

        for item in items:
            if isinstance(item, str):
                RE.KEY.match(item) and keys.append(item)
            elif isinstance(item, (list, tuple)):

                subitem:Any|None

                for subitem in item:
                    keys.extend(cls.get_keys(subitem))

        return keys
    
    @classmethod
    def get_dictionaries(cls:type[Self], *items:Sequence[Any|None]) -> list[dict[str, Any|None]]:
        
        dictionaries:list[dict[str, Any|None]] = []
        item:Any|None

        for item in items:
            if isinstance(item, dict):
                dictionaries.append(item)
            elif isinstance(item, (list, tuple)):

                subitem:Any|None

                for subitem in item:
                    dictionaries.extend(cls.get_dictionaries(subitem))

        return dictionaries
    
    @classmethod
    def get_value(cls:type[Self], 
        keys:str|Sequence[str], 
        inputs:dict[str, Any|None]|Sequence[Any|None], 
        default:Optional[Any] = None
    ) -> Any|None:
        if len(cls.get_keys(keys)):

            dictionary:dict[str, Any|None]

            for dictionary in cls.get_dictionaries(inputs):

                key:str

                for key in cls.get_keys(keys):
                    if key in dictionary:
                        return dictionary[key]
        return default
    
    @staticmethod
    def get_list(item:Any|None) -> list[Any|None]:
        return item if isinstance(item, (list, tuple)) else [item]
    
    @classmethod
    def string_variables(cls:type[Self], 
        string:str, 
        inputs:dict[str, Any|None]|Sequence[Any|None], 
        default:Optional[str] = None
    ) -> str:
        
        variables:dict[str, Any|None] = cls.get_dictionary(inputs)

        def callback(matches:REMatch) -> str:
            
            key:str = matches.group(1)

            return (
                str(variables[key]) if key in variables else 
                default if default is not None else
            matches.group(0))

        return RE.STRING_VARIABLE.sub(callback, string)
    
    @classmethod
    def get_texts(cls:type[Self], *items:list[Any|None]) -> list[str]:

        texts:list[str] = []
        item:Any|None

        for item in items:
            if isinstance(item, str):
                texts.append(item)
            elif isinstance(item, (list, tuple)):

                subitem:Any|None

                for subitem in item:
                    texts.extend(cls.get_texts(subitem))

        return texts
        
    @staticmethod
    def get_action_data(i:int = 0) -> dict[str, str|int]:

        stack:FrameInfo = get_stack()[i]

        return {
            "file" : stack.filename,
            "method" : stack.function,
            "line" : stack.lineno
        }
    
    @classmethod
    def to_regular_expression(cls:type[Self], string:str) -> str:

        def callback(matches:REMatch) -> str:

            character:str = matches.group(0)

            return "\\" + (
                cls.SPECIAL_REGULAR_EXPRESSION_CHARACTERS[character] if character in cls.SPECIAL_REGULAR_EXPRESSION_CHARACTERS else 
            character)

        return RE.TO_REGULAR_EXPRESSION.sub(callback, string)
    
    @staticmethod
    def json_decode(data:str) -> Any|None:
        try:
            return json_decode(data)
        except Exception as _:
            pass
        return None
    
    @staticmethod
    def json_encode(data:Sequence[Any|None]|dict[str, Any|None]) -> str|None:
        try:
            return json_encode(data)
        except Exception as _:
            pass
        return None

    @staticmethod
    def to_snake(string:str) -> str:

        def callback(matches:REMatch) -> str:
            
            upper:str|None = matches.group(1)

            return "_" + upper.lower() if upper else "_"
        
        return RE.TO_SNAKE.sub(callback, string).lower()

    @staticmethod
    def get_function(string:str, _from:list[str] = []) -> Optional[Callable[[Any|None], Any|None]]:

        item:Any|None
        fragments:list[str] = string.split(".")
        fragment:str
        done:bool

        for item in _from:

            done = True

            for fragment in fragments:
                if done := hasattr(item, fragment):
                    item = getattr(item, fragment)
                else:
                    break

            if done and callable(item):
                return item
            
        if done := fragments[0] in globals():

            item = globals()[fragments[0]]

            for fragment in fragments[1:]:
                if done := hasattr(item, fragment):
                    item = getattr(item, fragment)
                else:
                    break

            if done and callable(item):
                return item
            
        return None