import mysql.connector
from mysql.connector import Error
import os, re

### db
def create_connection(config):
    """ Establishes a connection to the database and returns the connection object. """
    try:
        conn = mysql.connector.connect(**config)
        if conn.is_connected():
            print("Successfully connected to the database")
            return conn
    except Error as e:
        print(f"Error connecting to MySQL: {e}")
        return None

def mysqli_return_number(conn, query):
    cursor = conn.cursor()
    cursor.execute(query)
    result = cursor.fetchone()
    cursor.close()
    return result[0] if result else 0

### Files
def save_to_file(path, data):
    with open(path, "w", encoding='utf-8', errors='ignore') as file:
        file.write(data)

def get_file_content(file_path):
    if os.path.exists(file_path):
        with open(file_path, 'r', encoding='utf8', errors='ignore') as file:
            return file.read()
    else:
        return ''

### clean text functions
def clean_text(text):
    replacements = {
        chr(8217): "'",
        "`": "'",
        "’": "'"
    }
    for orig, repl in replacements.items():
        text = text.replace(orig, repl)
    
    allowed_chars = set("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789/*-+.$*ù^£–—“”—" +
                        "µ%¨!:;,?./§&é\"'(è_çàâ)=°ç[{#}]¤~²ôûîïäëêíáã•©®€¢¥ƒÁÂÀÅÃäÄæÇÉÊÈËÍîÎñÑÓÔóÒøØõÕö" +
                        "ÖœŒšŠßðÐþÞÚúûÛùÙüÜýÝÿŸαβγδεζηθικλμνξοπρστυφχψωΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨΩ×÷" +
                        "±∓≠<>≤≥≈∝∞∫∑∈∉⊆⊇⊂⊃∪∩∧∨¬∀∃π×⨯⊗→←↑↓↔ ϒϖϑℵ⟩⟨⋅⊗⊄≅∗∉∅⇓⇑⇐↵ℜℑ℘⊕⊥∼∴∪∨∧∠∝" +
                        "∋∈∇∃∀⇔⇒∩¬∞√∑∏∂″′ªº³²¹¾½¼‰¶‡†¿§«»@")  
    text = ''.join(c if c in allowed_chars else ' ' for c in text)
    remove = ['. .', '..', "?.", "!.", ";.", "??", "? ?", ]
    for phrase in remove:
        text = text.replace(phrase, phrase[0] + ' ')
    text = re.sub(r'&nbsp;', " ", text)
    text = re.sub(r'&#(x[0-9a-fA-F]+|\d+);', ' ', text)
    text = re.sub(r'&#\d+;', ' ', text)
    text = re.sub(r'\s{2,}', ' ', text)
    replacements = {
        "À": "À", 
        "Â": "Â", 
        "Ã": "Ã", 
        "Ä": "Ä", 
        "Â": "Â", 
        "Ã…": "Å", 
        "á": "á", 
        "â": "â", 
        "ã": "ã", 
        "ä": "ä", 
        "Ã¥": "å", 
        "Ã’": "Ò", 
        "Ó": "Ó", 
        "Ô": "Ô", 
        "Õ": "Õ", 
        "Ö": "Ö", 
        "Ø": "Ø", 
        "ò": "ò", 
        "ó": "ó", 
        "ô": "ô", 
        "õ": "õ", 
        "ö": "ö", 
        "ø": "ø", 
        "È": "È", 
        "É": "É", 
        "Ê": "Ê", 
        "Ë": "Ë", 
        "è": "è", 
        "é": "é", 
        "ê": "ê", 
        "ë": "ë", 
        "Ç": "Ç", 
        "ç": "ç", 
        "ÃŒ": "Ì",  
        "ÃŽ": "Î", 
        "ì": "ì", 
        "í": "í", 
        "î": "î", 
        "ï": "ï", 
        "Ù": "Ù", 
        "Ú": "Ú", 
        "Û": "Û", 
        "Ãœ": "Ü", 
        "ù": "ù", 
        "ú": "ú", 
        "û": "û", 
        "ü": "ü", 
        "ÿ": "ÿ", 
        "Ñ": "Ñ", 
        "ñ": "ñ", 
        "Á": "Á", 
        "Í": "Í", 
        "Ã ": "à", 
        '’': '\'', 
        "«": "«", 
        '»': '»'
    }

    for key, value in replacements.items():
        text = text.replace(key, value)
    return text

def decode_unicode_escapes(s):
    def decode_match(match):
        return bytes(match.group(0), "utf-8").decode("unicode_escape")
    return re.sub(r'(\\u[0-9a-fA-F]{4})', decode_match, s)

def decode_content(content_bytes):
    for encoding in ['utf-8-sig', 'mac_roman', 'ascii', 'windows-1254', 'windows-1252']:
        try:
            return content_bytes.decode(encoding)
        except UnicodeDecodeError:
            continue
    return None