import csv
import requests
from io import StringIO
#
from typing import List, Dict, Any
import os
from dotenv import load_dotenv

load_dotenv()


class Settings:
    """configuration"""
    CSV_DOWNLOAD_TIMEOUT = int(os.getenv('CSV_DOWNLOAD_TIMEOUT', 30))
    CSV_MAX_SIZE_MB = int(os.getenv('CSV_MAX_SIZE_MB', 10))

settings = Settings()


class CSVExtractor:
    """Extract raw data of CSV"""

    @staticmethod
    def download_csv(url: str) -> str:
        """ Download CSV of URL"""
        try: 

            response = requests.get(url, timeout=30)
            response.raise_for_status()

            encoding = response.encoding or 'utf-8'
            content = response.text
            return content, encoding
        except Exception as e:
            raise Exception(f"Error Download CSV: {str(e)}")
        
    
    @staticmethod
    def read_csv(content: str) -> List[Dict[str, Any]]:
        """ Converts CSV to list of dictionary"""
        csv_file = StringIO(content)
        #detect delimiter auto
        sample = csv_file.read(1024)
        csv_file.seek(0)
        try:
            dialect = csv.Sniffer().sniff(sample)
            reader  =csv.DictReader(csv_file, dialect=dialect)
        except:
            csv_file.seek(0)
            reader = csv.DictReader(csv_file)
        
        rows = [row for row in reader]

        if rows: 
            clean_row = {}

            for key, value in rows[0].items():

                if key is not None:
                    clean_key = key.strip().replace('"', '').replace("'", "").replace('\ufeff', '')
                else:
                    clean_key = ''
            
                clean_row[clean_key] = value

            for i, row in enumerate(rows):
                new_row = {}
                for old_key, value in row.items():
                    if old_key is not None:
                        new_key = old_key.strip().replace('"', '').replace("'", "").replace('\ufeff', '')
                    else: 
                        new_key = ''
                    #FIX: manage value None for avoid error strip
                    if value is not None and isinstance(value, str):
                        new_value = value.strip()
                    else:
                        new_value = value

                    new_row[new_key] = value
                rows[i] = new_row
        return rows