from dataclasses import dataclass
from typing import Optional
import json
import os

@dataclass
class HanaConfig:
    server: str
    port: int
    database: str
    user: str
    password: str

@dataclass
class OutlookConfig:
    client_id: str 
    client_secret: str
    tenant_id: str
    from_email: str
    to_email: list[str]
    attachments_folder: str = "./attachments"
    verify_ssl: bool = True
    ca_bundle: Optional[str] = None

@dataclass
class CrystalConfig:
    path: str
    version: str

@dataclass
class PowerbiConfig:
    url: str

@dataclass
class Config:
    hana: HanaConfig
    outlook: OutlookConfig
    crystal: CrystalConfig
    powerbi: PowerbiConfig

    @staticmethod
    def load(path: str = "config.json") -> 'Config':
        if not os.path.exists(path):
            raise FileNotFoundError(f"No se encontró el archivo de configuración: {path}")
            
        with open(path, 'r', encoding='utf-8') as f:
            data = json.load(f)
        
        hana_data = data.get('hana', {})
        outlook_data = data.get('outlook', {})
        crystal_data = data.get('crystal', {})
        
        # Validar campos requeridos para HANA
        required_hana = ['server', 'port', 'database', 'user', 'password']
        for field in required_hana:
            if field not in hana_data:
                raise KeyError(f"Falta el campo requerido '{field}' en la sección 'hana' de {path}")

        # Validar campos requeridos para Outlook
        required_outlook = ['client_id', 'client_secret', 'tenant_id', 'from_email', 'to_email']
        for field in required_outlook:
            if field not in outlook_data:
                raise KeyError(f"Falta el campo requerido '{field}' en la sección 'outlook' de {path}")

        # Validar campos requeridos para Crystal
        required_crystal = ['path', 'version']
        for field in required_crystal:
            if field not in crystal_data:
                raise KeyError(f"Falta el campo requerido '{field}' en la sección 'crystal' de {path}")

        powerbi_data = data.get('powerbi', {})
        required_powerbi = ['url']
        for field in required_powerbi:
            if field not in powerbi_data:
                raise KeyError(f"Falta el campo requerido '{field}' en la sección 'powerbi' de {path}")

        hana = HanaConfig(**hana_data)
        outlook = OutlookConfig(**outlook_data)
        crystal = CrystalConfig(**crystal_data)
        powerbi=PowerbiConfig(**powerbi_data)
        
        return Config(hana=hana, outlook=outlook, crystal=crystal,powerbi=powerbi)