"""
Configuration management for ARF Demo
Updated with REAL ARF installation detection - FIXED ENUM ERROR
"""
from typing import Optional, Dict, Any, List
from enum import Enum
import os
import logging

logger = logging.getLogger(__name__)

# Try to import from pydantic-settings, fallback to pydantic
try:
    from pydantic_settings import BaseSettings
    from pydantic import Field, validator
    PYDANTIC_V2 = True
    logger.info("Using pydantic-settings for BaseSettings")
except ImportError:
    try:
        from pydantic import BaseSettings, Field, validator
        PYDANTIC_V2 = False
        logger.info("Using pydantic.BaseSettings (older version)")
    except ImportError as e:
        logger.error(f"Failed to import pydantic: {e}")
        # Create minimal fallback
        class BaseSettings:
            def __init__(self, **kwargs):
                for k, v in kwargs.items():
                    setattr(self, k, v)
        
        class Field:
            @staticmethod
            def default(value):
                return value
        
        def validator(*args, **kwargs):
            def decorator(func):
                return func
            return decorator
        
        PYDANTIC_V2 = False


class ARFMode(str, Enum):
    """ARF operation modes"""
    DEMO = "demo"
    OSS = "oss"
    ENTERPRISE = "enterprise"


class SafetyMode(str, Enum):
    """Safety modes for execution"""
    ADVISORY = "advisory"
    APPROVAL = "approval"
    AUTONOMOUS = "autonomous"


class InstallationStatus(str, Enum):
    """ARF package installation status"""
    NOT_INSTALLED = "not_installed"
    OSS_ONLY = "oss_only"
    ENTERPRISE = "enterprise"
    BOTH = "both"


class Settings(BaseSettings):
    """
    Application settings with environment variable support
    """
    
    # ===== System Mode =====
    arf_mode: str = Field(
        default="demo",  # Changed from ARFMode to string to avoid enum issues
        description="ARF operation mode: demo, oss, enterprise"
    )
    
    use_true_arf: bool = Field(
        default=True,
        description="Use true ARF integration when available"
    )
    
    # ===== Installation Status (Auto-detected) =====
    arf_oss_installed: bool = Field(
        default=False,
        description="ARF OSS package installed"
    )
    
    arf_enterprise_installed: bool = Field(
        default=False,
        description="ARF Enterprise package installed"
    )
    
    arf_oss_version: Optional[str] = Field(
        default=None,
        description="ARF OSS version if installed"
    )
    
    arf_enterprise_version: Optional[str] = Field(
        default=None,
        description="ARF Enterprise version if installed"
    )
    
    # ===== ARF Configuration =====
    arf_api_key: Optional[str] = Field(
        default=None,
        description="ARF API key for real integration"
    )
    
    arf_base_url: str = Field(
        default="https://api.arf.dev",
        description="ARF API base URL"
    )
    
    # ===== Business Configuration =====
    engineer_hourly_rate: float = Field(
        default=150.0,
        description="Engineer hourly rate in USD"
    )
    
    engineer_annual_cost: float = Field(
        default=125000.0,
        description="Engineer annual cost in USD"
    )
    
    default_savings_rate: float = Field(
        default=0.82,
        description="Default savings rate with ARF"
    )
    
    # ===== UI Configuration =====
    auto_refresh_seconds: int = Field(
        default=30,
        description="Auto-refresh interval in seconds"
    )
    
    max_history_items: int = Field(
        default=100,
        description="Maximum history items to display"
    )
    
    # ===== Demo Configuration =====
    default_scenario: str = Field(
        default="Cache Miss Storm",
        description="Default incident scenario"
    )
    
    scenario_config_path: str = Field(
        default="config/scenarios",
        description="Path to scenario configuration files"
    )
    
    # ===== Safety Configuration =====
    default_safety_mode: str = Field(
        default="advisory",  # Changed from SafetyMode to string
        description="Default safety mode: advisory, approval, autonomous"
    )
    
    require_approval: bool = Field(
        default=True,
        description="Require human approval for execution"
    )
    
    # ===== Validation =====
    @validator("arf_api_key")
    def validate_api_key(cls, v: Optional[str], values: Dict[str, Any]) -> Optional[str]:
        if values.get("arf_mode") == "enterprise" and not v:
            raise ValueError("ARF API key required for Enterprise mode")
        return v
    
    @validator("use_true_arf")
    def validate_true_arf(cls, v: bool, values: Dict[str, Any]) -> bool:
        if v and not values.get("arf_oss_installed"):
            logger.warning("True ARF requested but OSS package not installed. Using mock mode.")
            return False
        return v
    
    # ===== Installation Detection =====
    @classmethod
    def detect_installation(cls):
        """Detect ARF package installation"""
        results = {
            "oss_installed": False,
            "enterprise_installed": False,
            "oss_version": None,
            "enterprise_version": None
        }
        
        # Check OSS package
        try:
            import agentic_reliability_framework as arf_oss
            results["oss_installed"] = True
            results["oss_version"] = getattr(arf_oss, '__version__', '3.3.7')
            logger.info(f"✅ ARF OSS v{results['oss_version']} detected")
        except ImportError:
            logger.info("⚠️ ARF OSS not installed - will use mock mode")
        
        # Check Enterprise package
        try:
            import arf_enterprise
            results["enterprise_installed"] = True
            results["enterprise_version"] = getattr(arf_enterprise, '__version__', '1.0.2')
            logger.info(f"✅ ARF Enterprise v{results['enterprise_version']} detected")
        except ImportError:
            logger.info("⚠️ ARF Enterprise not installed - will use simulation")
        
        return results
    
    def get_installation_status(self) -> InstallationStatus:
        """Get current installation status"""
        if self.arf_oss_installed and self.arf_enterprise_installed:
            return InstallationStatus.BOTH
        elif self.arf_enterprise_installed:
            return InstallationStatus.ENTERPRISE
        elif self.arf_oss_installed:
            return InstallationStatus.OSS_ONLY
        else:
            return InstallationStatus.NOT_INSTALLED
    
    def get_installation_badges(self) -> Dict[str, Any]:
        """Get badge information for UI display"""
        if self.arf_oss_installed:
            oss_badge = {
                "text": f"✅ ARF OSS v{self.arf_oss_version}",
                "color": "#10b981",
                "icon": "✅"
            }
        else:
            oss_badge = {
                "text": "⚠️ Mock ARF",
                "color": "#f59e0b", 
                "icon": "⚠️"
            }
        
        if self.arf_enterprise_installed:
            enterprise_badge = {
                "text": f"🚀 Enterprise v{self.arf_enterprise_version}",
                "color": "#8b5cf6",
                "icon": "🚀"
            }
        else:
            enterprise_badge = {
                "text": "🔒 Enterprise Required",
                "color": "#64748b",
                "icon": "🔒"
            }
        
        return {
            "oss": oss_badge,
            "enterprise": enterprise_badge
        }
    
    def get_installation_recommendations(self) -> List[str]:
        """Get installation recommendations"""
        recommendations = []
        
        if not self.arf_oss_installed:
            recommendations.append(
                "Install real ARF OSS: `pip install agentic-reliability-framework==3.3.7`"
            )
        
        if not self.arf_enterprise_installed:
            recommendations.append(
                "Install ARF Enterprise: `pip install agentic-reliability-enterprise` (requires license)"
            )
        
        return recommendations
    
    class Config:
        env_file = ".env"
        env_file_encoding = "utf-8"
        case_sensitive = False


# Global settings instance with installation detection
try:
    # First detect installation
    installation_info = Settings.detect_installation()
    
    # Create settings with installation info
    settings = Settings(
        arf_oss_installed=installation_info["oss_installed"],
        arf_enterprise_installed=installation_info["enterprise_installed"],
        arf_oss_version=installation_info["oss_version"],
        arf_enterprise_version=installation_info["enterprise_version"],
    )
    
    # Log installation status
    status = settings.get_installation_status()
    logger.info(f"ARF Installation Status: {status.value}")
    
    if status == InstallationStatus.NOT_INSTALLED:
        logger.warning("No ARF packages installed. Demo will use mock mode.")
        logger.warning("For real ARF experience, install: pip install agentic-reliability-framework==3.3.7")
    
except Exception as e:
    logger.warning(f"Failed to load settings: {e}, using defaults")
    settings = Settings(
        arf_mode="demo",
        use_true_arf=False,
        arf_oss_installed=False,
        arf_enterprise_installed=False,
        engineer_hourly_rate=150.0,
        engineer_annual_cost=125000.0,
        default_savings_rate=0.82,
        auto_refresh_seconds=30,
        max_history_items=100,
        default_scenario="Cache Miss Storm",
        scenario_config_path="config/scenarios",
        default_safety_mode="advisory",
        require_approval=True
    )


def get_settings() -> Settings:
    """Get settings instance (singleton pattern)"""
    return settings


def print_installation_status():
    """Print installation status to console - SAFE VERSION"""
    try:
        s = get_settings()
        
        print("=" * 70)
        print("🚀 ARF Ultimate Investor Demo - Installation Status")
        print("=" * 70)
        
        print(f"📦 ARF OSS: {'✅ v' + s.arf_oss_version if s.arf_oss_installed else '⚠️ Not installed'}")
        print(f"🏢 Enterprise: {'✅ v' + s.arf_enterprise_version if s.arf_enterprise_installed else '⚠️ Not installed'}")
        
        # Safe string access
        print(f"🎯 Mode: {s.arf_mode.upper()}")
        print(f"🤖 Using True ARF: {'✅ Yes' if s.use_true_arf else '⚠️ Mock mode'}")
        
        recommendations = s.get_installation_recommendations()
        if recommendations:
            print("\n💡 Recommendations:")
            for rec in recommendations:
                print(f"  • {rec}")
        
        print("=" * 70)
        
    except Exception as e:
        print(f"⚠️ Could not print installation status: {e}")