"""
Identity Provider (IdP) Integration for LogicPwn.

Provides integration with external identity providers including:
- Generic OIDC providers
- Enterprise identity systems
- Social login providers
- Custom IdP implementations
- Federation protocols
- Attribute mapping and transformation

Features:
- Multi-IdP support
- Dynamic provider discovery
- Attribute mapping
- Session federation
- Provider-specific optimizations
- Fallback authentication chains
"""

import time
from abc import ABC, abstractmethod
from dataclasses import dataclass, field
from typing import Any, Optional, Union
from urllib.parse import urlencode

import requests
from loguru import logger
from pydantic import BaseModel, Field, field_validator

from logicpwn.core.performance import monitor_performance
from logicpwn.exceptions import AuthenticationError, NetworkError, ValidationError

from .jwt_handler import JWTClaims, JWTConfig, JWTHandler

# OAuth and SAML handlers removed - functionality not fully implemented
# from .oauth_handler import OAuthConfig, OAuthHandler, OAuthToken
# from .saml_handler import SAMLConfig, SAMLHandler


@dataclass
class UserProfile:
    """Unified user profile from IdP."""

    user_id: str
    email: Optional[str] = None
    username: Optional[str] = None
    first_name: Optional[str] = None
    last_name: Optional[str] = None
    display_name: Optional[str] = None
    avatar_url: Optional[str] = None
    roles: list[str] = field(default_factory=list)
    groups: list[str] = field(default_factory=list)
    custom_attributes: dict[str, Any] = field(default_factory=dict)
    provider: Optional[str] = None
    raw_profile: dict[str, Any] = field(default_factory=dict)


@dataclass
class AuthenticationSession:
    """Authentication session from IdP."""

    session_id: str
    user_profile: UserProfile
    provider: str
    access_token: Optional[str] = None
    refresh_token: Optional[str] = None
    id_token: Optional[str] = None
    expires_at: Optional[float] = None
    session_data: dict[str, Any] = field(default_factory=dict)

    @property
    def is_expired(self) -> bool:
        """Check if session is expired."""
        if not self.expires_at:
            return False
        return time.time() >= self.expires_at


class AttributeMapping(BaseModel):
    """Attribute mapping configuration."""

    user_id: Union[str, list[str]] = Field(
        default=["sub", "id", "user_id"], description="User ID mapping"
    )
    email: Union[str, list[str]] = Field(
        default=["email", "mail", "emailAddress"], description="Email mapping"
    )
    username: Union[str, list[str]] = Field(
        default=["preferred_username", "username", "login"],
        description="Username mapping",
    )
    first_name: Union[str, list[str]] = Field(
        default=["given_name", "firstName", "first_name"],
        description="First name mapping",
    )
    last_name: Union[str, list[str]] = Field(
        default=["family_name", "lastName", "last_name"],
        description="Last name mapping",
    )
    display_name: Union[str, list[str]] = Field(
        default=["name", "displayName", "display_name"],
        description="Display name mapping",
    )
    avatar_url: Union[str, list[str]] = Field(
        default=["picture", "avatar_url", "photo"], description="Avatar URL mapping"
    )
    roles: Union[str, list[str]] = Field(
        default=["roles", "role", "authorities"], description="Roles mapping"
    )
    groups: Union[str, list[str]] = Field(
        default=["groups", "group", "memberOf"], description="Groups mapping"
    )

    def extract_value(self, data: dict[str, Any], field_name: str) -> Any:
        """Extract value from data using field mapping."""
        mapping = getattr(self, field_name)

        if isinstance(mapping, str):
            mapping = [mapping]

        for key in mapping:
            if key in data:
                return data[key]

        return None


class IdPConfig(BaseModel):
    """Identity Provider configuration."""

    # Provider identification
    provider_id: str = Field(..., description="Unique provider identifier")
    provider_name: str = Field(..., description="Human-readable provider name")
    provider_type: str = Field(
        ..., description="Provider type (oidc, saml, oauth2, custom)"
    )

    # Provider endpoints
    discovery_url: Optional[str] = Field(default=None, description="OIDC discovery URL")
    authorization_url: Optional[str] = Field(
        default=None, description="Authorization endpoint"
    )
    token_url: Optional[str] = Field(default=None, description="Token endpoint")
    userinfo_url: Optional[str] = Field(default=None, description="UserInfo endpoint")
    logout_url: Optional[str] = Field(default=None, description="Logout endpoint")

    # Authentication configuration
    client_id: str = Field(..., description="Client ID")
    client_secret: Optional[str] = Field(default=None, description="Client secret")
    scope: list[str] = Field(default_factory=list, description="OAuth scopes")

    # Provider-specific settings
    provider_config: dict[str, Any] = Field(
        default_factory=dict, description="Provider-specific configuration"
    )

    # Attribute mapping
    attribute_mapping: AttributeMapping = Field(
        default_factory=AttributeMapping, description="Attribute mapping"
    )

    # Security settings
    validate_issuer: bool = Field(default=True, description="Validate token issuer")
    validate_audience: bool = Field(default=True, description="Validate token audience")
    require_https: bool = Field(default=True, description="Require HTTPS endpoints")

    # Session settings
    session_timeout: int = Field(default=3600, description="Session timeout in seconds")
    remember_me_timeout: int = Field(
        default=86400 * 30, description="Remember me timeout in seconds"
    )

    @field_validator("provider_type")
    @classmethod
    def validate_provider_type(cls, v: str) -> str:
        valid_types = ["oidc", "saml", "oauth2", "custom"]
        if v not in valid_types:
            raise ValueError(f"Invalid provider type. Must be one of: {valid_types}")
        return v


class BaseIdPProvider(ABC):
    """Base class for identity providers."""

    def __init__(self, config: IdPConfig, session: Optional[requests.Session] = None):
        self.config = config
        self.session = session or requests.Session()

    @abstractmethod
    def get_authorization_url(
        self, state: Optional[str] = None, **kwargs
    ) -> tuple[str, str]:
        """Get authorization URL for user redirection."""

    @abstractmethod
    def handle_callback(self, callback_data: dict[str, Any]) -> AuthenticationSession:
        """Handle authentication callback."""

    @abstractmethod
    def get_user_profile(self, session: AuthenticationSession) -> UserProfile:
        """Get user profile information."""

    @abstractmethod
    def refresh_session(self, session: AuthenticationSession) -> AuthenticationSession:
        """Refresh authentication session."""

    @abstractmethod
    def logout(self, session: AuthenticationSession) -> bool:
        """Logout user session."""

    def _map_attributes(self, raw_data: dict[str, Any]) -> UserProfile:
        """Map raw attributes to UserProfile."""
        mapping = self.config.attribute_mapping

        user_id = mapping.extract_value(raw_data, "user_id")
        if not user_id:
            raise ValidationError("No user ID found in provider response")

        # Extract standard attributes
        profile = UserProfile(
            user_id=str(user_id),
            email=mapping.extract_value(raw_data, "email"),
            username=mapping.extract_value(raw_data, "username"),
            first_name=mapping.extract_value(raw_data, "first_name"),
            last_name=mapping.extract_value(raw_data, "last_name"),
            display_name=mapping.extract_value(raw_data, "display_name"),
            avatar_url=mapping.extract_value(raw_data, "avatar_url"),
            provider=self.config.provider_id,
            raw_profile=raw_data,
        )

        # Extract roles and groups
        roles = mapping.extract_value(raw_data, "roles")
        if roles:
            if isinstance(roles, str):
                profile.roles = [roles]
            elif isinstance(roles, list):
                profile.roles = [str(role) for role in roles]

        groups = mapping.extract_value(raw_data, "groups")
        if groups:
            if isinstance(groups, str):
                profile.groups = [groups]
            elif isinstance(groups, list):
                profile.groups = [str(group) for group in groups]

        # Extract custom attributes
        standard_fields = {
            "user_id",
            "email",
            "username",
            "first_name",
            "last_name",
            "display_name",
            "avatar_url",
            "roles",
            "groups",
        }

        profile.custom_attributes = {
            k: v for k, v in raw_data.items() if k not in standard_fields
        }

        return profile


class OIDCProvider(BaseIdPProvider):
    """OpenID Connect identity provider."""

    def __init__(self, config: IdPConfig, session: Optional[requests.Session] = None):
        super().__init__(config, session)

        # Initialize OAuth handler
        self._create_oauth_config()
        # self.oauth_handler = OAuthHandler(oauth_config, session)  # OAuth not implemented

        # Initialize JWT handler if needed
        if config.provider_config.get("validate_id_token", True):
            jwt_config = self._create_jwt_config()
            self.jwt_handler = JWTHandler(jwt_config, session)
        else:
            self.jwt_handler = None

    def _create_oauth_config(self):  # -> OAuthConfig:  # OAuth not implemented
        """Create OAuth configuration from IdP config."""
        # Auto-discover endpoints if discovery URL provided
        if self.config.discovery_url:
            try:
                discovery = self._fetch_discovery_document()
                authorization_url = discovery.get(
                    "authorization_endpoint", self.config.authorization_url
                )
                discovery.get("token_endpoint", self.config.token_url)
                userinfo_url = discovery.get(
                    "userinfo_endpoint", self.config.userinfo_url
                )
            except Exception as e:
                logger.warning(f"Failed to fetch discovery document: {e}")
                self.config.authorization_url
                self.config.token_url
                self.config.userinfo_url
        else:
            self.config.authorization_url
            self.config.token_url
            self.config.userinfo_url

        # return OAuthConfig(  # OAuth not implemented
        #     client_id=self.config.client_id,
        #     client_secret=self.config.client_secret,
        #     authorization_url=authorization_url,
        #     token_url=token_url,
        #     userinfo_url=userinfo_url,
        #     scope=self.config.scope or ["openid", "profile", "email"],
        #     **self.config.provider_config,
        # )
        return None  # Placeholder

    def _create_jwt_config(self) -> JWTConfig:
        """Create JWT configuration for ID token validation."""
        try:
            discovery = self._fetch_discovery_document()

            return JWTConfig(
                jwks_url=discovery.get("jwks_uri"),
                expected_issuer=(
                    discovery.get("issuer") if self.config.validate_issuer else None
                ),
                expected_audience=(
                    self.config.client_id if self.config.validate_audience else None
                ),
                algorithms=discovery.get(
                    "id_token_signing_alg_values_supported", ["RS256"]
                ),
            )
        except Exception as e:
            logger.error(f"Failed to fetch discovery document for JWT config: {e}")
            # SECURITY: Never use hardcoded secrets in production
            raise ValidationError(
                f"Cannot create JWT config without valid discovery document: {e}"
            )

    @monitor_performance("oidc_discovery")
    def _fetch_discovery_document(self) -> dict[str, Any]:
        """Fetch OIDC discovery document."""
        if not self.config.discovery_url:
            raise ValidationError("No discovery URL configured")

        try:
            response = self.session.get(self.config.discovery_url, timeout=30)
            response.raise_for_status()
            return response.json()
        except Exception as e:
            raise NetworkError(f"Failed to fetch discovery document: {e}")

    def get_authorization_url(
        self, state: Optional[str] = None, **kwargs
    ) -> tuple[str, str]:
        """Get OIDC authorization URL."""
        # return self.oauth_handler.get_authorization_url()  # OAuth not implemented
        raise NotImplementedError("OAuth not implemented")

    @monitor_performance("oidc_callback_handling")
    def handle_callback(self, callback_data: dict[str, Any]) -> AuthenticationSession:
        """Handle OIDC callback."""
        code = callback_data.get("code")
        callback_data.get("state")

        if not code:
            error = callback_data.get("error", "unknown_error")
            error_description = callback_data.get(
                "error_description", "No authorization code received"
            )
            raise AuthenticationError(f"OIDC error: {error} - {error_description}")

        # Exchange code for tokens
        # token = self.oauth_handler.exchange_code_for_token(code, state)  # OAuth not implemented
        raise NotImplementedError("OAuth not implemented")

        # Validate ID token if present
        id_token_claims = None
        if token.id_token and self.jwt_handler:
            try:
                id_token_claims = self.jwt_handler.validate_token(token.id_token)
            except Exception as e:
                logger.warning(f"ID token validation failed: {e}")

        # Get user profile
        user_profile = self._get_user_profile_from_token(token, id_token_claims)

        # Create session
        session = AuthenticationSession(
            session_id=f"oidc_{int(time.time())}_{user_profile.user_id}",
            user_profile=user_profile,
            provider=self.config.provider_id,
            access_token=token.access_token,
            refresh_token=token.refresh_token,
            id_token=token.id_token,
            expires_at=token.expires_at,
            session_data={"token": token},
        )

        logger.info(f"OIDC authentication successful for user: {user_profile.user_id}")
        return session

    def _get_user_profile_from_token(
        self,
        token,
        id_token_claims: Optional[JWTClaims] = None,  # OAuthToken not implemented
    ) -> UserProfile:
        """Get user profile from token and claims."""
        # Start with ID token claims if available
        profile_data = {}
        if id_token_claims:
            profile_data.update(id_token_claims.custom_claims)
            if id_token_claims.sub:
                profile_data["sub"] = id_token_claims.sub

        # Fetch additional data from UserInfo endpoint if available
        # if self.oauth_handler.config.userinfo_url:  # OAuth not implemented
        #     try:
        #         userinfo = self.oauth_handler.get_user_info()
        #         profile_data.update(userinfo)
        #     except Exception as e:
        #         logger.warning(f"Failed to fetch UserInfo: {e}")
        # OAuth not implemented

        return self._map_attributes(profile_data)

    def get_user_profile(self, session: AuthenticationSession) -> UserProfile:
        """Get current user profile."""
        return session.user_profile

    def refresh_session(self, session: AuthenticationSession) -> AuthenticationSession:
        """Refresh OIDC session."""
        if not session.refresh_token:
            raise AuthenticationError("No refresh token available")

        # Refresh OAuth token
        # self.oauth_handler.token = session.session_data.get("token")  # OAuth not implemented
        # new_token = self.oauth_handler.refresh_access_token()  # OAuth not implemented
        raise NotImplementedError("OAuth not implemented")

        # Update session
        session.access_token = new_token.access_token
        session.expires_at = new_token.expires_at
        if new_token.refresh_token:
            session.refresh_token = new_token.refresh_token
        if new_token.id_token:
            session.id_token = new_token.id_token

        session.session_data["token"] = new_token

        logger.info(f"Refreshed OIDC session for user: {session.user_profile.user_id}")
        return session

    def logout(self, session: AuthenticationSession) -> bool:
        """Logout OIDC session."""
        # Revoke tokens
        if session.access_token:
            # self.oauth_handler.token = session.session_data.get("token")  # OAuth not implemented
            # self.oauth_handler.revoke_token(session.access_token)  # OAuth not implemented
            # OAuth not implemented
            pass

        # Perform end session if endpoint available
        if self.config.logout_url:
            try:
                params = {}
                if session.id_token:
                    params["id_token_hint"] = session.id_token

                logout_url = f"{self.config.logout_url}?{urlencode(params)}"
                response = self.session.get(logout_url, timeout=10)

                logger.info(
                    f"OIDC logout successful for user: {session.user_profile.user_id}"
                )
                return response.status_code < 400

            except Exception as e:
                logger.warning(f"OIDC logout failed: {e}")
                return False

        return True


class SAMLIdPProvider(BaseIdPProvider):
    """SAML identity provider."""

    def __init__(self, config: IdPConfig, session: Optional[requests.Session] = None):
        super().__init__(config, session)

        # Create SAML configuration
        self._create_saml_config()
        # self.saml_handler = SAMLHandler(saml_config, session)  # SAML not implemented

    def _create_saml_config(self):  # -> SAMLConfig:  # SAML not implemented
        """Create SAML configuration from IdP config."""
        self.config.provider_config

        # return SAMLConfig(  # SAML not implemented
        #     sp_entity_id=provider_config["sp_entity_id"],
        #     sp_acs_url=provider_config["sp_entity_id"],
        #     idp_entity_id=provider_config["idp_entity_id"],
        #     idp_sso_url=self.config.authorization_url,
        #     idp_slo_url=self.config.logout_url,
        #     **{
        #         k: v
        #         for k, v in provider_config.items()
        #         if k not in ["sp_entity_id", "sp_acs_url", "idp_entity_id"]
        #     },
        # )
        return None  # Placeholder

    def get_authorization_url(
        self, state: Optional[str] = None, **kwargs
    ) -> tuple[str, str]:
        """Get SAML authorization URL."""
        # return self.saml_handler.create_auth_request()  # SAML not implemented
        raise NotImplementedError("SAML not implemented")

    def handle_callback(self, callback_data: dict[str, Any]) -> AuthenticationSession:
        """Handle SAML callback."""
        saml_response = callback_data.get("SAMLResponse")
        callback_data.get("RelayState")

        if not saml_response:
            raise AuthenticationError("No SAML response received")

        # Process SAML response
        # assertion = self.saml_handler.process_saml_response(saml_response, relay_state)  # SAML not implemented
        raise NotImplementedError("SAML not implemented")

        # Map attributes to user profile
        profile_data = {"sub": assertion.subject_name_id, **assertion.attributes}

        user_profile = self._map_attributes(profile_data)

        # Create session
        session = AuthenticationSession(
            session_id=f"saml_{int(time.time())}_{user_profile.user_id}",
            user_profile=user_profile,
            provider=self.config.provider_id,
            expires_at=(
                assertion.not_on_or_after.timestamp()
                if assertion.not_on_or_after
                else None
            ),
            session_data={"assertion": assertion},
        )

        logger.info(f"SAML authentication successful for user: {user_profile.user_id}")
        return session

    def get_user_profile(self, session: AuthenticationSession) -> UserProfile:
        """Get current user profile."""
        return session.user_profile

    def refresh_session(self, session: AuthenticationSession) -> AuthenticationSession:
        """SAML sessions typically don't support refresh."""
        raise AuthenticationError("SAML sessions do not support refresh")

    def logout(self, session: AuthenticationSession) -> bool:
        """Logout SAML session."""
        if not self.config.logout_url:
            return True

        assertion = session.session_data.get("assertion")
        if assertion:
            # logout_url, relay_state = self.saml_handler.create_logout_request(  # SAML not implemented
            #     assertion.subject_name_id, assertion.session_index
            # )
            raise NotImplementedError("SAML not implemented")

            # TODO: Implement proper SAML logout redirection for production use
            # This placeholder just logs the URL instead of performing actual logout
            logger.warning(
                f"SAML logout not fully implemented - would redirect to: {logout_url}"
            )
            # In production, this should perform actual logout redirection
            raise NotImplementedError(
                "SAML logout redirection not implemented for production use"
            )

        return False


class IdPManager:
    """
    Identity Provider manager for multi-IdP support.

    Features:
    - Multiple IdP support
    - Dynamic provider selection
    - Session federation
    - Provider failover
    - Centralized user management
    """

    def __init__(self, session: Optional[requests.Session] = None):
        self.session = session or requests.Session()
        self.providers: dict[str, BaseIdPProvider] = {}
        self.active_sessions: dict[str, AuthenticationSession] = {}

    def register_provider(self, config: IdPConfig) -> BaseIdPProvider:
        """Register identity provider."""
        if config.provider_type == "oidc":
            provider = OIDCProvider(config, self.session)
        elif config.provider_type == "saml":
            provider = SAMLIdPProvider(config, self.session)
        else:
            raise ValidationError(f"Unsupported provider type: {config.provider_type}")

        self.providers[config.provider_id] = provider
        logger.info(f"Registered IdP: {config.provider_name} ({config.provider_id})")

        return provider

    def get_provider(self, provider_id: str) -> BaseIdPProvider:
        """Get provider by ID."""
        provider = self.providers.get(provider_id)
        if not provider:
            raise ValidationError(f"Provider not found: {provider_id}")
        return provider

    def list_providers(self) -> list[dict[str, str]]:
        """List available providers."""
        return [
            {
                "provider_id": provider.config.provider_id,
                "provider_name": provider.config.provider_name,
                "provider_type": provider.config.provider_type,
            }
            for provider in self.providers.values()
        ]

    @monitor_performance("idp_authentication")
    def authenticate(
        self, provider_id: str, callback_data: dict[str, Any]
    ) -> AuthenticationSession:
        """Authenticate user with specified provider."""
        provider = self.get_provider(provider_id)
        session = provider.handle_callback(callback_data)

        # Store active session
        self.active_sessions[session.session_id] = session

        return session

    def get_session(self, session_id: str) -> Optional[AuthenticationSession]:
        """Get active session by ID."""
        return self.active_sessions.get(session_id)

    def refresh_session(self, session_id: str) -> AuthenticationSession:
        """Refresh session."""
        session = self.get_session(session_id)
        if not session:
            raise AuthenticationError("Session not found")

        provider = self.get_provider(session.provider)
        refreshed_session = provider.refresh_session(session)

        # Update stored session
        self.active_sessions[session_id] = refreshed_session

        return refreshed_session

    def logout(self, session_id: str) -> bool:
        """Logout session."""
        session = self.get_session(session_id)
        if not session:
            return False

        provider = self.get_provider(session.provider)
        success = provider.logout(session)

        # Remove from active sessions
        if session_id in self.active_sessions:
            del self.active_sessions[session_id]

        return success

    def cleanup_expired_sessions(self):
        """Clean up expired sessions."""
        time.time()
        expired_sessions = [
            session_id
            for session_id, session in self.active_sessions.items()
            if session.is_expired
        ]

        for session_id in expired_sessions:
            del self.active_sessions[session_id]

        if expired_sessions:
            logger.debug(f"Cleaned up {len(expired_sessions)} expired IdP sessions")


# Convenience functions for common providers


def create_google_idp_config(client_id: str, client_secret: str, **kwargs) -> IdPConfig:
    """Create Google OIDC provider configuration."""
    return IdPConfig(
        provider_id="google",
        provider_name="Google",
        provider_type="oidc",
        discovery_url="https://accounts.google.com/.well-known/openid_configuration",
        client_id=client_id,
        client_secret=client_secret,
        scope=["openid", "email", "profile"],
        **kwargs,
    )


def create_microsoft_idp_config(
    client_id: str, client_secret: str, tenant: str = "common", **kwargs
) -> IdPConfig:
    """Create Microsoft Azure AD provider configuration."""
    return IdPConfig(
        provider_id="microsoft",
        provider_name="Microsoft",
        provider_type="oidc",
        discovery_url=f"https://login.microsoftonline.com/{tenant}/v2.0/.well-known/openid_configuration",
        client_id=client_id,
        client_secret=client_secret,
        scope=["openid", "email", "profile"],
        **kwargs,
    )


def create_okta_idp_config(
    client_id: str, client_secret: str, okta_domain: str, **kwargs
) -> IdPConfig:
    """Create Okta OIDC provider configuration."""
    return IdPConfig(
        provider_id="okta",
        provider_name="Okta",
        provider_type="oidc",
        discovery_url=f"https://{okta_domain}/.well-known/openid_configuration",
        client_id=client_id,
        client_secret=client_secret,
        scope=["openid", "email", "profile"],
        **kwargs,
    )
