"""
Data models for analytics collections.
"""

import uuid
from datetime import datetime
from typing import Optional, Dict, Any
from pydantic import BaseModel, Field, field_validator

class Session(BaseModel):
    """Session analytics model"""
    session_id: str = Field(default_factory=lambda: str(uuid.uuid4()))
    start_time: datetime = Field(default_factory=datetime.utcnow)
    end_time: Optional[datetime] = None
    message_count: int = 0
    search_used: bool = False
    user_agent: Optional[str] = None
    status: str = "active"  # active, ended
    user_id: Optional[str] = None
    
    @field_validator('user_id')
    @classmethod
    def validate_user_id(cls, v):
        """Validate user_id format"""
        if v is not None:
            if not isinstance(v, str):
                raise ValueError('user_id must be a string')
            if v.strip() == '':
                return None  # Treat empty string as None (anonymous)
            if len(v) > 255:
                raise ValueError('user_id must be 255 characters or less')
            # Allow ASCII alphanumeric, hyphens, and underscores
            if not all((c.isascii() and c.isalnum()) or c in '-_' for c in v):
                raise ValueError('user_id can only contain alphanumeric characters, hyphens, and underscores')
        return v
    
    def to_dict(self) -> Dict[str, Any]:
        """Convert to dictionary for MongoDB insertion"""
        data = self.dict()
        data["_id"] = self.session_id
        return data
    
    def end_session(self):
        """Mark session as ended"""
        self.end_time = datetime.utcnow()
        self.status = "ended"
    
    @property
    def duration_seconds(self) -> Optional[int]:
        """Calculate session duration in seconds"""
        if self.end_time:
            return int((self.end_time - self.start_time).total_seconds())
        return None

class Message(BaseModel):
    """Message analytics model"""
    message_id: str = Field(default_factory=lambda: str(uuid.uuid4()))
    session_id: str
    timestamp: datetime = Field(default_factory=datetime.utcnow)
    prompt_length: int
    response_length: int
    used_search: bool = False
    response_time_ms: int
    max_tokens: int = 500
    temperature: float = 0.7
    success: bool = True
    error_message: Optional[str] = None
    user_id: Optional[str] = None
    
    @field_validator('user_id')
    @classmethod
    def validate_user_id(cls, v):
        """Validate user_id format"""
        if v is not None:
            if not isinstance(v, str):
                raise ValueError('user_id must be a string')
            if v.strip() == '':
                return None  # Treat empty string as None (anonymous)
            if len(v) > 255:
                raise ValueError('user_id must be 255 characters or less')
            # Allow ASCII alphanumeric, hyphens, and underscores
            if not all((c.isascii() and c.isalnum()) or c in '-_' for c in v):
                raise ValueError('user_id can only contain alphanumeric characters, hyphens, and underscores')
        return v
    
    def to_dict(self) -> Dict[str, Any]:
        """Convert to dictionary for MongoDB insertion"""
        data = self.dict()
        data["_id"] = self.message_id
        return data

class SearchAnalytics(BaseModel):
    """Search analytics model"""
    search_id: str = Field(default_factory=lambda: str(uuid.uuid4()))
    message_id: str
    timestamp: datetime = Field(default_factory=datetime.utcnow)
    search_query: str
    search_terms: list[str] = []
    brave_results: int = 0
    duckduckgo_results: int = 0
    total_unique_results: int = 0
    brave_response_time_ms: int = 0
    duckduckgo_response_time_ms: int = 0
    search_engines_used: list[str] = []
    search_success: bool = True
    fallback_used: bool = False
    user_id: Optional[str] = None
    
    @field_validator('user_id')
    @classmethod
    def validate_user_id(cls, v):
        """Validate user_id format"""
        if v is not None:
            if not isinstance(v, str):
                raise ValueError('user_id must be a string')
            if v.strip() == '':
                return None  # Treat empty string as None (anonymous)
            if len(v) > 255:
                raise ValueError('user_id must be 255 characters or less')
            # Allow ASCII alphanumeric, hyphens, and underscores
            if not all((c.isascii() and c.isalnum()) or c in '-_' for c in v):
                raise ValueError('user_id can only contain alphanumeric characters, hyphens, and underscores')
        return v
    
    def to_dict(self) -> Dict[str, Any]:
        """Convert to dictionary for MongoDB insertion"""
        data = self.dict()
        data["_id"] = self.search_id
        return data