"""
Mentor Leaderboard Models - AI-powered ranking with sentiment analysis.
"""
from pydantic import BaseModel, Field
from typing import Optional, List, Dict, Any
from datetime import datetime, timezone
from enum import Enum
import uuid


class MentorLeaderboardEntry(BaseModel):
    """A mentor's ranking entry in the AI leaderboard."""
    id: str = Field(default_factory=lambda: str(uuid.uuid4()))
    mentor_id: str
    mentor_username: str
    
    # Ranking scores (0-100)
    overall_score: float = 0.0  # Weighted average of all metrics
    sentiment_score: float = 0.0  # Based on conversation sentiment analysis
    expertise_score: float = 0.0  # Based on language proficiency
    engagement_score: float = 0.0  # Based on message frequency, session count
    
    # Best programming language
    best_language: Optional[str] = None
    language_proficiency: Dict[str, float] = {}  # {"python": 85.0, "javascript": 72.0, ...}
    
    # Sentiment breakdown
    avg_sentiment_score: float = 0.0
    positive_sentiment_ratio: float = 0.0  # 0-1
    conversations_analyzed: int = 0
    
    # Expertise metrics
    total_sessions: int = 0
    total_mentees: int = 0
    avg_session_duration_minutes: float = 0.0
    
    # Leaderboard position
    rank: int = 0
    rank_change: int = 0  # +/- from last ranking
    
    # Customization/Editing
    is_custom_edited: bool = False
    custom_notes: Optional[str] = None
    manual_adjustments: Dict[str, float] = {}  # {field: adjustment_value}
    
    # Metadata
    last_updated: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
    last_edited_by: Optional[str] = None  # Maintainer username
    edit_history: List[Dict] = []  # [{timestamp, edited_by, field, old_value, new_value}]


class LeaderboardEdit(BaseModel):
    """Record of a leaderboard edit made by maintainer."""
    id: str = Field(default_factory=lambda: str(uuid.uuid4()))
    entry_id: str  # Leaderboard entry ID being edited
    mentor_id: str
    edited_by: str  # Maintainer username
    
    # What was changed
    field: str  # Which field was edited
    old_value: Any
    new_value: Any
    reason: Optional[str] = None
    
    timestamp: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))


class LeaderboardConfig(BaseModel):
    """Configuration for leaderboard generation."""
    id: str = Field(default_factory=lambda: str(uuid.uuid4()))
    
    # Weighting for overall score
    sentiment_weight: float = 0.35  # How much sentiment impacts score
    expertise_weight: float = 0.40
    engagement_weight: float = 0.25
    
    # Language detection patterns
    programming_languages: List[str] = [
        "python", "javascript", "typescript", "java", "cpp", "c++", "rust",
        "go", "ruby", "php", "swift", "kotlin", "scala", "clojure",
        "react", "vue", "angular", "django", "flask", "fastapi",
        "node", "express", "nextjs", "nuxt"
    ]
    
    # Sentiment thresholds
    positive_sentiment_threshold: float = 0.6
    negative_sentiment_threshold: float = 0.4
    
    # Session filters
    min_sessions_for_ranking: int = 1
    days_lookback: int = 90  # Only include recent conversations
    
    updated_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))


class LeaderboardResponse(BaseModel):
    """Paginated leaderboard response."""
    entries: List[MentorLeaderboardEntry]
    total_mentors: int
    timestamp: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
    config: Optional[LeaderboardConfig] = None