"""
Post Metrics Model - Tracking engagement metrics per post.
"""

from datetime import datetime
from sqlalchemy import Column, Integer, Float, String, DateTime, ForeignKey, Index
from sqlalchemy.orm import relationship

from app.core.database import Base


class PostMetrics(Base):
    """
    Stores engagement metrics for posts.
    Multiple records per post to track metrics over time.
    """
    __tablename__ = "post_metrics"

    id = Column(Integer, primary_key=True, index=True)
    post_id = Column(Integer, ForeignKey("posts.id", ondelete="CASCADE"), nullable=False)
    platform = Column(String(50), nullable=False)

    # Core engagement metrics
    likes = Column(Integer, default=0)
    comments = Column(Integer, default=0)
    shares = Column(Integer, default=0)  # retweets, reposts
    impressions = Column(Integer, default=0)
    reach = Column(Integer, default=0)
    saves = Column(Integer, default=0)  # bookmarks
    clicks = Column(Integer, default=0)  # link clicks
    replies = Column(Integer, default=0)
    quotes = Column(Integer, default=0)  # quote tweets

    # Calculated metrics
    engagement_rate = Column(Float, default=0.0)
    engagement_total = Column(Integer, default=0)

    # Timestamps
    recorded_at = Column(DateTime, default=datetime.utcnow, index=True)
    created_at = Column(DateTime, default=datetime.utcnow)

    # Relationships
    post = relationship("Post", back_populates="metrics_history")

    # Indexes for efficient queries
    __table_args__ = (
        Index("ix_post_metrics_post_platform", "post_id", "platform"),
        Index("ix_post_metrics_recorded", "recorded_at"),
    )

    def calculate_engagement_rate(self):
        """Calculate engagement rate based on impressions."""
        self.engagement_total = (
            self.likes + self.comments + self.shares +
            self.saves + self.replies + self.quotes
        )
        if self.impressions > 0:
            self.engagement_rate = (self.engagement_total / self.impressions) * 100
        else:
            self.engagement_rate = 0.0

    def to_dict(self):
        return {
            "id": self.id,
            "post_id": self.post_id,
            "platform": self.platform,
            "likes": self.likes,
            "comments": self.comments,
            "shares": self.shares,
            "impressions": self.impressions,
            "reach": self.reach,
            "saves": self.saves,
            "clicks": self.clicks,
            "replies": self.replies,
            "quotes": self.quotes,
            "engagement_rate": round(self.engagement_rate, 2),
            "engagement_total": self.engagement_total,
            "recorded_at": self.recorded_at.isoformat() if self.recorded_at else None
        }