"""
Thread Series Models - Multi-post thread content scheduling.
"""

from datetime import datetime
from sqlalchemy import Column, Integer, String, Text, DateTime, ForeignKey, JSON, Boolean
from sqlalchemy.orm import relationship
import enum

from app.core.database import Base


class ThreadSeriesStatus(enum.Enum):
    """Status options for thread series."""
    DRAFT = "draft"
    SCHEDULED = "scheduled"
    PUBLISHING = "publishing"
    COMPLETED = "completed"
    PAUSED = "paused"
    CANCELLED = "cancelled"


class ThreadSeries(Base):
    """
    A series of related posts published as a thread.
    E.g., Educational threads, story threads, tip series.
    """
    __tablename__ = "thread_series"

    id = Column(Integer, primary_key=True, index=True)

    # Series info
    name = Column(String(255), nullable=False)
    description = Column(Text, nullable=True)
    topic = Column(String(100), nullable=True)

    # Platform (threads work best on X and Threads)
    platform = Column(String(50), nullable=False, index=True)

    # Schedule configuration
    schedule_type = Column(String(20), default="sequential")
    # sequential: posts one after another
    # timed: posts at specific intervals

    interval_minutes = Column(Integer, default=5)  # Time between posts
    start_time = Column(DateTime, nullable=True)  # When to start publishing

    # Thread structure
    total_posts = Column(Integer, default=0)
    posts_published = Column(Integer, default=0)

    # Status
    status = Column(String(20), default="draft", index=True)

    # First post in chain (for reply chain)
    first_platform_post_id = Column(String(100), nullable=True)

    # AI generation settings
    ai_generated = Column(Boolean, default=False)
    generation_prompt = Column(Text, nullable=True)

    # Metadata
    hashtags = Column(JSON, nullable=True)  # Common hashtags for the series
    created_at = Column(DateTime, default=datetime.utcnow)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
    completed_at = Column(DateTime, nullable=True)

    # Relationships
    posts = relationship("ThreadPost", back_populates="series", order_by="ThreadPost.sequence_number")

    def __repr__(self):
        return f"<ThreadSeries {self.id} - {self.name}>"

    def to_dict(self, include_posts: bool = True):
        """Convert to dictionary."""
        result = {
            "id": self.id,
            "name": self.name,
            "description": self.description,
            "topic": self.topic,
            "platform": self.platform,
            "schedule_type": self.schedule_type,
            "interval_minutes": self.interval_minutes,
            "start_time": self.start_time.isoformat() if self.start_time else None,
            "total_posts": self.total_posts,
            "posts_published": self.posts_published,
            "status": self.status,
            "ai_generated": self.ai_generated,
            "hashtags": self.hashtags,
            "created_at": self.created_at.isoformat() if self.created_at else None,
            "completed_at": self.completed_at.isoformat() if self.completed_at else None
        }

        if include_posts and self.posts:
            result["posts"] = [p.to_dict() for p in self.posts]

        return result


class ThreadPost(Base):
    """
    Individual post within a thread series.
    """
    __tablename__ = "thread_posts"

    id = Column(Integer, primary_key=True, index=True)

    # Parent series
    series_id = Column(Integer, ForeignKey("thread_series.id", ondelete="CASCADE"), nullable=False)

    # Position in thread
    sequence_number = Column(Integer, nullable=False)  # 1, 2, 3, ...

    # Content
    content = Column(Text, nullable=False)
    image_url = Column(String(500), nullable=True)

    # Associated post (once created)
    post_id = Column(Integer, ForeignKey("posts.id"), nullable=True)

    # Platform post ID (for reply chain)
    platform_post_id = Column(String(100), nullable=True)
    reply_to_platform_id = Column(String(100), nullable=True)  # ID of post to reply to

    # Schedule
    scheduled_at = Column(DateTime, nullable=True)

    # Status
    status = Column(String(20), default="pending")
    # pending, scheduled, published, failed

    error_message = Column(Text, nullable=True)
    published_at = Column(DateTime, nullable=True)

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

    # Relationships
    series = relationship("ThreadSeries", back_populates="posts")
    post = relationship("Post", backref="thread_post")

    def __repr__(self):
        return f"<ThreadPost {self.id} - Series {self.series_id} #{self.sequence_number}>"

    def to_dict(self):
        """Convert to dictionary."""
        return {
            "id": self.id,
            "series_id": self.series_id,
            "sequence_number": self.sequence_number,
            "content": self.content[:100] + "..." if len(self.content) > 100 else self.content,
            "full_content": self.content,
            "image_url": self.image_url,
            "post_id": self.post_id,
            "platform_post_id": self.platform_post_id,
            "scheduled_at": self.scheduled_at.isoformat() if self.scheduled_at else None,
            "status": self.status,
            "error_message": self.error_message,
            "published_at": self.published_at.isoformat() if self.published_at else None
        }