"""
============================================
Database Models (Tables)
- Novel: Stores novel metadata & scraping status
- Chapter: Stores individual chapter content (English + Hindi)
============================================
"""

import enum
from datetime import datetime, timezone
from sqlalchemy import (
    Column,
    Integer,
    String,
    Text,
    DateTime,
    ForeignKey,
    Enum as SQLEnum,
    Boolean,
    Float,
    Index,
    UniqueConstraint,
)
from sqlalchemy.orm import relationship
from app.database.connection import Base


class NovelStatus(str, enum.Enum):
    QUEUED = "queued"
    LOGGING_IN = "logging_in"
    SCRAPING = "scraping"
    PAUSED_CAPTCHA = "paused_captcha"
    PAUSED_ERROR = "paused_error"
    COMPLETED = "completed"
    FAILED = "failed"


class Novel(Base):
    __tablename__ = "novels"

    id = Column(Integer, primary_key=True, autoincrement=True)
    title = Column(String(500), nullable=False, default="Unknown Novel")
    title_hindi = Column(String(500), nullable=True)  # Hindi translated title
    url = Column(String(2000), nullable=False)
    current_url = Column(String(2000), nullable=True)
    login_email = Column(String(500), nullable=True)
    login_password = Column(String(500), nullable=True)
    next_button_selector = Column(
        String(500), nullable=False,
        default="a.next_page, a[rel='next'], .next-chap, button.next-chapter"
    )
    content_selector = Column(
        String(500), nullable=False,
        default=".chapter-content, .reading-content, #chapter-content, .text-left"
    )
    status = Column(SQLEnum(NovelStatus), nullable=False, default=NovelStatus.QUEUED)
    chapters_scraped = Column(Integer, default=0)
    last_error = Column(Text, nullable=True)
    screenshot_path = Column(String(1000), nullable=True)
    needs_intervention = Column(Boolean, default=False)
    created_at = Column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc))
    updated_at = Column(
        DateTime(timezone=True),
        default=lambda: datetime.now(timezone.utc),
        onupdate=lambda: datetime.now(timezone.utc)
    )

    chapters = relationship(
        "Chapter", back_populates="novel",
        cascade="all, delete-orphan",
        order_by="Chapter.chapter_number",
        lazy="selectin",
    )

    def __repr__(self):
        return f"<Novel(id={self.id}, title='{self.title}', status={self.status})>"


class Chapter(Base):
    __tablename__ = "chapters"

    id = Column(Integer, primary_key=True, autoincrement=True)
    novel_id = Column(Integer, ForeignKey("novels.id", ondelete="CASCADE"), nullable=False, index=True)
    chapter_number = Column(Integer, nullable=False)
    title = Column(String(1000), nullable=True, default="")
    title_hindi = Column(String(1000), nullable=True)        # ✅ Hindi title
    content = Column(Text, nullable=False)                    # English content
    content_hindi = Column(Text, nullable=True)              # ✅ Hindi content
    url = Column(String(2000), nullable=True)
    word_count = Column(Integer, default=0)
    scraped_at = Column(DateTime(timezone=True), default=lambda: datetime.now(timezone.utc))

    novel = relationship("Novel", back_populates="chapters")

    __table_args__ = (
        UniqueConstraint("novel_id", "chapter_number", name="uq_novel_chapter"),
        Index("ix_chapter_novel_number", "novel_id", "chapter_number"),
    )

    def __repr__(self):
        return f"<Chapter(id={self.id}, novel_id={self.novel_id}, ch={self.chapter_number})>"