"""SQLAlchemy ORM 模型 — papers, authors, tags, summaries, user data, logs, locks。"""

from datetime import date, datetime

from sqlalchemy import (
    Boolean,
    Column,
    Date,
    DateTime,
    ForeignKey,
    Index,
    Integer,
    String,
    Text,
    UniqueConstraint,
)
from sqlalchemy.orm import relationship

from app.database import Base


# ── papers ──────────────────────────────────────────────────────────────
class Paper(Base):
    __tablename__ = "papers"

    id = Column(Integer, primary_key=True, autoincrement=True)
    arxiv_id = Column(String, unique=True, nullable=False, index=True)
    title_en = Column(String, nullable=False)
    title_zh = Column(String)
    abstract = Column(Text)
    published_at = Column(Date)
    paper_date = Column(Date, nullable=False, index=True)
    crawled_at = Column(DateTime, nullable=False)
    upvotes = Column(Integer, default=0)
    hf_url = Column(String)
    arxiv_url = Column(String)
    pdf_url = Column(String)
    source_url = Column(String)
    asset_status = Column(String, default="not_downloaded")
    asset_error = Column(String)
    meta_path = Column(String)
    summary_path = Column(String)
    raw_output_path = Column(String)
    summary_quality = Column(String)

    authors = relationship("PaperAuthor", back_populates="paper", cascade="all, delete-orphan")
    tags = relationship("PaperTag", back_populates="paper", cascade="all, delete-orphan")
    summary = relationship("PaperSummary", back_populates="paper", uselist=False, cascade="all, delete-orphan")
    summary_status = relationship("SummaryStatus", back_populates="paper", uselist=False, cascade="all, delete-orphan")
    bookmark = relationship("UserBookmark", back_populates="paper", uselist=False, cascade="all, delete-orphan")
    reading_status = relationship("UserReadingStatus", back_populates="paper", uselist=False, cascade="all, delete-orphan")
    note = relationship("UserNote", back_populates="paper", uselist=False, cascade="all, delete-orphan")


# ── paper_authors ───────────────────────────────────────────────────────
class PaperAuthor(Base):
    __tablename__ = "paper_authors"
    __table_args__ = (UniqueConstraint("paper_id", "name"),)

    id = Column(Integer, primary_key=True, autoincrement=True)
    paper_id = Column(Integer, ForeignKey("papers.id", ondelete="CASCADE"), nullable=False)
    name = Column(String, nullable=False)
    position = Column(Integer, default=0)

    paper = relationship("Paper", back_populates="authors")


# ── paper_tags ──────────────────────────────────────────────────────────
class PaperTag(Base):
    __tablename__ = "paper_tags"
    __table_args__ = (UniqueConstraint("paper_id", "tag", "source"),)

    id = Column(Integer, primary_key=True, autoincrement=True)
    paper_id = Column(Integer, ForeignKey("papers.id", ondelete="CASCADE"), nullable=False)
    tag = Column(String, nullable=False)
    source = Column(String, default="hf")

    paper = relationship("Paper", back_populates="tags")


# ── paper_summaries ─────────────────────────────────────────────────────
class PaperSummary(Base):
    __tablename__ = "paper_summaries"

    paper_id = Column(Integer, ForeignKey("papers.id", ondelete="CASCADE"), primary_key=True)
    one_line = Column(Text)
    difficulty = Column(String)
    prerequisites_json = Column(Text)
    motivation_problem = Column(Text)
    motivation_goal = Column(Text)
    motivation_gap = Column(Text)
    method_overview = Column(Text)
    method_key_idea = Column(Text)
    method_steps_json = Column(Text)
    method_novelty = Column(Text)
    results_main_json = Column(Text)
    results_benchmarks_json = Column(Text)
    limitations_json = Column(Text)
    weaknesses_json = Column(Text)
    future_work_json = Column(Text)
    reproducibility = Column(String)
    full_json = Column(Text, nullable=False)
    updated_at = Column(DateTime, nullable=False)

    paper = relationship("Paper", back_populates="summary")


# ── summary_status ──────────────────────────────────────────────────────
class SummaryStatus(Base):
    __tablename__ = "summary_status"
    __table_args__ = (UniqueConstraint("paper_id"),)

    id = Column(Integer, primary_key=True, autoincrement=True)
    paper_id = Column(Integer, ForeignKey("papers.id", ondelete="CASCADE"), nullable=False)
    status = Column(String, nullable=False, default="pending")
    quality = Column(String)
    error_type = Column(String)
    error = Column(Text)
    retry_count = Column(Integer, default=0)
    raw_output_saved = Column(Boolean, default=False)
    started_at = Column(DateTime)
    completed_at = Column(DateTime)

    paper = relationship("Paper", back_populates="summary_status")


# ── crawl_logs ──────────────────────────────────────────────────────────
class CrawlLog(Base):
    __tablename__ = "crawl_logs"

    id = Column(Integer, primary_key=True, autoincrement=True)
    task = Column(String, nullable=False)
    status = Column(String, nullable=False)
    date = Column(Date)
    papers_found = Column(Integer)
    papers_new = Column(Integer)
    error = Column(Text)
    started_at = Column(DateTime, nullable=False)
    completed_at = Column(DateTime)


# ── task_locks ──────────────────────────────────────────────────────────
class TaskLock(Base):
    __tablename__ = "task_locks"

    id = Column(Integer, primary_key=True, autoincrement=True)
    task = Column(String, nullable=False)
    lock_key = Column(String, nullable=False)
    status = Column(String, nullable=False)
    owner = Column(String)
    acquired_at = Column(DateTime, nullable=False)
    released_at = Column(DateTime)


# ── user data ──────────────────────────────────────────────────────────
class UserBookmark(Base):
    __tablename__ = "user_bookmarks"
    __table_args__ = (UniqueConstraint("paper_id"),)

    id = Column(Integer, primary_key=True, autoincrement=True)
    paper_id = Column(Integer, ForeignKey("papers.id", ondelete="CASCADE"), nullable=False)
    note = Column(Text)
    created_at = Column(DateTime, nullable=False)

    paper = relationship("Paper", back_populates="bookmark")


class UserReadingStatus(Base):
    __tablename__ = "user_reading_status"
    __table_args__ = (UniqueConstraint("paper_id"),)

    id = Column(Integer, primary_key=True, autoincrement=True)
    paper_id = Column(Integer, ForeignKey("papers.id", ondelete="CASCADE"), nullable=False)
    status = Column(String, nullable=False, default="unread")
    updated_at = Column(DateTime, nullable=False)

    paper = relationship("Paper", back_populates="reading_status")


class UserNote(Base):
    __tablename__ = "user_notes"
    __table_args__ = (UniqueConstraint("paper_id"),)

    id = Column(Integer, primary_key=True, autoincrement=True)
    paper_id = Column(Integer, ForeignKey("papers.id", ondelete="CASCADE"), nullable=False)
    content = Column(Text, nullable=False)
    created_at = Column(DateTime, nullable=False)
    updated_at = Column(DateTime, nullable=False)

    paper = relationship("Paper", back_populates="note")


# ── data_delete_jobs ───────────────────────────────────────────────────
class DataDeleteJob(Base):
    __tablename__ = "data_delete_jobs"

    id = Column(Integer, primary_key=True, autoincrement=True)
    date_start = Column(Date, nullable=False)
    date_end = Column(Date, nullable=False)
    include_notes = Column(Boolean, default=True)
    paper_count = Column(Integer, default=0)
    status = Column(String, nullable=False)
    error = Column(Text)
    started_at = Column(DateTime, nullable=False)
    completed_at = Column(DateTime)