import os
from sqlalchemy import create_engine, Column, Integer, String, Text, DateTime, Enum, ForeignKey, JSON, Boolean
from sqlalchemy.orm import sessionmaker, declarative_base, relationship
from sqlalchemy.sql import func
import enum

def _sqlite_url() -> str:
    # HF Spaces: /data が永続、次に /tmp
    for path in ("/data/app.db", "/tmp/app.db", "./app.db"):
        try:
            d = os.path.dirname(path) or "."
            os.makedirs(d, exist_ok=True)
            test = path + ".touch"
            with open(test, "w") as f: f.write("ok")
            os.remove(test)
            return f"sqlite+pysqlite:///{path}"
        except Exception:
            continue
    return "sqlite+pysqlite:///./app.db"

DATABASE_URL = os.getenv("DATABASE_URL", _sqlite_url())
IS_SQLITE = DATABASE_URL.startswith("sqlite+")

engine = create_engine(
    DATABASE_URL,
    pool_pre_ping=not IS_SQLITE,
    future=True,
    connect_args={"check_same_thread": False} if IS_SQLITE else {},
)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine, future=True)
Base = declarative_base()

class Tone(str, enum.Enum):
    neutral = "neutral"
    formal = "formal"
    friendly = "friendly"
    investor = "investor"
    pr_bold = "pr_bold"

class ContentType(str, enum.Enum):
    press_release = "press_release"
    ir_letter = "ir_letter"
    investor_summary = "investor_summary"

class DraftStatus(str, enum.Enum):
    draft = "draft"
    pending = "pending"
    approved = "approved"
    scheduled = "scheduled"
    sent = "sent"

class Draft(Base):
    __tablename__ = "drafts"
    id = Column(Integer, primary_key=True, index=True)
    source_type = Column(String(20))
    source_ref = Column(Text)
    raw_text = Column(Text)
    content_type = Column(Enum(ContentType), nullable=False)
    tone = Column(Enum(Tone), nullable=False, default=Tone.neutral)
    title = Column(String(300))
    body_md = Column(Text)
    status = Column(Enum(DraftStatus), nullable=False, default=DraftStatus.draft)
    created_at = Column(DateTime(timezone=True), server_default=func.now())
    updated_at = Column(DateTime(timezone=True), onupdate=func.now())

    subject_a = Column(String(300))
    subject_b = Column(String(300))

    deliver_email_list = Column(Text)
    deliver_x = Column(Boolean, default=False)
    deliver_note = Column(Boolean, default=False)

    deliveries = relationship("Delivery", back_populates="draft")

class Delivery(Base):
    __tablename__ = "deliveries"
    id = Column(Integer, primary_key=True)
    draft_id = Column(Integer, ForeignKey("drafts.id"))
    channel = Column(String(10), nullable=False)  # email/x/note
    payload = Column(JSON)
    result = Column(JSON)
    created_at = Column(DateTime(timezone=True), server_default=func.now())

    draft = relationship("Draft", back_populates="deliveries")

def init_db():
    Base.metadata.create_all(bind=engine)