"""SQLAlchemy models for the brain service."""

import uuid
from datetime import datetime

from pgvector.sqlalchemy import Vector
from sqlalchemy import (
    Column, String, Text, Integer, Float, DateTime, ForeignKey, Index, text
)
from sqlalchemy.dialects.postgresql import JSONB, UUID, ARRAY
from sqlalchemy.orm import relationship

from app.config import OPENAI_EMBED_DIM
from app.database import Base


def new_id():
    return str(uuid.uuid4())


class Item(Base):
    __tablename__ = "items"

    id = Column(UUID(as_uuid=False), primary_key=True, default=new_id)
    user_id = Column(String(64), nullable=False, index=True)
    type = Column(String(32), nullable=False, default="link")  # link|note|pdf|image|document|file
    title = Column(Text, nullable=True)
    url = Column(Text, nullable=True)
    raw_content = Column(Text, nullable=True)       # original user input (note body, etc.)
    extracted_text = Column(Text, nullable=True)     # full extracted text from page/doc
    folder = Column(String(64), nullable=True)
    tags = Column(ARRAY(String), nullable=True, default=list)
    summary = Column(Text, nullable=True)
    confidence = Column(Float, nullable=True)
    metadata_json = Column(JSONB, nullable=True, default=dict)
    processing_status = Column(String(32), nullable=False, default="pending")  # pending|processing|ready|failed
    processing_error = Column(Text, nullable=True)

    # Embedding (pgvector)
    embedding = Column(Vector(OPENAI_EMBED_DIM), nullable=True)

    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False)

    # Relationships
    assets = relationship("ItemAsset", back_populates="item", cascade="all, delete-orphan")

    __table_args__ = (
        Index("ix_items_user_status", "user_id", "processing_status"),
        Index("ix_items_user_folder", "user_id", "folder"),
        Index("ix_items_created", "created_at"),
    )


class ItemAsset(Base):
    __tablename__ = "item_assets"

    id = Column(UUID(as_uuid=False), primary_key=True, default=new_id)
    item_id = Column(UUID(as_uuid=False), ForeignKey("items.id", ondelete="CASCADE"), nullable=False, index=True)
    asset_type = Column(String(32), nullable=False)  # screenshot|archived_html|original_upload|extracted_file
    filename = Column(String(512), nullable=False)
    content_type = Column(String(128), nullable=True)
    size_bytes = Column(Integer, nullable=True)
    storage_path = Column(String(1024), nullable=False)  # relative path in storage

    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)

    # Relationships
    item = relationship("Item", back_populates="assets")


class AppLink(Base):
    """Placeholder for future cross-app linking (e.g. link a saved item to a trip or task)."""
    __tablename__ = "app_links"

    id = Column(UUID(as_uuid=False), primary_key=True, default=new_id)
    item_id = Column(UUID(as_uuid=False), ForeignKey("items.id", ondelete="CASCADE"), nullable=False, index=True)
    app = Column(String(64), nullable=False)       # trips|tasks|fitness|inventory
    app_entity_id = Column(String(128), nullable=False)
    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)