"""
Infrastructure - Database Models (SQLAlchemy)
"""
import uuid
from datetime import datetime

from sqlalchemy import Column, DateTime, Integer, String, Text, BigInteger, Index
from sqlalchemy.dialects.postgresql import JSONB, UUID
from sqlalchemy.ext.declarative import declarative_base

Base = declarative_base()


class DocumentModel(Base):
    """Document table model"""

    __tablename__ = "documents"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    title = Column(String(500), nullable=False, index=True)
    filename = Column(String(255), nullable=False)
    file_type = Column(String(50), nullable=False, index=True)
    file_size = Column(BigInteger, nullable=False)
    storage_path = Column(String(1000), nullable=False)
    department = Column(String(100), nullable=False, index=True)
    status = Column(String(50), nullable=False, default="pending", index=True)
    upload_session_id = Column(String(100), nullable=True)
    uploaded_at = Column(DateTime(timezone=True), default=datetime.utcnow, nullable=False)
    indexed_at = Column(DateTime(timezone=True), nullable=True)
    doc_metadata = Column(JSONB, default={}, nullable=False)
    created_at = Column(DateTime(timezone=True), default=datetime.utcnow, nullable=False)
    updated_at = Column(
        DateTime(timezone=True), default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False
    )

    __table_args__ = (
        Index("ix_documents_department_status", "department", "status"),
        Index("ix_documents_created_at", "created_at"),
    )


class DocumentChunkModel(Base):
    """Document chunk table model"""

    __tablename__ = "document_chunks"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    document_id = Column(UUID(as_uuid=True), nullable=False, index=True)
    chunk_index = Column(Integer, nullable=False)
    content = Column(Text, nullable=False)
    token_count = Column(Integer, nullable=False)
    vector_id = Column(String(100), nullable=True, index=True)
    chunk_metadata = Column(JSONB, default={}, nullable=False)
    created_at = Column(DateTime(timezone=True), default=datetime.utcnow, nullable=False)

    __table_args__ = (Index("ix_chunks_document_id_index", "document_id", "chunk_index"),)


class QueryModel(Base):
    """Query table model"""

    __tablename__ = "queries"

    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    query_text = Column(Text, nullable=False)
    department = Column(String(100), nullable=False, index=True)
    user_id = Column(String(100), nullable=True, index=True)
    session_id = Column(String(100), nullable=True, index=True)
    status = Column(String(50), nullable=False, default="pending", index=True)
    answer = Column(Text, nullable=True)
    sources = Column(JSONB, default=[], nullable=False)
    confidence = Column(Integer, default=0, nullable=False)  # Store as int (0-100)
    duration_ms = Column(Integer, default=0, nullable=False)
    tokens_used = Column(Integer, default=0, nullable=False)
    model = Column(String(100), nullable=True)
    created_at = Column(DateTime(timezone=True), default=datetime.utcnow, nullable=False, index=True)
    completed_at = Column(DateTime(timezone=True), nullable=True)

    __table_args__ = (
        Index("ix_queries_department_created", "department", "created_at"),
        Index("ix_queries_user_created", "user_id", "created_at"),
    )