"""add knowledge documents and vector chunks

Revision ID: 20260712_0005
Revises: 20260712_0004
"""
from collections.abc import Sequence

from alembic import op
import sqlalchemy as sa
from pgvector.sqlalchemy import Vector

revision: str = "20260712_0005"
down_revision: str | Sequence[str] | None = "20260712_0004"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.execute("CREATE EXTENSION IF NOT EXISTS vector")
    op.create_table(
        "knowledge_documents",
        sa.Column("id", sa.String(40), primary_key=True),
        sa.Column("knowledge_base_id", sa.String(40), nullable=False),
        sa.Column("name", sa.String(255), nullable=False),
        sa.Column("source_type", sa.String(16), nullable=False),
        sa.Column("mime_type", sa.String(128), server_default="text/plain", nullable=False),
        sa.Column("storage_key", sa.String(1024), nullable=True),
        sa.Column("size_bytes", sa.Integer(), server_default="0", nullable=False),
        sa.Column("status", sa.String(16), server_default="processing", nullable=False),
        sa.Column("error_message", sa.String(2048), server_default="", nullable=False),
        sa.Column("chunk_count", sa.Integer(), server_default="0", nullable=False),
        sa.Column("created_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
        sa.Column("updated_at", sa.DateTime(timezone=True), server_default=sa.func.now(), nullable=False),
        sa.ForeignKeyConstraint(["knowledge_base_id"], ["knowledge_bases.id"], ondelete="CASCADE"),
    )
    op.create_index("ix_knowledge_documents_knowledge_base_id", "knowledge_documents", ["knowledge_base_id"])
    op.create_table(
        "knowledge_chunks",
        sa.Column("id", sa.String(40), primary_key=True),
        sa.Column("knowledge_base_id", sa.String(40), nullable=False),
        sa.Column("document_id", sa.String(40), nullable=False),
        sa.Column("chunk_index", sa.Integer(), nullable=False),
        sa.Column("content", sa.Text(), nullable=False),
        sa.Column("embedding", Vector(), nullable=False),
        sa.ForeignKeyConstraint(["knowledge_base_id"], ["knowledge_bases.id"], ondelete="CASCADE"),
        sa.ForeignKeyConstraint(["document_id"], ["knowledge_documents.id"], ondelete="CASCADE"),
        sa.UniqueConstraint("document_id", "chunk_index", name="uq_knowledge_chunk_position"),
    )
    op.create_index("ix_knowledge_chunks_knowledge_base_id", "knowledge_chunks", ["knowledge_base_id"])
    op.create_index("ix_knowledge_chunks_document_id", "knowledge_chunks", ["document_id"])


def downgrade() -> None:
    op.drop_table("knowledge_chunks")
    op.drop_table("knowledge_documents")