"""add subject_pds table

Revision ID: 20260228_01
Revises: 20260227_06
Create Date: 2026-02-28 10:30:00.000000

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa
from sqlalchemy.dialects import postgresql


# revision identifiers, used by Alembic.
revision: str = "20260228_01"
down_revision: Union[str, None] = "20260227_06"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    bind = op.get_bind()
    inspector = sa.inspect(bind)
    table_names = set(inspector.get_table_names())

    if "subject_pds" not in table_names:
        op.create_table(
            "subject_pds",
            sa.Column("id", postgresql.UUID(as_uuid=True), nullable=False),
            sa.Column("study_id", postgresql.UUID(as_uuid=True), nullable=False),
            sa.Column("subject_id", postgresql.UUID(as_uuid=True), nullable=False),
            sa.Column("pd_no", sa.String(length=64), nullable=False),
            sa.Column("pd_type", sa.String(length=100), nullable=False),
            sa.Column("pd_level", sa.String(length=20), nullable=False, server_default=sa.text("'GENERAL'")),
            sa.Column("approval_status", sa.String(length=20), nullable=False, server_default=sa.text("'DRAFT'")),
            sa.Column("description", sa.Text(), nullable=True),
            sa.Column("status", sa.String(length=20), nullable=False, server_default=sa.text("'OPEN'")),
            sa.Column("created_by", postgresql.UUID(as_uuid=True), nullable=True),
            sa.Column("created_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.text("now()")),
            sa.Column("updated_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.text("now()")),
            sa.ForeignKeyConstraint(["study_id"], ["studies.id"]),
            sa.ForeignKeyConstraint(["subject_id"], ["subjects.id"]),
            sa.ForeignKeyConstraint(["created_by"], ["users.id"]),
            sa.PrimaryKeyConstraint("id"),
            sa.UniqueConstraint("study_id", "pd_no", name="uq_subject_pds_study_pd_no"),
        )
        table_names.add("subject_pds")

    indexes = {idx["name"] for idx in inspector.get_indexes("subject_pds")} if "subject_pds" in table_names else set()
    study_index_name = op.f("ix_subject_pds_study_id")
    if study_index_name not in indexes:
        op.create_index(study_index_name, "subject_pds", ["study_id"], unique=False)

    subject_index_name = op.f("ix_subject_pds_subject_id")
    if subject_index_name not in indexes:
        op.create_index(subject_index_name, "subject_pds", ["subject_id"], unique=False)


def downgrade() -> None:
    bind = op.get_bind()
    inspector = sa.inspect(bind)
    table_names = set(inspector.get_table_names())

    if "subject_pds" in table_names:
        indexes = {idx["name"] for idx in inspector.get_indexes("subject_pds")}
        study_index_name = op.f("ix_subject_pds_study_id")
        if study_index_name in indexes:
            op.drop_index(study_index_name, table_name="subject_pds")

        subject_index_name = op.f("ix_subject_pds_subject_id")
        if subject_index_name in indexes:
            op.drop_index(subject_index_name, table_name="subject_pds")

        op.drop_table("subject_pds")