"""add project_task_assignments table

Revision ID: 059
Revises: 058
Create Date: 2025-01-01 00:00:00.000000

"""
from alembic import op
import sqlalchemy as sa

# revision identifiers, used by Alembic.
revision = "059"
down_revision = "058"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.create_table(
        "project_task_assignments",
        sa.Column("id", sa.Integer(), primary_key=True, autoincrement=True),
        sa.Column("task_id", sa.Integer(), sa.ForeignKey("project_tasks.id", ondelete="CASCADE"), nullable=False),
        sa.Column("user_id", sa.Integer(), sa.ForeignKey("users.id", ondelete="CASCADE"), nullable=False),
        sa.Column("assigned_by", sa.Integer(), sa.ForeignKey("users.id", ondelete="CASCADE"), nullable=False),
        sa.Column("created_at", sa.DateTime(), server_default=sa.func.now()),
        sa.UniqueConstraint("task_id", "user_id", name="uq_task_assignments_task_user"),
    )
    op.create_index("ix_task_assignments_task_id", "project_task_assignments", ["task_id"])
    op.create_index("ix_task_assignments_user_id", "project_task_assignments", ["user_id"])


def downgrade() -> None:
    op.drop_index("ix_task_assignments_user_id", table_name="project_task_assignments")
    op.drop_index("ix_task_assignments_task_id", table_name="project_task_assignments")
    op.drop_table("project_task_assignments")