"""Add domain_goals and repo_goals; add repo_goal_id FK to workstreams

Revision ID: c5d6e7f8a9b0
Revises: b4c5d6e7f8a9
Create Date: 2026-03-08 00:00:00.000000
"""
from typing import Sequence, Union

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

revision: str = "c5d6e7f8a9b0"
down_revision: Union[str, None] = "b4c5d6e7f8a9"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        "domain_goals",
        sa.Column("id", postgresql.UUID(as_uuid=True), nullable=False),
        sa.Column("domain_id", postgresql.UUID(as_uuid=True), nullable=False),
        sa.Column("title", sa.String(500), nullable=False),
        sa.Column("description", sa.Text(), nullable=False),
        sa.Column("status", sa.String(20), nullable=False, server_default="active"),
        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(), onupdate=sa.func.now(), nullable=False),
        sa.ForeignKeyConstraint(["domain_id"], ["domains.id"], ondelete="RESTRICT"),
        sa.PrimaryKeyConstraint("id"),
    )
    op.create_index("ix_domain_goals_domain_id", "domain_goals", ["domain_id"])
    op.create_index("ix_domain_goals_status", "domain_goals", ["status"])
    # Partial unique index: only one active goal per domain at a time
    op.execute(
        "CREATE UNIQUE INDEX ix_domain_goals_one_active "
        "ON domain_goals (domain_id) WHERE status = 'active'"
    )

    op.create_table(
        "repo_goals",
        sa.Column("id", postgresql.UUID(as_uuid=True), nullable=False),
        sa.Column("repo_id", postgresql.UUID(as_uuid=True), nullable=False),
        sa.Column("domain_goal_id", postgresql.UUID(as_uuid=True), nullable=True),
        sa.Column("title", sa.String(500), nullable=False),
        sa.Column("description", sa.Text(), nullable=False),
        sa.Column("priority", sa.Integer(), nullable=False, server_default="100"),
        sa.Column("status", sa.String(20), nullable=False, server_default="active"),
        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(), onupdate=sa.func.now(), nullable=False),
        sa.ForeignKeyConstraint(["repo_id"], ["managed_repos.id"], ondelete="RESTRICT"),
        sa.ForeignKeyConstraint(["domain_goal_id"], ["domain_goals.id"], ondelete="SET NULL"),
        sa.PrimaryKeyConstraint("id"),
    )
    op.create_index("ix_repo_goals_repo_id", "repo_goals", ["repo_id"])
    op.create_index("ix_repo_goals_domain_goal_id", "repo_goals", ["domain_goal_id"])
    op.create_index("ix_repo_goals_status", "repo_goals", ["status"])
    op.create_index("ix_repo_goals_priority", "repo_goals", ["priority"])

    op.add_column(
        "workstreams",
        sa.Column(
            "repo_goal_id",
            postgresql.UUID(as_uuid=True),
            sa.ForeignKey("repo_goals.id", ondelete="SET NULL"),
            nullable=True,
        ),
    )
    op.create_index("ix_workstreams_repo_goal_id", "workstreams", ["repo_goal_id"])


def downgrade() -> None:
    op.drop_index("ix_workstreams_repo_goal_id", table_name="workstreams")
    op.drop_column("workstreams", "repo_goal_id")

    op.drop_index("ix_repo_goals_priority", table_name="repo_goals")
    op.drop_index("ix_repo_goals_status", table_name="repo_goals")
    op.drop_index("ix_repo_goals_domain_goal_id", table_name="repo_goals")
    op.drop_index("ix_repo_goals_repo_id", table_name="repo_goals")
    op.drop_table("repo_goals")

    op.execute("DROP INDEX IF EXISTS ix_domain_goals_one_active")
    op.drop_index("ix_domain_goals_status", table_name="domain_goals")
    op.drop_index("ix_domain_goals_domain_id", table_name="domain_goals")
    op.drop_table("domain_goals")