"""add workspace memberships

Revision ID: 20260428_add_workspace_memberships
Revises: 20260427_add_human_capacity_overrides
Create Date: 2026-04-28
"""

from __future__ import annotations

from alembic import op
import sqlalchemy as sa

try:
    from sqlalchemy.dialects.postgresql import JSONB
except Exception:  # pragma: no cover
    JSONB = sa.JSON


revision = "20260428_add_workspace_memberships"
down_revision = "20260427_add_human_capacity_overrides"
branch_labels = None
depends_on = None


def _json_type(bind):
    return JSONB() if bind.dialect.name == "postgresql" else sa.JSON()


def _table_exists(bind, table_name: str) -> bool:
    return sa.inspect(bind).has_table(table_name)


def _column_exists(bind, table_name: str, column_name: str) -> bool:
    if not _table_exists(bind, table_name):
        return False
    return any(column["name"] == column_name for column in sa.inspect(bind).get_columns(table_name))


def _index_exists(bind, table_name: str, index_name: str) -> bool:
    if not _table_exists(bind, table_name):
        return False
    return any(index["name"] == index_name for index in sa.inspect(bind).get_indexes(table_name))


def upgrade() -> None:
    bind = op.get_bind()
    json_type = _json_type(bind)

    if _table_exists(bind, "tenants"):
        if not _column_exists(bind, "tenants", "workspace_type"):
            op.add_column("tenants", sa.Column("workspace_type", sa.String(length=32), nullable=False, server_default="team"))
        if not _column_exists(bind, "tenants", "slug"):
            op.add_column("tenants", sa.Column("slug", sa.String(length=120), nullable=True))
        if not _column_exists(bind, "tenants", "owner_user_id"):
            op.add_column("tenants", sa.Column("owner_user_id", sa.BigInteger(), nullable=True))
        if not _column_exists(bind, "tenants", "status"):
            op.add_column("tenants", sa.Column("status", sa.String(length=32), nullable=False, server_default="active"))

    if not _table_exists(bind, "tenant_memberships"):
        op.create_table(
            "tenant_memberships",
            sa.Column("id", sa.Integer(), primary_key=True, autoincrement=True),
            sa.Column("tenant_id", sa.BigInteger(), nullable=False, index=True),
            sa.Column("created_at", sa.TIMESTAMP(), server_default=sa.func.now(), nullable=False),
            sa.Column("updated_at", sa.TIMESTAMP(), server_default=sa.func.now(), nullable=False),
            sa.Column("user_id", sa.BigInteger(), sa.ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True),
            sa.Column("role", sa.String(length=50), nullable=False),
            sa.Column("status", sa.String(length=32), nullable=False, server_default="active"),
            sa.Column("is_personal_owner", sa.Boolean(), nullable=False, server_default=sa.false()),
            sa.UniqueConstraint("tenant_id", "user_id", name="uq_tenant_memberships_tenant_user"),
        )
        op.create_index("ix_tenant_memberships_tenant_status", "tenant_memberships", ["tenant_id", "status"], unique=False)

    if not _table_exists(bind, "tenant_invitations"):
        op.create_table(
            "tenant_invitations",
            sa.Column("id", sa.Integer(), primary_key=True, autoincrement=True),
            sa.Column("tenant_id", sa.BigInteger(), nullable=False, index=True),
            sa.Column("created_at", sa.TIMESTAMP(), server_default=sa.func.now(), nullable=False),
            sa.Column("updated_at", sa.TIMESTAMP(), server_default=sa.func.now(), nullable=False),
            sa.Column("email", sa.String(length=255), nullable=False, index=True),
            sa.Column("role", sa.String(length=50), nullable=False),
            sa.Column("project_ids", json_type, nullable=False),
            sa.Column("token_hash", sa.String(length=128), nullable=False, unique=True, index=True),
            sa.Column("status", sa.String(length=32), nullable=False, server_default="pending"),
            sa.Column("expires_at", sa.TIMESTAMP(), nullable=False),
            sa.Column("invited_by_user_id", sa.BigInteger(), sa.ForeignKey("users.id"), nullable=False),
            sa.Column("accepted_by_user_id", sa.BigInteger(), sa.ForeignKey("users.id"), nullable=True),
        )
        op.create_index("ix_tenant_invitations_tenant_status", "tenant_invitations", ["tenant_id", "status"], unique=False)

    # Backfill current single-workspace users into membership rows.
    if _table_exists(bind, "users") and _table_exists(bind, "tenant_memberships"):
        if bind.dialect.name == "postgresql":
            op.execute(
                """
                INSERT INTO tenant_memberships (tenant_id, user_id, role, status, is_personal_owner, created_at, updated_at)
                SELECT users.tenant_id, users.id, users.role, 'active', false, NOW(), NOW()
                FROM users
                WHERE users.tenant_id IS NOT NULL
                ON CONFLICT ON CONSTRAINT uq_tenant_memberships_tenant_user DO NOTHING
                """
            )
        else:
            op.execute(
                """
                INSERT OR IGNORE INTO tenant_memberships (tenant_id, user_id, role, status, is_personal_owner, created_at, updated_at)
                SELECT users.tenant_id, users.id, users.role, 'active', 0, CURRENT_TIMESTAMP, CURRENT_TIMESTAMP
                FROM users
                WHERE users.tenant_id IS NOT NULL
                """
            )


def downgrade() -> None:
    bind = op.get_bind()
    if _table_exists(bind, "tenant_invitations"):
        if _index_exists(bind, "tenant_invitations", "ix_tenant_invitations_tenant_status"):
            op.drop_index("ix_tenant_invitations_tenant_status", table_name="tenant_invitations")
        op.drop_table("tenant_invitations")
    if _table_exists(bind, "tenant_memberships"):
        if _index_exists(bind, "tenant_memberships", "ix_tenant_memberships_tenant_status"):
            op.drop_index("ix_tenant_memberships_tenant_status", table_name="tenant_memberships")
        op.drop_table("tenant_memberships")
    if _table_exists(bind, "tenants"):
        for column_name in ("status", "owner_user_id", "slug", "workspace_type"):
            if _column_exists(bind, "tenants", column_name):
                op.drop_column("tenants", column_name)