"""phase29 — broadcasts table for admin push notifications to iOS

Adds the `broadcasts` table. Each row records an admin-composed message,
the roles it targeted, who sent it, and how many Notification rows were
created.  The Notification rows themselves are written at send-time using
the existing notify() utility — no schema changes to that table are needed.
"""

from alembic import op
import sqlalchemy as sa


revision      = 'phase29_broadcasts'
down_revision = 'phase28_fix_inspection_notify'
branch_labels = None
depends_on    = None


def upgrade():
    op.execute("""
        CREATE TABLE IF NOT EXISTS broadcasts (
            id               INT          NOT NULL AUTO_INCREMENT PRIMARY KEY,
            title            VARCHAR(255) NOT NULL,
            body             TEXT         NOT NULL,
            target_roles     JSON         NOT NULL,
            sent_by_id       INT          NULL,
            sent_at          DATETIME     NOT NULL DEFAULT CURRENT_TIMESTAMP,
            recipient_count  INT          NOT NULL DEFAULT 0,
            CONSTRAINT fk_broadcast_sender
                FOREIGN KEY (sent_by_id) REFERENCES users(id)
                ON DELETE SET NULL
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
    """)


def downgrade():
    op.execute("DROP TABLE IF EXISTS broadcasts")