CREATE TABLE IF NOT EXISTS service_departments (
    id uuid PRIMARY KEY,
    name text NOT NULL,
    code text NOT NULL UNIQUE,
    phone text,
    parent_id uuid REFERENCES service_departments(id) ON DELETE SET NULL,
    region_id uuid REFERENCES regions(id) ON DELETE SET NULL,
    description text,
    created_at timestamptz NOT NULL DEFAULT now(),
    updated_at timestamptz NOT NULL DEFAULT now()
);

CREATE UNIQUE INDEX IF NOT EXISTS service_departments_name_idx
    ON service_departments (name);

ALTER TABLE IF EXISTS service_departments
    ADD COLUMN IF NOT EXISTS parent_id uuid REFERENCES service_departments(id) ON DELETE SET NULL;

ALTER TABLE IF EXISTS service_departments
    ADD COLUMN IF NOT EXISTS phone text;

CREATE INDEX IF NOT EXISTS service_departments_parent_idx
    ON service_departments (parent_id);

CREATE TABLE IF NOT EXISTS service_department_permits (
    department_id uuid NOT NULL REFERENCES service_departments(id) ON DELETE CASCADE,
    region_id uuid NOT NULL REFERENCES regions(id) ON DELETE CASCADE,
    permit_id uuid NOT NULL REFERENCES permits(id) ON DELETE CASCADE,
    created_at timestamptz NOT NULL DEFAULT now(),
    created_by text,
    PRIMARY KEY (department_id, region_id, permit_id)
);

CREATE INDEX IF NOT EXISTS service_dept_permits_region_idx
    ON service_department_permits (region_id, permit_id);

ALTER TABLE IF EXISTS auth_users
    ADD COLUMN IF NOT EXISTS service_department_id uuid REFERENCES service_departments(id);

ALTER TABLE IF EXISTS auth_users
    ADD COLUMN IF NOT EXISTS department_role text;

CREATE INDEX IF NOT EXISTS auth_users_service_department_idx
    ON auth_users (service_department_id);