-- Shipping cost groups (هزینه ارسال) + per-city overrides + category assignment

CREATE TABLE IF NOT EXISTS shipping_cost_groups (
  id BIGSERIAL PRIMARY KEY,
  business_id BIGINT NOT NULL REFERENCES businesses (id) ON DELETE CASCADE ON UPDATE NO ACTION,
  name VARCHAR(255) NOT NULL,
  name_en VARCHAR(255) NOT NULL,
  description TEXT NULL,
  methods TEXT[] NOT NULL DEFAULT '{}',
  default_amount NUMERIC(12, 2) NOT NULL DEFAULT 0,
  sort_order INT NOT NULL DEFAULT 0,
  is_active BOOLEAN NOT NULL DEFAULT TRUE,
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_shipping_cost_groups_business_id
  ON shipping_cost_groups (business_id);

CREATE INDEX IF NOT EXISTS idx_shipping_cost_groups_business_sort_order
  ON shipping_cost_groups (business_id, sort_order);

DROP TRIGGER IF EXISTS shipping_cost_groups_set_updated_at ON shipping_cost_groups;
CREATE TRIGGER shipping_cost_groups_set_updated_at
  BEFORE UPDATE ON shipping_cost_groups
  FOR EACH ROW
  EXECUTE FUNCTION set_updated_at();

CREATE TABLE IF NOT EXISTS shipping_cost_group_city_rates (
  id BIGSERIAL PRIMARY KEY,
  shipping_cost_group_id BIGINT NOT NULL REFERENCES shipping_cost_groups (id) ON DELETE CASCADE ON UPDATE NO ACTION,
  city_id BIGINT NOT NULL REFERENCES cities (id) ON DELETE CASCADE ON UPDATE NO ACTION,
  amount NUMERIC(12, 2) NOT NULL,
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  CONSTRAINT shipping_cost_group_city_rates_unique UNIQUE (shipping_cost_group_id, city_id)
);

CREATE INDEX IF NOT EXISTS idx_shipping_cost_group_city_rates_group_id
  ON shipping_cost_group_city_rates (shipping_cost_group_id);

CREATE INDEX IF NOT EXISTS idx_shipping_cost_group_city_rates_city_id
  ON shipping_cost_group_city_rates (city_id);

DROP TRIGGER IF EXISTS shipping_cost_group_city_rates_set_updated_at ON shipping_cost_group_city_rates;
CREATE TRIGGER shipping_cost_group_city_rates_set_updated_at
  BEFORE UPDATE ON shipping_cost_group_city_rates
  FOR EACH ROW
  EXECUTE FUNCTION set_updated_at();

CREATE TABLE IF NOT EXISTS shipping_cost_group_categories (
  shipping_cost_group_id BIGINT NOT NULL REFERENCES shipping_cost_groups (id) ON DELETE CASCADE ON UPDATE NO ACTION,
  category_id BIGINT NOT NULL REFERENCES categories (id) ON DELETE CASCADE ON UPDATE NO ACTION,
  PRIMARY KEY (shipping_cost_group_id, category_id)
);

CREATE INDEX IF NOT EXISTS idx_shipping_cost_group_categories_category_id
  ON shipping_cost_group_categories (category_id);