-- Supplier Purchase Orders
CREATE TABLE IF NOT EXISTS supplier_pos (
  id SERIAL PRIMARY KEY,
  po_number VARCHAR(30) NOT NULL UNIQUE,
  supplier_id INTEGER NOT NULL REFERENCES suppliers(id) ON DELETE CASCADE,
  planning_id INTEGER REFERENCES planning_history(id) ON DELETE SET NULL,
  order_date DATE NOT NULL DEFAULT CURRENT_DATE,
  status VARCHAR(20) NOT NULL DEFAULT 'draft',
  notes TEXT,
  total_value NUMERIC(12,2) NOT NULL DEFAULT 0,
  created_at TIMESTAMP NOT NULL DEFAULT NOW()
);

-- Supplier Purchase Order line items
CREATE TABLE IF NOT EXISTS supplier_po_items (
  id SERIAL PRIMARY KEY,
  supplier_po_id INTEGER NOT NULL REFERENCES supplier_pos(id) ON DELETE CASCADE,
  component_id INTEGER REFERENCES components(id) ON DELETE SET NULL,
  part_number VARCHAR(100),
  component_name VARCHAR(255),
  supplier_part_number VARCHAR(100),
  quantity INTEGER NOT NULL DEFAULT 0,
  unit_price NUMERIC(12,4) NOT NULL DEFAULT 0,
  line_total NUMERIC(12,2) NOT NULL DEFAULT 0,
  created_at TIMESTAMP NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_supplier_pos_supplier ON supplier_pos(supplier_id);
CREATE INDEX IF NOT EXISTS idx_supplier_pos_planning ON supplier_pos(planning_id);
CREATE INDEX IF NOT EXISTS idx_supplier_po_items_po ON supplier_po_items(supplier_po_id);