-- ============================================
-- 应付账款功能 - 创建应付账款表
-- ============================================

-- 应付账款表
CREATE TABLE public.accounts_payable (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  plan_id UUID NOT NULL REFERENCES public.production_plans(id) ON DELETE CASCADE,
  purchaser_id UUID NOT NULL REFERENCES public.companies(id) ON DELETE CASCADE,
  textile_factory_id UUID NOT NULL REFERENCES public.companies(id) ON DELETE CASCADE,
  -- 金额信息
  total_amount DECIMAL NOT NULL DEFAULT 0,
  paid_amount DECIMAL NOT NULL DEFAULT 0,
  unpaid_amount DECIMAL NOT NULL DEFAULT 0,
  -- 数量信息
  total_quantity DECIMAL NOT NULL DEFAULT 0,
  paid_quantity DECIMAL NOT NULL DEFAULT 0,
  unpaid_quantity DECIMAL NOT NULL DEFAULT 0,
  -- 单价（元/米）
  price_per_meter DECIMAL NOT NULL DEFAULT 0,
  -- 状态
  status TEXT NOT NULL DEFAULT 'unpaid',
  -- 时间
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

-- 应付账款明细表（记录每次入库产生的应付记录）
CREATE TABLE public.accounts_payable_items (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  accounts_payable_id UUID NOT NULL REFERENCES public.accounts_payable(id) ON DELETE CASCADE,
  inventory_record_id UUID REFERENCES public.inventory_records(id) ON DELETE SET NULL,
  -- 入库信息
  quantity DECIMAL NOT NULL DEFAULT 0,
  rolls INTEGER DEFAULT 0,
  price_per_meter DECIMAL NOT NULL DEFAULT 0,
  amount DECIMAL NOT NULL DEFAULT 0,
  -- 状态
  status TEXT NOT NULL DEFAULT 'unpaid',
  -- 关联的付款记录
  payment_id UUID REFERENCES public.payments(id) ON DELETE SET NULL,
  -- 时间
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  paid_at TIMESTAMPTZ
);

-- 添加索引
CREATE INDEX idx_accounts_payable_plan ON public.accounts_payable(plan_id);
CREATE INDEX idx_accounts_payable_purchaser ON public.accounts_payable(purchaser_id);
CREATE INDEX idx_accounts_payable_factory ON public.accounts_payable(textile_factory_id);
CREATE INDEX idx_accounts_payable_status ON public.accounts_payable(status);
CREATE INDEX idx_accounts_payable_items_ap ON public.accounts_payable_items(accounts_payable_id);
CREATE INDEX idx_accounts_payable_items_status ON public.accounts_payable_items(status);