const STORAGE_KEY = 'pricingCalcDropshipFieldConfig.v1';

export const DROPSHIP_DEFAULT_FIELD_ORDER = [
  'imageUrl', 'specsText', 'cost', 'price',
  'installFee', 'shipping', 'marginRate', 'commission', 'promoRate', 'adFee',
  'seeding', 'afterSale', 'insurance', 'brandFee', 'targetMargin', 'profitAmount',
  'coupon', 'activityDiscount', 'pddPrice', 'pddFinalPrice',
];

export const DROPSHIP_FIELD_LABELS = {
  imageUrl: '图片',
  specsText: '规格组合',
  cost: '采购成本',
  price: '到手价',
  installFee: '安装费',
  shipping: '运费',
  marginRate: '毛利率',
  commission: '平台佣金',
  promoRate: '推广占比',
  adFee: '营销广告费',
  seeding: '种菜占比',
  afterSale: '售后费用',
  insurance: '保险费',
  brandFee: '品牌使用费',
  targetMargin: '营业利润率',
  profitAmount: '营业利润额',
  coupon: '优惠券金额',
  activityDiscount: '活动折扣',
  pddPrice: '拼单价',
  pddFinalPrice: '最终拼单价',
};

export const createDefaultDropshipFieldConfig = () => ({
  order: [...DROPSHIP_DEFAULT_FIELD_ORDER],
  hidden: [],
});

export const normalizeDropshipFieldConfig = (raw) => {
  if (!raw || !Array.isArray(raw.order)) return createDefaultDropshipFieldConfig();
  const order = [...new Set(raw.order.filter((key) => DROPSHIP_DEFAULT_FIELD_ORDER.includes(key)))];
  DROPSHIP_DEFAULT_FIELD_ORDER.forEach((key, defaultIndex) => {
    if (order.includes(key)) return;
    const previous = DROPSHIP_DEFAULT_FIELD_ORDER
      .slice(0, defaultIndex)
      .reverse()
      .find((candidate) => order.includes(candidate));
    if (previous) {
      order.splice(order.indexOf(previous) + 1, 0, key);
    } else {
      order.push(key);
    }
  });
  const hidden = (Array.isArray(raw.hidden) ? raw.hidden : [])
    .filter((key) => DROPSHIP_DEFAULT_FIELD_ORDER.includes(key));
  return { order, hidden };
};

export const loadDropshipFieldConfig = () => {
  try {
    return normalizeDropshipFieldConfig(JSON.parse(window.localStorage.getItem(STORAGE_KEY) || 'null'));
  } catch {
    return createDefaultDropshipFieldConfig();
  }
};

export const saveDropshipFieldConfig = (config) => {
  try {
    window.localStorage.setItem(STORAGE_KEY, JSON.stringify(config));
  } catch {
    // localStorage 不可用时仅保留当前会话状态。
  }
};