/* store.js — shared data layer (localStorage). Load this first on both pages. */
(function (global) {
  'use strict';

  var PKEY = 'qgen.pricelist.v3';
  var QKEY = 'qgen.quote.v3';
  var TERMS = [1, 3, 5, 10];

  var DEFAULT_CODES = [
    'WAM B', 'WAM P', 'WAM C',
    'MWPB', 'MWPD', 'MWPU',
    'WHE', 'WHD', 'WHU', 'WHM',
    'WHPL', 'WHPE', 'WHPG', 'WHPEx'
  ];

  var money = new Intl.NumberFormat('en-US', {
    style: 'currency', currency: 'USD',
    minimumFractionDigits: 2, maximumFractionDigits: 2
  });

  function fmt(n) { return money.format(isFinite(n) ? n : 0); }

  function num(v) {
    var n = parseFloat(v);
    if (!isFinite(n) || n < 0) return 0;
    return Math.round(n * 100) / 100;
  }

  function blankDisc() {
    var d = {};
    TERMS.forEach(function (y) { d[y] = 0; });
    return d;
  }

  function blankProduct(code) {
    return { code: code, label: '', retail: 0, disc: blankDisc() };
  }

  function defaults() {
    return {
      seeded: true,
      settings: { discMode: 'total' }, // 'total' | 'peryear'
      products: DEFAULT_CODES.map(blankProduct)
    };
  }

  function normalizeProduct(p) {
    var out = blankProduct(String(p && p.code ? p.code : 'NEW').trim() || 'NEW');
    out.label = p && p.label ? String(p.label) : '';
    out.retail = num(p && p.retail);
    TERMS.forEach(function (y) {
      out.disc[y] = num(p && p.disc ? p.disc[y] : 0);
    });
    return out;
  }

  function normalize(raw) {
    var data = defaults();
    if (!raw || typeof raw !== 'object') return data;

    data.seeded = raw.seeded !== false;
    if (raw.settings && raw.settings.discMode === 'peryear') {
      data.settings.discMode = 'peryear';
    }

    if (Array.isArray(raw.products)) {
      var seen = {};
      data.products = raw.products.map(normalizeProduct).map(function (p) {
        var base = p.code, i = 2;
        while (seen[p.code.toLowerCase()]) { p.code = base + ' (' + i + ')'; i++; }
        seen[p.code.toLowerCase()] = true;
        return p;
      });

      // Re-add any factory codes only if this list was never seeded.
      if (!data.seeded) {
        DEFAULT_CODES.forEach(function (c) {
          if (!seen[c.toLowerCase()]) data.products.push(blankProduct(c));
        });
        data.seeded = true;
      }
    }
    return data;
  }

  function loadPrices() {
    try {
      var raw = localStorage.getItem(PKEY);
      if (!raw) return defaults();
      return normalize(JSON.parse(raw));
    } catch (e) {
      console.warn('Price list unreadable, using defaults.', e);
      return defaults();
    }
  }

  function savePrices(data) {
    try {
      localStorage.setItem(PKEY, JSON.stringify(normalize(data)));
      return true;