// pricing_config (dev-plan-4.md T23; schema: dressup-dance-room-mvcp.md
// M.12) — a JSON file, not SQLite: it's operator-edited config, not on the
// "spend + generate + refund" atomic path that's why credit_ledger (db.js)
// needed SQLite. Keyed by `key` (not an auto id), so this is deliberately
// its own tiny module rather than store.js's createStore.
const fs = require("fs");
const path = require("path");

const PRICING_PATH = process.env.PRICING_PATH || path.join(__dirname, "pricing.json");

// Real values are TBD (dev-plan-4.md §1.2 item 3) — these are placeholders
// so the spend/topup mechanism has something to read; change the numbers
// in pricing.json (or here, before first run) whenever real pricing lands.
const DEFAULTS = [
  { key: "spend_garment", kind: "spend", credits: 10, priceCents: null, segmentsPerUnit: null, isActive: true, updatedAt: Date.now() },
  { key: "topup_tier_1", kind: "topup_tier", credits: 100, priceCents: 999, segmentsPerUnit: null, isActive: true, updatedAt: Date.now() },
  { key: "topup_tier_2", kind: "topup_tier", credits: 550, priceCents: 4999, segmentsPerUnit: null, isActive: true, updatedAt: Date.now() },
];

function load(filePath) {
  try {
    return JSON.parse(fs.readFileSync(filePath, "utf8"));
  } catch {
    fs.writeFileSync(filePath, JSON.stringify(DEFAULTS, null, 2));
    return DEFAULTS.slice();
  }
}

function createPricingStore(filePath) {
  function save(items) {
    fs.writeFileSync(filePath, JSON.stringify(items, null, 2));
  }
  return {
    list() {
      return load(filePath);
    },
    get(key) {
      return load(filePath).find((p) => p.key === key) || null;
    },
    upsert(key, patch) {
      const items = load(filePath);
      const idx = items.findIndex((p) => p.key === key);
      const updated = idx === -1 ? { key, isActive: true, ...patch, updatedAt: Date.now() } : { ...items[idx], ...patch, key, updatedAt: Date.now() };
      if (idx === -1) items.push(updated);
      else items[idx] = updated;
      save(items);
      return updated;
    },
  };
}

module.exports = { createPricingStore, pricing: createPricingStore(PRICING_PATH) };