// lib/cssCache.js
// Per-tenant compiled-CSS cache + cache-busting (ARCHITECTURE.md 7.7)
const db = require("@saltcorn/data/db");
const { compileTheme } = require("./compile");
const themeStore = require("./themeStore");

const cache = new Map(); // tenantSchema -> Map<`${themeId}:${role??"_"}`, CompiledEntry>
function tkey() { return db.getTenantSchema(); }
function ck(themeId, role) { return `${themeId}:${role ?? "_"}`; }
function getCached(themeId, role) { return cache.get(tkey())?.get(ck(themeId, role)); }
function setCached(e) { let t = cache.get(tkey()); if (!t) cache.set(tkey(), (t = new Map())); t.set(ck(e.themeId, e.role), e); }
function bustTheme(themeId) { const t = cache.get(tkey()); if (t) for (const k of [...t.keys()]) if (k.startsWith(themeId + ":")) t.delete(k); }
function bustAll() { cache.delete(tkey()); }
async function warm(themeId, role) {                 // used by onLoad rehydration + activate
  const theme = await themeStore.getById(themeId);   // resolves rows AND builtins (SEAM FIX)
  if (!theme) return null;
  const compiled = compileTheme(theme.tokens, { engine: theme.engine });
  const entry = { ...compiled, themeId, role: role ?? null, builtAt: Date.now() };
  setCached(entry);
  return entry;
}

module.exports = { getCached, setCached, bustTheme, bustAll, warm };