// models/advertisements/advertisements.placements.js
//
// Declarative registry of every ad placement in the client app. Each entry
// is a self-contained "slot" — a page + position pair — that determines the
// visual format (hero/banner/popup/sidebar) automatically. Adding a new
// placement should only ever require adding one entry here (and wiring the
// corresponding client page to fetch/render it) — nothing else in this file
// should need to change.
//
// `key` is what's stored on advertisements.placement. `format` is what gets
// denormalized onto advertisements.type on write (see applyAdvertisementFields
// in controllers/admin/advertisements.controller.js) — type is never accepted
// from the client once a placement is set.

const PLACEMENTS = [
  { key: "dashboard.hero",         format: "hero",    page: "dashboard",      pageLabel: "Dashboard",      slotLabel: "Hero (top of page)" },
  { key: "tier_plans.banner",      format: "banner",  page: "tier_plans",     pageLabel: "Tier Plans",     slotLabel: "Banner (above plan cards)" },
  { key: "course_details.banner",  format: "banner",  page: "course_details", pageLabel: "Course Details", slotLabel: "Banner (below hero)" },
];

const PLACEMENT_MAP  = Object.fromEntries(PLACEMENTS.map((p) => [p.key, p]));
const PLACEMENT_KEYS = PLACEMENTS.map((p) => p.key);

function getFormatForPlacement(key) {
  return PLACEMENT_MAP[key]?.format ?? null;
}

module.exports = { PLACEMENTS, PLACEMENT_MAP, PLACEMENT_KEYS, getFormatForPlacement };