// Load era templates for the "Create scenario" path from disk (v0.31.0, #52).
// Mirrors the preset store (server/presets.ts): each template is a JSON file
// (presets/templates/<id>.json) and index.json is the lightweight manifest used
// to render the picker cards. The store is created with the resolved templates
// directory so it works from repo root (dev) and /app (Docker) alike.
import { readFileSync } from 'node:fs';
import type { EraTemplate, TemplateMeta } from '../shared/scenario';

export interface TemplateStore {
  listMeta(): TemplateMeta[];
  get(id: string): EraTemplate | null;
}

export function createTemplateStore(dir: string): TemplateStore {
  const manifest = JSON.parse(readFileSync(`${dir}/index.json`, 'utf8')) as TemplateMeta[];
  return {
    listMeta() {
      return manifest;
    },
    get(id: string) {
      try {
        return JSON.parse(readFileSync(`${dir}/${id}.json`, 'utf8')) as EraTemplate;
      } catch {
        return null;
      }
    },
  };
}