/**
 * cli:scaffold-extension-config — generate.ts
 *
 * Emits an ExtensionConfig for a module, listing every slot that the scaffolded
 * components publish via `<Slot name="..." />`. Clients (or other extensions)
 * fill these slots with `<Fill slot="..." />`.
 *
 * ExtensionConfig type comes from `@atlashub/smartstack` (npm).
 *
 * The slot catalog is the SSOT `lib/slot-names.ts` — the exact `<Slot name="...">`
 * calls scaffold-component renders (drift-tested against the real renderer).
 * Until 2026-09-24 this file published `${module}.${entity}.list.before…` while
 * the pages rendered `${entity}.header.actions`… — zero names in common, every
 * <Fill> dead (audit B-CRIT-05). Slot names carry NO module prefix.
 */
import type { ScaffoldExtensionConfigInput, GeneratedFile } from './types.js'
import { DEFAULT_SLOT_VIEWS, SLOT_SUFFIXES_BY_VIEW, slotCatalogue } from '../../../../../lib/slot-names.js'
import { toCamelCase } from '../../../../../lib/string-utils.js'

const OPTIONAL_VIEWS = (Object.keys(SLOT_SUFFIXES_BY_VIEW) as Array<keyof typeof SLOT_SUFFIXES_BY_VIEW>).filter(
  (v) => !DEFAULT_SLOT_VIEWS.includes(v),
)

export function generate(spec: ScaffoldExtensionConfigInput): GeneratedFile[] {
  const allSlots = spec.entities.flatMap((e) => slotCatalogue(e))
  const jsDocLines = allSlots
    .map((s) => ` *   - '${s.name}' (${s.view} page): ${s.description}`)
    .join('\n')
  const optionalLines = OPTIONAL_VIEWS
    .map((v) => ` *   - ${v} page (when generated): ${SLOT_SUFFIXES_BY_VIEW[v].map((sfx) => `'{entity}.${sfx}'`).join(', ')}`)
    .join('\n')
  const slotEntries = allSlots.map((s) => `    '${s.name}': null,`).join('\n')
  // A hyphenated module (`time-entry`) is not a valid identifier (audit B-WARN-17).
  const configName = `${toCamelCase(spec.module)}Config`

  const content = `import type { ExtensionConfig } from '@atlashub/smartstack';

/**
 * Extension configuration for the ${spec.module} module.
 *
 * Slot catalog — the exact <Slot name="..."> calls the generated pages render
 * (SSOT: skills/lib/slot-names.ts, no module prefix):
${jsDocLines}
 *
 * Also rendered by the optional views:
${optionalLines}
 *
 * Add Fill components in your app entrypoint to inject content into any slot:
 *   <Fill slot="${allSlots[0]?.name ?? 'example'}">{yourJsx}</Fill>
 */
export const ${configName}: ExtensionConfig = {
  slots: {
${slotEntries}
  },
  tableColumns: {},
  formFields: {},
  hooks: {},
};
`

  return [{ path: `src/extensions/${spec.module}Extensions.ts`, content }]
}