/**
 * pi-char-thai — Thai input fixes for pi's editor.
 *
 * Installs a CustomEditor subclass through the official setEditorComponent
 * API. Fails closed: headless sessions and any pi whose editor no longer
 * exposes the methods the overrides adapt keep the stock editor, with one
 * notification and never a throw.
 */

import type { ExtensionAPI } from '@earendil-works/pi-coding-agent'
import { makeThaiEditorClass, missingEditorMethods } from './editor'
import { chainEditorComponent } from './editor-chain'

export default function charThai(pi: ExtensionAPI) {
  pi.on('session_start', (_event, ctx) => {
    if (!ctx.hasUI) return // RPC/print modes never construct an editor
    try {
      const missing = missingEditorMethods()
      if (missing.length > 0) {
        ctx.ui.notify(
          `pi-char-thai: incompatible pi editor shape (missing ${missing.join(', ')}) — keeping the stock editor`,
          'warning',
        )
        return // leaves any editor factory another extension installed untouched
      }
      // Chain, don't replace: another editor-installing extension (e.g.
      // pi-slash-suggest) may load before or after us (editor-chain.ts).
      chainEditorComponent(ctx.ui, makeThaiEditorClass)
    } catch (err) {
      // Never take down pi startup over an editor swap.
      try {
        ctx.ui.notify(`pi-char-thai: editor install failed (${String(err)}) — keeping the stock editor`, 'error')
      } catch {}
    }
  })
}