/**
 * Custom renderer adapter for Imhotep Playwright.
 *
 * Allows users to provide their own mount function for arbitrary
 * render targets. This is the escape hatch for frameworks not
 * explicitly supported by built-in adapters.
 */

import { Page } from 'playwright'
import type { SceneTarget } from 'imhotep-core/scene-target'
import { RendererAdapter } from './renderers.js'

export interface CustomAdapterOptions {
  /** Unique identifier for this adapter instance. */
  id?: string
  /** User-provided mount function. */
  mount: (page: Page, target: SceneTarget, input: unknown) => Promise<void>
  /** Optional user-provided unmount function. */
  unmount?: (page: Page) => Promise<void>
}

export function createCustomAdapter(options: CustomAdapterOptions): RendererAdapter {
  return {
    id: options.id ?? 'custom',

    async mount(page: Page, target: SceneTarget, input: unknown): Promise<void> {
      if (target.kind !== 'custom-renderer' && target.kind !== 'react-component' && target.kind !== 'vue-component') {
        throw new Error(
          `Custom adapter received unsupported target kind: ${target.kind}. ` +
          `Expected 'custom-renderer', 'react-component', or 'vue-component'. ` +
          `If you registered this adapter for a specific renderer, ensure the target matches.`
        )
      }
      await options.mount(page, target, input)
    },

    async unmount(page: Page): Promise<void> {
      if (options.unmount) {
        await options.unmount(page)
      }
    },
  }
}