/**
 * `@deepseek-ai/dsh-web-search-exa`: registers an Exa-backed `WebSearchProvider`
 * with `ctx.web`. A function/namespace plugin (NOT a default-export service):
 * a search provider does not own the `ctx.web` key — it registers INTO the
 * seam's provider registry, exactly as `@deepseek-ai/dsh-llm-deepseek`
 * registers an adapter into `ctx.llm`. The key is owned by `@deepseek-ai/dsh-web`.
 *
 * @module @deepseek-ai/dsh-web-search-exa
 */

import type { Context } from 'cordis'
import z from 'schemastery'
import type {} from '@deepseek-ai/dsh-web'
import {
  ExaSearchProvider,
  EXA_DEFAULT_BASE_URL,
  EXA_DEFAULT_HIGHLIGHTS_PER_RESULT,
  EXA_DEFAULT_SEARCH_TYPE,
} from './provider.ts'

export {
  EXA_DEFAULT_BASE_URL,
  EXA_DEFAULT_HIGHLIGHTS_PER_RESULT,
  EXA_DEFAULT_SEARCH_TYPE,
  EXA_PROVIDER_ID,
  ExaSearchProvider,
} from './provider.ts'
export type { ExaSearchProviderOptions } from './provider.ts'

/** Cordis plugin name used by loader diagnostics. */
export const name = 'web-search-exa'

/** The web seam this provider registers into. */
export const inject = ['web']

/** Plugin config (all optional — `apply` fills env-var and constant defaults). */
export interface Config {
  /** Exa API key. Falls back to `$EXA_API_KEY`. Empty → provider unavailable. */
  apiKey?: string
  /** Endpoint base; `/search` is appended. Defaults to the public API. */
  baseURL?: string
  /** Retrieval mode sent as Exa's `type`. Defaults to `auto`. */
  searchType?: 'auto' | 'keyword' | 'neural'
  /** Default result count when a request carries no `maxResults`. Omitted = none. */
  numResults?: number
  /** Highlight sentences requested per result. Defaults to 1. */
  highlightsPerResult?: number
}

export const Config: z<Config> = z.object({
  apiKey: z.string(),
  baseURL: z.string(),
  searchType: z.union(['auto', 'keyword', 'neural'] as const),
  numResults: z.number().step(1).min(1),
  highlightsPerResult: z.number().step(1).min(1),
})

/** Register the Exa search provider with `ctx.web`. */
export function apply(ctx: Context, config: Config): void {
  ctx.web.registerSearchProvider(new ExaSearchProvider({
    apiKey: config.apiKey ?? process.env.EXA_API_KEY ?? '',
    baseURL: config.baseURL ?? EXA_DEFAULT_BASE_URL,
    searchType: config.searchType ?? EXA_DEFAULT_SEARCH_TYPE,
    highlightsPerResult: config.highlightsPerResult ?? EXA_DEFAULT_HIGHLIGHTS_PER_RESULT,
    ...config.numResults !== undefined ? { numResults: config.numResults } : {},
  }))
}