/**
 * `@deepseek-ai/dsh-web-search-perplexity`: registers a Perplexity-backed
 * `WebSearchProvider` with `ctx.web`. A function/namespace plugin (NOT a
 * default-export service): it registers INTO the seam's provider registry, like
 * `@deepseek-ai/dsh-llm-deepseek` registers an adapter into `ctx.llm`.
 *
 * @module @deepseek-ai/dsh-web-search-perplexity
 */

import type { Context } from 'cordis'
import z from 'schemastery'
import type {} from '@deepseek-ai/dsh-web'
import { PerplexitySearchProvider, PERPLEXITY_DEFAULT_BASE_URL, PERPLEXITY_DEFAULT_MAX_TOKENS, PERPLEXITY_DEFAULT_MODEL } from './provider.ts'

export {
  PERPLEXITY_DEFAULT_BASE_URL,
  PERPLEXITY_DEFAULT_MAX_TOKENS,
  PERPLEXITY_DEFAULT_MODEL,
  PERPLEXITY_PROVIDER_ID,
  PerplexitySearchProvider,
} from './provider.ts'
export type { PerplexityRecency, PerplexitySearchProviderOptions } from './provider.ts'

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

/** 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 {
  /** Perplexity API key. Falls back to `$PERPLEXITY_API_KEY`. Empty → unavailable. */
  apiKey?: string
  /** Endpoint base; `/chat/completions` is appended. Defaults to the public API. */
  baseURL?: string
  /** Search model name. Defaults to `sonar`. */
  model?: string
  /** Upper bound on generated answer tokens. Defaults to 1024. */
  maxTokens?: number
  /** Recency window sent as `search_recency_filter`. Omitted = no filter. */
  searchRecency?: 'day' | 'week' | 'month' | 'year'
}

export const Config: z<Config> = z.object({
  apiKey: z.string(),
  baseURL: z.string(),
  model: z.string(),
  maxTokens: z.number().step(1).min(1),
  searchRecency: z.union(['day', 'week', 'month', 'year'] as const),
})

/** Register the Perplexity search provider with `ctx.web`. */
export function apply(ctx: Context, config: Config): void {
  ctx.web.registerSearchProvider(new PerplexitySearchProvider({
    apiKey: config.apiKey ?? process.env.PERPLEXITY_API_KEY ?? '',
    baseURL: config.baseURL ?? PERPLEXITY_DEFAULT_BASE_URL,
    model: config.model ?? PERPLEXITY_DEFAULT_MODEL,
    maxTokens: config.maxTokens ?? PERPLEXITY_DEFAULT_MAX_TOKENS,
    ...config.searchRecency !== undefined ? { searchRecency: config.searchRecency } : {},
  }))
}