import {z} from 'zod'

export type CAGSearchRequest = {query: string, top_k?: number | undefined, include_constitution?: boolean | undefined, min_pot_score?: number | undefined};

export type CreateApiPotsPotIdCagSearchArgs = {pot_id: string, body: CAGSearchRequest};

export type CreateApiPotsPotIdCagSearchOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

export const matchDetails = z.object({keyword_score: z.number().gte(0).lte(1), entity_score: z.number().gte(0).lte(1), matched_keywords: z.array(z.string()).optional(), matched_entities: z.array(z.string()).optional()});

export const cAGSearchResultItem = z.object({fact_id: z.string(), content: z.string(), score: z.number().gte(0).lte(1), pot_score: z.number().gte(0).lte(1), level: z.string(), domain: z.string().nullable().optional(), tags: z.array(z.string()).optional(), match_details: matchDetails});

export const cAGSearchData = z.object({results: z.array(cAGSearchResultItem).optional(), total_results: z.number().int().gte(0)});

export const searchConfidence = z.object({match_quality: z.number().gte(0).lte(1), top_score: z.number().gte(0).lte(1), results_count: z.number().int().gte(0), suggestion: z.enum(["sufficient", "consider_rag", "no_match"])});

export const cAGSearchMetadata = z.object({pot_id: z.string(), query: z.string(), retrieval_strategy: z.literal("CAG").optional(), latency_ms: z.number().int().gte(0), cache_status: z.enum(["hit", "miss", "initialized"])});

export const cAGSearchResponse = z.object({data: cAGSearchData, confidence: searchConfidence, metadata: cAGSearchMetadata});

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * CAG keyword/entity search
 * 
 * POST /pots/{pot_id}/cag/search
 */
export const createApiPotsPotIdCagSearch = async (args: CreateApiPotsPotIdCagSearchArgs, options: CreateApiPotsPotIdCagSearchOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('content-type', "application/json")
headers.set('accept', "application/json")

const url = `${baseUrl.replace(/\/+$/, '')}/pots/${encodeURIComponent(String(args.pot_id))}/cag/search${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(cAGSearchResponse, await res.json())
};