import {z} from 'zod'

export type Meta = {limit?: number | undefined, page?: number | undefined};

export type VectorSearchRequestSchema = {query: string, db_id?: (string | null) | undefined, knowledge_id?: (string | null) | undefined, vector_db_ids?: (Array<string> | null) | undefined, search_type?: (string | null) | undefined, max_results?: (number | null) | undefined, filters?: ({[key: string]: unknown} | null) | undefined, meta?: (Meta | null) | undefined};

export type CreateApiKnowledgeSearchArgs = {body: VectorSearchRequestSchema};

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

export const vectorSearchResult = z.object({id: z.string(), content: z.string(), name: z.string().nullable().optional(), meta_data: z.record(z.string(), z.unknown()).nullable().optional(), usage: z.record(z.string(), z.unknown()).nullable().optional(), reranking_score: z.number().gte(0).lte(1).nullable().optional(), content_id: z.string().nullable().optional(), content_origin: z.string().nullable().optional(), size: z.number().int().gte(0).nullable().optional()});

export const paginationInfo = z.object({page: z.number().int().gte(0).optional(), limit: z.number().int().gte(1).optional(), total_pages: z.number().int().gte(0).optional(), total_count: z.number().int().gte(0).optional(), search_time_ms: z.number().gte(0).optional()});

export const paginatedResponseVectorSearchResult = z.object({data: z.array(vectorSearchResult), meta: paginationInfo});

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
};

/**
 * Search Knowledge
 * 
 * POST /knowledge/search
 */
export const createApiKnowledgeSearch = async (args: CreateApiKnowledgeSearchArgs, options: CreateApiKnowledgeSearchOptions) => {
const {baseUrl, fetch: fetchFn = fetch, HTTPBearer} = options ?? {}

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

if (HTTPBearer !== undefined) headers.set('authorization', `Bearer ${HTTPBearer}`)

const url = `${baseUrl.replace(/\/+$/, '')}/knowledge/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(paginatedResponseVectorSearchResult, await res.json())
};