import {z} from 'zod'

export type ScrapeFormat = 'markdown' | 'html' | 'rawHtml' | 'links' | 'screenshot' | 'screenshot@fullPage' | 'json' | {type: 'json', schema?: Record<string, never> | undefined, prompt?: string | undefined};

export type ScrapeOptions = {formats?: Array<ScrapeFormat> | undefined, onlyMainContent?: boolean | undefined, waitFor?: number | undefined, timeout?: number | undefined};

export type CreateApiV1CrawlArgs = {body: {url: string, limit?: number | undefined, maxDepth?: number | undefined, includePaths?: Array<string> | undefined, excludePaths?: Array<string> | undefined, scrapeOptions?: ScrapeOptions | undefined}};

export type CreateApiV1CrawlOptions = {baseUrl?: string | undefined, BearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const scrapeJobStarted = z.object({success: z.boolean().optional(), id: z.string().optional(), url: z.string().optional()});

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
};

/**
 * Start an asynchronous same-site crawl
 * 
 * POST /v1/crawl
 * 
 * Also accepts auth: ApiKeyHeader, ApiKeyQuery
 */
export const createApiV1Crawl = async (args: CreateApiV1CrawlArgs, options?: CreateApiV1CrawlOptions) => {
const {baseUrl = "https://search.elixpo.com", fetch: fetchFn = fetch, BearerAuth} = options ?? {}

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

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

const url = `${baseUrl.replace(/\/+$/, '')}/v1/crawl${query.size > 0 ? `?${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(scrapeJobStarted, await res.json())
};