import {z} from 'zod'

export type GetApiSectionFormatArgs = {section: 'home' | 'opinion' | 'world' | 'national' | 'politics' | 'upshot' | 'nyregion' | 'business' | 'technology' | 'science' | 'health' | 'sports' | 'arts' | 'books' | 'movies' | 'theater' | 'sundayreview' | 'fashion' | 'tmagazine' | 'food' | 'travel' | 'magazine' | 'realestate' | 'automobiles' | 'obituaries' | 'insider', format: 'json' | 'jsonp', callback?: string | undefined};

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

export const article = z.object({section: z.string().optional(), subsection: z.string().optional(), title: z.string().optional(), abstract: z.string().optional(), url: z.string().optional(), thumbnail_standard: z.string().optional(), short_url: z.string().optional(), byline: z.string().optional(), item_type: z.string().optional(), updated_date: z.string().optional(), created_date: z.string().optional(), published_date: z.string().optional(), material_type_facet: z.string().optional(), kicker: z.string().optional(), des_facet: z.array(z.string()).optional(), org_facet: z.array(z.string()).optional(), per_facet: z.array(z.string()).optional(), geo_facet: z.array(z.string()).optional(), multimedia: z.array(z.object({url: z.string().optional(), format: z.string().optional(), height: z.number().int().optional(), width: z.number().int().optional(), type: z.string().optional(), subtype: z.string().optional(), caption: z.string().optional(), copyright: z.string().optional()})).optional(), related_urls: z.array(z.object({suggested_link_text: z.string().optional(), url: z.string().optional()})).optional()});

export const getApiSectionFormatResponse = z.object({results: z.array(article).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
};

/**
 * Top Stories
 * 
 * GET /{section}.{format}
 */
export const getApiSectionFormat = async (args: GetApiSectionFormatArgs, options?: GetApiSectionFormatOptions) => {
const {baseUrl = "http://api.nytimes.com/svc/topstories/v2", fetch: fetchFn = fetch, apikey} = options ?? {}

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

if (args.callback != null) query.append("callback", String(args.callback))
if (apikey !== undefined) query.set("api-key", apikey)

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

const res = await fetchFn(url, {method: "GET", headers})

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

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