import {z} from 'zod'

export type GetApiV1GoogleTrendsInterestArgs = {q: string, geo?: string | undefined, date?: string | undefined, category?: number | undefined, gprop?: string | undefined};

export type GetApiV1GoogleTrendsInterestOptions = {baseUrl?: string | undefined, apiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const trendsTimelineValue = z.object({query: z.string(), value: z.number().int(), extracted_value: z.number().int().nullable().optional()});

export const trendsTimelinePoint = z.object({date: z.string(), timestamp: z.number().int().nullable().optional(), values: z.array(trendsTimelineValue).optional()});

export const trendsInterestResponse = z.object({timeline: z.array(trendsTimelinePoint).optional(), averages: z.array(trendsTimelineValue).optional(), query: z.string()});

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
};

/**
 * Interest over time
 * 
 * GET /v1/google/trends/interest
 */
export const getApiV1GoogleTrendsInterest = async (args: GetApiV1GoogleTrendsInterestArgs, options?: GetApiV1GoogleTrendsInterestOptions) => {
const {baseUrl = "https://scrapebadger.com", fetch: fetchFn = fetch, apiKey} = options ?? {}

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

if (args.q != null) query.append("q", String(args.q))
if (args.geo != null) query.append("geo", String(args.geo))
if (args.date != null) query.append("date", String(args.date))
if (args.category != null) query.append("category", String(args.category))
if (args.gprop != null) query.append("gprop", String(args.gprop))
if (apiKey !== undefined) headers.set("x-api-key", apiKey)

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