import {z} from 'zod'

export type GetApiV2TechnologiesArgs = {page?: number | undefined, search?: string | undefined, size?: number | undefined};

export type GetApiV2TechnologiesOptions = {baseUrl?: string | undefined, apiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const paginationMeta = z.object({cost: z.number(), credits: z.number(), currentPage: z.number(), firstPage: z.number(), freeRequest: z.boolean(), lastPage: z.number(), maxScrollResultsReached: z.boolean().optional(), perPage: z.number(), total: z.number()});

export const technology = z.object({categories: z.array(z.string()).nullable().optional(), companiesCount: z.number().nullable(), createdAt: z.string().nullable().optional(), editor: z.string(), free: z.boolean().nullable(), id: z.number(), name: z.string(), nameSynonyms: z.array(z.string()).nullable(), paid: z.boolean().nullable(), slug: z.string(), updatedAt: z.string().nullable(), usageCount: z.number().nullable(), websiteUrl: z.string().nullable()});

export const getApiV2TechnologiesResponse = z.object({meta: paginationMeta, technologies: z.array(technology)});

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 technologies.
 * 
 * GET /v2/technologies
 */
export const getApiV2Technologies = async (args: GetApiV2TechnologiesArgs, options?: GetApiV2TechnologiesOptions) => {
const {baseUrl = "https://api.thecompaniesapi.com", fetch: fetchFn = fetch, apiKey} = options ?? {}

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

if (args.page != null) query.append("page", String(args.page))
if (args.search != null) query.append("search", String(args.search))
if (args.size != null) query.append("size", String(args.size))
if (apiKey !== undefined) headers.set("Authorization", apiKey)

const url = `${baseUrl.replace(/\/+$/, '')}/v2/technologies${query.size > 0 ? `?${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(getApiV2TechnologiesResponse, await res.json())
};