import {z} from 'zod'

export type GetApiSearchArgs = {q?: string | undefined};

export type GetApiSearchOptions = {baseUrl?: string | undefined, bearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const searchResultToken = z.object({address_hash: z.string().optional(), address_url: z.string(), exchange_rate: z.string(), icon_url: z.string(), is_smart_contract_verified: z.boolean(), name: z.string(), symbol: z.string(), token_type: z.string(), token_url: z.string(), total_supply: z.string(), type: z.string()});

export const searchResultAddressOrContract = z.object({address_hash: z.string().optional(), is_smart_contract_verified: z.boolean(), name: z.string(), type: z.string(), url: z.string()});

export const searchResultBlock = z.object({block_hash: z.string(), block_number: z.number().int(), timestamp: z.string(), type: z.string(), url: z.string()});

export const searchResultTransaction = z.object({timestamp: z.string(), transaction_hash: z.string(), type: z.string(), url: z.string()});

export const getApiSearchResponse = z.object({items: z.array(z.union([searchResultToken, searchResultAddressOrContract, searchResultBlock, searchResultTransaction])), next_page_params: z.object({})});

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
 * 
 * GET /search
 * 
 * Also accepts auth: apiKeyAuth
 */
export const getApiSearch = async (args: GetApiSearchArgs, options?: GetApiSearchOptions) => {
const {baseUrl = "https://api.blockscout.com", fetch: fetchFn = fetch, bearerAuth} = 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 (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

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