import {z} from 'zod'

export type GetApiSearchArgs = {q: string, c?: string | undefined, modifier?: string | undefined, limit?: number | undefined};

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

export const currency = z.object({id: z.string().optional(), name: z.string().optional(), symbol: z.string().optional(), rank: z.number().int().optional(), is_new: z.boolean().optional(), is_active: z.boolean().optional(), type: z.string().optional()});

export const icoProject = z.object({id: z.string().optional(), name: z.string().optional(), symbol: z.string().optional(), is_new: z.boolean().optional()});

export const exchangeSimplified = z.object({id: z.string().optional(), name: z.string().optional(), rank: z.number().int().optional()});

export const person = z.object({id: z.string().optional(), name: z.string().optional(), teams_count: z.number().int().optional()});

export const tagSimplified = z.object({id: z.string().optional(), name: z.string().optional(), coin_counter: z.number().int().optional(), ico_counter: z.number().int().optional()});

export const searchResults = z.object({currencies: z.array(currency).optional(), icos: z.array(icoProject).optional(), exchanges: z.array(exchangeSimplified).optional(), people: z.array(person).optional(), tags: z.array(tagSimplified).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
};

/**
 * Search
 * 
 * GET /search
 */
export const getApiSearch = async (args: GetApiSearchArgs, options?: GetApiSearchOptions) => {
const {baseUrl = "https://api.coinpaprika.com/v1", fetch: fetchFn = fetch} = 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.c != null) query.append("c", String(args.c))
if (args.modifier != null) query.append("modifier", String(args.modifier))
if (args.limit != null) query.append("limit", String(args.limit))

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(searchResults, await res.json())
};