import {z} from 'zod'

export type ISO4217SupportedCurrency = 'EUR' | 'GBP' | 'USD';

export type GetApiBusinessV2StatementsArgs = {year: Array<number>, currency: ISO4217SupportedCurrency};

export type GetApiBusinessV2StatementsOptions = {baseUrl?: string | undefined, standardAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const month = z.enum(["JANUARY", "FEBRUARY", "MARCH", "APRIL", "MAY", "JUNE", "JULY", "AUGUST", "SEPTEMBER", "OCTOBER", "NOVEMBER", "DECEMBER"]);

export const iSO4217SupportedCurrency = z.enum(["EUR", "GBP", "USD"]);

export const statement = z.object({year: z.number().int().optional(), month: month.optional(), currency: iSO4217SupportedCurrency.optional(), file_types: z.array(z.string()).optional()});

export const statements = z.object({total: z.number().int().optional(), results: z.array(statement).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 Statements
 * 
 * GET /business/v2/statements
 */
export const getApiBusinessV2Statements = async (args: GetApiBusinessV2StatementsArgs, options?: GetApiBusinessV2StatementsOptions) => {
const {baseUrl = "https://api.soldo.com", fetch: fetchFn = fetch, standardAuth} = options ?? {}

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

for (const item of args.year ?? []) query.append("year", String(item))
if (args.currency != null) query.append("currency", String(args.currency))
if (standardAuth !== undefined) headers.set('authorization', `Bearer ${standardAuth}`)

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