import {z} from 'zod'

export type CategoriseTransactionsPost = {accountType?: ('cash' | 'card' | 'savings' | 'pension' | 'investment') | undefined, accountId?: string | undefined, transactions: Array<{id?: string | undefined, description: string, amount: {value: number}, date: string, proprietaryTransactionCode?: string | undefined, merchantCategoryCode?: string | undefined}>};

export type CreateApiCategoriseTransactionsArgs = {body: CategoriseTransactionsPost};

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

export const categoriseTransactions = z.object({accountType: z.enum(["cash", "card", "savings", "pension", "investment"]), accountId: z.string().max(64), transactions: z.array(z.object({id: z.string().max(64), description: z.string().max(512), categoryId: z.string().optional(), counterpartyId: z.string().optional(), amount: z.object({value: z.number().int()}), date: z.string(), proprietaryTransactionCode: z.string().max(64).optional(), merchantCategoryCode: z.string().max(4).optional()})), failedCategorisationIds: z.array(z.string())});

export const links = z.object({next: z.string().optional(), prev: z.string().optional(), self: z.string()});

export const createApiCategoriseTransactionsResponse = z.object({data: categoriseTransactions.optional(), links: links.optional(), meta: z.object({}).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
};

/**
 * Categorises a given set of transactions
 * 
 * POST /categorise-transactions
 */
export const createApiCategoriseTransactions = async (args: CreateApiCategoriseTransactionsArgs, options?: CreateApiCategoriseTransactionsOptions) => {
const {baseUrl = "https://api.moneyhub.co.uk/v2.0", fetch: fetchFn = fetch, Bearer} = options ?? {}

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

if (Bearer !== undefined) headers.set("Authorization", Bearer)

const url = `${baseUrl.replace(/\/+$/, '')}/categorise-transactions${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(createApiCategoriseTransactionsResponse, await res.json())
};