import {z} from 'zod'

export type CreateApiV1CheckoutArgs = {body: {locale?: ('nl' | 'fr') | undefined, selection: Array<{energyType: 'ELECTRICITY' | 'GAS', productVersionId: string}>, context: {meterType?: ('Digital' | 'Analog' | null) | undefined, currentMerchants?: ({electricity?: (string | null) | undefined, gas?: (string | null) | undefined}) | undefined}, intake: {supplyPoint: {postalCode: string, city: string, residential?: boolean | undefined, meterType?: ('Digital' | 'Analog' | null) | undefined, tariffType?: ('enkelvoudig' | 'tweevoudig' | 'nachtmeter' | null) | undefined, hasExclusiveNightRegister?: boolean | undefined}, consumption?: ({electricity?: ({consumptionTotalKwh: number, consumptionDayKwh?: (number | null) | undefined, consumptionNightKwh?: (number | null) | undefined, injectionTotalKwh?: (number | null) | undefined, injectionDayKwh?: (number | null) | undefined, injectionNightKwh?: (number | null) | undefined, peakConsumptionKw?: (number | null) | undefined, consumptionExclusiveNightKwh?: (number | null) | undefined} | null) | undefined, gas?: ({consumptionTotalKwh: number} | null) | undefined}) | undefined, referenceCost?: ({electricity?: ({yearlyInclVat?: (number | null) | undefined, currentMerchant?: (string | null) | undefined, currentProduct?: (string | null) | undefined} | null) | undefined, gas?: ({yearlyInclVat?: (number | null) | undefined, currentMerchant?: (string | null) | undefined, currentProduct?: (string | null) | undefined} | null) | undefined}) | undefined}, customer: {firstName: string, lastName: string, email: string, mobilePhone: string, address: string, iban: string}, eans?: ({electricity?: (string | null) | undefined, gas?: (string | null) | undefined}) | undefined, paymentMethod: 'DIRECT_DEBIT' | 'BANK_TRANSFER', billingPreference: 'ADVANCE_INVOICE' | 'MONTHLY_SETTLEMENT', contractStartDate: string | string, consentGiven: true, consentGivenAt: string | string}};

export type CreateApiV1CheckoutOptions = {baseUrl?: string | undefined, apiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const submittedCheckout = z.object({checkoutId: z.string(), boltHandoffAuthorized: z.boolean(), submissionIds: z.array(z.string()), submissionMethods: z.array(z.object({energyType: z.enum(["ELECTRICITY", "GAS"]), submissionMethod: z.enum(["MANUAL", "REDIRECT", "INTEGRATION"]), urlHandoffAuthorized: z.boolean()}))});

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
};

/**
 * Submit a selection Vwala will switch on the customer's behalf
 * 
 * POST /v1/checkout
 */
export const createApiV1Checkout = async (args: CreateApiV1CheckoutArgs, options?: CreateApiV1CheckoutOptions) => {
const {baseUrl = "https://open-energie.api.vwala.be", fetch: fetchFn = fetch, apiKey} = options ?? {}

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

if (apiKey !== undefined) headers.set("x-api-key", apiKey)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/checkout${query.size > 0 ? `?${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(submittedCheckout, await res.json())
};